2024/07/17 更新

写真a

ホソカワ シゲオ
細川 茂雄
HOSOKAWA,Shigeo
所属
社会安全学部 教授
職名
教授
外部リンク

学位

  • 博士(工学) ( 神戸大学 )

  • 工学修士 ( 神戸大学 )

研究キーワード

  • 流体計測

  • 混相流工学

  • 流体工学

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 流体工学

学歴

  • 神戸大学 大学院自然科学研究科修了

    - 1993年3月

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所属学協会

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論文

  • Velocity field characterization of single-phase flows across a tube bundle through spatial filter velocimetry

    Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

    Experimental Thermal and Fluid Science   147   110947 - 110947   2023年9月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.expthermflusci.2023.110947

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  • Effects of microbubbles on removal of viscous oil adhering to channel wall

    Yuegui Li, Kosuke Hayashi, Fuyuki Okamoto, Shigeo Hosokawa, Akio Tomiyama

    Chemical Engineering Research and Design   193   75 - 84   2023年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.cherd.2023.03.020

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  • Numerical Prediction of Size Distribution of Microbubbles in Water with Mass Transfer

    Yuegui Li, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama, Yasunari Maeda

    Multiphase Science and Technology   2023年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Begell House  

    DOI: 10.1615/multscientechn.2023050883

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  • Profiles of Temperature and Steam Mass Fraction in Flows of Saturated Steam-Air Mixtures

    Michio MURASE, Yoichi UTANOHARA, Shigeo HOSOKAWA, Akio TOMIYAMA

    JAPANESE JOURNAL OF MULTIPHASE FLOW   36 ( 2 )   255 - 265   2022年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japanese Society for Multiphase Flow  

    DOI: 10.3811/jjmf.2022.014

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  • Single Contaminated Drops Falling through Stagnant Liquid at Low Reynolds Numbers

    Kosuke Hayashi, Yuya Motoki, Matheus J. A. van der Linden, Niels G. Deen, Shigeo Hosokawa, Akio Tomiyama

    Fluids   7 ( 2 )   55 - 55   2022年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    Numerical simulations of contaminated spherical drops falling through a stagnant liquid at low Reynolds numbers are carried out using the finite difference method. The numerical results are used to describe the behavior of the surfactant concentrations and to understand the surfactant effects on the fluid motions in detail. The predicted interfacial surfactant concentration, Γ, is almost zero for angles, θ, below a certain value (the stagnant-cap angle, θcap), whereas it steeply increases and reaches a large value for θ>θcap (the stagnant-cap region). The increase in the initial surfactant concentration, C0, in the drop enhances the adsorption from the drop to the interface, which results in the increase in Γ and the decrease in θcap. Peaks appear in the predicted Marangoni stresses around θcap, which causes similar peaks in the pressure distribution. The high-pressure spots prevent the fluid motion along the interface, which results in the formation of the stagnant-cap region and the attenuation of the tangential velocity in the continuous phase. The surfactant flux from the bulk to the interface decreases C in the vicinity of the interface for θ<θcap and the weak diffusion cannot compensate for the reduction in C by adsorption, which results in C at the interface smaller than C0. The pattern of the low C region is determined by the advection and does not smear out because of a small diffusive flux.

    DOI: 10.3390/fluids7020055

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  • Condensation heat transfer for downward flows of superheated steam-air mixture in a circular pipe

    Michio Murase, Yoichi Utanohara, Raito Goda, Shigeo Hosokawa, Akio Tomiyama

    Nuclear Engineering and Design   371   2021年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    We measured the radial and axial temperature distributions of a saturated steam-air mixture in a vertical circular pipe (diameter, 49.5 mm
    cooling height, 610 mm) in our previous study. Those of a superheated steam-air mixture in the same experimental setup were measured in this study. The condensation heat flux qc and heat transfer coefficient hc for the superheated mixture were evaluated, and they were compared with those for the saturated mixture. There was no large difference in qc between the saturated and superheated mixtures. The heat transfer coefficient hc (which was evaluated for the saturation temperature) for the superheated mixture agreed with that for the saturated mixture. hc computed with the diffusion layer model for saturated temperature agreed well with the hc measured for the superheated mixture.

    DOI: 10.1016/j.nucengdes.2020.110948

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  • GENERATION OF MICROBUBBLES BY SUBCOOLED BOILING OF WATER WITH DISSOLVED INCONDENSABLE GASES

    Yuegui Li, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama, Naoki Shibata, Yasunari Maeda

    Multiphase Science and Technology   33 ( 3 )   17 - 31   2021年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Begell House  

    DOI: 10.1615/multscientechn.2021040158

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  • A Comparison of the Flow Structure in a Normal Triangular Tube Array Obtained Based on the SFV Technique and on a CFD Analysis

    Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

    Volume 1: Fluid Applications and Systems; Fluid Measurement and Instrumentation   2020年7月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:American Society of Mechanical Engineers  

    Abstract

    This paper presents an analysis of the performance of the Spatial Filter Velocimetry (SFV) technique applied to external flows across tube bundles to evaluate the benefits of using low particle concentration in a complex geometry. The experimental vector velocity fields were obtained in a tube bundle test section made of acrylic with 20 rows of 4 tubes of 20mm O.D. mounted in a normal triangular configuration and transversal pitch per diameter ratio of 1.25. The SFV results reliability was evaluated by comparing the volumetric flow rates estimated by the experimental vector velocity fields with the volumetric flow rates measured by the flowmeter, showing good agreement. Additionally, the experimental results are used to check the validity of numerical results obtained through CFD simulation. The experiments were conducted for Reynolds numbers of 909, 1842 and 3902. The velocity profiles obtained through the SFV technique agree with the CFD simulations results, which indicate consistent results for both analyzes. Therefore, the numerical and experimental results indicate that the SFV technique provides accurate velocity data and is suitable to be applied to complex geometries, especially in regions away of the test section wall due to the good visibility provided by low particle concentration.

    DOI: 10.1115/fedsm2020-20251

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  • Characterization of the Velocity Field External to a Tube Bundle Using Spatial Filter Velocimetry Based on Variable Meshing Scheme 査読

    Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

    Flow, Turbulence and Combustion   2020年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10494-020-00143-z

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    その他リンク: http://link.springer.com/article/10.1007/s10494-020-00143-z/fulltext.html

  • Pressure and shear stress analysis in a normal triangular tube bundle based on experimental flow velocity field 査読

    Douglas Martins Rocha, Fabio Toshio Kanizawa, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Gherhardt Ribatski

    Journal of the Brazilian Society of Mechanical Sciences and Engineering   42 ( 4 )   2020年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s40430-020-02293-7

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    その他リンク: http://link.springer.com/article/10.1007/s40430-020-02293-7/fulltext.html

  • Mass transfer from single carbon-dioxide bubbles in surfactant-electrolyte mixed aqueous solutions in vertical pipes 査読

    Yohei Hori, Dieter Bothe, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    International Journal of Multiphase Flow   124   103207 - 103207   2020年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.ijmultiphaseflow.2020.103207

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  • Measurements of Temperature Distributions and Condensation Heat Fluxes for Downward Flows of Steam-Air Mixture in a Circular Pipe 査読

    Michio Murase, Yoichi Utanohara, Raito Goda, Takeyuki Shimamura, Shigeo Hosokawa, Akio Tomiyama

    混相流   33 ( 4 )   405 - 416   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    DOI: 10.3811/jjmf.2019.012

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  • Generation of Micro-Bubbles from a Heated Thin Wire 査読

    Yuegui Li, Shigeo Hosokawa, Akio Tomiyama, Yasunari Maeda

    11th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF)   2019年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Experimental Study on Interfacial and Wall Friction Factors under Counter-Current Flow Limitation in Vertical Pipes with Sharp-Edged Lower Ends 査読

    GODA RAITO, HAYASHI KOSUKE, MURASE MICHIO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Nuclear Engineering and Design   353   110223   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.nucengdes.2019.110223

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  • Application of Spatiotemporal Filter Velocimetry to Evaluation of Drag Force Acting on Single Drop 査読

    Gaku Shigekane, Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama

    11th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF)   2019年11月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Drag Correlations of Ellipsoidal Bubbles in Clean and Fully-Contaminated Systems 査読

    CHEN JUNMING, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Multiphase Science and Technology   31 ( 3 )   215 - 234   2019年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1615/MultScienTechn.2019031210

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  • Characterization of Velocity Field External to Tube Bundle Using Spatial Filter Velocimetry based on Variable Meshing Scheme 査読

    ROCHA DOUGLAS, KANIZAWA FABIO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, RIBATSKI GHERHARDT

    10th International Conference on Multiphase Flow (ICMF2019)   9 pages   2019年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Viscous Stress and Pressure Acting on Interface of Contaminated Drop 査読

    HOSOKAWA SHIGEO, SHIGEKANE GAKU, HAYASHI KOSUKE, TOMIYAMA AKIO

    10th International Conference on Multiphase Flow (ICMF2019)   2 pages   2019年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Combined Effects of Surfactant and Electrolyte on Mass Transfer from Single Carbon-Dioxide Bubbles in Vertical Pipes 査読

    HORI YOHEI, BOTHE DIETER, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    10th International Conference on Multiphase Flow (ICMF2019)   9 pages   2019年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effects of Surfactant on Bubble Breakup at T-Junction and Characteristics of Taylor Flows in Mini and Micro Channels 査読

    HAYASHI KOSUKE, SUZUKI DAIKI, KURIMOTO RYO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    10th International Conference on Multiphase Flow (ICMF2019)   2 pages   2019年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Hydrodynamic Sound Generated by Bubble Collapse in Subcooled Liquid Flow 査読

    HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Multiphase Science and Technology   31 ( 1 )   61 - 71   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1615/MultScienTechn.2019029476

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  • Shapes of single bubbles in infinite stagnant liquids contaminated with surfactant 査読

    Shohei Aoyama, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    Experimental Thermal and Fluid Science   96   460 - 469   2018年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Inc.  

    Aspect ratios of ellipsoidal bubbles in clean and contaminated systems were measured to investigate the effects of surfactant on the bubble aspect ratio. The bubble diameter ranged from 0.80 to 5.8 mm. Air was used for the gas phase and the glycerol-water solutions were used for the liquid phase. The experimental ranges of the Morton number, M, the bubble Reynolds number, Re, the Eötvös number, Eo, the Weber number, We, and the Tadaki number, Ta, were as follows: 10−7 &lt
    M &lt
    10−3, 3.6 × 10−1 &lt
    Re &lt
    1.7 × 102, 1.1 × 10−1 &lt
    Eo &lt
    5.9, 5.0 × 10−3 &lt
    We &lt
    3.7 and 5.3 × 10−2 &lt
    Ta &lt
    3.6. Triton X-100 and 1-octanol were used for surfactant. The terminal velocities of bubbles were confirmed to be independent of the surfactant concentration, and therefore, the bubbles were fully-contaminated from the point of view of the terminal velocity. By making use of the aspect ratio data, the applicability of available aspect ratio correlations was examined and an empirical correlation was proposed. The applicability of the proposed correlation was also examined for sodium dodecyl sulphate (SDS) and 1-decanol. As a result, the following conclusions were obtained: (1) the aspect ratio database, which is of use for validating and developing shape correlations, was obtained, (2) the available aspect ratio correlations are not applicable to the present data for fully-contaminated ellipsoidal bubbles, (3) the aspect ratios are well correlated in terms of a combination of the Eötvös and bubble Reynolds numbers, which proves that all the relevant forces, i.e. the viscous, inertial, buoyant and surface tension forces, should be taken into account to correlate bubble shapes, and (4) the empirical correlation of the aspect ratio developed by using the Triton X-100 and 1-octanol data also gives good evaluations for bubbles contaminated with SDS and 1-decanol in spite of largely different adsorption-desorption characteristics.

    DOI: 10.1016/j.expthermflusci.2018.03.015

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  • Measurement of flow velocities of colloidal particles near solid-liquid boundary using interference of evanescent waves 査読

    SHIRAI Katsuaki, KAJI Shoichiro, HOSOKAWA SHIGEO, KAWANAMI Tsuyoshi, HIRASAWA Shigeaki

    12th European Fluid Mechanics Conference   2 - 4   2018年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Adsorption of Surfactant at a Moving Interface of a Single Spherical Drop 査読

    HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

    Experimental Thermal and Fluid Science   96   397 - 405   2018年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

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  • Measurement of kinetic behaviour of colloidal particles in the vicinity of Solid-liquid interfacial boundary using interference of evanescent wave 査読

    SHIRAI Katsuaki, KAJI Shoichiro, HOSOKAWA SHIGEO, KAWANAMI Tsuyoshi, HIRASAWA Shigeaki

    32nd Conference of the European Colloid and Interface Society   PP4.13   2018年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Diagnostics of flow about a contaminated single drop using spatiotemporal filter velocimetry 査読

    HOSOKAWA SHIGEO, SHIGEKANE GAKU, HAYASHI KOSUKE, TOMIYAMA AKIO

    19th Symposium on Applications of Laser and Imaging Techniques to Fluid Mechanics, Lisbon 2016   2018年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Interfacial and wall friction factors of swirling annular flow in a vertical pipe 査読

    H. Funahashi, K. Vierow Kirkland, K. Hayashi, S. Hosokawa, A. Tomiyama

    Nuclear Engineering and Design   330   97 - 105   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    Experiments on air–water two-phase swirling annular flows in a vertical pipe of 40 mm diameter were carried out at atmospheric pressure and room temperature to investigate interfacial and wall friction factors, fi and fw. The friction factors were evaluated using measured pressure drops and void fractions. Measurements of liquid film thickness and flow observation were also conducted. The ranges of the gas and liquid volume fluxes, JG and JL, were 12.5 ≤ JG ≤ 20.0 m/s and 0.03 ≤ JL ≤ 0.11 m/s, respectively. The main conclusions obtained are as follows: (1) fi and fw in swirling annular flows are several times larger than those in non-swirling flows, (2) fi is well correlated in terms of the liquid volume fraction and the gas Reynolds number, ReG, (3) ReG and the liquid Reynolds number, ReL, are required for correlating fw, and (4) the liquid film thicknesses in two-phase swirling flows in a one-fifth model of a BWR separator are well predicted using the two-fluid model and the correlations of fi and fw developed based on the experimental data.

    DOI: 10.1016/j.nucengdes.2018.01.043

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  • Generation of Micro-bubbles from a heated thin wire 査読

    HOSOKAWA SHIGEO, YOSHIDA MASATAKA, TOMIYAMA AKIO, AKITA TOMOHIRO, MAEDA YASUNARI

    8th European-Japanese Two-Phase Flow Group Meeting   2018年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Numerical Simulation of a Drop in Contaminated Systems from low concentration to CMC 査読

    HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    8th European-Japanese Twp-Phase Flow Group Meeting, EJTPFGM-8   1   2018年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Wall and Interfacial Shear Stress of Swirling Annular Flow 査読

    FUNAHASHI HAYATO, 林 公祐, 細川 茂雄, 冨山 明男

    8th European-Japanese Twp-Phase Flow Group Meeting, EJTPFGM-8   1   2018年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Experimental evaluation of Marangoni stress and surfactant concentration at interface of contaminated single spherical drop using spatiotemporal filter velocimetry 査読

    Shigeo Hosokawa, Yuya Masukura, Kosuke Hayashi, Akio Tomiyama

    International Journal of Multiphase Flow   97   157 - 167   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    Spatiotemporal filter velocimetry (SFV) was extended to Lagrangian measurements with boundary-fitted measurement areas, and was applied to flows about single spherical drops of glycerol-water solution falling in stagnant silicon oil under clean and contaminated conditions to examine its applicability to the estimation of the Marangoni stress and surfactant concentration at a moving interface. Effects of bulk concentration of surfactant on the velocity field, the Marangoni stress and the surface concentration of surfactant were discussed from the measured data. As a result, we confirmed that accurate velocity distribution in the vicinity of the interface measured by SFV enables us to evaluate interfacial velocity and interfacial shear stresses and to estimate the Marangoni stress, interfacial tension and surfactant concentration at the interface with the assumption of negligible surface viscosity. The flow inside the drop and the interfacial velocity become weak due to the Marangoni stress caused by the gradient of surfactant concentration at the interface as the bulk concentration of surfactant increases. These results demonstrate that SFV is of great use in experimental analysis of adsorption and desorption kinetics at a moving interface.

    DOI: 10.1016/j.ijmultiphaseflow.2017.08.007

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  • Turbulent property of air-water bubbly flow in a 2X2 rod bundle 査読

    HOSOKAWA SHIGEO, TOMIYAMA AKIO

    10th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF2017)   2017年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Adsorption of Surfactant at a Drop Interface using Spatiotemporal Filter Velocimetry 査読

    HOSOKAWA SHIGEO, OKAMOTO RYOTA, HAYASHI KOSUKE, TOMIYAMA AKIO

    10th International Symposium on Measurement Techniques for Multiphase Flow (ISMTMF2017)   2017年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Mass transfer from single carbon-dioxide bubbles in electrolyte aqueous solutions in vertical pipes 査読

    Yohei Hori, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   115   663 - 671   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Mass transfer rates, k(L), of single carbon-dioxide (CO2) bubbles rising through vertical pipes filled with electrolyte aqueous solutions were measured to investigate the effects of the presence of electrolyte on k(L) Sodium chloride (NaCI) was used for electrolyte and its concentration was varied from 3.5 to 14 wt.%. The pipe diameters, D, were 12.5, 18.2 and 25.0 mm and the bubble diameter, d, ranged from 5 to 25 mm. The diameter ratio, lambda(= d/D), was varied from 0.2 to 1.7, to cover various bubble shapes, i.e. ellipsoidal, cap, semi-Taylor bubbles and Taylor bubbles. The conclusions obtained are as follows: (1) k(L) in the NaCI aqueous solutions decreases with increasing the NaCI concentration mainly due to the reduction of the diffusion coefficient of CO2 in the liquid phase, (2) the Sherwood numbers, Sh, of Taylor bubbles of L/D > 1 in the NaCI aqueous solutions can be well evaluated using the available Sherwood number correlation for clean Taylor bubbles, where L is the length of a Taylor bubble, (3) Sh of ellipsoidal, cap, semi-Taylor bubbles and Taylor bubbles of LID <= 1 in the clean water and NaCI aqueous solutions can be well correlated in terms of the Peclet number and the dimensionless bubble diameter d* = d/d(T), where d(T) is the bubble diameter at the transition from the ellipsoidal-cap bubble regime to the semi-Taylor bubble regime, and (4) the Sh correlations give good predictions for long-term bubble dissolution processes in NaCI aqueous solutions. (c) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2017.07.087

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  • Spatiotemporal Flow Structure of Counter-Current Two-Phase Annular Flows 査読

    GODA RAITO, KATSUYA MORI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    ANS Winter Meeting and Nuclear Technology Expo   2 pages   2017年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Lift force acting on single bubbles in linear shear flows 査読

    S. Aoyama, K. Hayashi, S. Hosokawa, D. Lucas, A. Tomiyama

    INTERNATIONAL JOURNAL OF MULTIPHASE FLOW   96   113 - 122   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Lift coefficients, C-L, of single bubbles in linear shear flows are measured to investigate effects of the bubble shape, the liquid velocity gradient and the fluid property on C-L. The range of the Morton number, M, tested is from logM = -6.6 to -3.2. The shapes of bubbles are spherical and ellipsoidal. A correlation of bubble aspect ratio for single bubbles in infinite stagnant liquids proposed in our previous study can give good evaluations for bubbles in the linear shear flows. The C-L of spherical bubbles at low bubble Reynolds numbers, Re, depend on the dimensionless shear rate Sr and Re and decrease with increasing Re. These characteristics agree with the Legendre-Magnaudet correlation. The use of a single dimensionless group such as Re, the Eotvos number, the Weber number and the Capillary number cannot correlate C-L of non-spherical bubbles. The trend of the critical Re for the reversal of the sign of C-L is the same as that for the onset of oscillation of bubble motion, which supports the mechanism proposed by Adoua et al., at least within the range of -6.6 <= logM <= -3.2. An experimental database of C-L is provided for validation of available C-L models and CFD. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijmultiphaseflow.2017.07.003

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  • Improvement of separator performance with modified pick-off ring and swirler 査読

    H. Funahashi, K. Hayashi, S. Hosokawa, A. Tomiyama

    NUCLEAR ENGINEERING AND DESIGN   322   360 - 367   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The swirler and the 1st pick-off ring (POR) of a gas-liquid separator are improved to reduce the pressure drop, DPT, in the separator while keeping the flow rate of separated liquid, WST, high. Two swirler designs are presented, i.e. V8 (swirler with eight vanes) and V6 (swirler with six vanes), whose diameters of the hubs supporting the vanes are smaller than that of the normal swirler, N8, and the nose shape of vanes are coned. The swirlers are installed into a one-fifth scale separator with three PORs. The gap width of the 1st POR is reduced to the value of the liquid film thickness in the barrel of the separator and the rear shape of the 1st POR is smoothed. The performance of the downscaled separator with the proposed swirlers and the 1st POR are evaluated under the nominal operating condition of the Hyper BWR and a higher quality condition. As a result, the following conclusions are obtained in the present experimental range: (1) DPT in the separator is reduced by 23% using V8, and V8 gives the same WST as N8, confirming that the decrease in the hub diameter and the coned-nose shape of vanes are effective, (2) V6 can realize further reduction of DPT (38%) without deteriorating the liquid-separation rate, (3) the reduced gap width of the 1st POR and a tapered shape of the downstream side of the 1st POR are also effective to decrease the pressure drop, i.e. the improved POR decreases DPT by 42% and 54% by combining with V8 and V6, respectively, and (4) the improved separators also show good performances in DPT and WST at the higher quality condition. (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nucengdes.2017.07.002

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  • 鉛直管での気液対向流制限に対する流体物性の影響 査読

    村瀬 道雄, 楠木 貴世志, 山本 泰功, 合田 頼人, 林 公祐, 細川 茂雄, 冨山 明男

    混相流   31 ( 2 )   152 - 161   2017年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Evaluation of Adsorption of Surfactant at a Moving Interface of a Single Spherical Drop 査読

    HOSOKAWA SHIGEO, OKAMOTO RYOTA, HAYASHI KOSUKE, TOMIYAMA AKIO

    9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamic (ExHFT-9)   10 pages   2017年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 鉛直管内での気液対向流に対する界面摩擦係数 査読

    楠木 貴世志, 山本 泰功, 村瀬 道雄, 林 公祐, 細川 茂雄, 冨山 明男

    混相流   31 ( 1 )   37 - 46   2017年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    <p>One-region computations with the annular flow model were done for counter-current flow limitation (CCFL) at the sharp-edged lower end of vertical pipes to evaluate effects of diameters and fluid properties on CCFL characteristics. CCFL characteristics computed with several correlations for interfacial friction factors were compared with CCFL data and the correlation proposed by Bharathan et al. (which is a function of void fraction) was selected. The adjustment factors were obtained to give good agreement between CCFL characteristics computed with the correlation by Bharathan et al. and CCFL data and were correlated with the viscosity ratio of gas and liquid phases and the dimensionless diameter. By using the correlation for interfacial friction factors by Bharathan et al. modified with the viscosity ratio of gas and liquid phases and the dimensionless diameter, effects of diameters and fluid properties on CCFL characteristics were computed.</p>

    DOI: 10.3811/jjmf.31.37

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  • Pressure Drop in Air-Water Two-Phase Flows in Horizontal U-Bends 査読

    HAYASHI KOSUKE, SUZUKI DAIKI, MIYACHI NAOTO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamic (ExHFT-9)   8 pages   2017年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Mass transfer from single carbon dioxide bubbles in alcohol aqueous solutions in vertical pipes 査読

    Jiro Aoki, Yohei Hori, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   108 ( Part B )   1991 - 2001   2017年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Mass transfer rates, k(L), of single carbon dioxide bubbles contaminated with alcohols in vertical pipes of 12.5, 18.2 and 25.0 mm diameters were measured to investigate effects of the carbon chain length of the alcohols on kL. Four straight-chain alcohols, i.e. 1-pentanol, 1-heptanol, 1-octanol and 1-decanol, were used. A wide range of bubble diameter, d, covered ellipsoidal and Taylor bubbles. Effects of the alcohol concentration, C-sol, on k(L) were also investigated to make clear the values of C-sol corresponding to fully contaminated conditions. As a result, the following conclusions were obtained. (1) The kL of bubbles contaminated with alcohols decrease with increasing C-sol, and they become constant at high C-sol, i.e. bubbles in the latter C-sol ranges are fully-contaminated from the point of view of mass transfer. On the other hand, the rising velocities decrease with increasing C-sol due to the reduction of surface tension even when k(L) are independent of Cob (2) The k(L). of ellipsoidal bubbles fully-contaminated with alcohols decrease with increasing the carbon chain length, whereas the reduction rate of kL becomes smaller and smaller as the carbon chain length increases. The k(L). of fully-contaminated ellipsoidal bubbles can be expressed by accounting for the adsorption constant of alcohol in an available kL correlation. (3) The increase in the carbon chain length also decreases k(L) of fully-contaminated Taylor bubbles, whereas the effect of carbon chain length on k(L), becomes smaller with increasing d. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2017.01.058

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  • Effects of electrolyte on mass transfer from single carbon-dioxide bubbles in vertical pipes 査読

    HORI YOHEI, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Third International Symposium on Multiscale Multiphase Process Engineering (MMPE2017)   6 pages   2017年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Preliminary study on numerical simulations for temperature field of steam-air mixture in a circular tube with condensation 査読

    UTANOHARA YOICHI, YAMAMOTO YASUNORI, MURASE MICHIO, MORI KATSUYA, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017)   2017年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Experimental Investigation of Temperature Distribution in Condensing Steam-Air Flow in a Circular Tube 査読

    MORI KATSUYA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO, UTANOHARA YOICHI, YAMAMOTO YASUNORI, MURASE MICHIO

    2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017)   2017年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 鉛直管内での気液対向流に対する界面摩擦係数 査読

    楠木 貴世志, 山本 泰功, 村瀬 道雄, 林 公祐, 細川 茂雄, 冨山 明男

    混相流   31 ( 1 )   37 - 46   2017年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    <p>One-region computations with the annular flow model were done for counter-current flow limitation (CCFL) at the sharp-edged lower end of vertical pipes to evaluate effects of diameters and fluid properties on CCFL characteristics. CCFL characteristics computed with several correlations for interfacial friction factors were compared with CCFL data and the correlation proposed by Bharathan et al. (which is a function of void fraction) was selected. The adjustment factors were obtained to give good agreement between CCFL characteristics computed with the correlation by Bharathan et al. and CCFL data and were correlated with the viscosity ratio of gas and liquid phases and the dimensionless diameter. By using the correlation for interfacial friction factors by Bharathan et al. modified with the viscosity ratio of gas and liquid phases and the dimensionless diameter, effects of diameters and fluid properties on CCFL characteristics were computed.</p>

    DOI: 10.3811/jjmf.31.37

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  • Lift force acting on single bubbles in linear shear flows 査読

    S. Aoyama, K. Hayashi, S. Hosokawa, D. Lucas, A. Tomiyama

    International Journal of Multiphase Flow   96   113 - 122   2017年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    Lift coefficients, CL, of single bubbles in linear shear flows are measured to investigate effects of the bubble shape, the liquid velocity gradient and the fluid property on CL. The range of the Morton number, M, tested is from logM = − 6.6 to − 3.2. The shapes of bubbles are spherical and ellipsoidal. A correlation of bubble aspect ratio for single bubbles in infinite stagnant liquids proposed in our previous study can give good evaluations for bubbles in the linear shear flows. The CL of spherical bubbles at low bubble Reynolds numbers, Re, depend on the dimensionless shear rate Sr and Re and decrease with increasing Re. These characteristics agree with the Legendre-Magnaudet correlation. The use of a single dimensionless group such as Re, the Eötvös number, the Weber number and the Capillary number cannot correlate CL of non-spherical bubbles. The trend of the critical Re for the reversal of the sign of CL is the same as that for the onset of oscillation of bubble motion, which supports the mechanism proposed by Adoua et al., at least within the range of −6.6 ≤ logM ≤ −3.2. An experimental database of CL is provided for validation of available CL models and CFD.

    DOI: 10.1016/j.ijmultiphaseflow.2017.07.003

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  • Applicability of numerical simulations to counter-current flow limitation at lower end of a vertical pipe simulating inverted U-tubes in steam generator

    Takayoshi Kusunoki, Youichi Utanohara, Michio Murase, Shigeo Hosokawa, Akio Tomiyama

    2017 International Congress on Advances in Nuclear Power Plants, ICAPP 2017 - A New Paradigm in Nuclear Power Safety, Proceedings   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:International Congress on Advances in Nuclear Power Plants, ICAPP  

    The purpose of this study was to evaluate the applicability and issues for numerical simulations to counter-current flow limitation (CCFL) at the lower end of a vertical pipe. Numerical simulations were done for CCFL at the lower end of a vertical pipe simulating steam generator U-tubes with the k-m SST turbulence model implemented in the CFD software FLUENT63.26, and CCFL characteristics were evaluated at pressure P = 0.1-7 MPa. After CCFL had been reproduced at the lower end of a vertical pipe, the effects of pressure on CCFL characteristics were evaluated. The numerical simulation results obtained with the κ-σ SST turbulence model showed that Jl∗1/2 increased in the range of P = 0.1-1 MP a and decreased in the range of P = 1-7 MPa as P increased. The trend of Jl1/2 in the range of P &gt
    1 MPa was opposite to that of ROSA-IV/LSTF data at high pressure and temperature. CCFL data at high pressure and temperature are limited in the ROSA-IV/LSTF data
    therefore, further studies including the accumulation of experimental data are needed in order to evaluate the applicability of numerical simulations to CCFL at the lower end of a vertical pipe at P &gt
    1 MPa.

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  • 鉛直管内における気液対向流制限 査読

    山本 泰功, 村瀬 道雄, 林 公祐, 細川 茂雄, 冨山 明男

    混相流   30 ( 4 )   392 - 401   2016年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    <p>Characteristics of counter-current flow limitation (CCFL) inside vertical pipes with sharp-edged upper end (CCFL-P/SE) and with round-edged upper and lower ends (CCFL-P) were evaluated to clarify the dependence of the limiting locations. The CCFL is defined by the relationship between the gas and liquid volumetric fluxes (<i>J<sub>G</sub></i> and <i>J<sub>L</sub></i>) under a quasi-steady state after onset of flooding. CCFL correlations were constructed for CCFL-P/SE and CCFL-P based on the previous experimental data. The correlations were compared to the characteristics of CCFL at the vertical pipes of the sharp-edged upper end (CCFL-U) and the sharp-edged lower end (CCFL-L). CCFL-P has the highest liquid volumetric flux when CCFL occurs, and the lowest is CCFL-L. For the Wallis correlation, selection of the characteristic length of <i>w</i> = <i>D</i><sup>(1-<i>β</i>)</sup><i>L</i><sup><i>β</i></sup> (where <i>D</i> and <i>L</i> respectively denote the diameter and the Laplace capillary length) is quite important. Our results have indicated that CCFL-P/SE and CCFL-P are also expressed by <i>β</i> ≈ 0.5, CCFL-U is expressed by <i>β</i> = 1, and CCFL-L is expressed by <i>β</i> = 0.</p>

    DOI: 10.3811/jjmf.30.392

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  • A Semi-Empirical Correlation for Counter-Current Flow Limitation in a Vertical Pipe 査読

    MORI KATSUYA, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    ANS Conference 2016 Winter Meeting and Nuclear Technology Expo   3 pages   2016年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Study on two-phase swirling flows in a gas-liquid separator with three pick-off rings 査読

    H. Funahashi, K. Hayashi, S. Hosokawa, A. Tomiyama

    NUCLEAR ENGINEERING AND DESIGN   308   205 - 213   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Experiments on air-water two-phase swirling flows in a one-fifth scale model of a steam separator with three pick-off rings (PORs) are carried out to investigate characteristics of two-phase swirling flows and separator performance. In addition to flow observation, liquid film thickness, flow rates of separated liquid and pressure drops are measured. The ranges of the gas and liquid volume fluxes, J(G) and J(L), tested are 12.0 &lt;= J(G) &lt;= 17.8 m/s and 0.05 &lt;= J(L) &lt;= 0.11 m/s, respectively. The main conclusions obtained are as follows: (1) the liquid film thicknesses at the PORs are smaller than the gap widths of the PORs under the nominal operating condition, which results in a high liquid-separation rate, (2) the increase in J(G) decreases the flow rate of unseparated liquid, whereas the flow rate of unseparated liquid is independent of J(L) except for low J(G) conditions, under which the liquid film thicknesses at the 2nd and 3rd PORs tend to be larger than the gap widths of PORs, (3) the presence of the 2nd and 3rd PORs realizes high liquid-separation rates by capturing the liquid unseparated at the 1st POR and the pressure drops at the 2nd and 3rd PORs are much smaller than that at the 1st POR, and (4) the pressure drops at the swirler and the 1st POR, which are the main source of the pressure drop of the separator under the nominal operating condition, increase with J(G), whereas J(L) increases only the latter. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nucengdes.2016.08.030

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  • 時空間フィルタ流速計(SFV)を用いた混相流の速度分布計測 招待

    細川 茂雄, 冨山 明男

    化学工学   Vol. 80 ( No. 8 )   pp. 488 - 491   2016年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:化学工学会  

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  • Effect of Bubbles on Turblence Kinetic Energy Budget in Vertical Duct flow 査読

    HOSOKAWA SHIGEO, KARASAWA HIROKI, IWAI RYOSUKE, TOMIYAMA AKIO

    18th Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon 2016   2016年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 細径多列流路の折り返し合流部における冷媒二相流の流量分配特性 査読

    村上 泰城, 石橋 晃, 細川 茂雄, 冨山 明男

    日本機械学会論文集   Vol. 82 ( No. 838 )   15 - 00685   2016年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    DOI: 10.1299/transjsme.15-00685

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  • Gaslift pump making use of phase change of working fluid 査読

    Shigeo Hosokawa, Shudai Fujimoto, Akio Tomiyama

    APPLIED THERMAL ENGINEERING   103   1119 - 1125   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Improvement of efficiency of a gaslift pump is required for lifting submarine resources economically. We propose a gaslift pump utilizing phase change of working fluid to improve the efficiency by avoiding air compression. A working fluid, which has a boiling point lower than surrounding temperature, is supplied as liquid to an evaporator near the bottom of a riser pipe through an adiabatic pipe. The working fluid boils at the evaporator due to heating from the surrounding liquid. The generated gas is injected into the riser pipe instead of compressed air and forms gas-liquid two-phase flow, by which the water is drawn from the bottom opening of the riser pipe. The working fluid is separated from the drawn water at the top of the pipe, and it flows into a cooler to supply the condensed liquid into the adiabatic pipe again. This pump needs the energy only to cool the working fluid, i.e. no energy is required for compressing gas. The feasibility of the pump is confirmed through the experiments using a prototype gaslift pump using a hydro-fluorocarbon as the working fluid. Prediction of the flow rate of drawn water is also carried out. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.applthermaleng.2016.05.010

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  • Experimental Evaluation of Surfacant Concentration at an Interface of Single Spherical Drop 査読

    HOSOKAWA SHIGEO, MASUKURA YUYA, HAYASHI KOSUKE, TOMIYAMA AKIO

    9th International Conference on Multiphase Flow   No. 262, 6 pages   2016年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Mass Transfer from Single Carbon Dioxide Bubbles in Water-Alchol Solutions in a Verical Pipe 査読

    HORI YOHEI, AOKI JIRO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    9th International Conference on Multiphase Flow   No. 245, 6 pages   2016年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Numerical Simulation of Surfactant Concentration at an Interface of Single Spherical Drop 査読

    HAYASHI KOSUKE, MASUKURA YUYA, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    9th International Conference on Multiphase Flow   No. 262, 6 pages   2016年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Condensation experiments for counter-current flow limitation in an inverted U-tube 査読

    Takayoshi Kusunoki, Takahiro Nozue, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama, Michio Murase

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   53 ( 4 )   486 - 495   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    In this study, we measured counter-current flow limitation (CCFL) characteristics in an inverted U-tube (18.4 mm diameter and 1.0 m straight-part length) simulating steam generator (SG) U-tubes under conditions of steam condensation at pressures of 0.1-0.14 MPa. Differential pressure P between the top of the inverted U-tube and the lower tank was measured, and the flow patterns wave estimated by comparing the waveforms of P with those in air-water experiments. As a result, we classified the flow patterns under CCFL conditions into CCFL-P, CCFL-L and CCFL-T. The falling water flow rate under CCFL conditions slightly increased as the pressure increased and the cooling water temperature decreased (subcooling of cooling water increased). In the case of CCFL-L, CCFL characteristics in the inverted U-tube were between those in air-water and saturated steam-water experiments at 0.1 MPa. Furthermore, we derived a Wallis type CCFL correlation and its uncertainty from CCFL data, including previously measured data, i.e., J*(1/2)(G) + 0.88J(L)*(1/2) = 0.76 +/- 0.05.

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  • ルームエアコン用高性能気液分離器の開発 査読

    村上 泰城, 牧野 浩招, 早丸 靖英, 斎藤 直, 永井 宏典, 細川 茂雄, 冨山 明男

    混相流   Vol. 30 ( No. 1 )   pp. 49 - 56   2016年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    A gas-liquid separation cycle is one of the technologies that can improve the cooling capacity. In this study, the availability of a conventional gas-liquid separator for the room air conditioner of 7.1 kW class was evaluated and an improved gas-liquid separator that has an inflow pipe with a bottom hole and some side holes was proposed. The proposed gas-liquid separator was further improved for easy manufacturing and the gas separation efficiency and the cooling capacity when the gas-liquid separation cycle was applied to the room air conditioner of 7.1 kW class were investigated. As a result, approximately complete gas-liquid separation was realized and the cooling capacity was improved by about 3%.

    DOI: 10.3811/jjmf.30.49

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    その他リンク: https://jlc.jst.go.jp/DN/JLC/20022423281?from=CiNii

  • Shapes of ellipsoidal bubbles in infinite stagnant liquids 査読

    S. Aoyama, K. Hayashi, S. Hosokawa, A. Tomiyama

    INTERNATIONAL JOURNAL OF MULTIPHASE FLOW   79   23 - 30   2016年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Aspect ratios E of ellipsoidal bubbles in infinite stagnant clean liquids are measured for log M = -6.6, -5.5, -4.9 and -3.9, where M is the Morton number. An empirical correlation of E applicable to a wide range of the Morton number is proposed by making use of the present data and Sugihara's data at log M = -11 (2007). The aspect ratio in this correlation is expressed in terms of the combination of the Eotvos number and the bubble Reynolds number to account for the effects of the inertial, viscous, buoyant and surface tension forces on E. Terminal velocities of ellipsoidal bubbles are accurately predicted by using the proposed correlation and a drag correlation proposed by Rastello et al. (2011). (C) 2015 Elsevier Ltd. All rights reserved.

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  • 気水分離器における液相分離部が気液分離性能に及ぼす影響 査読

    上遠野 健一, 田丸 隼人, 細川 茂雄, 林 公祐, 冨山 明男

    混相流   29 ( 4 )   343 - 350   2015年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Effects of Surfactants on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes 招待 査読

    Jiro Aoki, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    CHEMICAL ENGINEERING & TECHNOLOGY   38 ( 11 )   1955 - 1964   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

    Mass transfer from single fully contaminated carbon dioxide bubbles rising through vertical pipes was measured to investigate the effects of surfactants. The diameter ratio of the bubble diameter to the pipe diameter was varied to cover various bubble shapes from ellipsoidal to Taylor bubbles. Triton X-100 and 1-octanol served as surfactants. The mass transfer rates, k(L), of contaminated bubbles in the ellipsoidal regime were smaller than those of clean bubbles due to the interface immobilization. The k(L) of Taylor bubbles contaminated with Triton X-100 and 1-octanol showed varying trends because of the difference in the surfactant distributions at the bubble interfaces which strongly depend on the Hatta number. The Sherwood numbers of contaminated bubbles were well correlated by introducing the bubble diameter, at which the bubble shape transits from ellipsoidal to Taylor bubbles.

    DOI: 10.1002/ceat.201500063

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  • Two-Phase Swirling Flow in a Gas-Liquid Separator 査読

    FUNAHASHI HAYATO, 林 公祐, 細川 茂雄, 冨山 明男

    ANS Conference 2015 Winter Meeting and Nuclear Technology Expo   2 pages   2015年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Interfacial Shear Stress of Single Drop Using Spatiotemporal Filter Velocimetry 査読

    HOSOKAWA Shigeo, MASUKURA Yuya, HAYASHI Kosuke, TOMIYAMA Akio

    7th European-Japanese Two-Phase Flow Group Meeting   3 pages   2015年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Generation of submicron bubbles in a pressurized dissolution method 査読

    HOSOKAWA SHGEO, BABA YUJI, TOMIYAMA AKIO, MAEDA YASUNARI, ITO YOSHIHIRO

    9th International Symposium on Measurement Techniques for Multiphase Flows, ISTMF2015   2015年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Airlift Pump making use of Phase Change of Working Fluid 査読

    HOSOKAWA SHIGEO, FUJIMOTO SHUDAI, TOMIYAMA AKIO

    ASME-JSME-KSME Joint Fluid Engineering Conference 2015 (AJK 2015)   2015年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effects of fluid properties on CCFL characteristics at a vertical pipe lower end 査読

    Takayoshi Kusunoki, Michio Murase, Yuki Fujii, Takahiro Nozue, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   52 ( 6 )   887 - 896   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The purpose of this study is to derive a counter-current flow limitation (CCFL) correlation and evaluate its uncertainty for steam generator (SG) U-tubes in a pressurized water reactor (PWR). Experiments were conducted to evaluate effects of the liquid viscosity on CCFL characteristics using air-40wt% or air-60wt% glycerol water solution and saturated steam-water at atmospheric pressure with vertical pipes simulating the lower part of the SG U-tubes. The steam-water experiments confirmed that CCFL characteristics could be expressed in terms of the Wallis parameters (J(G)* and J(L)*) for the pipe diameters of D = 14, 20, and 27mm. A CCFL correlation was derived using the ratio mu(G)/mu(L) of the viscosities of the gas and liquid phases, mu(G) and mu(L), as a correction term representing effects of fluid properties, where J(G)(*1/2)(mu(G)/mu(L))(-0.07) was expressed by a cubic function of J(L)(*1/2)(mu(G)/mu(L))(0.1). In the correlation, the constant C indicating the value of J(G)(*1/2)(mu(G)/mu(L))(-0.07) at J(L)* = 0 was (1.04 +/- 0.05), and this uncertainty of +/- 0.05 would cover most of the previous experimental data including the ROSA-IV/LSTF data at 1, 3, and 7 MPa.

    DOI: 10.1080/00223131.2014.990533

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  • Dissolution of Single Carbon Dioxide Bubbles in a Vertical Pipe 査読

    Shogo Hosoda, Gretar Tryggvason, Shigeo Hosokawa, Akio Tomiyama

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   48 ( 6 )   418 - 426   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Dissolution of a carbon dioxide (CO2) bubble in the downward flow of water or glycerol-water solutions in a vertical pipe is measured by using an image processing method. Numerical predictions of bubble dissolution using a Sherwood number Sh correlation for a bubble in stagnant water, which was proposed in our previous study, are also carried out to examine its applicability to single bubbles in several fluid property systems. The correlation can predict the bubble dissolution well, during which large bubbles change from Taylor to small bubbles, not only in water but also in glycerol-water solutions. A small bubble in a 50 wt% solution predicted by using the correlation, however, dissolves slightly faster than the experiments in the diameter range of 5-8 mm. CO2 concentration fields visualized by using laser-induced fluorescence show that this is due to the difference in wake structures in the stagnant liquid and in the downward flow, that is, vortex shedding with shape oscillation in the stagnant liquid enhances mass transfer from small bubbles; whereas the closed wake in the downward flow reduces the mass transfer rate. This, in turn, implies that the Sh correlation can give good predictions for long-term bubble dissolution in various stagnant liquids.

    DOI: 10.1252/jcej.14we241

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  • Dissolution of Single Carbon Dioxide Bubbles in Glycerol-Water Solution 査読

    HOSODA SHOGO, TRYGGVASON GRETAR, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Journal of Chemical Engineering of Japan   Vol. 48 ( No. 6 )   pp. 418 - 426   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Gaslift Pump making use of Phase Change of Working Fluid 査読

    HOSOKAWA SHIGEO, FUJIMOTO SHUDAI, TOMIYAMA AKIO

    Japan-U.S. Seminar on Two-phase Flow Dynamics   2015年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 時空間フィルタ流速計を用いた流路内速度分布及び流量の測定 査読

    北畑 恭助, 細川 茂雄, 冨山 明男

    日本機械学会論文集   81 ( 822 )   14 - 00597   2015年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

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  • Generation mechanism of micro-bubbles in a pressurized dissolution method 査読

    Yasunari Maeda, Shigeo Hosokawa, Yuji Baba, Akio Tomiyama, Yoshihiro Ito

    EXPERIMENTAL THERMAL AND FLUID SCIENCE   60   201 - 207   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Micro-bubbles are in use in many industrial fields such as water treatment, purification of lake water, chemical engineering, washing processes and housing equipment by virtues of their large interfacial area concentration and long residence time in liquid. A pressurized dissolution method based on decompression of liquid with dissolved gas is one of promising methods for generating fine micro-bubbles at high number density. Since the mechanism of micro-bubble generation is not clarified yet, design and improvement of micro-bubble generators are based on trial and error. In this study, effects of liquid volume flux at a decompression nozzle and dissolved gas concentration in the upstream region of the nozzle on diameter and number density of generated micro-bubbles are examined to understand generation mechanism of micro-bubbles in a pressurized dissolution method. The diameter and the number density of micro-bubbles are measured by using phase Doppler anemometry (PDA) in the downstream region of the nozzle, and the flow patterns in the nozzle are visualized by using a high-speed camera. The experimental results show that diameter and number density of generated micro-bubbles depend on cavitation pattern at the nozzle, and that cavitation bubbles containing not only vapor but also non-condensable gas become micro-bubbles due to their shrink caused by condensation of the vapor in the downstream region of the nozzle. (C) 2014 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.expthermflusci.2014.09.010

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  • Effects of subcooling on sound generation by vapor bubbles in water 招待 査読

    Kosuke Hayashi, Masaya Tateyama, Kazutaka Ikeuchi, Shigeo Hosokawa, Akio Tomiyama, Makoto Hirotsu, Nobuhiro Takeda

    Multiphase Science and Technology   27 ( 1 )   67 - 75   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Begell House Inc.  

    Sound generated by vapor bubbles condensing in subcooled water was measured to investigate effects of the degree, ΔT, of subcooling. Saturated steam from a boiler was injected into a horizontal water pipe flow through an orifice of 1 mm in diameter. The duct diameter was 16 mm and the Reynolds number of water was about 5 × 104. The subcooling was varied from 10 to 40 K. The sound level increased with increasing ΔT for ΔT ≤ 20 K, whereas it was independent of ΔT at higher ΔT. Video images of condensing bubbles revealed that the interfacial velocity of a condensing bubble had the same trend as that of the sound level, and therefore, the interfacial velocity in condensation is the key in the sound level. The rapid condensation at high ΔT induced emission of microbubbles and secondary pressure pulse generation. The latter also contributes to the increase in the sound level.

    DOI: 10.1615/MultScienTechn.v27.i1.40

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  • Effects of subcooling on sound generation by vapor bubbles in water 査読

    Kosuke Hayashi, Masaya Tateyama, Kazutaka Ikeuchi, Shigeo Hosokawa, Akio Tomiyama, Makoto Hirotsu, Nobuhiro Takeda

    Multiphase Science and Technology   27 ( 1 )   67 - 75   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Begell House Inc.  

    Sound generated by vapor bubbles condensing in subcooled water was measured to investigate effects of the degree, ΔT, of subcooling. Saturated steam from a boiler was injected into a horizontal water pipe flow through an orifice of 1 mm in diameter. The duct diameter was 16 mm and the Reynolds number of water was about 5 × 104. The subcooling was varied from 10 to 40 K. The sound level increased with increasing ΔT for ΔT ≤ 20 K, whereas it was independent of ΔT at higher ΔT. Video images of condensing bubbles revealed that the interfacial velocity of a condensing bubble had the same trend as that of the sound level, and therefore, the interfacial velocity in condensation is the key in the sound level. The rapid condensation at high ΔT induced emission of microbubbles and secondary pressure pulse generation. The latter also contributes to the increase in the sound level.

    DOI: 10.1615/MultScienTechn.v27.i1.40

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  • Distributions of void fraction and liquid velocity in air-water bubble column 査読

    Shimpei Ojima, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF MULTIPHASE FLOW   67   111 - 121   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Multi-fluid simulations of heterogeneous bubbly flows in an air-water bubble column were carried out to verify the speculation that a heterogeneous bubbly flow is predictable without turbulence models such as k-epsilon and LES models, provided that the velocity fluctuation caused by large-scale vortical flow structures prevails over the bubble-induced and shear-induced turbulences. Experiments on the heterogeneous air-water bubbly flows in a rectangular bubble column were also carried out to obtain experimental data of the mean velocity, fluctuation velocity and void fraction for validation of the numerical method. A small LDV probe developed in our previous study was utilized to measure the liquid velocity in the column at high spatial and high temporal resolutions. The distribution of void fraction was measured using an electrical conductivity probe. The conclusions obtained under the present experimental conditions are as follows: (1) the small LDV probe is of great use in measuring the distributions of mean and fluctuation velocities of the liquid phase at high spatial and high temporal resolutions, (2) the velocity fluctuation in the heterogeneous regime in the bubble column is mainly due to large-scale vortical structures, and (3) the multi-fluid model can give good predictions of a heterogeneous bubbly flow without using the turbulence models, provided that large-scale vortical structures in the flow prevail over the bubble-induced and shear-induced turbulences. (C) 2014 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijmultiphaseflow.2014.05.008

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  • Condensation Experiments for Counter-current Flow Limitation at Lower End of an Inverted U-Tube 査読

    KINOSHITA TAKAYOSHI, MURASE MICHIO, FUJII YUKI, NOZUE TAKAHIRO, HSOKAWA SHIGEO, TOMIYAMA AKIO

    10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10)   USB   2014年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Liquid Velocity Distribution in Turbulent Bubbly Flow in a 2x2 Rod Bundle 査読

    HOSOKAWA SHIGEO, OGAWA YUUMA, TOMIYAMA AKIO

    9th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS 9)   USB   2014年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • CCFL of Steam-Condensate Two-Phase Flow in a U-Tube 査読

    NOZUE TAKAHIRO, FUJII YUKI, MURASE MICHIO, 林 公祐, 細川 茂雄, 冨山 明男

    ANS Conference 2014 Winter Meeting and Nuclear Technology Expo   CD-ROM   2 pages   2014年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effects of Surfactant on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes 査読

    AOKI JIRO, HAYASHI KOSUKE, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Proc. 2nd International Symposium on Multiscale Multiphase Process Engineering   pp. 94 - 99   2014年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Numerical Simulaton of Slugging of Stagnant Liquid at a V-Shaped Elbow in a Pipeline 査読

    IRIKURA Motoki, MAEKAWA Munenori, HOSOKAWA SHIGEO, TOMIYAMA AKIO

    Applied Mathematical Modelling   38 ( 17-18 )   4238 - 4248   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

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  • 下降-上昇傾斜管のV字部におけるスラグ発生の数値シミュレーション 査読

    入倉 基樹, 前川 宗則, 細川 茂雄, 冨山 明男

    化学工学論文集   40 ( 4 )   275 - 281   2014年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:化学工学会  

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  • Evaluation of Interfacial Shear Stress of Single Drop using Spatiotemporal Filter Velocimetry 査読

    HOSOKAWA SHIGEO, KITAHATA KYOSUKE, HAYASHI KOSUKE, TOMIYAMA AKIO

    17th International Symposium on Applications of Laser Techniques to Fluid Mechamics (LISBON 2014)   2014年7月

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  • Temperature fluctuation phenomena in a normally stagnant pipe connected downward to a high velocity and high temperature main pipe 査読

    Akira Nakamura, Koji Miyoshi, Toru Oumaya, Nobuyuki Takenaka, Shigeo Hosokawa, Daisuke Hamatani, Masatsugu Hase, Daisuke Onojima, Yasuhiro Yamamoto, Atsushi Saito

    NUCLEAR ENGINEERING AND DESIGN   269   360 - 373   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Numerous pipes branch off from the main pipes in power plant facilities. Main pipe flow initiates a cavity flow in a downward branch pipe with a closed end and a thermally stratified layer may form in the branch pipe if there is significant temperature difference in the main and branch pipe fluids. Fluctuation of a thermally stratified layer may initiate thermal fatigue crack in the branch pipe. In the present study, flow structures and temperature fluctuations in a branch pipe are investigated by experiments and numerical simulations to understand detailed behavior of the layer in a straight pipe and in a bent pipe. The penetration length of the main flow is measured for various main pipe flow velocities. The flow patterns in a straight pipe are divided into three regions by visualization with a tracer method, i.e., cavity flow in region 1, disturbed flow in the transition region, and spiral flow in region 2. The fluid temperature fluctuation in a straight pipe after the increase of main pipe flow velocity is attenuated in several hundred seconds since the thermal stratified layer goes down under the area into which the spiral vortex reaches. The fluid temperature in a bent pipe fluctuates when the spiral vortex reaches its lowest point after a long time period. Periodical velocity fluctuations during several tens second period are observed in the spiral flow. The mechanism of temperature fluctuation near the thermal stratified layer is considered with respect to the interference by the spiral flow and the fixed thermal stratified layer at the bent section by the cold water provided from the horizontal section. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nucengdes.2013.07.006

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  • Mass transfer from a bubble in a vertical pipe 査読

    Shogo Hosoda, Satoru Abe, Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   69   215 - 222   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Mass transfer from single carbon dioxide bubbles in vertical pipes is measured using a stereoscopic image processing method to develop a mass transfer correlation applicable to a wide range of bubble diameters in standard pipe sizes. The diameters of pipes used are 12.5, 18.2, and 25.0 mm and the bubble diameter ranges from 5 to 26 mm. The ratio, lambda, of the bubble diameter to the pipe diameter is varied from 0.2 to 1.8, which covers various bubble shapes such as spheroidal, wobbling, cap, and Taylor bubbles. Measured Sherwood numbers, Sh, strongly depend on bubble shape, i.e., Sh of Taylor bubbles differs from that of spheroidal and wobbling bubbles. The Sherwood numbers are correlated in terms of the Peclet number Pe and lambda. The applicability of the proposed correlation to long-term bubble dissolution process is examined through comparisons between measured and predicted dissolution processes. The predictions are carried out by solving mass conservation equations not only for carbon dioxide but also for nitrogen and oxygen. Good agreements are obtained in the dissolution processes for various bubble sizes and the three pipe diameters. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2013.10.031

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  • Void distribution and bubble motion in bubbly flows in a 4 x 4 rod bundle. Part I: Experiments 査読

    Shigeo Hosokawa, Kosuke Hayashi, Akio Tomiyama

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   51 ( 2 )   220 - 230   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Lack of local void fraction data in a rod bundle makes it difficult to validate a numerical method for predicting gas-liquid two-phase flow in the bundle. Distributions of local void fraction and bubble velocity in each subchannel in a 4x4 rod bundle were, therefore, measured using a double-sensor conductivity probe. Liquid velocity in the subchannel was also measured using laser Doppler velocimetry (LDV) to obtain relative velocity between bubbles and the liquid phase. The size and pitch of rods were 10 and 12.5mm, respectively. Air and water at atmospheric pressure and room temperature were used for the gas and liquid phases, respectively. The volume fluxes of gas and liquid phases ranged from 0.06 to 0.15m/s and from 0.9 to 1.5m/s, respectively. Experimental results showed that the distributions of void fraction in inner and side subchannels depend not only on lift force acting on bubbles but also on geometrical constraints on bubble dynamics, i.e. the effects of rod walls on bubble shape and rise velocity. The relative velocity between bubbles and the liquid phase in the subchannel forms a non-uniform distribution over the cross-section, and the relative velocity becomes smaller as bubbles approach the wall due to the wall effects.

    DOI: 10.1080/00223131.2013.862189

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  • Void distribution and bubble motion in bubbly flows in a 4×4 rod bundle. Part II: numerical simulation 査読

    林 公祐, 細川 茂雄, 冨山 明男

    Journal of Nuclear Science and Technology   51 ( 5 )   580 - 589   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Time Evolution of Diameter of Micro-Bubbles Generated by a Pressurized Dissolution Method 査読

    Kazuya Ishii, Shudai Fujimoto, Shigeo Hosokawa, Akio Tomiyama, Yoshihiro Ito, Yasunari Maeda

    8TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1592   333 - 340   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Size distributions of micro-bubbles and concentrations of dissolved oxygen in water in a square duct downstream of the decompression nozzle were measured to investigate the time evolution of bubble diameter and the mass transfer of dissolved gas between bubbles and water after bubble generation in a pressurized dissolution method. A numerical simulation based on the Rayleigh-Plesset equation was also carried out to predict time evolutions of bubble diameter and concentration of dissolves gas. The validity of the prediction was discussed through the comparison between the predictions and the experiments. As a result, the following conclusions were obtained: (1) When cavitation does not occur in the decompression nozzle, few micro-bubbles are generated at the nozzle and the mass transfer rate between bubbles and water in the downstream region of the nozzle is low due to a low interface area concentration. The mass transfer due to bubble nucleation is negligibly small in the downstream region of the decompression nozzle in spite of the supersaturated concentration of the dissolved gas. (2) When cavitation occurs in the nozzle, a lot of micro-bubbles are generated at the nozzle and therefore, the mass transfer rate between the phases becomes high. Hence, the bubble diameter and the void fraction increase and the concentration of dissolved gas in water decreases with the time elapsed after the bubble generation. (3) The proposed numerical method can reasonably predict time evolution of bubble size distributions, void fractions and concentrations of dissolved gas, provided that a reliable initial condition is available. Since the numerical simulation assumes that no bubble nucleation occurs in the downstream region of the nozzle, the agreement between the prediction and the experiments proves low influence of the bubble nucleation on the mass transfer between the phases.

    DOI: 10.1063/1.4872124

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  • Numerical Simulation of Slug Generation at a V-Shaped Elbow between Inclined Pipes 査読

    Motoki Irikura, Munenori Maekawa, Shigeo Hosokawa, Akio Tomiyama

    KAGAKU KOGAKU RONBUNSHU   40 ( 4 )   275 - 281   2014年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SOC CHEMICAL ENG JAPAN  

    Liquid slugs in oil and gas two-phase flow in hilly-terrain pipelines are often generated at V-shaped elbows and induce strong pressure fluctuation. The knowledge on characteristic of slugs such as slug frequency, velocity and length is required when designing the pipelines. In this study, numerical simulation based on a three-dimensional two-fluid model is carried out to predict liquid slugs generated at the elbows. The free surface model for the interfacial area density is employed to describe the interaction between the phases. Comparisons with experimental data show that the two-fluid model is able to well predict the liquid slug behavior in the ascending pipe at the downstream of the V-shaped elbow and the slug characteristics.

    DOI: 10.1252/kakoronbunshu.40.275

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  • MASS TRANSFER FROM SINGLE CARBON DIOXIDE BUBBLES IN CONTAMINATED WATER 査読

    Jiro Aoki, Kosuke Hayashi, Shogo Hosoda, Shigeo Hosokawa, Akio Tomiyama

    ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING - 2014, VOL 1D: SYMPOSIA   FEDSM2014 - 21103, 8 pages   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Mass transfer from single carbon dioxide bubbles rising through contaminated water in a vertical pipe of 12.5 mm diameter was measured to investigate effects of surfactant. The bubble diameter was widely varied to cover various bubble shapes such as spheroidal, wobbling, cap and Taylor bubbles. The gas and liquid phases were 99.9 % purity carbon dioxide and a surfactant solution made of purified water and Triton X-100. Comparison of mass transfer rates between contaminated and clean bubbles made clear that the surfactant decreases the mass transfer rates of small bubbles. The Sherwood number of small bubbles in the extreme cases, i.e. zero and the highest surfactant concentrations, is well correlated in terms of the bubble Reynolds number, Schmidt number and the ratio, lambda, of the bubble diameter to pipe diameter. The Sherwood numbers at intermediate surfactant concentration, however, are not well correlated using available correlations. The mass transfer rates of Taylor bubbles also decrease with increasing the surfactant concentration. They however increase with the diameter ratio and approaches that of clean Taylor bubbles as 2, increases. The main cause of this tendency was revealed by interface tracking simulations, i.e. the surfactant adsorbs only in the bubble tail region and the nose-to-side region is almost clean at high lambda.

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  • Time Evolution of Diameter of Micro-Bubbles Generated by a Pressurized Dissolution Method 査読

    Kazuya Ishii, Shudai Fujimoto, Shigeo Hosokawa, Akio Tomiyama, Yoshihiro Ito, Yasunari Maeda

    8TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1592   333 - 340   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Size distributions of micro-bubbles and concentrations of dissolved oxygen in water in a square duct downstream of the decompression nozzle were measured to investigate the time evolution of bubble diameter and the mass transfer of dissolved gas between bubbles and water after bubble generation in a pressurized dissolution method. A numerical simulation based on the Rayleigh-Plesset equation was also carried out to predict time evolutions of bubble diameter and concentration of dissolves gas. The validity of the prediction was discussed through the comparison between the predictions and the experiments. As a result, the following conclusions were obtained: (1) When cavitation does not occur in the decompression nozzle, few micro-bubbles are generated at the nozzle and the mass transfer rate between bubbles and water in the downstream region of the nozzle is low due to a low interface area concentration. The mass transfer due to bubble nucleation is negligibly small in the downstream region of the decompression nozzle in spite of the supersaturated concentration of the dissolved gas. (2) When cavitation occurs in the nozzle, a lot of micro-bubbles are generated at the nozzle and therefore, the mass transfer rate between the phases becomes high. Hence, the bubble diameter and the void fraction increase and the concentration of dissolved gas in water decreases with the time elapsed after the bubble generation. (3) The proposed numerical method can reasonably predict time evolution of bubble size distributions, void fractions and concentrations of dissolved gas, provided that a reliable initial condition is available. Since the numerical simulation assumes that no bubble nucleation occurs in the downstream region of the nozzle, the agreement between the prediction and the experiments proves low influence of the bubble nucleation on the mass transfer between the phases.

    DOI: 10.1063/1.4872124

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  • Measurement of Bubbly Flow Using Spatiotemporal Filter Velocimetry Coupled with Molecular Tagging 査読

    Shigeo Hosokawa, Satoshi Ikeda, Akio Tomiyama

    8TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1592   224 - 231   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Spectrum analysis of fluctuating velocity is one way for understanding turbulence characteristics. It is however not easy to acquire accurate velocity data at high data acquisition rates in LDV measurements due to uncontrollable tracer particles. A molecular tagging method is one of the methods to form controllable tags in flow fields. We also developed spatiotemporal filter velocimetry (SFV) which can measure velocity with spatial resolution and accuracy as high as LDV. In this study, the spatiotemporal filter velocimetry was therefore coupled with a molecular tagging method to obtain time-series velocity data with high spatial resolutions ant high data acquisition rates. Photobleaching reaction was used to form molecular tags in a flow field. The developed system was applied to single-phase and bubbly flows in a vertical square duct to examine its applicability to spectrum analysis of single phase and bubbly flows. As a result, we confirmed that the SFV coupled with molecular tagging was of use for accurate velocity measurements at high data acquisition rates, and therefore, for spectrum analysis of fluctuating velocity of turbulent single phase and bubbly flows. The turbulence spectra in the vicinity of the wall showed that the bubbles traveling in the vicinity of the wall enhance turbulence intensity in the vicinity of the wall and the turbulence generated by the bubbles dissipates through a pseudo cascade process.

    DOI: 10.1063/1.4872108

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  • Photobleaching Molecular Tagging Velocimetry and Its Application to Bubbly Flows 招待 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Internatinal Symposium on Measurement Techniques for Multiphase Flows, ISMTMF2013   2013年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurement of Bubbly Flow Using Spatiotemporal Filter Velocimetry Coupled with Molecular Tagging 査読

    HOSOKAWA Shigeo, IKEDA Satoru, TOMIYAMA Akio

    Internatinal Symposium on Measurement Techniques for Multiphase Flows, ISMTMF2013   2013年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Development of a submersible small fiber LDV probe and its application to flows in a 4 x 4 rod bundle 査読

    Shigeo Hosokawa, Ikumi Mikihara, Akio Tomiyama

    NUCLEAR ENGINEERING AND DESIGN   263   342 - 349   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Optical measurement is an effective and accurate method to understand flow structures of multiphase flows. However, we frequently encounter difficulty in optical access due to the presence of interface and the complex geometry of a flow field. In the present study, we have developed small LDV optics to avoid the difficulty in optical access by installing the LDV probe into a channel component or by submerging the LDV probe into a flow field. The developed LDV optics consists of a manipulator and the probe. The manipulator splits a beam emitted from an Ar-ion laser into four beams. Each beam is introduced into an optical fiber through beam adjustment optics, and is transmitted to the probe through the fiber. The diameter of the probe is 7 mm. The laser beams emitted from the fibers in the probe are focused by a front lens of the probe and form a measurement volume. Scattered light from tracer particles are received by the probe and collected into a receiving fiber installed in the probe. The developed system is applied to laminar and turbulent flows in a rectangular duct for validation. Comparisons with a conventional LDV system show that the accuracy and reliability of the developed system are the same level as the conventional system. The application of the developed system to single-phase and bubbly flows in a 4 x 4 rod bundle demonstrates that the system has a large potential of measuring single-phase and multiphase flows in a channel with a complex geometry. (c) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nucengdes.2013.06.009

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  • Distribution of Void Fraction and Liquid Velocity in Air-Water Bubble Column 査読

    OJIMA Shinpei, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

    9th UK-Japan Seminar on Multi-Phase Flow   2013年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Tomographic spatial filter velocimetry for three-dimensional measurement of fluid velocity 査読

    Shigeo Hosokawa, Takaaki Matsumoto, Akio Tomiyama

    EXPERIMENTS IN FLUIDS   54 ( 9 )   1597   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Spatial filter velocimetry (SFV) is extended to three-dimensional three-component velocimetry by coupling the SFV processing with a tomographic technique, which reconstructs three-dimensional particle distributions from stereoscopic particle images recorded by two cameras. Since time duration of a ghost particle traveling through an interrogation area of SFV is shorter than the transit time of a real tracer particle, a validation method of velocity data based on a particle transit time is used to eliminate ghost particles generated in the particle reconstruction process. Effect of a ghost particle on velocity evaluation is not significant due to the short transit time of a ghost particle. The developed system is applied to a free jet, and an impinging jet discharged from a circular pipe. Three-dimensional distributions of time-averaged velocity vectors of the jets are successfully measured by the developed tomographic spatial filter velocimetry (Tomo-SFV) in spite of using only two cameras. The peak-locking errors, which are apt to occur in particle image velocimetry measurements, do not appear in Tomo-SFV measurements.

    DOI: 10.1007/s00348-013-1597-0

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  • CCFL at Lower End of a Vertical Pipe 査読

    FUJII Yuki, DOI Taiga, MURASE Michio, HOSOKAWA Shigeo, TOMIYAMA Akio

    ANS Winter Meeting   2013年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:American Nuclear Society  

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  • Measurement of bubble velocity using spatial filter velocimetry 査読

    Shigeo Hosokawa, Takaaki Matsumoto, Akio Tomiyama

    EXPERIMENTS IN FLUIDS   54 ( 6 )   1538   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Spatial filter velocimetry (SFV) based on spatial filtering of time-series particle images proposed by Hosokawa and Tomiyama is applied to a bubble column to examine its applicability to bubble velocity measurement. The edge detection process is added in the SFV processing to reduce the size of image pattern and to obtain accurate velocity data. It is demonstrated that SFV is able to measure the bubble velocity in various spatial scales with the same accuracy as PTV. The measured mean bubble velocity does not depend on the interrogation size in the measurements. To the contrary, the standard deviation of measured bubble velocity becomes higher as the interrogation size decreases due to the superposition of interfacial wave velocity on the measured velocity. Simultaneous measurement of bubble and liquid velocities is also carried out for a planar bubble plume. The results clearly show that SFV can measure bubble and liquid velocities simultaneously.

    DOI: 10.1007/s00348-013-1538-y

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  • Effects of Shape Oscillation on Mass Transfer from a Taylor Bubble 査読

    細田 将吾, 林 公祐, 細川 茂雄, 冨山 明男

    8th International Conference on Multiphase Flow, ICMF2013   ICMF2013 - 286, USB memory, 8 pages   2013年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Void Distribution and Bubble Motion in Bubbly Flows in a 4 X 4 Rod Bundle 査読

    HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

    15th International Topical Meeting on Nuclear Reactor Thermal - Hydraulics, NURETH-15   NURETH15 - 244, USB memory, 12 pages   2013年5月

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  • Effects of Hydrophilic Particles on Bubble Coalescence in Slurry Bubble Column 査読

    小嶋 真平, 林 公祐, 細川 茂雄, 冨山 明男

    8th International Conference on Multiphase Flow, ICMF2013   ICMF2013 - 157, USB memory, 13 pages   2013年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Mass Transfer from Single Carbon Dioxide Bubbles in Glycerol-Water Solution 査読

    青木 二郎, 細田 将吾, 林 公祐, 冨山 明男, 細川 茂雄

    8th International Conference on Multiphase Flow, ICMF2013   ICMF2013 - 229, USB memory, 9 pages   2013年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • NUMERICAL SIMULATION OF BUBBLY FLOWS IN A 4 X 4 ROD BUNDLE USING A MULTI-FLUID MODEL 査読

    林 公祐, 細川 茂雄, 冨山 明男

    15th International Topical Meeting on Nuclear Reactor Thermal - Hydraulics, NURETH-15   NURETH15 - 245, USB memory, 12 pages   2013年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Bubble-induced pseudo turbulence in laminar pipe flows 査読

    Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW   40   97 - 105   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    Turbulence intensities and Reynolds stresses of bubble-induced pseudo turbulence in air-water laminar bubbly flows in a vertical pipe of 20 mm diameter are measured at a low liquid Reynolds number, Re = 900. A pipe made of fluorinated ethylene propylene resin, which has the same refractive index as water, is utilized to enable the LDV measurement of Reynolds stresses. Experimental data show that (1) turbulence kinetic energy of bubble-induced turbulence is proportional to local void fraction, (2) the ratio among axial, radial and azimuthal components of turbulence intensity is 2:1:1, (3) Sato's eddy viscosity model underestimates the Reynolds shear stress of bubble-induced pseudo turbulence, whereas it qualitatively well represents the Reynolds stress distribution, (4) the Reynolds shear stress of bubble-induced turbulence depend not only on velocity gradient but also on gradient of void fraction and (5) the dissipation process of bubble-induced turbulence is analogous to that of shear-induced turbulence. (C) 2013 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.ijheatfluidflow.2013.01.004

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  • Development of a submersible small fiber LDV probe and its application to flows in a 4 × 4 rod bundle 査読

    Shigeo Hosokawa, Ikumi Mikihara, Akio Tomiyama

    Nuclear Engineering and Design   263   342 - 349   2013年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Optical measurement is an effective and accurate method to understand flow structures of multiphase flows. However, we frequently encounter difficulty in optical access due to the presence of interface and the complex geometry of a flow field. In the present study, we have developed small LDV optics to avoid the difficulty in optical access by installing the LDV probe into a channel component or by submerging the LDV probe into a flow field. The developed LDV optics consists of a manipulator and the probe. The manipulator splits a beam emitted from an Ar-ion laser into four beams. Each beam is introduced into an optical fiber through beam adjustment optics, and is transmitted to the probe through the fiber. The diameter of the probe is 7 mm. The laser beams emitted from the fibers in the probe are focused by a front lens of the probe and form a measurement volume. Scattered light from tracer particles are received by the probe and collected into a receiving fiber installed in the probe. The developed system is applied to laminar and turbulent flows in a rectangular duct for validation. Comparisons with a conventional LDV system show that the accuracy and reliability of the developed system are the same level as the conventional system. The application of the developed system to single-phase and bubbly flows in a 4 × 4 rod bundle demonstrates that the system has a large potential of measuring single-phase and multiphase flows in a channel with a complex geometry. © 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nucengdes.2013.06.009

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  • Onset of Slugging of Stagnant Liquid at a V-Shaped Elbow in a Pipeline: Experiment and Numerical Simulation 査読

    IRIKURA Motoki, MAEKAWA Munenori, HOSOKAWA Shigeo, TOMIYAMA Akio

    Ninth International Conference on Computational Fluid Dynamics in the Minerals and Process Industries   2012年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Counter-Current Flow Limitation at Lower Ends of Vertical Pipes 査読

    DOI Taiga, FUJII Yuki, KAWASAKI Ikuo, MURASE Michio, HOSOKAWA Shigeo, TOMIYAMA Akio

    8th Japan-Korea Symposium on Nuclear Thermal Hydraulics ans Safty (NTHAS-8)   USB Memory   2012年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Application of Spatial Filter velocimetry to Bubbly Flows 査読

    HOSOKAWA Shigeo, MATSUMOTO Takaaki, TOMIYAMA Akio

    6th Japanese-European Two-phase Flow Group Meeting   USB Memory   2012年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurements of turbulent flows in a 2 × 2 rod bundle 査読

    HOSOKAWA Shigeo, YAMAMOTO Taishi, OKAJIMA Jun, TOMIYAMA Akio

    Nuclear Engineering and Design   249   2 - 13   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.nucengdes.2011.11.035

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  • Tomographic Spatial Filter Velocimetry for Three-Dimensional Measurement of Fluid Velocity 査読

    HOSOKAWA Shigeo, MATSUMOTO Takaaki, TOMIYAMA Akio

    The 16th Symposium on Applications of Laser Techniques to Fluid Mechanics (Lisbon 2012)   online CD   2012年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Two-phase swirling flow in a barrel of a steam separator 査読

    MIKA Takeshi, MATSUBAYASHI Toshiki, HOSOKAWA Shigeo, TOMIYAMA Akio

    International Journal of Nuclear Safety and Simulation   Vol. 3, No. 2, pp. 124 - 131   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • V字管屈曲部滞溜液の気流によるスラッギング現象に関する研究 査読

    入倉 基樹, 細川 茂雄, 冨山 明男

    日本機械学会論文集   B編, Vol. 78, No. 791, pp. 1292 ( 791 )   1292 - 1301   2012年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Slugging of a stagnant liquid at a V-shaped elbow in a hilly-terrain pipeline is experimentally investigated to obtain information on flow regime and critical conditions of the slugging. According to flow observation using a high-speed camera, the flow is classified into seven flow regimes, i.e. static puddle, wavy puddle, periodic slug flow, periodic semi-slug flow, aperiodic semi-slug flow, film flow and pebble flow. The onset of the slugging is well predicted not by the Mishima-Ishii's model, but by the Wallis parameter used for flooding in a pipe. This means that the slugging at the V-shaped elbow is similar to the flooding caused by interfacial shear stress. An empirical correlation based on a modified Wallis parameter is proposed to represent the effects of inclination angle, pipe diameter and fluid properties on the onset of slugging.

    DOI: 10.1299/kikaib.78.1292

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  • Measurements of Bubble Velocity using Spatial Filter Velocimetry 査読

    MATSUMOTO Takaaki, HOSOKAWA Shigeo, TOMIYAMA Akio

    The 16th Symposium on Applications of Laser Techniques to Fluid Mechanics (Lisbon 2012)   online CD   2012年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Spatial filter velocimetry based on time-series particle images 査読

    Shigeo Hosokawa, Akio Tomiyama

    EXPERIMENTS IN FLUIDS   52 ( 6 )   1361 - 1372   2012年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    High accuracy and high spatial resolution are required in measurements of fluid velocity for detailed flow diagnostics. In this study, we proposed spatial filter velocimetry (SFV) based on a frequency analysis of time-series spatially filtered particle images. Since this method can measure velocity from one particle in a measurement region, it enables us to measure the velocity with high accuracy and high spatial resolution. We developed a SFV system and applied it to laminar and turbulent flows in a duct to examine its performance. Comparisons between the velocities measured by SFV and LDV confirmed that SFV accurately measures the mean velocity and turbulent intensity with spatial and temporal resolutions as high as LDV.

    DOI: 10.1007/s00348-011-1259-z

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  • EFFECTS OF SURFACTANT ON THE MOTION OF BUBBLES IN LINEAR SHEAR FLOWS

    HAYASHI, Kosuke, KURIMOTO, Ryo, HOSOKAWA, Shigeo, TOMIYAMA, Akio

    2012 Japan-U.S. seminar on Two-Phase flow Dynamics   USB memory, 10 pages   2012年6月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Numerical Simulation of Mass Transfer From a Taylor Bubble with Shape Oscillation

    HOSODA, Shogo, HAYASHI, Kosuke, HOSOKAWA, Shigeo, TOMIYAMA, Akio

    International Conference on Numerical Methods in Multiphase Flows   No. 7-1   2012年6月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Development of A Submergible Small Fiber LDV for Measuring Complex Multiphase Flows 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Japan-US Seminer on Two-Phase Flow Dynamics 2012   USB   2012年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turbulence kinetic energy budget in bubbly flows in a vertical duct 査読

    Shigeo Hosokawa, Takashi Suzuki, Akio Tomiyama

    EXPERIMENTS IN FLUIDS   52 ( 3 )   719 - 728   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. In this study, a molecular tagging velocimetry based on photobleaching reaction was applied to turbulent bubbly flows with sub-millimeter bubbles in a vertical square duct to examine the applicability of the k-epsilon models to the bubbly flows. Effects of bubbles on TKE budget are discussed and a priori tests of the standard and low Reynolds number k-epsilon models are carried out to examine the applicability of these models to the bubbly flows. The conclusions obtained are as follows: (1) The photobleaching molecular tagging velocimetry is of use for validating turbulence models. (2) The bubbles increase the liquid velocity gradient in the near wall region, and therefore, enhance the production and dissipation rates of TKE. (3) The k-epsilon models can reasonably evaluate the production rate of TKE in the bubbly flows. (4) The modulations of diffusion due to the bubbles have different characteristics from the diffusion enhancement due to shear-induced turbulence. Hence, the k-epsilon models fail in evaluating the diffusion rate in the near wall region in the bubbly flows. (5) The k-epsilon models represent the trends of the production, dissipation, and diffusion rates of epsilon in the bubbly flow, although more accurate experimental data are required for quantitative validation of the epsilon equation.

    DOI: 10.1007/s00348-011-1109-z

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  • 加圧溶解型微細気泡発生装置における気泡径、気泡密度と濁度の関係 査読

    田谷 千尋, 前田 康成, 細川 茂雄, 冨山 明男, 伊藤 良泰, 柴田 尚紀

    混相流   Vol. 25, No. 5, pp. 407 - 414   2012年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Bubble tracking simulation of bubble-induced pseudoturbulence 査読

    Mohd Hatta Bin Mohd Akbar, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    Multiphase Science and Technology   24 ( 3 )   197 - 222   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Bubble tracking simulations of bubbly flows in a rectangular column are carried out to examine the applicability of a bubble tracking method to flows involving the bubble-induced pseudoturbulence. Experimental data of void fraction, mean liquid and bubble velocities, and liquid fluctuation velocity are obtained for validation. As a result, the following conclusions are obtained: (1) The order of liquid fluctuation velocity is similar to that of the bubble relative velocity, and the fluctuation is well scaled in terms of the bubble terminal velocity and the void fraction, as Risso &amp
    Ellingsen suggested [J. Fluid Mech., vol. 440, pp. 235-268, 2001]. (2) The Reynolds shear stress is not produced by the bubble motion when both void fraction and liquid velocity are uniform. (3) The Reynolds stress model proposed by Lopez de Bertodano et al. [Int. J. Multiphase Flow, vol. 20, pp. 805-818, 1994] underestimates the normal stress, whereas the bubble tracking simulation with a spatial resolution comparable to the bubble size gives better predictions than the model. (4) The fluctuation in liquid velocity induced by bubbles is partly resolved with a spatial resolution comparable to the bubble size, and subgrid turbulence models do not have much influence on predictions. (5) Eddy viscosity models would be a reasonable choice to capture the shear-induced turbulence in the near-wall region in bubbletracking simulations with an inevitably insufficient spatial resolution for large eddy simulation. © 2012 by Begell House, Inc.

    DOI: 10.1615/MultScienTechn.v24.i3.20

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  • Countercurrent Flow Limitation at the Junction between the Surge Line and the Pressurizer of a PWR 査読

    Taiga Doi, Takashi Futatsugi, Michio Murase, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS   Vol. 2012, 754724, 10 pages   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORPORATION  

    An experimental study on countercurrent flow limitation (CCFL) in vertical pipes is carried out. Effects of upper tank geometry and water levels in the upper and lower tanks on CCFL characteristics are investigated for air-water two-phase flows at room temperature and atmospheric pressure. The following conclusions are obtained: (1) CCFL characteristics for different pipe diameters are well correlated using the Kutateladze number if the tank geometry and the water levels are the same; (2) CCFL occurs at the junction between the pipe and the upper tank both for the rectangular and cylindrical tanks, and CCFL with the cylindrical tank occurs not only at the junction but also inside the pipe at high gas flow rates and small pipe diameters; (3) the flow rate of water entering into the vertical pipe at the junction to the rectangular upper tank is lower than that to the cylindrical tank because of the presence of low frequency first-mode sloshing in the rectangular tank; (4) increases in the water level in the upper tank and in the air volume in the lower tank increase water penetration into the pipe, and therefore, they mitigate the flow limitation.

    DOI: 10.1155/2012/754724

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  • Countercurrent Air-Water Flow in a Scale-Down Model of a Pressurizer Surge Line 査読

    Takashi Futatsugi, Chihiro Yanagi, Michio Murase, Shigeo Hosokawa, Akio Tomiyama

    SCIENCE AND TECHNOLOGY OF NUCLEAR INSTALLATIONS   Vol. 2012, Article ID 174838,   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORP  

    Steam generated in a reactor core and water condensed in a pressurizer form a countercurrent flow in a surge line between a hot leg and the pressurizer during reflux cooling. Characteristics of countercurrent flow limitation (CCFL) in a 1/10-scale model of the surge line were measured using air and water at atmospheric pressure and room temperature. The experimental results show that CCFL takes place at three different locations, that is, at the upper junction, in the surge line, and at the lower junction, and its characteristics are governed by the most dominating flow limitation among the three. Effects of inclination angle and elbows of the surge line on CCFL characteristics were also investigated experimentally. The effects of inclination angle on CCFL depend on the flow direction, that is, the effect is large for the nearly horizontal flow and small for the vertical flow at the upper junction. The presence of elbows increases the flow limitation in the surge line, whereas the flow limitations at the upper and lower junctions do not depend on the presence of elbows.

    DOI: 10.1155/2012/174838

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  • Bubble tracking simulation of bubble-induced pseudoturbulence 査読

    Mohd Hatta Bin Mohd Akbar, Kosuke Hayashi, Shigeo Hosokawa, Akio Tomiyama

    Multiphase Science and Technology   24 ( 3 )   197 - 222   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Begell house  

    Bubble tracking simulations of bubbly flows in a rectangular column are carried out to examine the applicability of a bubble tracking method to flows involving the bubble-induced pseudoturbulence. Experimental data of void fraction, mean liquid and bubble velocities, and liquid fluctuation velocity are obtained for validation. As a result, the following conclusions are obtained: (1) The order of liquid fluctuation velocity is similar to that of the bubble relative velocity, and the fluctuation is well scaled in terms of the bubble terminal velocity and the void fraction, as Risso &amp
    Ellingsen suggested [J. Fluid Mech., vol. 440, pp. 235-268, 2001]. (2) The Reynolds shear stress is not produced by the bubble motion when both void fraction and liquid velocity are uniform. (3) The Reynolds stress model proposed by Lopez de Bertodano et al. [Int. J. Multiphase Flow, vol. 20, pp. 805-818, 1994] underestimates the normal stress, whereas the bubble tracking simulation with a spatial resolution comparable to the bubble size gives better predictions than the model. (4) The fluctuation in liquid velocity induced by bubbles is partly resolved with a spatial resolution comparable to the bubble size, and subgrid turbulence models do not have much influence on predictions. (5) Eddy viscosity models would be a reasonable choice to capture the shear-induced turbulence in the near-wall region in bubbletracking simulations with an inevitably insufficient spatial resolution for large eddy simulation. © 2012 by Begell House, Inc.

    DOI: 10.1615/MultScienTechn.v24.i3.20

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  • Evaluation of Turbulence Kinetic Energy Budget in Turbulent Flows by using a Photobleaching Molecular Tagging Velocimetry 査読

    H. Mizumoto, S. Hosokawa, T. Suzuki, A. Tomiyama

    7TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1428   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. Simultaneous measurement of velocity and velocity gradients with spatial resolution smaller than the Kolmogorov scale is required to evaluate the TKE budget experimentally. We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. Although the accuracy of measured velocity and velocity gradients were examined in the previous study, the accuracy of the TKE budget has not been examined yet due to lack of information on the TKE budget. In this study, we measure TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number condition as DNS data provided by Iwamoto, and compare the measured data with the DNS data to validate PB-MTV for evaluation of TKE budget. The photobleaching is an irreversible photodegradation of a fluorescent dye induced by intense illumination. Uranin (fluoresceine sodium salt) is used for the fluorescent dye which is photobleached by an intense laser beam (wave length lambda = 488.0 nm) to form a molecular tag. Velocity and velocity gradients are evaluated from translation and deformation of the molecular tag between two consecutive images with a time interval delta t, respectively. The size of the tag is about 40 to 100 micrometers, and smaller than the Kolmogorov scale in the turbulent flow. The cross-section and length of the duct are 50x50 mm and 1.6 m, respectively. The measured result indicates that the TKE budget evaluated by PB-MTV agrees well with the DNS data. The PB-MTV is also applied to turbulent bubbly flows in the square duct.

    DOI: 10.1063/1.3694718

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  • SPATIAL FILTER VELOCIMETRY BASED ON TIME-SERIES PARTICLE IMAGES 査読

    Shigeo Hosokawa, Hiroki Sakamoto, Akio Tomiyama

    FLUID MEASUREMENTS AND INSTRUMENTATION CAVITATION AND MULTIPHASE FLOW ADVANCES IN FLUIDS ENGINEERING EDUCATION MICROFLUIDICS, VOL 2   USB Memory   39 - 46   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    High spatial and temporal resolutions are required in velocity measurements for turbulent flows to examine turbulence characteristics accurately. In this study, we proposed a spatial filter velocimetry (SFV) based on a frequency analysis of time-series spatially-filtered particle images. Since this method can measure velocity from one particle in a measurement region, it enables us to measure the velocity with high spatial and temporal resolutions. We developed a SFV system and applied it to laminar and turbulent flows in a duct to examine its performance. Through comparisons between the velocities measured by SFV and LDV, we confirmed that SFV accurately measures the mean velocity and turbulent intensity with spatial and temporal resolutions as high as LDV.

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  • Size Distributions of Micro-bubbles Generated by a Pressurized Dissolution Method 査読

    C. Taya, Y. Maeda, S. Hosokawa, A. Tomiyama, Y. Ito

    7TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1428   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Size of micro-bubbles is widely distributed in the range of one to several hundreds micrometers and depends on generation methods, flow conditions and elapsed times after the bubble generation. Although a size distribution of micro-bubbles should be taken into account to improve accuracy in numerical simulations of flows with micro-bubbles, a variety of the size distribution makes it difficult to introduce the size distribution in the simulations. On the other hand, several models such as the Rosin-Rammler equation and the Nukiyama-Tanazawa equation have been proposed to represent the size distribution of particles or droplets. Applicability of these models to the size distribution of micro-bubbles has not been examined yet. In this study, we therefore measure size distribution of micro-bubbles generated by a pressurized dissolution method by using a phase Doppler anemometry (PDA), and investigate the applicability of the available models to the size distributions of micro-bubbles. Experimental apparatus consists of a pressurized tank in which air is dissolved in liquid under high pressure condition, a decompression nozzle in which micro-bubbles are generated due to pressure reduction, a rectangular duct and an upper tank. Experiments are conducted for several liquid volumetric fluxes in the decompression nozzle. Measurements are carried out at the downstream region of the decompression nozzle and in the upper tank. The experimental results indicate that (1) the Nukiyama-Tanasawa equation well represents the size distribution of micro-bubbles generated by the pressurized dissolution method, whereas the Rosin-Rammler equation fails in the representation, (2) the bubble size distribution of micro-bubbles can be evaluated by using the Nukiyama-Tanasawa equation without individual bubble diameters, when mean bubble diameter and skewness of the bubble distribution are given, and (3) an evaluation method of visibility based on the bubble size distribution and bubble number density is proposed, and the evaluated visibility agrees well with the visibility measured in the upper tank.

    DOI: 10.1063/1.3694707

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  • Size Distributions of Micro-bubbles Generated by a Pressurized Dissolution Method 査読

    C. Taya, Y. Maeda, S. Hosokawa, A. Tomiyama, Y. Ito

    7TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1428   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Size of micro-bubbles is widely distributed in the range of one to several hundreds micrometers and depends on generation methods, flow conditions and elapsed times after the bubble generation. Although a size distribution of micro-bubbles should be taken into account to improve accuracy in numerical simulations of flows with micro-bubbles, a variety of the size distribution makes it difficult to introduce the size distribution in the simulations. On the other hand, several models such as the Rosin-Rammler equation and the Nukiyama-Tanazawa equation have been proposed to represent the size distribution of particles or droplets. Applicability of these models to the size distribution of micro-bubbles has not been examined yet. In this study, we therefore measure size distribution of micro-bubbles generated by a pressurized dissolution method by using a phase Doppler anemometry (PDA), and investigate the applicability of the available models to the size distributions of micro-bubbles. Experimental apparatus consists of a pressurized tank in which air is dissolved in liquid under high pressure condition, a decompression nozzle in which micro-bubbles are generated due to pressure reduction, a rectangular duct and an upper tank. Experiments are conducted for several liquid volumetric fluxes in the decompression nozzle. Measurements are carried out at the downstream region of the decompression nozzle and in the upper tank. The experimental results indicate that (1) the Nukiyama-Tanasawa equation well represents the size distribution of micro-bubbles generated by the pressurized dissolution method, whereas the Rosin-Rammler equation fails in the representation, (2) the bubble size distribution of micro-bubbles can be evaluated by using the Nukiyama-Tanasawa equation without individual bubble diameters, when mean bubble diameter and skewness of the bubble distribution are given, and (3) an evaluation method of visibility based on the bubble size distribution and bubble number density is proposed, and the evaluated visibility agrees well with the visibility measured in the upper tank.

    DOI: 10.1063/1.3694707

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  • Evaluation of Turbulence Kinetic Energy Budget in Turbulent Flows by using a Photobleaching Molecular Tagging Velocimetry 査読

    H. Mizumoto, S. Hosokawa, T. Suzuki, A. Tomiyama

    7TH INTERNATIONAL SYMPOSIUM ON MEASUREMENT TECHNIQUES FOR MULTIPHASE FLOWS   1428   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. Simultaneous measurement of velocity and velocity gradients with spatial resolution smaller than the Kolmogorov scale is required to evaluate the TKE budget experimentally. We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. Although the accuracy of measured velocity and velocity gradients were examined in the previous study, the accuracy of the TKE budget has not been examined yet due to lack of information on the TKE budget. In this study, we measure TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number condition as DNS data provided by Iwamoto, and compare the measured data with the DNS data to validate PB-MTV for evaluation of TKE budget. The photobleaching is an irreversible photodegradation of a fluorescent dye induced by intense illumination. Uranin (fluoresceine sodium salt) is used for the fluorescent dye which is photobleached by an intense laser beam (wave length lambda = 488.0 nm) to form a molecular tag. Velocity and velocity gradients are evaluated from translation and deformation of the molecular tag between two consecutive images with a time interval delta t, respectively. The size of the tag is about 40 to 100 micrometers, and smaller than the Kolmogorov scale in the turbulent flow. The cross-section and length of the duct are 50x50 mm and 1.6 m, respectively. The measured result indicates that the TKE budget evaluated by PB-MTV agrees well with the DNS data. The PB-MTV is also applied to turbulent bubbly flows in the square duct.

    DOI: 10.1063/1.3694718

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  • Multiscale Simulation of Dispersed Flow in Bubble Columns

    TOMIYAMA Akio, OJIMA Shinpei, HAYASHI Kosuke, HOSOKAWA Shigeo

    Proc. of 1st International Symposium on Multiscale Multiphase Process Engineering (MMPE)   CD-ROM (6 pages)   2011年10月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Influence of dissolved gas concentration on diameter and number density of micro-bubbles 査読

    Yasunari Maeda, Chihiro Taya, Shigeo Hosokawa, Akio Tomiyama, Yoshihiro Ito, Naoki Shibata

    ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011   1 ( D )   2579 - 2585   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    A micro-bubble generator based on a pressurized dissolution method can generate fine micro-bubbles with a high bubble number density. The mean diameter and the number density of micro-bubbles depend on the concentration of dissolved gas in the upstream region of a decompression nozzle. In this study, the mean diameter and the number density of micro-bubbles in the downstream region of the decompression nozzle are measured by using a phase Doppler anemometry (PDA) to examine effects of the dissolved gas concentration on the mean diameter and the number density of micro-bubbles generated by the pressurized dissolution method. Experiments are conducted for several dissolved gas concentrations in the upstream region of the decompression nozzle under bubble cavitation and sheet cavitation conditions in the decompression nozzle. The experimental results indicate that, (1) influence of the dissolved gas concentration on flow patterns in the decompression nozzle (bubble cavitation and sheet cavitation) is weak, (2) the Sauter mean diameter of micro-bubbles increases as dissolved gas concentration increases, (3) the gradient of Sauter mean diameter with respect to the dissolved gas concentration in a sheet cavitation case is higher than that in a bubble cavitation case, (4) micro-bubbles are generated even when the dissolved gas concentration is lower than the saturated concentration at the atmospheric pressure provided that a sheet cavitation takes place at the nozzle, and (5) the bubble number density increases with the dissolved gas concentration in bubble cavitation cases whereas it does not depend on the concentration in sheet cavitation cases. Copyright © 2011 by ASME.

    DOI: 10.1115/AJK2011-10035

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  • Evaluation of turbulence kinetic energy budget in turbulent flows by using a photobleaching molecular tagging velocimetry 査読

    Hiroki Mizumoto, Shigeo Hosokawa, Akio Tomiyama

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   77 ( 784 )   2263 - 2272   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. Simultaneous measurement of velocity and velocity gradients with a spatial resolution smaller than the Kolmogorov scale is required to evaluate the TKE budget experimentally. We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. In this study, we improved PB-MTV in its processing speed by utilizing GPGPU(General Purpose Graphic Processing Unit) to increase sample number in measurements. We measured TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number as DNS data provided by Horiuchi, and compared the measured data with the DNS data to validate PB-MTV for evaluation of TKE budget. We also measured TKE budget in a bubbly flow in the square duct to examine effects of bubbles on TKE budget. As a result, we found that (1) PB-MTV can accurately evaluate TKE budget in turbulent flows, (2) bubbles affect the production and diffusion rates of TKE and do not affect the dissipation rate so much, and (3) the model proposed by Troshko and Hassan can reasonably estimate the production rate of the bubble-induced pseudo turbulence. © 2011 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaib.77.2263

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  • フォトブリーチング分子タグ法による乱れエネルギ収支の評価 査読

    水本 博貴, 細川 茂雄, 冨山 明男

    日本機械学会論文集   77 ( 784 )   2263 - 2272   2011年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaib.77.2263

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  • 加圧溶解法により生成した微細気泡の気泡径・数密度 査読

    前田 康成, 細川 茂雄, 田谷 千尋, 冨山 明男, 山口 重行, 伊藤 良泰

    混相流   Vol. 24, No. 4, pp. 462-469 ( 4 )   462 - 469   2010年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:THE JAPANESE SOCIETY FOR MULTIPHASE FLOW  

    Effects of liquid volumetric flux <i>J<sub>L</sub></i> and flow pattern in a decompression nozzle on the mean diameter and number density of micro-bubbles generated by using a pressurized dissolution method are experimentally investigated. The bubble diameter and number density are measured by using a phase Doppler anemometry at the exit of the decompression nozzle. The flow pattern in the decompression nozzle was observed by using a high speed camera. The experimental results indicate that the diameter and number density strongly depends on the flow pattern in the decompression nozzle, and their characteristics are classified into three regimes: (1) few bubbles are generated when no cavitation occurs, (2) when bubble cavitation takes place, the mean bubble diameter keeps low values which do not depend on <i>J<sub>L</sub></i> so much and the bubble number density increases with <i>J<sub>L</sub></i>, and (3) the mean bubble diameter increases with <i>J<sub>L</sub></i> whereas the number density does not depend on <i>J<sub>L</sub></i> when flow pattern in the nozzle is sheet cavitation.

    DOI: 10.3811/jjmf.24.462

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    その他リンク: https://jlc.jst.go.jp/DN/JALC/00362111260?from=CiNii

  • Velocity Distributions of Turbulent Flows in a 2x2 rod bundle 査読

    HOSOKAWA Shigeo, OKAJIMA Jun, YAMAMOTO Taishi, TOMIYAMA Akio

    Proc. 2010 ANS Winter Meeting   CD-ROM   2010年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurements of turbulent flows in a 2x2 Rod bundle 査読

    OKAJIMA Jun, HOSOKAWA Shigeo, YAMAMOTO Taishi, TOMIYAMA Akio

    The 8th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operation and Safety (NUTHOS-8)   CD-ROM   2010年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurements of gas-liquid two-phase flows

    HOSOKAWA Shigeo

    Proc. 2nd International Workshop on Advanced Methodologies and Practices or Nuclear Safety & Simulation, Harbin (Invited)   pp. 56-87   2010年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Void Fraction in a Four by Four Rod Bundle Under a Stagnant Condition 査読

    KAMEI Akihiro, HOSOKAWA Shigeo, TOMIYAMA Akio, KINOSHITA Ikuo, MURASE Michio

    Journal of Power and Energy Science   Vol. 4, No. 2, pp. 315-326   2010年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Turbulence Kinetic Energy Budget in Bubbly Flows in a Vertical Duct 査読

    HOSOKAWA Shigeo, SUZUKI Takashi, TOMIYAMA Akio

    Proc. 15th International Symposium on Application of Laser Techniqes to Fluid Mechanics, Lisbon   USB Memory   2010年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effects of Bubbles on Turbulent Flows in Vertical Channels

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. International Conference on Multiphase Flow 2010 (ICMF 2010): Keynote Lecture   USB Memory   2010年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 部分長燃料棒を有するロッドバンドル内気液二相流の圧力損失 査読

    太田 基希, 細川 茂雄, 林 公祐, 冨山 明男

    混相流,   Vol. 23, No. 5, pp. 547-554   2010年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3811/jjmf.23.547

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  • Effects of bubbles on turbulence properties in a duct flow 査読

    Shigeo Hosokawa, Takashi Suzuki, Akio Tomiyama

    Multiphase Science and Technology   22 ( 3 )   211 - 232   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Influence of bubbles on turbulence properties depends on the ratio of bubble size dB to turbulence length scale lt and the ratio of relative velocity VR between bubbles and liquid to turbulence velocity v′. Since most studies on turbulent bubbly flow have been carried out for flows with large dB/lt, little is known regarding the turbulence modulation in bubbly flows with small dB/l t and large VR/v′. Hence, turbulence properties are measured for bubbly flows with small dB/lt and large VR/v′ using a molecular tagging method based on a photobleaching reaction (PB-MTV). This method can measure not only velocity components but also the gradients by making use of the translation and deformation of a tag and enables us to evaluate the turbulence kinetic energy (TKE) budget. The experimental result indicates that the boundary between the linear sublayer and the log region shifts toward the wall by addition of bubbles in the buffer layer. The bubbles migrating toward the vicinity of the wall increase the liquid velocity gradient at the wall, that is, the shear-induced turbulence is enhanced in the near wall region. When the bubble size is comparable to the Kolmogorov scale, the influence of the bubble-induced pseudo turbulence on the TKE budget is not prominent, in spite of the large relative velocity. The expression of eddy viscosity used in the low-Reynolds-number k-ε model is applicable to the bubbly flows in which the bubble-induced pseudo turbulence is not prominent. The expression of eddy viscosity used in the standard k-ε model is also applicable, provided that accurate boundary conditions for frictional velocity, TKE, and dissipation rate of TKE are given. © 2010 by Begell House, Inc.

    DOI: 10.1615/MultScienTechn.v22.i3.30

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  • Effects of bubbles on turbulence properties in a duct flow 査読

    Shigeo Hosokawa, Takashi Suzuki, Akio Tomiyama

    Multiphase Science and Technology   22 ( 3 )   211 - 232   2010年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Influence of bubbles on turbulence properties depends on the ratio of bubble size dB to turbulence length scale lt and the ratio of relative velocity VR between bubbles and liquid to turbulence velocity v′. Since most studies on turbulent bubbly flow have been carried out for flows with large dB/lt, little is known regarding the turbulence modulation in bubbly flows with small dB/l t and large VR/v′. Hence, turbulence properties are measured for bubbly flows with small dB/lt and large VR/v′ using a molecular tagging method based on a photobleaching reaction (PB-MTV). This method can measure not only velocity components but also the gradients by making use of the translation and deformation of a tag and enables us to evaluate the turbulence kinetic energy (TKE) budget. The experimental result indicates that the boundary between the linear sublayer and the log region shifts toward the wall by addition of bubbles in the buffer layer. The bubbles migrating toward the vicinity of the wall increase the liquid velocity gradient at the wall, that is, the shear-induced turbulence is enhanced in the near wall region. When the bubble size is comparable to the Kolmogorov scale, the influence of the bubble-induced pseudo turbulence on the TKE budget is not prominent, in spite of the large relative velocity. The expression of eddy viscosity used in the low-Reynolds-number k-ε model is applicable to the bubbly flows in which the bubble-induced pseudo turbulence is not prominent. The expression of eddy viscosity used in the standard k-ε model is also applicable, provided that accurate boundary conditions for frictional velocity, TKE, and dissipation rate of TKE are given. © 2010 by Begell House, Inc.

    DOI: 10.1615/MultScienTechn.v22.i3.30

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  • J0503-2-1 時系列デジタル画像を用いた空間フィルタ流速計([J0503-2]多次元計測技術の展開と応用(2))

    坂本 博紀, 細川 茂雄, 冨山 明男

    年次大会講演論文集   2010   57 - 58   2010年

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    High spatial and temporal resolutions are required in velocity measurements for turbulent flows to examine turbulence characteristics accurately. In this study, we proposed a spatial filter velocimetry (SFV) based on a frequency analysis of time-series spatially-filtered particle images. Since this method can measure velocity from one particle in a measurement region, it enables us to measure the velocity with high spatial and temporal resolutions. We developed a SFV system and applied it to laminar and turbulent flows in a duct to examine its feasibility. Through comparisons between the velocities measured by SFV and LDV, we confirmed that SFV accurately measures the mean velocity and turbulent intensity with spatial and temporal resolutions as high as LDV.

    DOI: 10.1299/jsmemecjo.2010.7.0_57

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  • W0502-(2) フォトブリーチング分子タグ法による気泡乱流の計測(【W0502】流体計測への光技術の応用,ワークショップ)

    細川 茂雄, 冨山 明夫

    年次大会講演資料集   2010   153 - 154   2010年

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Since the conservation equation of turbulence kinetic energy (TKE) involves correlations among local instantaneous gradients of fluctuating velocities, it is indispensable to measure the velocity gradients as well as the velocity components. The authors developed a molecular tagging method using photobleaching (PB-MTV), which can measure not only velocity but also its gradient by making use of the translation and deformation of a tag. We applied the PB-MTV to turbulent bubbly flows in a square duct. The experimental results indicate that the presence of bubbles increases not only the production rate but also the dissipation rate of TKE. Although the low Reynolds number k-z model well evaluates the production rate of TKE in the bubbly flow, modification of the diffusion term is required for the bubbly flows.

    DOI: 10.1299/jsmemecjsm.2010.9.0_153

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  • CAVITATION IN NOZZLES OF PLAIN ORIFICE ATOMIZERS WITH VARIOUS LENGTH-TO-DIAMETER RATIOS 査読

    Akira Sou, Shigeo Hosokawa, Akio Tomiyama

    ATOMIZATION AND SPRAYS   20 ( 6 )   513 - 524   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:BEGELL HOUSE INC  

    Cavitation in two-dimensional and cylindrical nozzles with various length-to-diameter (L/D) ratios and its effects on liquid jet deformation are investigated by carrying out simultaneous high-speed visualization of the cavitation and jet. The applicability of a modified cavitation number to quantitative prediction of supercavitation formation for nozzles with various LID ratios is also examined. As a result, the following conclusions are obtained. (1) The modified cavitation number a c can predict supercavitation in nozzles of various shapes and L/D ratios. (2) When cavitation length is less than twice the nozzle diameter D, the cavitation length normalized by the diameter (L(cav)/D), rather than by the nozzle length (L(cav)/L), can be expressed as a unique function of sigma(c). (3) Once a cavitation film is formed in long nozzles (L/D &lt;= 4), the cavitation zone suddenly extends to near the exit even for very long nozzles (L/D = 8). (4) In short nozzles (L/D = 2), incipient cavitation consisting of tiny bubbles can reach the vicinity of the exit. However, a hydraulic flip instead of a cavitation film is formed even at a low flow rate. (5) In long nozzles (L/D = 8), hydraulic flip does not occur even at very high flow rates, which is preferable for a plain orifice atomizer. (6) Cavitation clouds are shed and collapse near the exit to induce a large deformation of the discharged jet, not only in moderately long (L/D = 4) but also in shorter and longer nozzles.

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  • 加圧溶解型微細気泡発生法における混入空気泡の発生気泡に及ぼす影響 査読

    細川 茂雄, 田中 健三, 前田 康成, 冨山 明男, 山口 重行, 伊藤 良泰

    日本機械学会論文集   76 ( 765 )   763 - 770   2010年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaib.76.765_763

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  • Application of photobleaching molecular tagging velocimetry to turbulent bubbly flow in a square duct 査読

    Shigeo Hosokawa, Takayuki Fukunaga, Akio Tomiyama

    EXPERIMENTS IN FLUIDS   47 ( 4-5 )   745 - 754   2009年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    To evaluate turbulence energy budget in bubbly flows, an image processing method in a photobleaching molecular tagging velocimetry is improved for accurate evaluation of velocity gradients. Turbulence properties in single-phase and two-phase dilute-bubbly flows in a square duct are measured using the improved method. As a result, the following conclusions are obtained: (1) The axial velocity and axial turbulent intensity measured by the present method agree well with those measured by laser Doppler velocimetry not only for the single-phase flow but also for the dilute-bubbly flow. (2) The present method can measure velocity components and velocity gradients in the vicinity of the wall, and therefore the present method is of great use in understanding the mechanism of turbulence generation and dissipation near the wall. (3) The present method can provide detailed information on turbulence structure such as turbulence kinetic energy budget. (4) Bubbles tend to increase not only the turbulence production but also the turbulence dissipation.

    DOI: 10.1007/s00348-009-0690-x

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  • Numerical Simulation of Bubble Motion about a Grid Spacer in a Rod Bundle 査読

    ZHANG Zheng, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

    Journal of Power and Energy Systems   Vol. 3, No. 2, pp. 393 - 404 ( 2 )   393 - 404   2009年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Numerical simulations based on a three-dimensional two-way bubble tracking method are carried out to predict bubble motions in a square duct with an obstacle and in a two-by-three rod bundle with a grid spacer. Comparisons between measured and predicted bubble motions demonstrate that the two-way bubble tracking method gives good predictions for trajectories of small bubbles in the upstream side of the grid spacer in the rod bundle geometry. The predicted bubble trajectories clearly show that bubbles are apt to migrate toward the rod surface in the vicinity of the bottom of the grid spacer. Analysis of forces acting on the bubbles confirms that pressure gradient force induced by the presence of the spacer is the main cause of the bubble lateral migration toward the rod surface. Motions of steam bubbles at a nominal operating condition of a pressurized water reactor (PWR) are also predicted by using the bubble tracking method, which indicates that steam bubbles also migrate toward the rod surface at the upstream side of the spacer due to the spacer-induced pressure gradient force.

    DOI: 10.1299/jpes.3.393

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  • Dissolution of Carbon Dioxide Bubbles in Clean and Contaminated Systems 査読

    TOMIYAMA, Akio, ABE, Satoru, HAYASHI, Kosuke, HOSOKAWA, Shigeo

    5th EuropeanTwo-Phase Flow Group Meeting   CD-ROM, 9 pages   2009年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Dimensionless Numbers on Cavitation in a Nozzle of a Plain Orifice Atomizer 査読

    SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proceedings of 11th International Conference on Liquid Atomization and Spray Systems (ICLASS 2009)   ICLASS2009-019, pp. 1-7   2009年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Article 査読

    Hironobu Kataoka, Yusuke Shinkai, Shigeo Hosokawa, Akio Tomiyama

    Journal of Engineering for Gas Turbines and Power   131 ( 3 )   2009年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Effects of pick-off ring configuration on the separator performance of a downscaled model of a steam separator for a boiling water nuclear reactor are examined using various types of pick-off rings. The experiments are conducted using air and water. Pressure drops in a barrel and a diffuser and diameters and velocities of droplets at the exit of the barrel are measured using differential pressure transducers and particle Doppler anemometry, respectively. The separator performance does not depend on the shape of the pick-off ring but strongly depends on the width of the gap between the pick-off ring and the barrel wall. The pressure drop in the barrel is well evaluated using the interfacial friction factor for unstable film flows. Carry-under can be estimated using a droplet velocity distribution at the exit of the separator. © 2009 by ASME.

    DOI: 10.1115/1.3078701

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  • 部分長燃料棒を有する4X4ロッドバンドル内水空気系二相流に関する研究 査読

    太田 基希, 亀井 聡広, 水谷 義隆, 細川 茂雄, 冨山 明男

    混相流研究の進展   Vol. IV, pp. 61-68   61 - 68   2009年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:THE JAPANESE SOCIETY FOR MULTIPHASE FLOW  

    Partial length rods (PLR) are used in fuel bundles of BWR to reduce pressure drops in two-phase regions and to optimize the power distribution. Since little is known about effects of PLR on two-phase flows, air-water two-phase flow around PLRs in a four by four rod bundle is visualized by using a high-speed video camera. The experimental apparatus consists of acrylic channel box and transparent rods. Air and water at atmospheric pressure and room temperature are used for the gas and liquid phases, respectively. The ranges of the gas and liquid volume fluxes, <I>J<SUB>G</SUB></I> and <I>J<SUB>L</SUB></I>, are 0.4 < <I>J<SUB>L</SUB></I> < 2.0 m/s and 0.06 < <I>J<SUB>G</SUB></I> < 8.85 m/s, which cover typical two-phase flow patterns appearing in the fuel bundle. As a result, the following conclusions are obtained. (1) In churn flows at high <I>J<SUB>L</SUB></I>, the flow pattern in the downstream of PLR transits to slug flow, and the flow patterns in the surrounding subchannels transit to bubbly flow due to the redistribution of gas flow. (2) In annular flow, the liquid film on the PLR forms a liquid column above the end cap of PLR. Drops are generated by column breakup and deposit on liquid films on the neighboring rods. (3) The liquid film thickness on the surface of neighbor rods facing the PLR increases and it reduces that on their opposite surface in the downstream of PLR.

    DOI: 10.3811/pmfr.4.61

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    その他リンク: https://jlc.jst.go.jp/DN/JALC/00329084262?from=CiNii

  • Swirling Annular Flow in a Steam Separator 査読

    KATAOKA Hironobu, SHINKAI Yusuke, HOSOKAWA Shigeo, TOMIYAMA Akio

    Trans. ASME, Journal of Engineering for Gas Turbines and Power,   Vol. 131, Issue 3, 032904   2009年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Measurement of micro bubbles generated by a pressurized dissolution method 査読

    S. Hosokawa, K. Tanaka, A. Tomiyama, Y. Maeda, S. Yamaguchi, Y. Ito

    Journal of Physics: Conference Series   147   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    Diameters of micro-bubbles are apt to range from about one mm to several-hundred mm, and therefore, it is difficult to measure a correct diameter distribution using a single measurement method. In this study, diameters of bubbles generated by a pressurized dissolution method are measured by using phase Doppler anemometry (PDA) and an image processing method, which is based on the Sobel filter and Hough transform. The diameter distribution and the Sauter mean diameter of micro bubbles are evaluated based on the diameters measured by both methods. Experiments are conducted for several mass flow rates of dissolved gas and of air bubbles entrained in the upstream of the decompression nozzle to examine effects of the entrained bubbles on bubble diameter. As a result, the following conclusions are obtained: (1) Diameter distribution of micro bubbles can be accurately measured for a wide range of diameter by using PDA and the image processing method. (2) The mean diameter of micro-bubbles generated by gasification of dissolved gas is smaller than that generated by breakup of air bubbles entrained in the upstream of the decompression nozzle. (3) The mean bubble diameter increases with the entrainment of air bubbles in the upstream of the decompression nozzle at a constant mass flow rate of dissolved gas. © 2009 IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/147/1/012016

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  • Measurement of micro bubbles generated by a pressurized dissolution method 査読

    S. Hosokawa, K. Tanaka, A. Tomiyama, Y. Maeda, S. Yamaguchi, Y. Ito

    Journal of Physics: Conference Series   147   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    Diameters of micro-bubbles are apt to range from about one mm to several-hundred mm, and therefore, it is difficult to measure a correct diameter distribution using a single measurement method. In this study, diameters of bubbles generated by a pressurized dissolution method are measured by using phase Doppler anemometry (PDA) and an image processing method, which is based on the Sobel filter and Hough transform. The diameter distribution and the Sauter mean diameter of micro bubbles are evaluated based on the diameters measured by both methods. Experiments are conducted for several mass flow rates of dissolved gas and of air bubbles entrained in the upstream of the decompression nozzle to examine effects of the entrained bubbles on bubble diameter. As a result, the following conclusions are obtained: (1) Diameter distribution of micro bubbles can be accurately measured for a wide range of diameter by using PDA and the image processing method. (2) The mean diameter of micro-bubbles generated by gasification of dissolved gas is smaller than that generated by breakup of air bubbles entrained in the upstream of the decompression nozzle. (3) The mean bubble diameter increases with the entrainment of air bubbles in the upstream of the decompression nozzle at a constant mass flow rate of dissolved gas. © 2009 IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/147/1/012016

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  • 下向き閉塞分岐配管に生じる流動と温度変動のメカニズム : 第1報,鉛直分岐配管に生じる流動現象(流体工学,流体機械) 査読

    大厩 徹, 中村 晶, 長谷 正紹, 細川 茂雄, 竹中 信幸

    日本機械学会論文集B編   75 ( 749 )   68 - 76   2009年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaib.75.749_68

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  • Measurement of micro bubbles generated by a pressurized dissolution method 査読

    S. Hosokawa, K. Tanaka, A. Tomiyama, Y. Maeda, S. Yamaguchi, Y. Ito

    Journal of Physics: Conference Series   147   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    Diameters of micro-bubbles are apt to range from about one mm to several-hundred mm, and therefore, it is difficult to measure a correct diameter distribution using a single measurement method. In this study, diameters of bubbles generated by a pressurized dissolution method are measured by using phase Doppler anemometry (PDA) and an image processing method, which is based on the Sobel filter and Hough transform. The diameter distribution and the Sauter mean diameter of micro bubbles are evaluated based on the diameters measured by both methods. Experiments are conducted for several mass flow rates of dissolved gas and of air bubbles entrained in the upstream of the decompression nozzle to examine effects of the entrained bubbles on bubble diameter. As a result, the following conclusions are obtained: (1) Diameter distribution of micro bubbles can be accurately measured for a wide range of diameter by using PDA and the image processing method. (2) The mean diameter of micro-bubbles generated by gasification of dissolved gas is smaller than that generated by breakup of air bubbles entrained in the upstream of the decompression nozzle. (3) The mean bubble diameter increases with the entrainment of air bubbles in the upstream of the decompression nozzle at a constant mass flow rate of dissolved gas. © 2009 IOP Publishing Ltd.

    DOI: 10.1088/1742-6596/147/1/012016

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  • Multi-fluid simulation of turbulent bubbly pipe flows 査読

    Shigeo Hosokawa, Akio Tomiyama

    Chemical Engineering Science   64 ( 24 )   5308 - 5318   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Radial distributions of void fraction αG, bubble aspect ratio E, phasic velocities VG and VL and turbulent kinetic energy k in bubbly pipe flows are measured using an image processing method and a laser Doppler velocimetry. Multi-fluid simulations are conducted to examine applicability of state-of-the-art closure relations to the turbulent bubbly pipe flows. The experimental results indicate that aspect ratio of bubbles in the near wall region takes a higher value than that of free rising bubbles due to the presence of wall, and that the change in the aspect ratio induces decrease in relative velocity between bubbles and liquid in the near wall region. Drag coefficient CD of a bubble in a bubbly pipe flow tends to increase with magnitude of shear flow, and the effect of shear flow on CD is estimated by the correlation proposed by Legendre and Magnaudet (1998). Comparison between the simulated and the measured results indicate that the effects of bubble shape and shear flow on drag force acting on bubbles should be taken into account for accurate predictions of bubbly pipe flows. The turbulence models proposed by Lopez de Bertodano et al. (1994) and by Hosokawa and Tomiyama (2004a) give good predictions for turbulence modification caused by bubbles. © 2009 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ces.2009.09.017

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  • PWRホットレグを模擬した矩形流路での気液対向流(1)(流動様式とCCFL特性) 査読

    南 則敏, 西脇 大祐, 片岡 宏庸, 冨山 明男, 細川 茂雄, 村瀬 道雄

    混相流   22巻, 4号, pp. 403-412 ( 4 )   403 - 412   2008年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本混相流学会  

    DOI: 10.3811/jjmf.22.403

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  • Void Fraction in a Four by Four Rod Bundle Under a Stagnant Condition 査読

    KAMEI Akihiro, MIZUTANI Yoshitaka, HOSOKAWA Shigeo, TOMIYAMA Akio, MURASE Michio

    The 7th International Topical Meeting on Nuclear Ractor Thermal Hydraulics, Operation and Safety (NUTHOS-7)   CD-ROM, Paper 155   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Counter-Current Air-Water Flow in a Scale-Down Model of a PWR Hot Leg 査読

    NISHIWAKI Daisuke, TOMIYAMA Akio, HOSOKAWA Shigeo, MINAMI Noritoshi, MURASE Michio

    7th International Topical Meeting on Nuclear Ractor Thermal Hydraulics, Operation and Safety (NUTHOS-7)   CD-ROM, Paper 154   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Ligament Formation Induced by Cavitation in a Cylindrical Nozzle 査読

    SOU Akira, Muhammad Ilham Maulana, HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 3, No. 5, pp. 633-644 ( 5 )   633 - 644   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Cavitation in a cylindrical nozzle and liquid jets discharged from the nozzle are simultaneously visualized using a high-speed camera to investigate the mechanism of liquid jet atomization induced by the fully-developed cavitation. Three mirrors are used to capture the front view of liquid jet interfaces and the side view of cavitation clouds within a frame of the camera. The high-speed visualization confirms that the collapse of a cavitation cloud near the nozzle exit induces a ligament formation not only for 2D nozzles but also for cylindrical nozzles. The visualization also finds that the collapse of a large cavitation cloud tends to cause the formation of a large ligament, while that of a small cloud results in a small ligament.

    DOI: 10.1299/jfst.3.633

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  • Effects of Nozzle Geometry on Cavitation in Nozzles of Pressure Atomizer 査読

    SOU Akira, Muhammad Ilham Maulana, ISOZAKI Kenji, HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 3, No. 5, pp. 622-632 ( 5 )   622 - 632   2008年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    The effects of nozzle geometry on cavitation in the nozzle of pressure atomizers and the liquid jet are examined using various two-dimensional (2D) nozzles with different geometries. Then, whether or not the conventional cavitation numbers can be used to predict the formation of supercavitation, in which liquid jet atomization is enhanced, is examined. As a result, we confirm that (1) the thickness of the cavitation zone increases with the ratio <i>C<sub>u</sub></i> of the cross-sectional area upstream of the nozzle to that of the nozzle, (2) the spray angle increases with <i>C<sub>u</sub></i>, (3) the formation of supercavitation can be predicted using the cavitation number σ<sub>c</sub>' in which the effects of the flow contraction and the frictional pressure drop are taken into account, and (4) the conventional cavitation numbers σ, σ<sub>2</sub> and σ<sub>3</sub> cannot predict the formation of supercavitation in nozzles with different geometries.

    DOI: 10.1299/jfst.3.622

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  • Cavitation in a Nozzle of an Atomizer and Its Effects on Liquid Jet 査読

    SOU Akira, Muhammad Ilham Ma, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 5th International Conference on Transport Phenomena in Multiphase Systems   CD-ROM   2008年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurements of Turbulence Properties using Photo Bleaching Molecular Tagging Velocimetry 査読

    HOSOKAWA Shigeo, FUKUNAGA Takayuki, TOMIYAMA Akio

    14th International Symposium on Application of Laser Techniqes to Fluid Mechanics, Lisbon   CD-ROM   2008年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 高気相体積流束の気泡塔流れに及ぼす流入記泡径の影響 査読

    前川 宗則, 宋 明良, 細川 茂雄, 冨山 明男

    日本機械学会論文集   Vol.74, No. 742, Ser. B, pp. 1 ( 742 )   1368 - 1375   2008年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人日本機械学会  

    Effects of inlet bubble diameter on void and bubble size distributions in poly-dispersed bubbly flow in a rectangular bubble column under high gas volumetric flux conditions are experimentally investigated. Three types of gas distributors are used to form bubbly flows with different inlet bubble diameters at a constant gas flow rate. The conclusions obtained are as follows : (1) the bubble size distribution reaches an equilibrium state at which the birth rate of bubbles belonging to a bubble group due to bubble breakup and coalescence is equal to the death rate at high gas volumetric flux, (2) distributions of void fraction and bubble diameter are not affected by inlet bubble diameters except for the region close to the air diffuser, and (3) the elevation at which the bubble size distribution reaches the equilibrium state becomes lower as the gas volumetric flux increases.

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  • 気水分離器内液相分離部の形状が分離性能に及ぼす影響 査読

    片岡 宏庸, 冨山 明男, 細川 茂雄, 宋 明良, 茶木 雅夫

    混相流研究の進展   Vol. 3, pp. 67-74 ( 2008 )   67 - 74   2008年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:THE JAPANESE SOCIETY FOR MULTIPHASE FLOW  

    Air-water two-phase swirling flows in a downscaled model of a steam separator for a boiling water nuclear reactor have been measured while paying attention to the effects of pick-off-ring (POR) shape on separation performance. As a result, the following conclusions are obtained. (1) In an annular swirling flow, the ratio <I>W<SUB>s</SUB><SUP>*</SUP></I> of the separated liquid flow rate to the total liquid flow rate increases with <I>J<SUB>G</SUB></I> and does not depend on <I>J<SUB>L</SUB></I> and POR shape so much. (2) Separation performance becomes lower and does not depend on POR shape so much when the liquid film thickness becomes larger than the size of the gap between the barrel wall and the POR wall. The gap size should be determined so as to be smaller than the maximum film thickness. (3) The POR shape strongly affects the separation performance when the liquid film thickness is smaller than the gap size.

    DOI: 10.3811/pmfr.3.67

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    その他リンク: https://jlc.jst.go.jp/DN/JALC/00322311785?from=CiNii

  • Effects of Water Contamination on Dissolution of a Carbon Dioxide Bubble in a Vertical Pipe 査読

    ABE Satoru, OKAWA Hideaki, HOSOKAWA Shigeo, TOMIYAMA Akio

    Fifth International Conference on Transport Phenomena in Multiphase Systems   2008年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Motion of Single Bubbles near a Grid Spacer in a Two by Three Rod Bundle 査読

    ZHANG Zheng, SUZUKI Kana, HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 3, No. 1, pp. 172-182   2008年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/jfst.3.172

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  • Two-Phase Swirling Flow in a Gas-Liquid Separator 査読

    KATAOKA Hironobu, TOMIYAMA Akio, HOSOKAWA Shigeo, SOU Akira, CHAKI Masao

    Journal of Power and Energy Systems   Vol. 2, No. 4, pp. 1120-1131 ( 4 )   1120 - 1131   2008年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Air-water swirling flows in a one-fifth model of a steam separator in a boiling water nuclear reactor are measured to obtain a database for modeling and verification of numerical methods for predicting swirling flows in the separator. Flow patterns, liquid film thicknesses, separated flow rates and the ratio <i>W<sub>s</sub></i><sup>*</sup> of the separated flow to the total liquid flow are measured using a high-speed camera, a laser focus displacement meter and flowmeters. Main conclusions obtained are as follows: (1) liquid transfer from droplets to liquid film is caused not only by droplet deposition but also by the collection of droplets on the vanes of the swirler, (2) <i>W<sub>s</sub></i><sup>*</sup> increases with the gas volume flux <i>J<sub>G</sub></i> and does not depend on the liquid volume flux <i>J<sub>L</sub></i> so much because a large centrifugal force caused by the swirler makes most of droplets in the gas core deposit on the liquid film before the separation and (3) a local peak appears in the axial distribution of film thickness, the position of which corresponds to the location where the droplet deposition caused by the centrifugal force has completed.

    DOI: 10.1299/jpes.2.1120

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  • EXPERIMENTS ON AIR-WATER COUNTERCURRENT FLOW IN A RECTANGULAR DUCT SIMULATING PWR HOT LEG 査読

    Noritoshi Minami, Daisuke Nishiwaki, Hironobu Kataoka, Akio Tomiyama, Shigeo Hosokawa, Michio Murase

    ICONE16: PROCEEDING OF THE 16TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2008, VOL 3   ICONE16‑48113   127 - 134   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    In the case of loss of the residual heat removal system under mid-loop operation during shutdown of the pressurized water reactor (PWR) plant, steam generated in a reactor core and condensed water in a steam generator (SG) form a countercurrent flow in a hot leg. In this study, in order to improve a counter-current flow model of a transient analysis code, experiments were conducted using a scale-down model of the PWR hot leg, and flow patterns and counter-current flow limitation (CCFL) characteristics were measured. A rectangular duct, whose height is about 1/5(th) of the hot leg diameter, was used to simulate the hot leg, and air and water at atmospheric pressure and room temperature were used for gas and liquid phases.
    In the horizontal section, as air flow rate Q(G) increases, the flow pattern transits from a stratified flow to wavy flow, and then wavy to wavy-mist flow. When the latter transition takes place, water flow from the horizontal duct to the lower tank is to be restricted. Flow patterns in the elbow section are the same as those in the horizontal section. Wavy flow is not formed in the inclined section, where the transition to wavy-mist flow occurs due to the inflow of wavy-mist flow generated in the horizontal section. Flow patterns in the elbow and inclined section are strongly affected by those in the horizontal section.
    CCFL characteristics are well correlated with the Wallis-type correlation, and the onset of CCFL well corresponds to the transition from wavy flow to wavy-mist flow.

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  • MOTION OF SMALL BUBBLES NEAR A GRID SPACER IN A TWO BY THREE ROD BUNDLE 査読

    Zheng Zhang, Kana Suzuki, Shigeo Hosokawa, Akio Tomiyama

    ICONE16: PROCEEDING OF THE 16TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2008, VOL 3   ICONE16‑48468   449 - 457   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Several experiments have reported that departure from nucleate boiling (DNB) in a pressurized water reactor (PWR) fuel assembly often takes place just upstream of a grid spacer. Since DNB inception is to be tightly related with an extremely high void fraction in the vicinity of a heated wall, it is speculated that one of the causes of DNB inception is lateral migration of bubbles toward a fuel rod due to a flow induced by the grid spacer. Therefore, experiments are conducted to investigate the motion of small bubbles and liquid velocity profiles just upstream of a grid spacer in a two by three rod bundle. Tap water and air are used for the liquid and gas phases, respectively. The bulk liquid velocity ranges from 1.0 to 4.0 m/s and experiments are conducted at atmospheric pressure and room temperature. Trajectories of single small bubbles are recorded using a high-speed video camera. Mean liquid velocities and turbulence distributions upstream of the spacer are calculated based on 10,000 instantaneous velocity distributions measured by Particle Image Velocimetry (PIV). Discussion on the effects of the gird spacer on bubble motion is made based on the difference between the measured bubble trajectories and liquid streamlines. Numerical simulations using a three-dimensional two-way bubble tracking method are also carried out. The calculated trajectories of single bubbles and liquid velocity distributions are compared with the measured data. The main conclusions obtained are as follows: (1) just upstream of the grid spacer, bubbles are apt to migrate toward the rods and accumulate in the vicinity of the rod surface, (2) a centrifugal force caused by a curved streamline just upstream of the grid spacer is the main cause of lateral migration of bubbles toward the rods, and (3) the two-way bubble tracking method gives good predictions for trajectories of small bubbles upstream of the grid spacer and for liquid velocity profiles.

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  • SWIRLING ANNULAR FLOW IN A STEAM SEPARATOR 査読

    Hironobu Kataoka, Akira Sou, Shigeo Hosokawa, Akio Tomiyama

    ICONE16: PROCEEDING OF THE 16TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2008, VOL 3   CD-ROM, ICONE16-48077   67 - 74   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Effects of pick-off ring configuration on the separation performance of a downscaled model of a steam separator for a boiling water nuclear reactor are examined using various types of pick-off rings. The experiments are conducted using air and water. Pressure drops in a barrel and a diffuser, and diameters and velocities of droplets at the exit of the barrel are measured using differential pressure transducers and particle doppler anemometry, respectively. As a result, the following conclusions are obtained: (1) the separation performance does not depend on the shape of pick-off ring, but strongly depends on the width of the gap between the pick-off ring and the barrel wall, (2) the pressure drop in the barrel is well evaluated using the interfacial friction factor for unstable film flows, and (3) the radial distribution of droplet velocity at the exit of the separator is of use for the evaluation of carry-under.

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  • 単孔から離脱する気泡の直径 査読

    前川 宗則, 細川 茂雄, 冨山 明男

    日本機械学会論文集   B編, 73巻, 735号, pp. 2220-2226   2007年11月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • (Inveted Lecture) Mechanism of Atomization Enhancement by Cavitation in a Nozzle 招待

    SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. of Annual Conference of Institute for Liquid Atomization and Spray Systems -Korea 2007   pp. 9-14   2007年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effects of cavitation in a nozzle on liquid jet atomization 査読

    Akira Sou, Shigeo Hosokawa, Akio Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER   50 ( 17-18 )   3575 - 3582   2007年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Cavitation in two-dimensional (2D) nozzles and liquid jet in the vicinity of the nozzle exit were visualized using high-speed cameras to investigate the effects of cavitation on liquid jet under various conditions of cavitation and Reynolds numbers sigma and Re. Liquid velocity in the nozzle was measured using a laser Doppler velocimetry to examine the effects of cavitation on the flow in the nozzle and liquid jet. As a result, the following conclusions were obtained: (1) cavitation in the nozzles and liquid jet can be classified into the four regimes: (no cavitation, wavy jet), (developing cavitation, wavy jet), (super cavitation, spray) and (hydraulic flip, flipping jet), (2) liquid jet near the nozzle exit depends on cavitation regime, (3) cavitation and liquid jet are not strongly affected by Re but by a, and (4) strong turbulence induced by the collapse of cavitation clouds near the exit plays an important role in ligament formation. (c) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijheatmasstransfer.2006.12.033

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  • Cavitation in a Nozzle and Its Effects on Liquid Jet Atomization

    SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. Japan-UK Mini-Seminar on Multiphase Flow 2007   CD-ROM, pp. 1-21.   2007年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Two-Phase Swirling Flow in a Gas-Liquid Separator 査読

    KATAOKA Hironobu, TOMIYAMA Akio, HOSOKAWA Shigeo, SOU Akira, CHAKI Masao

    Proc. 6th International Conference on Multiphase Flow   CD-ROM, Paper No. S6_Wed_C_40   2007年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Cavitation in Cylindrical Nozzles and Two-Dimensional Nozzles 査読

    SOU Akira, Muhammad Ilham Maulana, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. International Conference on Multiphase Flow 2007 (ICMF 2007)   CD-ROM, Paper No S4_Mon_C_5   2007年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Multi-Fluid Simulation of Turbulent Bubbly Pipe Flows 査読

    HOSOKAWA Shigeo, SOU Akira, TOMIYAMA Akio

    Proc. International Conference on Multiphase Flow 2007 (ICMF 2007)   CD-ROM, Paper No. S6_Thu_B_52   2007年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Two-phase flow patterns in a four by four rod bundle 査読

    Yoshitaka Mizutani, Akio Tomiyama, Shigeo Hosokawa, Akira Sou, Yoshiro Kudo, Kaichiro Mishima

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   44 ( 6 )   894 - 901   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ATOMIC ENERGY SOC JAPAN  

    Air-water two-phase flow patterns in a four by four square lattice rod bundle consisting of an acrylic channel box of 68 mm in width and transparent rods of 12 mm in diameter were observed by utilizing a high speed video camera, FEP (fluorinated ethylene propylene) tubes for rods, and a fiberscope inserted in a rod. The FEP possesses the same refractive index as water, and thereby, whole flow patterns in the bundle and local flow patterns in subchannels were successfully visualized with little optical distortion. The ranges of gas and liquid volume fluxes, (J(G)) and (J(L)), in the present experiments were 0.1 &lt; (J(L)) &lt; 2.0 m/s and 0.06 &lt; (J(G)) &lt; 8.85 m/s, which covered typical two-phase flow patterns appearing in a fuel bundle of a boiling water nuclear reactor. As a result, the following conclusions were obtained: (1) the region of slug flow in the (J(G))-(J(L)) flow pattern diagram is so narrow that it can be regarded as a boundary between bubbly and chum flows, (2) the boundary between bubbly and chum flows is close to the boundary between bubbly and slug flows of the Mishima and Ishii's flow pattern transition model, and (3) the boundary between churn and annular flows is close to the Mishima and Ishii's model.

    DOI: 10.3327/jnst.44.894

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  • Multi-Fluid and Particle-Tracking Methods for Predicting Poly-Dispersed Flows (Keynote Lecture) 招待 査読

    TOMIYAMA Akio, HOSOKAWA Shigeo, SOU Akira

    Proc. 45th European Two-Phase Flow Group Meeting   p. 2   2007年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 鉛直管内二酸化炭素-水系気液二相流における気泡溶解過程 査読

    阿部 覚, 野澤 聡, 細川 茂雄, 冨山 明男

    混相流研究の進展   Vol. 2, pp. 9-16   2007年4月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3811/pmfr.2.9

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  • 一様せん断流中単一液滴に作用する揚力に関する研究 査読

    小川 耕平, Win Myint, 細川 茂雄, 冨山 明男

    混相流の進展   Vol. 2, pp. 55-62   2007年4月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3811/pmfr.2.55

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  • Shapes of Single Drops Rising Through Stagnant Liquids 査読

    Win Myint, HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 2, No. 1, pp. 184-195 ( 1 )   184 - 195   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Shapes of single drops rising through infinite stagnant liquids under terminal conditions were measured using a high-speed camera for a wide range of fluid properties. Aspect ratios <i>E</i> and distortion factors γ of drops were evaluated from drop images. Effects of initial shape deformation, surfactants and viscosity ratio κ on <i>E</i> and γ were investigated. As a result, the following conclusions were obtained. (1) Initial shape deformation does not affect <i>E</i> and γ of single drops. (2) Addition of surfactants decreases <i>E</i> and breaks the fore-and-aft symmetry of a drop shape especially in systems of low Morton numbers <i>M</i>. (3) The Tadaki number <i>Ta</i> is the best dimensionless number among the Eötvös number <i>Eo</i>, the Weber number <i>We</i> and <i>Ta</i> for correlating <i>E</i> of drops, and an empirical correlation of <i>E</i> in terms of <i>Ta</i> was proposed for clean drops under the conditions of -11.6 ≤ log <i>M</i> ≤ -0.9, 1.5 × 10<sup>-2</sup> ≤ <i>Re</i> ≤ 8.5 × 10<sup>2</sup>, 1.7 × 10<sup>-2</sup> ≤ <i>Eo</i> ≤ 9.3, 7.4 × 10<sup>-3</sup> ≤ <i>Ta</i> ≤ 3.6 and 0.1 ≤ κ ≤ 100. (4) The viscosity ratio κ does not affect <i>E</i> so much but influences γ. For κ > 1, γ decreases with increasing the drop diameter, that is, the front part of a drop is flatter than the rear part. On the contrary, the rear part is flatter than the front part when κ < 1. The fore-and-aft symmetry always holds for drops with κ ∼ 1.0. (5) Various drop shapes were presented as a database utilized for verification of numerical methods such as an interface tracking method and a boundary element method.

    DOI: 10.1299/jfst.2.184

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  • 障害物を含む鉛直ダクト内高速流中における小気泡の運動 査読

    張 政, 細川 茂雄, 片岡 宏庸, 牧野 泰, 冨山 明男

    日本機械学会論文集   B編, 73巻, 725号, pp. 162-168 ( 725 )   162 - 168   2007年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人日本機械学会  

    Several experiments have reported that Departure from Nucleate Boiling (DNB) in a Pressurized Water Reactor (PWR) fuel assembly often takes place in upstream part of a grid spacer, and it was supposed that bubble accumulation induced by flow around an obstacle is one of reasons of the DNB inception. Hence, experiments were conducted to investigate the motion of small bubbles in high-speed flows in a vertical duct containing an obstacle. The bubble trajectories and averaged bubble distributions were measured by an image processing method. The experimental results indicated that small bubbles migrate toward the opposite wall of the obstacle near the upstream edge of the obstacle. The lateral translation of bubbles was larger than that of the liquid phase, which could be induced by the difference in inertia between bubbles and the liquid phase.

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  • A three-dimensional PIV using intensity gradients of a two-color laser beam 査読

    Shigeo Hosokawa, Akio Tomiyama

    Multiphase Science and Technology   19 ( 3 )   269 - 285   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Multiphase flows and turbulent flows are inevitably three-dimensional and, therefore, a three-dimensional three-component PIV (3D3C-PIV), which can measure a three-dimensional distribution of three velocity components in a flow, is required for the understanding of a three-dimensional flow structure. In this study, we developed a 3D3C-PIV by making use of the intensity gradients of a two-color laser beam. The significant features of the present method are (i) a three-dimensional distribution of three velocity components is measurable, (ii) simultaneity in measured vectors is guaranteed perfectly, (iii) the optical system is simple and economical because it does not require scanning optics, high-repetition light sources, and cameras, (iv) the calibration of optical distortion required in a stereoscopic PIV/PTV is not necessary , and (v) the algorithm of image processing is simpler compared with 3D-PTV. Feasibility tests were carried out by applying the developed method to a jet flow and a flow around drops. As a result, the feasibility and potential of the proposed method was confirmed.

    DOI: 10.1615/MultScienTechn.v19.i3.40

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  • Two-phase flow patterns in a four by four rod bundle 査読

    Yoshitaka Mizutani, Akio Tomiyama, Shigeo Hosokawa, Akira Sou, Yoshiro Kudo, Kaichiro Mishima

    Journal of Nuclear Science and Technology   44 ( 6 )   894 - 901   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Air-water two-phase flow patterns in a four by four square lattice rod bundle consisting of an acrylic channel box of 68mm in width and transparent rods of 12mm in diameter were observed by utilizing a high speed video camera, FEP (fluorinated ethylene propylene) tubes for rods, and a fiberscope inserted in a rod. The FEP possesses the same refractive index as water, and thereby, whole flow patterns in the bundle and local flow patterns in subchannels were successfully visualized with little optical distortion. The ranges of gas and liquid volume fluxes, (JG) and (JL), in the present experiments were 0:1 ≪ (JL) &lt
    2:0 m/s and 0:06 &lt
    (JG) &lt
    8:85 m/s, which covered typical two-phase flow patterns appearing in a fuel bundle of a boiling water nuclear reactor. As a result, the following conclusions were obtained: (1) the region of slug flow in the (JG)-(JL) flow pattern diagram is so narrow that it can be regarded as a boundary between bubbly and churn flows, (2) the boundary between bubbly and churn flows is close to the boundary between bubbly and slug flows of the Mishima and Ishii’s flow pattern transition model, and (3) the boundary between churn and annular flows is close to the Mishima and Ishii’s model. © 2007 Taylor and Francis Group, LLC.

    DOI: 10.1080/18811248.2007.9711327

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  • Mass Transfer in Carbon Dioxide - Water Bubbly Pipe Flow (Keynote Lecture)

    TOMIYAMA Akio, ABE Satoru, HOSOKAWA Shigeo

    Proc. 18th Int. Symp. Transport Phenomena   pp.215-223   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Dissolution of a carbon dioxide bubble in a vertical pipe 査読

    Satoru Abe, Hideaki Okawa, Shigeo Hosokawa, Akio Tomiyama

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B   CD-ROM, Paper No.FEDSM2007-374   285 - 290   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Dissolution of single carbon dioxide (CO2) bubbles in a vertical pipe of 25 mm in diameter are measured to examine the effects of the ratio lambda of sphere-volume equivalent bubble diameter d to pipe diameter D, liquid Reynolds number Re-L and surfactants on mass transfer. The bubble diameter d and Reynolds number Re-L are varied from 5.0 to 26 mm (lambda = 0.20-1.0) and from 0 to 3100, respectively. Millipore water, tap water and water contaminated with Triton X-100 are used for the liquid phase. Mass transfer coefficients k(L) are evaluated from changes in d. The k(L) decreases with increasing lambda for bubbles in stagnant millipore water because of the decrease in bubble rising velocity due to the wall effect. Measured Sherwood numbers Sh do not depend on Re-L because a turbulent fluctuation velocity in bulk liquid flow is Much smaller than a relative velocity between a bubble and liquid. The mass transfer correlation for a bubble in a stagnant liquid proposed by Johnson et at. is applicable to a bubble in pipe flow, provided that a correct relative velocity between a bubble and liquid is substituted in the correlation. Due to the retardation of capillary wave, mass transfer coefficients for bubbles in contaminated water becomes smaller than those in millipore and tap waters.

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  • Motion of single drops in linear shear flows 査読

    Win Myint, Shigeo Hosokawa, Akio Tomiyama

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B   CD-ROM, Paper No.FEDSM2007-374   303 - 308   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Motions of single silicon oil drops rising in linear shear flows of glycerol-water solutions are measured to investigate the effects of the viscosity ratio kappa and dimensionless shear rate Sr on drag forces under the conditions of -6.3 &lt;= logM &lt;= -4.8, 0.94 &lt;= kappa &lt;= 7.04, 1 &lt; Re &lt;= 23 and 3.2 &lt;= omega &lt;= 6.0 s(-1), where M is the Morton number and omega the magnitude of the velocity gradient of the continuous phase. As a result, we confirmed that (1) the drag coefficient C-D of a drop in a linear shear flow takes a higher value than the drag coefficient CD of the same-size drop in a stagnant liquid, (2) C-D/C-D0 increases with Sr, and (3) the augmentation of C-D becomes large as kappa increases.

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  • Dissolution of a carbon dioxide bubble in a vertical pipe 査読

    Satoru Abe, Hideaki Okawa, Shigeo Hosokawa, Akio Tomiyama

    FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B   Vol. 3, No. 5, pp. 667-677   285 - 290   2007年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER SOC MECHANICAL ENGINEERS  

    Dissolution of single carbon dioxide (CO2) bubbles in a vertical pipe of 25 mm in diameter are measured to examine the effects of the ratio lambda of sphere-volume equivalent bubble diameter d to pipe diameter D, liquid Reynolds number Re-L and surfactants on mass transfer. The bubble diameter d and Reynolds number Re-L are varied from 5.0 to 26 mm (lambda = 0.20-1.0) and from 0 to 3100, respectively. Millipore water, tap water and water contaminated with Triton X-100 are used for the liquid phase. Mass transfer coefficients k(L) are evaluated from changes in d. The k(L) decreases with increasing lambda for bubbles in stagnant millipore water because of the decrease in bubble rising velocity due to the wall effect. Measured Sherwood numbers Sh do not depend on Re-L because a turbulent fluctuation velocity in bulk liquid flow is Much smaller than a relative velocity between a bubble and liquid. The mass transfer correlation for a bubble in a stagnant liquid proposed by Johnson et at. is applicable to a bubble in pipe flow, provided that a correct relative velocity between a bubble and liquid is substituted in the correlation. Due to the retardation of capillary wave, mass transfer coefficients for bubbles in contaminated water becomes smaller than those in millipore and tap waters.

    DOI: 10.1299/jfst.3.667

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  • 超高出力密度炉心ABWRプラントの実用化に向けた技術開発(II)—(5)気水分離器内流動特性評価試験

    片岡 宏庸, 西脇 大祐, 冨山 明男, 細川 茂雄, 宋 明良, 茶木 雅夫

    日本原子力学会 年会・大会予稿集   2007s   236 - 236   2007年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本原子力学会  

    気水分離器模擬装置を製作し, 旋回二相流流動特性把握を目的とした各種計測を実施し, 液滴及び液膜の流動特性と, スワラーおよびピックオフリングによる気液分離特性を調べた.

    DOI: 10.11561/aesj.2007s.0.236.0

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  • Motion of Small Bubbles near an Obstacle Placed in a Square Duct 査読

    ZHENG Zhang, SUZUKI Kana, MAKINO Yaushi, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 5th International Symposium on Measurement Techniques for Multiphase Flows (5th ISMTMF)   Vol. 1, pp. 45-50   2006年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A Three-Dimensional PIV using Intensity Gradients of a Two-Color Laser Beam 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, SAJI Akihiro

    5th International Symposium on Measurement Techniques for Multiphase Flows (5th ISMTMF)   Vol. 1, pp. 518-525   2006年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Cavitation in a two-dimensional nozzle and liquid jet atomization - (LDV measurement of liquid velocity in a nozzle) 査読

    Akira Sou, Akio Tomiyama, Shigeo Hosokawa, Shinji Nigorikawa, Tatsutoshi Maeda

    JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING   49 ( 4 )   1253 - 1259   2006年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    Cavitation in nozzles of liquid injectors is known to affect the atomization of a discharged liquid jet. To understand how cavitating How in a nozzle enhances the liquid jet atomization, liquid velocity distribution of cavitating flow in a two-dimensional transparent nozzle was measured using a Laser Doppler Velocimetry (LDV) system. As a result, the following conclusions were obtained: (1) The inception of cavitation occurs near the outer edge of separated boundary layer (SBL), where the time-averaged local velocity takes the highest value and the time-averaged pressure is almost equal to the vapor saturation pressure. (2) When the cavitation number sigma is greater than 0.78 (in no cavitation and developing cavitation regimes), the reattachment of SBL occurs in the middle of the nozzle. A large velocity fluctuation, which appears just downstream of SBL, decreases near the nozzle exit. Hence the wavy jet is formed in these regimes. (3) For sigma &lt;= 0.65 (in super cavitation regime), the lateral flow directing from the core region toward the side walls just upstream of the nozzle exit is a major cause of the increase in the spray angle and drastic enhancement of liquid jet atomization. The strong turbulence just upstream of the exit must play an important role in the formation of ligaments on liquid jet interface.

    DOI: 10.1299/jsmeb.49.1253

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  • Effects of Bubble Wake on Coalescence Between Planar Bubbles 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 1, No. 2, pp. 94-104 ( 2 )   94 - 104   2006年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Coalescence of two planar air bubbles in stagnant water filled in two parallel plates was experimentally investigated. To examine the effects of bubble wake on coalescence, the bubble diameter, initial vertical and horizontal distances between two bubbles were chosen as experimental parameters. The vertical distance <i>x</i> from the bubble release point, at which coalescence took place, was measured. The number of coalesced bubble pairs was counted for about 100 bubble pairs, and the coalescence probability was calculated as the ratio of the number of the coalesced bubble pairs to that of the total bubble pairs. With decreasing the bubble diameter or with increasing the initial distance between two bubbles, the mean vertical distance <i>x</i> increased and the coalescence probability decreased. There was a strong correlation between the distribution of coalescence probability and that of bubble wake velocity, i.e. the wake structure does play a significant role in the bubble coalescence process and affects the coalescence probability.

    DOI: 10.1299/jfst.1.94

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  • A Three-Dimensional PIV using Intensity Gradients of a Two-Color Laser Beam 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    4th Europien-Japanese Two-Phase Flow Group Meeting   CD-ROM   2006年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Terminal Velocities of Single Drops in Stagnant Liquids 査読

    Win Myint, HOSOKAWA Shigeo, TOMIYAMA Akio

    Journal of Fluid Science and Technology   Vol. 1, No. 2, pp. 72-81 ( 2 )   72 - 81   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    Terminal velocities of single drops rising through infinite stagnant liquids under wide ranges of fluid properties were measured to examine the effects of initial shape deformation, surfactants and the viscosity ratio. As a result, the following conclusions were obtained: (1) the terminal velocity <i>V<sub>T</sub></i> of a drop is not affected by initial shape deformation due to strong viscous damping of shape oscillation, (2) the drop drag coefficient <i>C<sub>D</sub></i> is a function of the drop Reynolds number <i>Re</i>, the viscosity ratio κ and surfactant concentration, (3) surfactants increase <i>C<sub>D</sub></i> and the influence of surfactants on <i>C<sub>D</sub></i> becomes weaker as κ increases, which is consistent with the Levich's drag model, (4) the effect of κ on <i>C<sub>D</sub></i> can be evaluated by the factor in the Levich's model, [(2+3κ)/(1+κ)], even at intermediate drop <i>Re</i> numbers, and (5) the combination of the Levich's model and Schiller & Nauman's correlation gives good estimation of <i>C<sub>D</sub></i> of single drops in clean and fully contaminated systems under the conditions of -11.6 <log<sub>10</sub><i>M</i> < -0.9, 1.7×10<sup>-1</sup> < <i>Re</i> < 2×10<sup>2</sup>, 1.7×10<sup>-2</sup> < <i>Eo</i> < 12.1 and 0.1 < κ < 100.

    DOI: 10.1299/jfst.1.72

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  • Effects of Cavitation in a Nozzle on Liquid Jet Atomization 査読

    SOU Akira, Muhammad Ilham Maulana, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 10th International Conference on Liquid Atomization and Spray Systems (ICLASS 2006)   CD-ROM, ICLASS06-043, pp. 1-7   2006年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • キャビテーション数とレイノルズ数が2次元ノズル内キャビテーションに及ぼす影響 査読

    宋 明良, Muhammad Ilham Maulana, 細川 茂雄, 冨山 明男

    混相流研究の進展   Vol. 1, pp. 65-70   2006年4月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3811/pmfr.1.65

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  • 2次元ノズル内キャビテーションと液体噴流の微粒化(第1報,超高速度カメラによる可視化) 査読

    宋 明良, 冨山 明男, 細川 茂雄, 濁川 慎司, 松本 洋一郎

    日本機械学会論文集(B編)   Vol. 72, No. 714, pp. 513-520. ( 714 )   513 - 520   2006年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人日本機械学会  

    Cavitation and internal flow in the nozzle of a liquid injector are known to affect the atomization of a discharged liquid jet. In the present study cavitation in a two-dimensional (2D) nozzle and the injected water jet were visualized using an ultra high-speed camera. As a result, the following conclusions were obtained: (1) The behavior of cavitation in the 2D nozzle and liquid jet agreed qualitatively with the previous observations of cylindrical nozzles. (2) When the cavitation number σ was 1.18, the inception of small cavitation bubbles was observed near the nozzle inlet apart from the side wall. (3) The number of cavitation bubble clouds increased with decreasing of σ (0.75&ge;σ<1.18), and the streamwise length of the cavitation region increased toward the middle of the nozzle (developing cavitation). The bubble clouds were clearly observed to recirculate in the separated boundary layer. In the case a wavy jet was observed with no significant effects of cavitation on liquid jet atomization. (4) With a slight decrease of σ from 0.75, the cavitation region suddenly extended to the nozzle exit (super cavitation). The shape of the cavitation region near the inlet became smooth, which imply the formation of a long cavitation bubble near the inlet. At the downstream half of the nozzle, clouds of cavitation appeared and collapsed intermittently within the nozzle. In the case atomization was promoted to form spray with ligaments and droplets.

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  • 2次元ノズル内キャビテーションと液体噴流の微粒化(第2報,ノズル内液相速度のLDV計測) 査読

    宋 明良, 冨山 明男, 細川 茂雄, 濁川 慎司, 前田 達利

    日本機械学会論文集(B編)   Vol. 72, No. 714, pp. 521-527 ( 714 )   521 - 527   2006年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人日本機械学会  

    Cavitation and internal flow in the nozzle of a liquid injector are known to affect the atomization of a discharged liquid jet. In order to obtain the knowledge on the mechanism how cavitating flow in a nozzle enhances the liquid jet atomization, liquid velocity distributions of cavitating flows in a two dimensional transparent nozzle were measured using a Laser Doppler Velocimetry (LDV) system. As a result, the following conclusions were obtained: (1) The inception of cavitation occurs near the outer edge of the separated boundary layer (SBL), where the mean local velocity takes the highest value and the mean pressure is lower than the vapor saturation pressure. (2) When the cavitation number σ&ge;0.78 (No Cavitation or Developing Cavitation), the reattachment of SBL occurs in the middle of the nozzle. A large velocity fluctuation, which appears in and just downstream of SBL, decreases near the nozzle exit. This may be the reason of the wavy jet. (3) When σ&ge;0.65 (Super Cavitation), the lateral flow from the core region toward the side walls just upstream of the nozzle exit may be the major cause of the increase in spray angle and a drastic promotion of liquid jet atomization. The strong turbulence just upstream of the exit may also play a role on the formation of ligaments at liquid jet interface.

    CiNii Books

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  • B306 密度分布を有する流れ場の数値計算手法検証 査読

    宋 明良, 前田 章善, 細川 茂雄, 冨山 明男

    可視化情報学会誌   26 ( 1 )   301 - 302   2006年

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    記述言語:日本語   出版者・発行元:社団法人 可視化情報学会  

    To verify the validity of a numerical method to predict multi-phase dispersed flows of which the density varies with fluid temperature and solute concentration, solute concentration and velocity distributions of a salt water flow were measured using an imaging technique. The aspect ratio and rising velocity of a single drop in a density stratified salt water were also measured. Calculated results of these flows agreed well with the measured results.

    DOI: 10.3154/jvs.26.Supplement1_301

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  • Effects of Inlet Bubble Size on Poly-Dispersed Bubbly Flow in a Bubble Column 査読

    TOMIYAMA Akio, SOU Akira, HOSOKAWA Shigeo

    Proc. 44th European Two-Phase Flow Group Meeting   pp.1-8   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Two-phase flow patterns in a four by four rod bundle 査読

    Yoshitaka Mizutani, Shigeo Hosokawa, Akio Tomiyama

    International Conference on Nuclear Engineering, Proceedings, ICONE   2006   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Air-water two-phase flow patterns in a four by four square lattice rod bundle consisting of an acrylic channel box of 68 mm in width and transparent rods of 12 mm in diameter were observed by utilizing a high speed video camera, FEP (fluorinated ethylene propylene) tubes for rods, and a fiberscope inserted in a rod. The FEP possesses the same refractive index as water, and thereby, whole flow patterns in the bundle and local flow patterns in subchannels were successfully visualized with little optical distortion. The ranges of liquid and gas volume fluxes, 〈JG〉 and 〈JL〉, in the present experiments were 0.1 &lt
    〈JL〉 &lt
    2.0 mis and 0.04 &lt
    〈JG〉 &lt
    8.85 m/s, which covered typical two-phase flow patterns appearing in a fuel bundle of a boiling water nuclear reactor. As a result, the following conclusions were obtained: (1) the region of slug flow in the 〈JG〉 - 〈JL〉 flow pattern diagram is so narrow that it can be regarded as a boundary between bubbly and churn flows, (2) the boundary between bubbly and churn flows is close to the boundary between bubbly and slug flows of the Mishima &amp
    Ishii's flow pattern transition model, and (3) the boundary between churn and annular flows is well predicted by the Mishima &amp
    Ishii's model. Copyright © 2006 by ASME.

    DOI: 10.1115/ICONE14-89332

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  • Modeling and hybrid simulation of bubbly flow 査読

    A. Tomiyama, K. Sakoda, K. Hayashi, A. Sou, N. Shimada, S. Hosokawa

    Multiphase Science and Technology   18 ( 1 )   73 - 110   2006年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Computational Multi-Fluid Dynamics, CMFD, has come to play an important role in practical engineering and fundamental researches on multiphase flows. Since a multiphase flow is often comprised of interdependent elementary phenomena with length scales ranging from mesoscale to macroscale, a multipurpose CMFD should cover a wide range of scales by the combination of different numerical methods such as interface tracking, bubble tracking and averaging methods. This report reviews recent activities on CMFD for bubbly flows, in particular, an improvement of an interface tracking method based on volume tracking, two types of hybrid CMFD methods based on a combination of interface tracking and bubble tracking methods and that of interface tracking and averaging methods, and work in progress heading toward the hybrid combination of the three methods.

    DOI: 10.1615/MultScienTechn.v18.i1.40

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  • 超高出力密度炉心ABWRプラントの実用化に向けた技術開発—(7) 気水分離器内流動特性評価試験

    片岡 宏庸, 冨山 明男, 細川 茂雄, 宋 明良, 茶木 雅夫

    日本原子力学会 年会・大会予稿集   2006f   258 - 258   2006年

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    出版者・発行元:一般社団法人 日本原子力学会  

    超高出力密度炉心の採用により炉心出口部での蒸気クオリティは増加する.これに伴い高クオリティ条件に適合する気水分離器の開発に有用な,気水分離器縮小モデルを用いた基礎実験データが望まれる.本研究では,気水分離器縮小モデル内の空気_-_水系気液旋回二相流を対象として、その気液分離特性、圧力損失などの基礎実験データを取得した.

    DOI: 10.11561/aesj.2006f.0.258.0

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  • Dissolution of Carbon Dioxide in a CO2-Water Bubbly Upflow in a Vertical Pipe

    TOMIYAMA Akio, SHIMA Toshihide, HOSOKAWA Shigeo, SOU Akira

    Proc. Japan-UK Mini-Seminar on Multiphase Flow   pp.1-5   2005年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • LDV Measurement of Cavitating Flows in a Two-Dimensional Nozzle

    SOU Akira, TOMIYAMA Akio, HOSOKAWA Shigeo, NIGORIKAWA Shinji, MATSUMOTO Yoichiro

    Proc. International Symposium on Heat and Mass Transfer in Spray Systems   CD-ROM, #29, pp. 1-10.   2005年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Molecular Tagging Velocimetry based on Photobleaching Reaction for Measuring Liquid Velocity and Velocity Gradients 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 13th International Conference on Nuclear Engineering, (CD-ROM)   (CD-ROM), 1-10   2005年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Image Processing of Bubble Shape and Motion Based on Curvature Evaluation From Bubble Image 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 6th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHTF6)   1-8   2005年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Cavitation and Internal Flow in a Two-Dimensional Injector Nozzle 査読

    SOU Akira, TOMIYAMA Akio, HOSOKAWA Shigeo, NIGORIKAWA Shinji, MATSUMOTO Yoichiro

    Proc.6th US-Japan Seminar on Two-Phase Flow Dynamics   1, 217-225   2004年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turbulence modification in gas-liquid and solid-liquid dispersed two-phase pipe flows 査読

    S Hosokawa, A Tomiyama

    INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW   25 ( 3 )   489 - 498   2004年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The ratio phi of the eddy viscosity induced by the dispersed phase to the shear-induced eddy viscosity was confirmed to be an appropriate parameter for correlating turbulence modification in gas-solid two-phase pipe flows in our previous study. The purpose of this study is to examine the applicability of phi to gas-liquid and solid-liquid two-phase dispersed upflows in vertical pipes. Experiments were, therefore, conducted under various conditions, in which liquid, gas and solid volumetric fluxes, particle diameter and pipe diameter were chosen as parameters. The velocities of continuous and dispersed phases and the phase fractions were measured by LDV and an image processing method. It was confirmed that measured turbulence modification is better correlated with phi than with the critical parameter proposed by Gore and Crowe. The critical point at which no modification occurs is close to phi = 1, irrespective of the type of two-phase dispersed flow. (C) 2004 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.ijheatfluidflow.2004.02.001

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  • Visualization of Cavitation in a Two-Dimensional Nozzle and Liquid Jet 査読

    SOU Akira, TOMIYAMA Akio, HOSOKAWA Shigeo, NIGORIKAWA Shinji, MATSTUMOTO Yoichiro

    Proc. 5th International Conference on Multiphase Flow   Paper №479, pp.1-12   2004年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 正方形ダクト内単一気泡の形状と上昇速度に関する研究 査読

    中原 裕介, 冨山 明男, 細川 茂雄

    日本機械学会論文集(B編)   Vol.70,No.690,pp.356-362   2004年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • An image processing method for evaluating interface Curvature and its application to gas-liquid bubble flower in a vertical pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc.6th US-Japan Seminar on Two-Phase Flow Dynamics   1,199-205   2004年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Shapes and Rising Velocities of Single Bubbles in Square Ducts 査読

    Yusuke Nakahara, Akio Tomiyama, Shigeo Hosokawa

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   70 ( 690 )   356 - 362   2004年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Mechanical Engineers  

    Shapes and rising velocities of single bubbles rising through vertical square ducts were measured under stagnant, laminar and turbulent flow conditions to examine the applicability of available empirical correlations for singe bubbles in vertical pipes to those in square ducts. Experiments were carried out by using three different ducts, the widths W of which were 13.0, 16.2 and 27.2 mm. The ratio λ of sphere-volume equivalent bubble diameter d to W was varied from 0.2 to 2.0. As a result, it was confirmed that (1) empirical correlations for evaluating terminal velocities of a bubble in a pipe are applicable to a bubble in a square duct, provided that the characteristics length of duct is evaluated as (4A/π)0.5 where A is the flow area, and (2) bubble shapes in square ducts are well expressed as a function of the liquid Reynolds number and the Eötvös number.

    DOI: 10.1299/kikaib.70.356

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  • Modelong and Hybrid Simulation of Bubbly Flow(Keynote Lecture) 査読

    TOMIYAMA Akio, SAKODA Kenichi, HAYASHI Kosuke, SOU Akira, SHIMADA Naoki, HOSOKAWA Shigeo

    Proc.6th US-Japan Seminar on Two-Phase Flow Dynamics   1,1-16   2004年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 鉛直円管内低粒子濃度固気二相流の乱流変調に及ぼす相関相対速度の影響 査読

    細川 茂雄, 冨山 明男

    混相流   18-3,255-262   2004年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Investigation of Flow Structure and Temperature Fluctuation in a Closed Branch Pipe Connected to High Velocity and High Temperature Flow in a Main Pipe 査読

    TAKENAKA Nobuyuki, HOSOKAWA Shigeo, HASE M, ONOJIMA D, NAKAMURA N, OOUMAYA T

    Proc.4th Japan-Korea Symp.on Neclear Thermal Hydraulics and Safety   NTHAS-4,43-50   2004年

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  • Molecular tagging velocimetry based on photobleaching reaction and its application to flows around single fluid particles 査読

    Shigeo Hosokawa, Akio Tomiyama

    Multiphase Science and Technology   16 ( 4 )   335 - 353   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Most of unintrusive velocimetry techniques utilize small tracer particles to visualize a flow field. The addition of tracer particles in flows induces errors and flow disturbance due to their poor followability and accumulation on gas-liquid interface. A molecular tagging velocimetry based on photobleaching reaction is developed in this study. The most significant features of the developed method are as follows: (a) local instantaneous velocity, strain rate and rotation are measurable, (b) the measurement can be performed at arbitrary points in a flow field, and (c) tracer particles disturbing a flow are not required. The method was applied to a laminar pipe flow and flows around a bubble and a drop. It is confirmed that (1) the method can accurately measure radial distributions of liquid velocity and shear stress in the pipe flow, (2) local instantaneous velocity distributions around single bubbles and a drop are successfully measured, (3) the time evolution of velocity field is measurable by forming multiple tags in a matrix arrangement, and (4) the liquid velocity in the vicinity of gas-liquid interface can be measured, provided that tags are formed there.

    DOI: 10.1615/MultScienTechn.v16.i4.40

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  • Numerical Simulation of Drops in a Shear Flow by a Lattice-Boltzmann Binary Fluid Model. 査読

    TAKADA Naoki, TOMIYAMA Akio, HOSOKAWA Shigeo

    Comp. Fluid Dynamics, J.   Vol.12,No.3,pp.475-481   2003年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • PIV measurement of pressure distributions about single bubbles 査読

    S Hosokawa, S Moriyama, A Tomiyama, N Takada

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   40 ( 10 )   754 - 762   2003年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Measurements of velocity and pressure distributions around a bubble are of fundamental importance to model the forces acting on the bubbles and to verify detailed numerical methods for the prediction of flow in nuclear reactors. The measurements of velocity distributions around a bubble have been conducted to understand the interaction between liquid flow and bubbles. However there are few studies on pressure distributions around a bubble for the lack of measurement method. In this study, we developed a method for evaluating a pressure distribution by making use of velocity data obtained by a particle image velocimetry (PIV) or a particle tracking velocimetry (PTV), and applied it to laminar pipe flows, laminar flows around single particles and single bubbles in a pipe to examine its accuracy and applicability to the flow around single bubbles. As a result, we could confirm that the method can evaluate the pressure distribution in various laminar flows, provided that the velocity data possess a good quality and a flow of concern is two-dimensional. The proposed method therefore has a potential to provide the important information for modeling of the bubble motion and verification of CFD methods such as interface tracking and lattice Boltzmann methods.

    DOI: 10.1080/18811248.2003.9715416

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  • Lattice Boltzmann Simulation of Drops in a Shear Flow. 査読

    TAKADA Naoki, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. 4th ASMER-JSME Joint Fluids Engineering Conf.   CD-ROM   2003年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Influence of electric field on single gas-bubble growth and detachment in microgravity 査読

    P Di Marco, W Grassi, G Memoli, T Takamasa, A Tomiyama, S Hosokawa

    INTERNATIONAL JOURNAL OF MULTIPHASE FLOW   29 ( 4 )   559 - 578   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The effect of electric and gravitational field on detachment and motion of gas bubbles was studied by injecting nitrogen in a fluoroinert liquid (FC-72) at ambient temperature and pressure through an orifice (about 0.1 mm diameter) drilled in a horizontal tube. In such a way, it was possible to investigate the mechanical effects in bubble dynamics separately from the thermal and mass exchange ones involved in boiling. An electric field of nearly cylindrical geometry was generated around the tube by imposing a D.C. potential drop V (0-18 kV) to a eight-rod cylindrical "squirrel cage" surrounding it. The apparatus was operated in microgravity conditions in the dropshaft of JAMIC in Hokkaido, Japan. Bubble size, detachment frequency and velocity were measured by digital processing of high-speed video images. The results showed that in the absence of electric field bubble detachment did not take place at low gas flow rate; conversely at higher gas flow, the dynamical effects were sufficient to induce bubble detachment even in the absence of the buoyant force. The application of electric field was confirmed to be effective in promoting bubble detachment at values of diameter greater but of the same order of magnitude as in normal gravity, and in providing a force to remove the bubbles away from the orifice. (C) 2003 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0301-9322(03)00030-2

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  • An Interface Tracking Method based on Volume Tracking in Micro Cells embedded in Regular Computational Cells 査読

    TOMIYAMA Akio, NAKAHARA Yusuke, HOSOKAWA Shigeo

    CFD Journal   Vol. 11. No. 4, pp. 411-419   2003年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Shapes and rising velocities of single bubbles rising through an inner subchannel

    A Tomiyama, Y Nakahara, Y Adachi, S Hosokawa

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   40 ( 3 )   136 - 142   2003年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ATOMIC ENERGY SOC JAPAN  

    Shapes and velocities of single air bubbles rising through stagnant and flowing waters in an inner subchannel are measured by making use of fluorocarbon tubes. It is confirmed that, (1) bubble shapes and motions in the subchannel are by far different from those in simple geometry, and they depend on the ratio. of the bubble diameter to the subchannel hydraulic diameter, (2) when lambda&gt;0.9, a part of a bubble intrudes into neighboring subchannels, and thereby a kind of void drift takes place even with a single bubble, (3) the terminal velocity V-T of a small bubble (lambda&lt;0.9) is accurately predicted by a theoretical model proposed by Tomiyama et al., (4) an empirical correlation of V-T for cell-Taylor bubbles (X &gt; 0.9) is presented, and (5) the rising velocity V-B in laminar and turbulent flow conditions are well evaluated by substituting the proposed V-T models and the ratio of the maximum liquid velocity to the mean liquid velocity into the Nicklin correlation.

    DOI: 10.3327/jnst.40.136

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  • Shapes and rising velocities of single bubbles rising through an inner subchannel 査読

    A Tomiyama, Y Nakahara, Y Adachi, S Hosokawa

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   40 ( 3 )   136 - 142   2003年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ATOMIC ENERGY SOC JAPAN  

    Shapes and velocities of single air bubbles rising through stagnant and flowing waters in an inner subchannel are measured by making use of fluorocarbon tubes. It is confirmed that, (1) bubble shapes and motions in the subchannel are by far different from those in simple geometry, and they depend on the ratio. of the bubble diameter to the subchannel hydraulic diameter, (2) when lambda&gt;0.9, a part of a bubble intrudes into neighboring subchannels, and thereby a kind of void drift takes place even with a single bubble, (3) the terminal velocity V-T of a small bubble (lambda&lt;0.9) is accurately predicted by a theoretical model proposed by Tomiyama et al., (4) an empirical correlation of V-T for cell-Taylor bubbles (X &gt; 0.9) is presented, and (5) the rising velocity V-B in laminar and turbulent flow conditions are well evaluated by substituting the proposed V-T models and the ratio of the maximum liquid velocity to the mean liquid velocity into the Nicklin correlation.

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  • Lattice Boltzmann simulation of interfacial deformation 査読

    N Takada, A Tomiyama, S Hosokawa

    INTERNATIONAL JOURNAL OF MODERN PHYSICS B   17 ( 1-2 )   179 - 182   2003年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    This study describes the numerical simulations of two-phase interfacial deformations using the binary fluid (BF) model in the lattice Boltzmann method (LBM), where a macroscopic fluid involves mesoscopic particles repeating collisions and propagations and an interface is reproduced in a self-organizing way by repulsive interaction between different kinds of particles. Schemes for the BF model axe proposed to simulate motions of immiscible two phases with different mass densities. For higher Reynolds number, the finite difference-based lattice Boltzmann scheme is applied to the kinetic equations of particles, which include convection terms to reduce the diffusivity of each phase volume. In addition, two parameters are introduced into the BF model to adjust surface tension and interfacial thickness independently. The numerical results of three-dimensional bubble motion under gravity and two-dimensional droplet deformation under shear stress indicate that the lattice-Boltzmann BF model with the proposed schemes would be applicable to simulating interfacial dynamics of immiscible two-phase fluids.

    DOI: 10.1142/S0217979203017308

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  • An Interface Tracking Method based on Volume Tracking in Micro Cells embadded in Regular Computational Cells

    TOMIYAMA Akio, NAKAHARA Yusuke, HOSOKAWA Shigeo

    Computational Fluid Dynamics Journal   11(4), 411-419   2003年

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  • Lateral Force Acting on a Deformed Single Bubble due to the Presence of Wall 査読

    Shigeo Hosokawa, Akio Tomiyama

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   69 ( 686 )   2214 - 2220   2003年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Mechanical Engineers  

    Lateral migration of a deformed single bubble rising in the vicinity of a vertical flat plate was measured to evaluate a wall force acting on the bubble. Experimental results indicated that a wall force coefficient Cw is a function of the bubble Reynolds number Re and Morton number M under the condition of low bubble Reynolds number, whereas it is a function of the Eötvös number Eo for high bubble Reynolds number condition. Empirical correlations of Cw were deduced from the experimental results. It was confirmed that the wall force model proposed by one of the authors and the proposed correlations of Cw are applicable for the bubbles under the condition of -6.0. ≤ log10M ≤ -2.5, 2.0 ≤ E0 ≤10.0 and 0.4 ≤ Re ≤ 65, and have a potential for the application to a bubble in an air-water system, provided that the bubble does not collide with the wall.

    DOI: 10.1299/kikaib.69.2214

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  • Characteristics of Liquid Slug Generated at a V-Shaped Elbow between Inclined Pipes 査読

    Shigeo Hosokawa, Akio Tomiyama

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   69 ( 686 )   2208 - 2213   2003年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Mechanical Engineers  

    Liquid slugs in petroleum pipelines in hilly terrain are mainly generated at V-shaped elbows and induce high pressure fluctuation. The slug characteristics generated at elbows such as slug frequency, slug velocity and length are therefore required for the design of pipelines. In this study, we measured the velocity, length and frequency of liquid slug generated at V-shaped elbows. The effects of pipe diameter and inclination angle on the slug characteristics were experimentally examined by using three different pipe diameters and three inclination angles. As a result, it was confirmed that (1) the slug velocity is proportional to the total volume flux, and thereby it is well estimated by a drift flux correlation, (2) the length of a slug unit is well correlated with the ratio of the liquid volume flux to the total volume flux and (3) the slug length can be expressed as a function of the gas volume flux, the slug velocity and the void fraction in a gas bubble region.

    DOI: 10.1299/kikaib.69.2208

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  • 壁面近傍を上昇する単一非球形気泡に働く横方向力 査読

    細川 茂雄, 冨山 明男

    日本機械学会論文集(B編)   69巻686号,pp.2214-2220   2003年

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  • Influence of electric field on single gas-bubble growth and detachment in microgravity 査読

    P. Di Marco, W. Grassi, G. Memoli, T. Takamasa, A. Tomiyama, S. Hosokawa

    International Journal of Multiphase Flow   29 ( 4 )   559 - 578   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Ltd  

    The effect of electric and gravitational field on detachment and motion of gas bubbles was studied by injecting nitrogen in a fluoroinert liquid (FC-72) at ambient temperature and pressure through an orifice (about 0.1 mm diameter) drilled in a horizontal tube. In such a way, it was possible to investigate the mechanical effects in bubble dynamics separately from the thermal and mass exchange ones involved in boiling. An electric field of nearly cylindrical geometry was generated around the tube by imposing a D.C. potential drop V (0-18 kV) to a eight-rod cylindrical "squirrel cage" surrounding it. The apparatus was operated in microgravity conditions in the dropshaft of JAMIC in Hokkaido, Japan. Bubble size, detachment frequency and velocity were measured by digital processing of high-speed video images. The results showed that in the absence of electric field bubble detachment did not take place at low gas flow rate
    conversely at higher gas flow, the dynamical effects were sufficient to induce bubble detachment even in the absence of the buoyant force. The application of electric field was confirmed to be effective in promoting bubble detachment at values of diameter greater but of the same order of magnitude as in normal gravity, and in providing a force to remove the bubbles away from the orifice. © 2003 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0301-9322(03)00030-2

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  • 2246 鉛直円管内気泡流における壁面近傍の乱流特性

    細川 茂雄, 植田 浩生, 藤墳 哲平, 冨山 明男

    年次大会講演論文集   2003   267 - 268   2003年

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Sufficient knowledge of turbulence modification is indispensable to understand the turbulence structure and to develop a turbulence model in gas-liquid two-phase bubbly flow in vertical pipes. There is, however, little information on the interaction between shear-induced turbulence and bubbles in the near wall region, whereas many researches have been carried out on the turbulence properties in gas-liquid bubbly flow in a vertical pipe. In this study, we measured liquid velocity in the near wall region where the shear-induced turbulence is generated and interacts with bubbles. The measured result indicated that (1) bubbles increase the gradient of mean liquid velocity and therefore the shear-induced turbulence is enhanced in the near wall region, and (2) bubbles break up the developed large-scale shear-induced eddy and obstruct the transfer of turbulence energy from the near wall region to the core region.

    DOI: 10.1299/jsmemecjo.2003.3.0_267

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  • 下降ー上昇傾斜管のV字部において発生する液体スラグの特性 査読

    細川 茂雄, 冨山 明男

    日本機械学会論文集(B編)   69巻686号,pp.2214-2220   2003年

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  • Turbulence modification in gas-liquid and solid-liquid dispersed two-phase pipe flows. 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Turbulence and Shear Flow Phenomena-2003(TSFP-3)   Vol.1,pp.191-196   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurement of Liquid Velocity around Single Bubbles Using Photobleaching. 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    3rd European-Japanese Two Phase Flow Group Meeting 2003   CD-ROM   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Interface Tracking Simulation of Large Bubbles in Vertical Conduits 査読

    TOMIYAMA Akio, NAKAHARA Yusuke, ADACHI Yoshihiro, HOSOKAWA Shigeo

    Proc. 5th JSME-KSME Fluid Engineering Conference   2002年11月

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  • Bubble-induced pseudo turbulence in a vertical pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, KONDO Yuichi

    Proc. 5th JSME-KSME Fluid Engineering Conference   2002年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Two-way Bubble Tracking Simulation of Void Wave Generation in a Bubbly Pipe Flow 査読

    TOMIYAMA Akio, SAKODA Kenichi, HOSOKAWA Shigeo

    Proc. 5th JSME-KSME Fluid Engineering Conference   2002年11月

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  • Lattice Boltzmann simulation of two-phase fluid motion 査読

    TAKADA Naoki, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. 5th JSME-KSME Fluid Engineering Conference   2002年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • PIV Measurement of Pressure Distributions about Single Bubbles 査読

    HOSOKAWA Shigeo, MORIYAMA Satoshi, TOMIYAMA Akio, TAKADA Naoki

    Proc. Third Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety, NTHAS3   2002年10月

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  • Shape and Rising Velocities of Single Bubbles rising through an Inner Subchannel 査読

    TOMIYAMA Akio, NAKAHARA Yusuke, ADACHI Yoshihiro, HOSOKAWA Shigeo

    Proc. Third Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety, NTHAS3   2002年10月

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  • Terminal velocity of single bubbles in surface tension force dominant regime 査読

    A Tomiyama, GP Celata, S Hosokawa, S Yoshida

    INTERNATIONAL JOURNAL OF MULTIPHASE FLOW   28 ( 9 )   1497 - 1519   2002年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Terminal velocity V-T of a single bubble rising through an infinite stagnant liquid in surface tension force dominant regime was investigated theoretically and experimentally. A theoretical V-T model, which is applicable to a distorted spheroidal bubble with a high bubble Reynolds number, was deduced from a jump condition and a potential flow theory for a flow about an oblate spheroid. Experiments were conducted using air and water to measure bubble trajectories, shapes and velocities. As a result, it was confirmed that (1) the primal cause of widely scattered V-T in this regime is not surfactant concentration but initial shape deformation, (2) small initial shape deformation results in a low V-T and a high aspect ratio, whereas large initial shape deformation results in a high V-T and a low aspect ratio, (3) the primal role of surfactants in this regime is to cause the damping of shape oscillation, by which a contaminated bubble behaves as if it were a clean bubble with low initial shape deformation, and (4) the proposed model gives good predictions of V-T for single distorted bubbles. (C) 2002 Elsevier Science Ltd. All rights reserved.

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  • Transverse migration of single bubbles in simple shear flows 査読

    A Tomiyama, H Tamai, Zun, I, S Hosokawa

    CHEMICAL ENGINEERING SCIENCE   57 ( 11 )   1849 - 1858   2002年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Trajectories of single air bubbles in simple shear flows of glycerol-water solution were measured to evaluate transverse lift force acting on single bubbles. Experiments were conducted under the conditions of -5.5 less than or equal to log(10) M less than or equal to -2.8, 1.39 less than or equal to Eo less than or equal to 5.74 and 0 less than or equal to \dV(L)/dy\ less than or equal to 8.3 s(-1), where M is the Morton number, Eo the Eotvos number and dV(L)/dy the velocity gradient of the shear flow. A net transverse lift coefficient C-T was evaluated by making use of all the measured trajectories and an equation of bubble motion. It was confirmed that C-T for small bubbles is a function of the bubble Reynolds number Re, whereas C-T for larger bubbles is well correlated with a modified Eotvos number Eo(d) which employs the maximum horizontal dimension of a deformed bubble as a characteristic length. An empirical correlation Of C-T was therefore summarized as a function of Re and Eo(d). The critical bubble diameter causing the radial void profile transition from wall peaking to core peaking in an air-water bubbly flow evaluated by the proposed CT correlation coincided with available experimental data. (C) 2002 Elsevier Science Ltd. All rights reserved.

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  • Lateral migration of single bubbles due to the presence of wall 査読

    Shigeo Hosokawa, Akio Tomiyama, Shinji Misaki, Tomoyuki Hamada

    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED   257 ( 1 B )   855 - 860   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Lateral migration of a single bubble rising in the vicinity of a vertical flat plate was measured to evaluate a wall force acting on the bubble. Experimental results indicated that a wall force coefficient CW3 is a function of the bubble Reynolds number Re and the Eötvös number Eo. Empirical correlations of CW3 were deduced for bubbles and particles. It was confirmed that the wall force model proposed by one of the authors and the proposed correlations of CW3 are applicable not only to high viscousity systems but also for low viscousity systems, provided that a bubble does not collide with the wall.

    DOI: 10.1115/FEDSM2002-31148

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  • 1351 気泡追跡法による鉛直管内未発達気泡流の数値計算

    山本 修示, 玉井 秀定, 冨山 明男, 細川 茂雄

    年次大会講演論文集   2002   325 - 326   2002年

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    A three-dimensional one-way Bubble Tracking Method has been proved to give good predictions for the spatial evolution of flow pattern, mean void fraction, void fluctuation, mean pressure drop and pressure drop fluctuation in developing bubble flows in vertical pipes. In this study, the spatial evolution of radial developing bubble flow. As a result, it is confirmed that the method gives good predictions of local void fractions, provided that bubble size distributions at an inlet were available.

    DOI: 10.1299/jsmemecjo.2002.3.0_325

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  • 平滑な気液界面における界面スリップの測定 査読

    細川 茂雄, 冨山 明男

    日本機械学会論文集   68 ( 671 )   2050 - 2055   2002年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaib.68.2050

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  • Simulation of interface deformation in shear flow using binary fluid lattice Boltzmann model 査読

    Naoki Takada, Akio Tomiyama, Shigeo Hosokawa

    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED   257 ( 1 B )   867 - 874   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    In this paper, we describes the simulations of two- and three-dimensional interfacial motions in shear flow based on the lattice Boltzmann method (LBM), in which a macroscopic fluid flow results from averaging collision and translation of mesoscopic particles and an interface can be reproduced in a self-organizing way by repulsive interaction between particles. A new scheme in the binary fluid model is proposed to simulate motions of immiscible two phases with different mass densities, and examined in numerical analysis of bubble motions under gravity in a circular tube and deformation of bubble under shear stress. For higher Reynolds numbers, a finite difference-based lattice Boltzmann scheme is applied to the kinetic equations of particle to improve numerical stability, which can capture break-up motions of bubble. Parallel computing in LBM is also discussed briefly for efficient speeding up.

    DOI: 10.1115/FEDSM2002-31150

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  • Terminal Velocity of Single Bubbles in Infinite Stagnant Liquid 査読

    TOMIYAMA Akio, HOSOKAWA Shigeo, YOSHIDA Satoru, Gian Piero Celata

    Proc. Conference on Transport Phenomena with Moving Boundaries   2001年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 鉛直管内気液二相スラグ流における大気泡長さ、液体スラグ長さ、スラグユニット長さ並びにスラグ周期の推算式 査読

    坂口 忠司, 濱口 八郎, 赤対 秀明, 冨山 明男, 南川 久人, 細川 茂雄

    混相流   Vol.15, No.3, pp.288-295   2001年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Surface Tension Force Dominant Regime Of Single Bubbles Rising Through Stagnant Liquids 査読

    TOMIYAMA Akio, YOSHIDA Satoru, HOSOKAWA Shigeo

    Proc. U.K.- Japan Seminar on Two-phase Flow   2001年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turbulence modification and Reynolds stresses in dispersed two-phase flows in vertical pipes 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. U.K.- Japan Seminar on Two-phase Flow   2001年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Detailed velocity measurement in the vicinity of stratified gas-liquid interface between gas and liquid phases using LDV 査読

    HOSOKAWA Shigeo, ISHIDA Ken, TOMIYAMA Akio

    Proc. 3rd International Conference on Measurement Techniques for Multiphase Flows   pp. 158-164   2001年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Correlations for Large Bubble Length, Liquid Slug Length, Slug Unit Length and Slug Period of Gas-Liquid Two-Phase Slug Flow in Vertical Pipes 査読

    SAKAGUCHI Tadashi, HAMAGUCHI Hachiro, SHAKUTHUI Hideaki, TOMIYAMA Akio, MINAGAWA Hisato, HOSOKAWA Shigeo

    Proc. International Conference on Multiphase Flow 2001   No. 745   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Velocity and Pressure Distributions around Large Bubbles rising through a Vertical Pipe 査読

    TAMAI Hidesada, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. International Conference on Multiphase Flow 2001   No.493   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turbulence Modification of Gas-Liquid-Solid Three-Phase Bubbly Flow in a Vertical Pipe 査読

    SHAKUTSUI Hideaki, SUYAMA Hiroshi, Ohashi Takakazu, HOSOKAWA Shigeo, TOMIYAMA Akio, SAKAGUCHI Tadashi

    Proc. International Conference on Multiphase Flow 2001   No.828   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Three-Dimensional Simulation of Bubble Motion by Lattice Boltzmann Method 査読

    TAKADA Naoki, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. ASME FED Summer Meeting, 2001   FEDSM2001-18179   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Terminal velocity of Single Bubbles in Surface Tension Dominant Regime 査読

    TOMIYAMA Akio, Gian Piero Celata, HOSOKAWA Shigeo, YOSHIDA Satoru

    Proc. 39th European Two-Phase Flow Group Meeting   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Simulation of Two-Phase Fluid Motion by Lattice Boltzmann Method 査読

    TAKADA Naoki, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. International Conference on Multiphase Flow 2001   No.507   2001年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Interface slip on a stratified gas-liquid interface 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, ISHIDA Ken

    Proc. ASME FED Summer Meeting, 2001   FEDSM2001-18185   2001年6月

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  • Simulation of bubble motion under gravity by lattice Boltzmann method 査読

    N Takada, M Misawa, A Tomiyama, S Hosokawa

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   38 ( 5 )   330 - 341   2001年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    We describe the numerical simulation results of bubble motion under gravity by the lattice Boltzmann method(LBM), which assumes that a fluid consists of mesoscopic fluid particles repeating collision and translation and a multiphase interface is reproduced in a self-organizing way by repulsive interaction between different kinds of particles. The purposes in this study are to examine the applicability of LBM to the numerical analysis of bubble motions, and to develop a three-dimensional version of the binary fluid model that introduces a free energy function. We included the buoyancy terms due to the density difference in the lattice Boltzmann equations, and simulated single- and two-bubble motions, setting flow conditions according to the Eotvos and Morton numbers. The two-dimensional results by LBM agree with those by the Volume of Fluid method based on the Navier-Stokes equations. The three-dimensional model possesses the surface tension satisfying the Laplace's law, and reproduces the motion of single bubble and the two-bubble interaction of their approach and coalescence in circular tube. These results prove that the buoyancy terms and the 3D model proposed here are suitable, and that LBM is useful for the numerical :analysis of, bubble motion under gravity.

    DOI: 10.1080/18811248.2001.9715037

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  • B207 鉛直管内気液二相気泡流におけるレイノルズ応力の測定(オーガナイズドセッション3 : 界面における輸送現象の物理)

    今藤 雄一, 細川 茂雄, 神澤 練太郎, 冨山 明男

    熱工学講演会講演論文集   2001   393 - 394   2001年

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Sufficient knowledge of Reynolds stress is indispensable to understand the turbulence structure and to develop a turbulence model in gas-liquid two-phase bubbly flow. There is, however, little information on the Reynolds shear stress as well as radial and azimuthal turbulence intensities, whereas many researches have concerned on the axial turbulence intensities in a gas-liquid bubbly flow in a vertical pipe. In this study, we utilized a pipe made of fluoro carbon which has the same refractive index with water, and which enabled us to measure the two velocity components simultaneously using LDV in air-water two-phase bubbly flow in vertical pipes. The measured result indicated that all the components of Reynolds stress are affected by the presence of bubbles. Bubble-induced agitation of a liquid velocity field was particularly prominent under a laminar flow condition. Turbulence enhancement as well as suppression due to the presence of bubbles was observed.

    DOI: 10.1299/jsmeptec.2001.0_393

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  • 鉛直管内静止液中を沈降する単一球形粒子の終端速度に関する研究 査読

    細川 茂雄, 濱田 朋起, 冨山 明男

    日本機械学会論文集   B編, 66巻,652号, pp.31-36   2000年12月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Evaluation of Relative Velocity Between Single Bubble and Liquid in horizontal Turbulent Pipe Flow 査読

    HAMADA Tomoyuki, HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 4th JSME-KSME Thermal Engineering Conference   Vol.2, pp.599-604   2000年10月

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  • LDV Measurement of Reynolds Stresses in Gas-Liquid Two-Phase Bubbly Flow in a Vertical Pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, TAKESAKA Kenji, KONDO Yuichi

    Proc. 2nd Japan-korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS2)   pp.247-252   2000年10月

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  • Influence of Frictional Pressure Gradient on Lateral Migration of Single Bubbles 査読

    HAMADA Tomoyuki, HOSOKAWA Shigeo, MATSUI Shinji, TOMIYAMA Akio

    Space Forum (International Journal for Space Policy, Science & Technology for Industrial Applications)   Vol. 6, pp. 65-74   2000年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • 固気液三相流の計測

    赤対 秀明, 南川 久人, 細川 茂雄

    混相流 = Japanese journal of multiphase flow   14 ( 3 )   270 - 279   2000年9月

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    記述言語:日本語   出版者・発行元:THE JAPANESE SOCIETY FOR MULTIPHASE FLOW  

    Three-phase flows are encountered in air-lift pumps, preheaters and reactors, and other industrial plants. It is necessary to clarify not only macroscopic characteristics such as pressure drops and volume fractions of each phase but also local characteristics such as spatial distnbutions of local volume fractions and local velocities of each phase. In the present review, measurement techniques of volumetric fluxes and volumetric fractions of each phase, radial distributions of gas and solid volume fractions and liquid velocities were described for the three-phase bubbly flow. Those of length and velocities of large bubble liquid slug and film thickness of large bubble were also described for the three-phase slug flow Furthermore, application of measurement techniques for two-phase flows to three-phase flows were examined.

    DOI: 10.3811/jjmf.14.270

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    その他リンク: https://jlc.jst.go.jp/DN/JALC/00152027313?from=CiNii

  • Experimental Observation of Coalescence between Planar Bubbles 査読

    HOSOKAWA Shigeo, TAKANO Masashi, TOMIYAMA Akio

    Proc. ASME Fluid Engineering, Summer Meeting   FEDSM11274   2000年6月

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  • Measurement of Turbulence Structure in Dispersed Two-Phase Flows in a Vertical Pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. Japan-US Seminar on Two-Phase Flow Dynamics   2000年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Lattice Boltzmann Simulations of Bubble Flow 査読

    TAKADA Naoki, MISAWA Masashi, TOMIYAMA Akio, HOSOKAWA Shigeo

    Proc. ASME Fluid Engineering, Summer Meeting   FEDSM11276   2000年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Terminal velocities of single spherical particles falling in a water-filled vertical pipe 査読

    Shigeo Hosokawa, Tomoyuki Hamada, Akio Tomiyama

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   66 ( 652 )   3071 - 3076   2000年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Mechanical Engineers  

    Terminal velocities of single solid particles or bubbles are one of the most fundamental knowledges required for modeling and simulation of dispersed two-phase flows in vertical pipes. However, there are few available correlations which can cover a wide range of parameters, i. e., the ratio of a particle diameter to a pipe diameter, particle density as well as the falling motions of particles such as rectilinear and rocking. In this study, we proposed a semi-empirical model of terminal settling velocity which can cover a wide range of parameters, based on a singular pressure loss about a particle. Experiments were also carried out to develop an empirical correlation based on the proposed semi-empirical model of terminal settling velocity of a particle falling through a Iiluid-filled pipe. It was confirmed through comparisons of terminal velocities between the measurements and the developed correlation that the proposed model can give good estimations of terminal velocities under various terminal settling conditions.

    DOI: 10.1299/kikaib.66.652_3071

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  • Turbulence Modification in Dispersed Two-phase flow in a Vertical Pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. Asian Symposium on Multiphase Flow   pp.63-68   1999年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurement of Transverse Migration of Single Bubbles in a Couette Flow 査読

    TOMIYAMA Akio, Iztok Zun, TAMAI Hidesada, HOSOKAWA Shigeo, Okuda Takeo

    Proc. Two-Phase Flow Modelling & Experimentation   Vol.2, pp.941-948   1999年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • ブラフボデーを用いた高速水素拡散燃焼における保炎特性の計測(第1報,ラム燃焼器内の保炎と混合) 査読

    齋藤 剛, 池田 裕二, 細川 茂雄, 中島 健, 黒澤 要治, 田丸 卓

    日本機械学会論文集   B編,第65巻, 633号, pp. 1813-1821   1999年5月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Spatial Evolution of Developing Air-Water Bubble Flow in a Vertical Pipe 査読

    TOMIYAMA Akio, TAMAI Hidesada, SHIMOMURA Hiroshi, HOSOKAWA Shigeo

    Proc. Two-Phase Flow Modelling & Experimentation   Vol.2, pp.1027-1034   1999年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turbulence Modification Due to Bubbles and Particles in Dispersed Two-Phase Upflow in a Vertical Pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio

    Proc. 7th Int. Conf. on Nuclear Engineering   ICONE-7242   1999年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Onset of Slugging of a residual stagnant liquid at a V-shaped portion of a pipeline 査読

    MANABE Ryo, TOMIYAMA Akio, HOSOKAWA Shigeo, TORII Takeshi, HASEGAWA Masanobu

    Proc. of elce’99 (ASME 75th Anniversary conference, Energy Sources Technology Conference and Exhibition)   1999年2月

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  • Influence of Frictional Pressure Gradient on Lateral Migration of Single Bubbles 査読

    HAMADA Tomoyuki, HOSOKAWA Shigeo, TOMIYAMA Akio, MATSUI Shinji, SAKAGUCHI Tadashi

    Proc. Drop Tower Days in Hokkaido   pp. 40-42   1998年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Decay Properties of Tylor-Green Vortex Laden with Solid Particles 査読

    HOSOKAWA Shigeo, Jhon Eaton, Damian Rosan, Scott Abrahamson

    Proc. 3rd Int. Conf. on Multiphase Flow   1998年6月

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  • Turbulence Modification due to the Third Phase to Gas-Liquid and Liquid-Solid Two-Phase Flow 査読

    SHAKUTSUI Hideaki, TOMIYAMA Akio, HOSOKAWA Shigeo, SAKAGUCHI Tadashi

    Proc. 3rd Int. Conf. on Multiphase Flow   1998年6月

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  • Influences of Relative Velocity on Turbulent Intensity in Gas-Solid Two-Phase Flow in a Vertical Pipe 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, MORIMURA Masaru, FUJIWARA Shinya, SAKAGUCHI Tadashi

    Proc. 3rd Int. Conf. on Multiphase Flow   1998年6月

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  • Unintrusive Measurement of Phase Density Function and Velocity 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, TAKESAKA Kenji, SAKAGUCHI Tadashi

    Proc. European-Japanese Two-Phase Flow Group Meeting   1998年5月

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  • Three Dimensional Distribution of Liquid Velocity of Gas-Liquid Two-Phase Slug Flow in Horizontal Pipes 査読

    HOSOKAWA Shigeo, SAKAGUCHI Tadashi, TOMIYAMA Akio, HAMADA Kazuaki, MANABE Ryo

    Proc. 2nd Japanese-GermanSymp. on Multi-Phase Flow   pp. 97-106   1997年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Lateral Migration of Single Bubbles in a Laminar Duct Flow under Normal and Micro Gravity Conditions 査読

    SAKAGUCHI Tadashi, TOMIYAMA Akio, Iztok Zun, HOSOKAWA Shigeo

    Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1998   1997年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Measurement of Flow Field Around a Solid Particle Using Photochromic Dye 査読

    HOSOKAWA Shigeo, TOMIYAMA Akio, MIZUSHIMA Seijiro, SAKAGUCHI Tadashi

    Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1997   Vol. 1, pp. 51-58   1997年6月

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  • Cycle-resolved PDA measurement of size-classified spray structure of air-assist injector 査読

    Yuji Ikeda, Shigeo Hosokawa, Fukashi Sekihara, Tsuyoshi Nakajima

    SAE Technical Papers   Paper No. 970631   1997年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Very high data rate Phase Doppler Measurements were carried out in order to demonstrate the spray characteristics at each cycle and how each injection differed from each other. Conventional time-averaged data analysis can hardly provide information to analysis cyclic variation of spray formation and droplet dynamics so that a cycle-resolved PDA system was developed in the study. A direct gasoline injector for two-stroke marine engine was used for the experiment. For data analysis, droplet dynamics and characteristics of different droplet diameter were examined. The results show mat cycle variation of injector was remarkable, the maximum spray tip velocity differed from 63 m/s to 93 m/s even for the consecutive injection. The data rate obtained was over 40 kHz (Max: 85 kHz) and bin width was carefully examined to show the spray collision to air and entrained air motion. The high speed cycle formed large velocity fluctuation and small vortex time scale, while the low speed cycle was not so clear for the vortex entrainment. © Society of Automotive Engineers, Inc.

    DOI: 10.4271/970631

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  • Characteristics of Slug Flow in a Hilly-Terrain Pipe 査読

    SAKAGUCHI Tadashi, MINAGAWA Hisato, HOSOKAWA Shigeo, SUGIURA Morio, HASEGAWA Masanobu

    Proc. Japan-US Seminar on Two-Phase Flow Dynamics   pp. 9 - 10   1996年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Effect of Flame Holder Shape on Vortex Shedding 査読

    HOSOKAWA Shigeo, IKEDA Yuji, NAKAJIMA Tsuyoshi

    32nd AIAA/AS ME/SAE/ASEE Joint Propulsion Conference and Exhibit   AIAA Paper No.96-3130   1996年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 狭平行平板内静止液中単一空気泡の終端速度と抗力係数 査読

    冨山 明男, 細川 茂雄, 江原 昌彦, 宮永 佳晴, 川久保 芳男, 木野戸 広

    混相流   第10巻第2号, pp. 146 - 154   1996年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 水平丘谷管路内気液二相流の流動様式に関する研究(第2報:水平管および水平-緩傾斜上昇管における流動様式) 査読

    坂口 忠司, 南川 久人, 細川 茂雄, 兪 和俊, 杉浦 守男, 井原 賢, 清水 信寿, 池田 憲治

    混相流   第10巻第2号, pp. 138 - 145   1996年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 横U字管と上下水平管からなる管路における気液二相流の流動様式 査読

    坂口 忠司, 藤井 快彦, 細川 茂雄, 南川 久人, 中森 信夫, 上野 隆司, 児玉 淳一郎

    混相流   第10巻第1号,pp. 39-49   1996年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 水平丘谷管路内気液二相流の流動様式に関する研究(第1報:水平管および水平-緩傾斜下降管における流動様式) 査読

    坂口 忠司, 南川 久人, 細川 茂雄, 兪 和俊, 杉浦 守男, 井原 賢, 清水 信寿, 池田 憲治

    混相流   第10巻第1号,pp. 50-59   1996年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Study on the flow pattern of gas-liquid two-phase flow in horizontal and hilly-terrain pipes 査読

    SAKAGUCHI Tadashi, MINAGAWA Hisato, HOSOKAWA Shigeo, YU Kazutoshi, SUGIURA Morio, HAMADA Kazukai, IHARA Satoshi, SHIMIZU Nobutoshi, IKEDA Kenji

    Proc. International Conference on Multi-Phase Flow '95   Vol.3, FT1.1-1.8.   1995年4月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Vortex Shedding Flow Calculation using Time-Dependent k-εTubulence Model 査読

    HOSOKAWA Shigeo, IKEDA Yuji, NAKAJIMA Tsuyoshi

    33rd AIAA Aerospace Sciences Meeting   AIAA Paper No. 950802   1995年1月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Flow pattern of gas-liquid two-phase flow in a horizontal U bend pipe 査読

    T Sakaguchi, S Hosokawa, Y Fujii, H Minagawa, N Nakamori, T Ueno, J Kodama

    MULTIPHASE FLOW 1995   pp. 407-416   407 - 416   1995年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE PUBL B V  

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  • Flow pattern of gas-liquid two-phase flow in a horizontal U bend pipe 査読

    T Sakaguchi, S Hosokawa, Y Fujii, H Minagawa, N Nakamori, T Ueno, J Kodama

    MULTIPHASE FLOW 1995   Vol.3, FT1.9-1.16.   407 - 416   1995年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE PUBL B V  

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  • VELOCITY MEASUREMENT OF GAS-LIQUID 2-PHASE SLUG FLOW IN A HORIZONTAL PIPE 査読

    T SAKAGUCHI, H MINAGAWA, S HOSOKAWA, K YU, M IHARA, K IKEDA, N SHIMIZU

    MULTIPHASE FLOW AND HEAT TRANSFER, VOLS 1 AND 2   Vol.2, pp. 1377-1384   1377 - 1384   1994年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:XIAN JIAOTUNG UNIV PRESS  

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  • Optimum Seeding Particles for Successful Laser Doppler Velocimeter Measurements 査読

    Yuji Ikeda, Masashi Nishigaki, Masamichi Ippommatsu, Tsuyoshi Nakajima

    Particle &amp; Particle Systems Characterization   11 ( 2 )   127 - 132   1994年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Seeding particles for laser Doppler velocimeter (LDV) measurement have been developed which are of uniform diameter, spherical shape, low loose weight and high melting temperature. Evaluation test results show that the use of the particles can increase the signal quality substantially and extend the measurable field of the LDV, which can hardly be accessed by conventional measurement methods. Copyright © 1994 Verlag GmbH &amp
    Co. KGaA, Weinheim

    DOI: 10.1002/ppsc.19940110204

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  • Isothermal Flow Characteristics behind V-Shape Gutter with and without Injection 査読

    IKEDA Yuji, HOSOKAWA Shigeo, MINATO Masadhi, NAKAJIMA Tsuyoshi

    Proc. 11th International Symposium on Air Breathing Engine (ISABE)   pp. 449-456   1993年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Numerical Simulation of Vortex Shedding in Ram Combustor 査読

    HOSOKAWA Shigeo, IKEDA Yuji, NAKAJIMA Tsuyoshi

    Proc. Unsteady Combustion   Vol.2, pp18.1-18.10   1993年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Flow Measurements behind V-Gutter under Non-Combusting Condition 査読

    HOSOKAWA Shigeo, IKEDA Yuji, MINATO Masashi, NAKAJIMA Tsuyoshi

    Proc. 31st AIAA Aerospace Meeting and Exhibit   AIAA Paper No. 930020   1993年1月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Flow Characteristics Downstream of V-Gutter type Flame Holder in High Speed Flow 査読

    HOSOKAWA Shigeo, IKEDA Yuji, MINATO Masashi, NAKAJIMA Tsuyoshi

    Proc. 6th Int. Symp. on Application of Laser Techniques to Fluid Mechanics   pp 19.3.1-19.3.6   1992年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • INFLUENCE OF INLET CONDITIONS ON THE FLOWFIELD IN A MODEL GAS-TURBINE COMBUSTOR 査読

    Y IKEDA, Y YANAGISAWA, S HOSOKAWA, T NAKAJIMA

    EXPERIMENTAL THERMAL AND FLUID SCIENCE   5 ( 3 )   390 - 400   1992年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    The flowfields in gas turbine combustors have not been well understood in either experiments or numerical simulations. To increase the accuracy of flow prediction, numerical errors, which come from turbulence model, mesh size, iteration number, and inlet conditions, should be reduced with the assistance of measurements. However, so far very few experimental data have been obtained to evaluate the numerical models and the predicted results.
    The purpose of the present study is to obtain the inlet conditions for a combustor in an isothermal model of the gas turbine combustor that was made to demonstrate the fundamental flow structure of swirling flow and jet flow interactions, in order to compare predicted results with measured results and demonstrate the influence of inlet conditions on the flowfield. A very small fiber laser-Doppler velocimeter was used to measure radial velocity in order to understand the recirculating flow and flow interactions. The momentum ratio of the swirl mass flow rate to the jet mass flow rate was taken to be 1.78-7.01, which would cover all loading conditions. The results indicate that the radial velocity at the swirler exit should be given; otherwise the radial velocity should be half the axial velocity, and the swirl velocity at the jet exit also should be considered, so we propose a way to determine swirl velocity at the jet exits. The predicted flow patterns and turbulent kinetic energy profiles show the major flow structure that can be seen in the experiments. The errors due to the influence of inlet conditions on the flowfield could be reduced and the accuracy of prediction increased if the proposed modification is used.

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  • Flow Structure of Swirling Flow Interfering with Cross Flows 査読

    IKEDA Yuji, HOSOKAWA Shigeo, NAKAJIMA Tsuyoshi

    Proc. IUTAM Symp. on Aerothermodynamics in Combustors   pp. 70-72   1991年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 缶形ガスタービン燃焼器内の流れ構造(第1報:水モデル実験による流れ模様) 査読

    池田 裕二, 中島 健, 細川 茂雄

    日本機械学会論文集   B編, 57巻535号, pp. 1167-1174   1991年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 缶形ガスタービン燃焼器内の流れ構造(第2報:流れ構造と乱流特性) 査読

    池田 裕二, 中島 健, 細川 茂雄

    日本機械学会論文集   B編, 57巻535号, pp. 1175-1182   1991年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Flow Characteristics Measurement in a Model of Gas Turbine Combustor 査読

    IKEDA Yuji, NAKAJIMA Tsuyoshi, HOSOKAWA Shigeo, MATSUMOTO Ryuichi

    Proc. 5th Int. Symp. on Application of Laser Techniques to Fluid Mechanics   p4.5   1990年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 穴あきレンズを用いた小型光ファイバLDV 査読

    池田 裕二, 中島 健, 細川 茂雄, 松本 隆一

    計測自動制御学会論文集   Vol.26, No.6, p605-611   1990年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • A COMPACT FIBER LDV WITH A PERFORATED BEAM EXPANDER 査読

    Y IKEDA, T NAKAJIMA, S HOSOKAWA, R MATSUMOTO

    MEASUREMENT SCIENCE AND TECHNOLOGY   1 ( 3 )   260 - 264   1990年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

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▼全件表示

書籍等出版物

  • マイクロバブル(ファインバブル)のメカニズム・特性制御と実際応用のポイント

    細川 茂雄

    情報機構  2015年3月  ( ISBN:9784865020793

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    記述言語:日本語   著書種別:学術書

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  • 微細気泡の最新技術 Vol.2

    細川 茂雄, 冨山 明男

    エヌ・ティー・エス  2014年8月  ( ISBN:9784860434076

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    記述言語:日本語   著書種別:学術書

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  • 東日本大震災合同調査報告 機械編 日本機械学会編

    細川 茂雄

    丸善出版株式会社  2013年7月 

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    記述言語:日本語   著書種別:調査報告書

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  • 気液二相流技術ハンドブック 日本機械学会編

    細川 茂雄( 担当: 共著)

    コロナ社  2006年5月 

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    記述言語:日本語   著書種別:学術書

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  • 混相流ハンドブック

    細川 茂雄( 担当: 共著)

    朝倉書店  2004年11月 

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    記述言語:日本語   著書種別:学術書

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MISC

  • 時空間フィルタ流速計による界面近傍の流れの計測 招待 査読

    細川 茂雄, 冨山 明男

    ながれ   36 ( 5 )   303 - 308   2017年10月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)   出版者・発行元:日本流体力学会  

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  • 1709 2×2ロッドバンドル内気泡流における乱流特性

    細川 茂雄, 津田 光彦, 小川 勇磨, 冨山 明男

    流体工学部門講演会講演論文集   2015   "1709 - 1"-"1709-2"   2015年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Knowledge of turbulent flows in rod bundles is important for improving safety analysis codes for nuclear reactors. In this study, we therefore measured liquid velocity in single-phase and bubbly flows by installing a small LDV probe into a rod of a 2×2 rod bundle. The local time-averaged velocity and turbulent intensity were obtained from 10,000 instantaneous velocities at each measurement point. The Reynolds shear stress in the rod gap was evaluated from velocity data measured from two directions. The experimental results showed that (1) the turbulence is enhanced due to the presence of bubbles at a low liquid volume flux, whereas the turbulence modification due to bubbles is not clear at a high liquid volume flux, and (2) the Reynolds shear stress can be evaluated by measuring velocities from two different angles between the horizontal plane and the optical axis of the LDV not only for single-phase flow but also for bubbly flow.

    CiNii Books

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  • F051004 時空間フィルタ流速計と応用事例

    細川 茂雄, 冨山 明男

    年次大会 : Mechanical Engineering Congress, Japan   2015   "F051004 - 1"-"F051004-4"   2015年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    We proposed spatiotemporal filter velocimetry (SFV) based on a frequency analysis of time-series spatiotemporally-filtered particle images, which conisits of an imaging system using a highspeed camera and a software program for image processing by a computer. Main features of SFV are (1) velocity of a single tracer particle is measurable, so that accuracy, spatial and temporal resolutions can be as high as LDV, (2) simultaneous measurement of two velocity components is possible at arbitrary multiple points in recorded particle images, (3) it is applicable to flows with low concentration of tracer particles, (4) processing conditions such as an interrogation area, a pattern of spatial filter, a shift frequency and a frequency evaluation method can be easily optimized after recording particle images, (5) translational velocity of a pattern such as bubble and wave velocities can be measured and (6) it is applicable to non-rectangular interrogation regions by using coordinate transformation. In this report, we breifly explain the principle of SFV and present several applications of SFV to demonstrate its potential.

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  • F233 2×2ロッドバンドル内気液二相気泡流の液相速度分布(OS9 熱・流動(6))

    津田 光彦, 小川 勇磨, 細川 茂雄, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2015 ( 20 )   389 - 390   2015年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Knowledge of turbulent flows in rod bundles is important for improving safety analysis codes for nuclear reactors. In this study, we therefore measure liquid velocity in single-phase and bubbly flows by installing a small LDV probe into a rod of a 2×2 rod bundle. The diameter and the pitch of the rods are 10 and 13 mm, respectively. The liquid volume flux is 0.5 m/s and the gas volume flux in the bubbly flow is 0.08 m/s. The local time-averaged velocity and turbulent intensity are obtained from 10,000 instantaneous velocities at each measurement point. Experimental results show that (1) the difference in area-averaged liquid volume fluxes among the subchannles becomes small due to the presence of bubbles, (2) the shear stress on the rod wall strongly depends on the angle from the rod gap due to a non-uniform void distribution, (3) the isotropy of the turbulence is modulated by the presence of bubbles.

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  • B224 気水分離器における液相分離構造が旋回二相流動に及ぼす影響(OS3 軽水炉・新型炉・原子力安全(4))

    上遠野 健一, 船橋 駿斗, 細川 茂雄, 林 公祐, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2015 ( 20 )   239 - 240   2015年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    A downscaled model of a steam separator is used to understand characteristics of swirling flow from the viewpoint of the effects of flow restriction ring (FRR) which is installed in a drainage channel. Main conclusions obtained are as follows. (1) Carryunder performance, the weight percentage of entrained gas in the water leaving the separator, improves by narrowing the flow area in the drainage channel using the FRR because it becomes hard to exhaust the gas. On the other hand, (2) the ratio of the separated flow rate to the liquid flow rate may decrease because the liquid phase climbing over the 1st pick-off ring and scattered droplets increase. Therefore, (3) it is necessary to optimize the FRR design based on the gas-liquid separation performance and pressure-loss performance.

    CiNii Books

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  • 時空間フィルタ流速計による単一液滴に作用する界面せん断応力の評価 招待 査読

    細川 茂雄, 北畑 恭助, 林 公祐, 冨山 明男

    ながれ   33 ( 6 )   509 - 512   2014年12月

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    記述言語:日本語   掲載種別:速報,短報,研究ノート等(学術雑誌)   出版者・発行元:日本流体力学会  

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  • 加圧溶解法における微細気泡生成機構と気泡径分布 招待

    細川 茂雄

    第6回ファインバブル技術講習会資料   20 - 37   2014年11月

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    記述言語:日本語   掲載種別:講演資料等(セミナー,チュートリアル,講習,講義他)  

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  • 0209 鉛直ダクト内気泡流における乱れエネルギ収支計測

    唐澤 弘毅, 細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2014   "0209 - 1"-"0209-2"   2014年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    A measurement method of local instantaneous velocity gradients in turbulent flows are required to evaluate turbulence kinetic energy (TKE) budget. Spatiotemporal Filter Velocimetry (SFV) is therefore applied to evaluation of TKE budget by coupling with a molecular tagging method using photobleaching reaction. Measurements are carried out not only for single-phase turbulent flow but also for bubbly flows with two different bubble diameters to examine effects of bubble diameter on the velocity distribution and TKE budget. As a result, the following conclusions are obtained: (1) Effect of bubble diameter on the distribution of axial mean velocity is weak under the fixed void distribution and the fixed interaction forces between the phases. (2) Effect of bubble diameter on TKE budget is not so large in the bubbly flows whereas the presence of bubbles tend to reduce the magnitudes of the production and diffusion rates.

    CiNii Books

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  • F221 2x2ロッドバンドル内気液二相流の液相速度測定(OS9 熱・流動(5))

    小川 勇磨, 細川 茂雄, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2014 ( 19 )   369 - 370   2014年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    It is important in design and development of reactor cores to increase knowledge of turbulent flows in rod bundles. In this study, we therefore measured velocity in single-phase and bubbly flows by installing a small LDV probe into a rod of a 2x2 rod bundle. The diameter and the pitch of the rods were 10 and 13 mm, respectively. The liquid volume flux was 1 m/s, and the gas volume flux in the bubbly flow was 0.08 m/s. The local time-averaged velocity and turbulent intensity were obtained from 10,000 instantaneous velocities at each measurement point. As a result, the following conclusions were obtained: (1) The distribution of liquid velocity in the bubbly flow is flatter than that in the single-phase flow, and the velocity gradient near the wall increases due to the presence of bubbles. (2) Local wall shear stress on the rod wall depends on the azimuthal localtion, and the distributions of dimensionless liquid velocities near the wall in inner subchannel agree with the universal dimensionless mean velocity profile of wall turbulence.

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  • 822 一様せん断流中単一気泡に働く揚力に関する研究 : 第1報 実験(GS-5 気泡)

    松永 晃, 濱田 剛士, 細川 茂雄, 林 公祐, 冨山 明男

    関西支部講演会講演論文集   2014 ( 89 )   "8 - 26"   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 823 一様せん断流中単一気泡に働く揚力に関する研究 : 第2報 数値計算(GS-5 気泡)

    浜田 剛士, 松永 晃, 林 公祐, 細川 茂雄, 冨山 明男

    関西支部講演会講演論文集   2014 ( 89 )   "8 - 27"   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 807 散気管内外の流れに及ぼす液相粘度の影響(OS-3 流体数値計算と実験計測の展開および産業界への応用(2))

    三平 智之, 林 公祐, 細川 茂雄, 冨山 明男, ゾー ランム

    関西支部講演会講演論文集   2014 ( 89 )   "8 - 11"   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • フォトブリーチング分子タグ法による乱れエネルギ収支の評価 招待

    細川 茂雄, 冨山 明男

    日本機械学会流体工学部門「今この論文が熱い!」   2013年12月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(その他)   出版者・発行元:日本機械学会流体工学部門  

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  • 225 空間フィルタ流速計を用いた液滴速度の測定(OS-2 流体計測技術の向上とその応用(3),オーガナイズド・セッション(OS))

    北畑 恭助, 細川 茂雄, 松本 享明, 冨山 明男

    関西支部講演会講演論文集   2013 ( 88 )   "2 - 30"   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 0502 液侵型LDVのよる気泡流の流速測定(OS5 混相流の多次元可視化計測,オーガナイズドセッション)

    三木原 郁臣, 小嶋 真平, 細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2012   209 - 210   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Presence of interface in gas-liquid two-phase flow makes it difficult to measure liquid velocity using LDV at a high void fraction. In the present study, we have developed small LDV optics to avoid the difficulty in optical access by submerging the LDV probe into a flow field. The diameter of the probe is 7 mm. The developed system is applied to bubbly flow in a bubble column to examine its applicability to bubbly flow at a high void fraction. Comparisons with a conventional LDV system show that the accuracy and reliability of the developed system are the same level as the conventional system, and that the developed system can measure liquid velocity in bubbly flow at high void fractions, in which the conventional LDV cannot measure the liquid velocity. The measured data show that the axial mean velocity and turbulence intensity increase with the gas volumetric flux J_G not only at low JG but also at high J_G.

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  • WS11 空間フィルタ流速計による気泡流の両相速度同時計測(WS1-1 FEDワークショップ 流れ関連物理量の多変量同時計測技術とその応用,ワークショップ)

    細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2012   607 - 608   2012年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Spatial filter velocimetry (SFV) based on spatial filtering of time-series particle images proposed by Hosokawa and Tomiyama is applied to a planar bubble plume to examine its applicability to simultaneous measurement of bubble and liquid velocities. The edge detection process is added in the SFV processing to reduce the size of image pattern and to obtain accurate bubble velocity. Bubble regions in the recorded images of the planer bubble plume are detected by using a labeling process, and the particle and bubble images are generated by masking the bubble region and by inversing the bubble region, respectively. Then, SFV processing is applied to particle and bubble images to obtain liquid and bubble velocities, respectively. The measured results clearly demonstrate the potential of SFV for simultaneous measurements of liquid and gas velocities in two-phase flows.

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  • B112 気水分離器内旋回二相流に関する研究(OS9 熱・流動)

    三賀 丈詩, 松林 利樹, 細川 茂雄, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2012 ( 17 )   53 - 54   2012年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Improvement of steam separators in ABWR is required to decrease pressure drops at high steam qualities without degrading the separation performance. In this study, shapes of the swirler and 1^<st> pick-off ring (POR) were modified to reduce the pressure drop, and experiments using a one-fifth scale model of the separator were carried out to evaluate its performance. Experimental data showed that the modifications successfully reduce the pressure drop and carry-under (CU) in the separator without degrading the separation performance.

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  • B223 ロッドバンドル内液流の乱流特性(OS9 熱・流動)

    古賀 俊一, 山本 泰士, 細川 茂雄, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2012 ( 17 )   287 - 288   2012年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Validation of turbulence models is not an easy task mainly due to lack of experimental data on turbulent flows in rod bundles. In this study, we therefore measured distributions of velocity and turbulence intensities of water flow in a 2x2 rod bundle by using a stereoscopic PIV system. The diameter and pitch of the rods were 20 and 25 mm, respectively. Area-averaged velocity was 2 m/s. Local time-averaged velocity and turbulent intensities were obtained from 10,000 instantaneous velocities at each measurement point. Experimental results showed that horizontal components of turbulence intensity in the cross-section are anisotropic near the rod gap. Since eddies larger than the gap width cannot exist in the rod gap, the turbulence spectrum takes low values in the rod gap compared with center region of subchannel. To the contrary, difference in the turbulence spectrum of eddies smaller than the gap width is small between the rod gap and the center of subchannel.

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  • B121 4x4ロッドバンドル内気液二相気泡流に関する研究(OS9 熱・流動)

    細川 茂雄, 村松 祐哉, 多田 遼, 林 公祐, 冨山 明男

    動力・エネルギー技術の最前線講演論文集 : シンポジウム   2012 ( 17 )   61 - 62   2012年6月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Although area-averaged void fractions in subchannels have been measured frequently in literatures, distribution of local void fraction in a rod bundle have been rarely reported. Little is also known on bubble motion in a rod bundle. Distributions of local void fraction and bubble velocity in a 4x4 rod bundle were, therefore, measured using a conductance probe in this study. Liquid velocity was also measured using LDV. Experimental results showed that the distributions of the void fractions in the inner and side subchannels depend not only on lift force acting on bubbles but also on geometrical interaction between the bubble and the rod wall. The relative velocity between bubbles and liquid phase in the subchannel possesses non-uniform distribution over the cross-section. This is caused by increase in drag force acting on bubbles due to bubble deformation induced by interaction between the bubbles and the rod wall.

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  • 209 加圧溶解式マイクロバブル発生法における気泡発生メカニズムの解明(GS-5・9 気液二相現象(気泡・溶融))

    前田 康成, 山口 重行, 伊藤 良泰, 柴田 尚紀, 細川 茂雄

    関西支部講演会講演論文集   2012 ( 87 )   "2 - 9"   2012年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 711 小型挿入型光ファイバLDVの開発(GS-5・6 流体計測(2))

    内田 拓真, 細川 茂雄, 冨山 明男

    関西支部講演会講演論文集   2012 ( 87 )   "7 - 11"   2012年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 加圧溶解法により生成したマイクロバブルの気泡径分布

    田谷 千尋, 前田 康成, 細川 茂雄, 冨山 明男, 伊藤 良泰, 柴田 尚紀

    混相流 = Japanese journal of multiphase flow   25 ( 5 )   407 - 414   2012年3月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • I133 ボアスコープを用いた空間フィルタ流速計による流速測定(一般講演(6))

    細川 茂雄, 松本 享明, 冨山 明男, 竹森 利和

    熱工学コンファレンス講演論文集   2011   225 - 226   2011年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Endoscopic PIV has been developed to measure flows in opaque equipment. It is however difficult to measure velocities near the edge of the field of view in the endoscopic PIV due to the Lagrangian nature of PIV. The authors developed an Eulerian velocimetry, that is, spatial filter velocimetry (SFV) to realize the simultaneous multipoint measurement of velocity with a high spatial resolution and high accuracy. In this study, we visualized natural convection of water in a pan heated by a cooking stove using a high-speed video camera with a borescope. The velocity distribution in the field of view of the borescope is evaluated by SFV to examine applicability of SFV to measurement of a velocity distribution from the borescope images. The experimental results indicated that SFV can measure the velocity accurately at arbitrary multiple points in the filed of view. The results also demonstrated the high applicability of SFV to the whole field measurement of velocity in the field of view of endoscopic visualization.

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  • 加圧溶解法式による微細気泡の生成メカニズム

    前田 康成, 細川 茂雄, 伊藤 良泰, 柴田 尚紀

    パナソニック電工技報   Vol. 59, No. 2, pp. 4 - 9   2011年6月

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    記述言語:日本語  

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  • 0906 分子タグ法の混相流への適用(OS9-2 混相流の多次元可視化計測,オーガナイズドセッション)

    細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2010   245 - 246   2010年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Most of unintrusive velocimetry techniques utilize fine tracer particles to measure fluid velocity. The addition of tracer particles in multiphase flows induces not only errors due to their imperfect followability but also flow disturbance due to their accumulation at gas-liquid interface. Molecular tagging velocimetry (MTV) is one of recommendable methods to remove these difficulties. Some applications of MTV are introduced to demonstrate its advantages.

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  • フォトブリーチング反応を用いた分子タグ法による速度と速度勾配の同時計測

    細川 茂雄

    日本機械学会RC237先端的熱流体計測法に関する研究分科会研究報告書   pp. 224 - 238   2010年6月

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    記述言語:日本語  

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  • 1106 気泡誘起擬似乱れに関する研究(GS-5 混相流-気泡)

    加藤 宏俊, 細川 茂雄, 冨山 明男

    関西支部講演会講演論文集   2010 ( 85 )   "11 - 6"   2010年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 鉛直ダクト内気泡流における乱れエネルギ収支(混相(1),一般講演)

    細川 茂雄, 鈴木 孝, 冨山 明男

    日本流体力学会年会講演論文集   2010   189 - 189   2010年

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    記述言語:日本語   出版者・発行元:日本流体力学会  

    A molecular tagging velocimetry based on photobleaching reaction was applied to turbulent bubbly flows with sub-millimeter bubbles in a vertical square duct to examine the applicability of the κ-ε models to the bubbly flows. The conclusions obtained are as follows: (1) The κ-ε models can reasonably evaluate the production rate of turbulence kinetic energy (TKE) in bubbly flows. (2) Bubbles agitate the liquid flow and enhance the diffusion rate of TKE. The enhancement of the diffusion due to bubbles has different characteristics from the diffusion enhancement due to shear-induced turbulence, and the κ-ε models cannot evaluate the enhancement of diffusion rate due to bubbles in the near wall region. (3) The κ-ε models give not so bad predictions for the production, diffusion and dissipation rates of dissipation rate of TKE.

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  • 0901 鉛直ダクト内乱流の乱れエネルギ収支に及ぼす気泡の影響(OS9-1 先端的熱流体計測法,オーガナイズドセッション)

    鈴木 孝, 細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2009   305 - 306   2009年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    Since the conservation equation of turbulence kinetic energy (TKE) involves correlations among local instantaneous gradients of fluctuating velocities, it is indispensable to measure the velocity gradients as well as the velocity components. The authors developed a molecular tagging method using photobleaching (PB-MTV), which can measure not only velocity but also its gradient by making use of the translation and deformation of a tag. In this study, we applied the PB-MTV to turbulent bubbly flows in a square duct. The experimental results indicate that position of turbulence transition between viscous sub-layer and log region shifts toward the wall by the presence of bubbles. The presence of bubbles increases not only the production rate but also the dissipation rate of TKE. The enhancements in the production and the dissipation rates are well correlated with the local void fraction.

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  • 111 一様せん断流中単一液滴に作用する力に関する研究(OS-5 界面が関わる複雑熱流体現象(5))

    東野 浩之, 石井 大貴, 細川 茂雄, 冨山 明男

    関西支部講演会講演論文集   2009 ( 84 )   "1 - 11"   2009年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 圧力噴射弁のノズル内キャビテーション流れ

    五島代介, 宋明良, 細川茂雄, 冨山明男

    日本混相流学会年会講演会講演論文集   2009   2009年

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  • 第12回オーガナイズド混相流フォーラム (OMF2008-Nara) 報告

    細川 茂雄, 大川 富雄, 宋 明良

    混相流 = Japanese journal of multiphase flow   22 ( 4 )   452 - 454   2008年12月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • 14th International Symposium on Application of Laser Techniques to Fluid Mechanics 参加報告

    細川 茂雄

    混相流 = Japanese journal of multiphase flow   22 ( 3 )   287 - 289   2008年9月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • 光学的流速計測の基礎 −LDVとPIVの概説と適用事例−

    細川 茂雄

    機械の研究   第60巻,第8号, pp. 850 - 860   2008年7月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

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  • 部分長燃料棒を有するロッドバンドル内気液二相流

    水谷義隆, 細川茂雄, 宋明良, 冨山明男

    日本混相流学会年会講演会講演論文集   2008   2008年

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  • ノズル内キャビテーションと液体噴流に及ぼすノズル長さの影響

    礒崎健二, 宋明良, 細川茂雄, 冨山明男

    微粒化シンポジウム講演論文集   17th   2008年

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  • Dimensionless Index for Cavitation in Nozzles of Various Geometries

    MAULANA Muhammad Ilham, ISOZAKI Kenji, SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization   16   321 - 324   2007年12月

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    記述言語:英語  

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  • 313 フォトブリーチング分子タグ法によるダクト内乱流の計測(FM-1 熱流体計測の新展開)

    小林 敦希, 細川 茂雄, 冨山 明男

    関西支部講演会講演論文集   2007 ( 82 )   "3 - 19"   2007年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 鉛直管内気泡乱流の数値予測

    橋本将平, 細川茂雄, 冨山明男, 宋明良

    日本機械学会関西支部定時総会講演会講演論文集   82nd   2007年

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  • ノズル内キャビテーションと噴流微粒化に及ぼすノズル形状と寸法の影響

    宋明良, MAULANA Muhammad Ilham, 礒崎健二, 細川茂雄, 冨山明男

    日本混相流学会年会講演会講演論文集   2007   2007年

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  • スワール噴射弁により形成される非定常噴霧に及ぼす雰囲気ガス密度の影響

    細川 茂雄, 宋 明良, MUHAMMAD Ilham Maulana, 冨山 明男

    可視化情報学会誌. Suppl.   26 ( 1 )   303 - 304   2006年7月

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    記述言語:日本語  

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  • 二次元ノズル内キャビテーションの液体噴流微粒化に及ぼす影響

    前田達利, ILHAM Maulana Muhammad, 宋明良, 細川茂雄, 冨山明男

    日本混相流学会年会講演会講演論文集   2006   2006年

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  • 2005年度日本混相流学会学生会夏期セミナー

    細川 茂雄, 林 司, 日向 大輔, 吉澤 徹

    混相流   19 ( 4 )   361 - 364   2005年12月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • 2508 障害物を含む鉛直ダクト内高速流中小気泡の運動(OS-25B,OS-25 混相流および界面挙動の数値解析)

    張 政, 片岡 宏庸, 牧野 泰, 冨山 明男, 細川 茂雄

    計算力学講演会講演論文集   2005 ( 18 )   813 - 814   2005年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • 610 マイクロバブルの気泡径・速度同時計測(OS6-3 気液系流れの計測(3),OS6 気液系流れの計測,オーガナイズドセッション)

    赤川 純一, 細川 茂雄, 冨山 明男, 六嶋 一雅, 山口 重行, 前田 康成

    流体工学部門講演会講演論文集   2005   84 - 84   2005年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    To understand generation process of micro bubbles, two-phase flow in a two-dimensional nozzle was visualized by using a high-speed camera and the bubble diameter and the velocity were measured by a phase Doppler anemometry. As a results, it was confirmed that (1) the micro bubbles were generated by cavitation and bubble break-up of lager bubbles in the nozzle, (2) the bubble diameter was decreases with increasing liquid flow rate, and (3) the phase Doppler anemometry is of use to understand the generation mechanism of micro-bubble.

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  • 608 スワールインジェクタの噴霧特性に及ぼす雰囲気密度の影響(OS6-2 気液系流れの計測(2),OS6 気液系流れの計測,オーガナイズドセッション)

    野村 亮介, 宋 明良, 細川 茂雄, 冨山 明男

    流体工学部門講演会講演論文集   2005   82 - 82   2005年10月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

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  • フォトブリーチンク分子タグ法による速度・速度勾配の同時計測

    細川 茂雄, 赤川 純一, 冨山 明男

    可視化情報学会誌. Suppl.   25 ( 1 )   21 - 22   2005年3月

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    記述言語:日本語  

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  • キャビテーション数とレイノルズ数が2次元ノズル内キャビテーションに及ぼす影響—Effects of the cavitation and Reynolds numbers on cavitating flow in a two-dimensional nozzle

    宋 明良, Muhammad Ilham Maulana, 細川 茂雄

    混相流研究の進展 = Progress in multiphase flow research : 年会講演会論文精選集   ( 1 )   65 - 70   2005年

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    記述言語:日本語   出版者・発行元:[大阪] : 日本混相流学会  

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    その他リンク: http://id.ndl.go.jp/bib/9353666

  • ロッドバンドル内気液二相流の流動様式に関する研究

    水谷義隆, 坪泰司, 三島嘉一郎, 工藤義郎, 宋明良, 細川茂雄, 冨山明男

    日本混相流学会年会講演会講演論文集   2005   2005年

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  • 2次元ノズル内キャビテーション乱流と液体微粒化に及ぼす影響

    宋明良, 濁川慎司, 前田達利, 冨山明男, 細川茂雄

    日本混相流学会年会講演会講演論文集   2005   2005年

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  • ノズル内キャビテーション流れの可視化とLDV計測

    宋 明良, 濁川 慎司, 冨山 明男, 細川 茂雄, 松本 洋一郎

    微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization   13   167 - 172   2004年12月

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    記述言語:日本語  

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  • ICMF-2004雑用日記

    冨山 明男, 細川 茂雄

    混相流   18 ( 4 )   376 - 377   2004年12月

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    記述言語:日本語  

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  • 2004年度日本混相流学会学生優秀講演賞表彰報告

    細川 茂雄, 井口 大亮, 真田 俊之, 田川 義之, 濁川 慎司, 林 公祐, 宮本 悠樹, MYINT Win

    混相流   18 ( 4 )   364 - 366   2004年12月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • 2004年度日本混相流学会学生会夏期セミナー

    細川 茂雄, 吉田 太一, 大石 義彦, 赤川 純一

    混相流   18 ( 4 )   360 - 363   2004年12月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

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  • 二酸化炭素-水系鉛直管内気泡流に関する研究

    嶋敏秀, 白井正貴, 冨山明男, 細川茂雄, 宋明良

    日本混相流学会年会講演会講演論文集   2004   2004年

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  • インジェクタのノズル内キャビテーションと液体噴流の可視化

    濁川慎司, 宋明良, 冨山明男, 細川茂雄, 松本洋一郎

    日本混相流学会年会講演会講演論文集   2004   2004年

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  • 2003年度日本混相流学会学生優秀講演賞表彰報告

    細川 茂雄

    混相流 = Japanese journal of multiphase flow   17 ( 4 )   430 - 432   2003年12月

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    記述言語:日本語   出版者・発行元:日本混相流学会  

    CiNii Books

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  • 光学計測

    細川 茂雄

    日本原子力学会二相流計測技術講習会   未記入   2003年10月

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    記述言語:日本語  

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  • 熱流体計測の基礎と応用-流体計測技術

    細川 茂雄

    日本機械学会関西支部第265回講習会   2003年

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    記述言語:日本語  

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  • 鉛直流路内気泡の上昇速度に関する研究

    三橋真人, 冨山明男, 細川茂雄, 宋明良

    日本混相流学会年会講演会講演論文集   2003   2003年

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  • 気泡塔内ボイド率分布の数値計算

    石田洋平, 島田直樹, 冨山明男, 細川茂雄

    日本混相流学会年会講演会講演論文集   2002   2002年

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  • 557 気泡挙動の格子ボルツマンシミュレーション

    高田 尚樹, 冨山 明男, 細川 茂雄

    計算力学講演会講演論文集   2000 ( 13 )   597 - 598   2000年11月

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    記述言語:日本語   出版者・発行元:一般社団法人日本機械学会  

    CiNii Books

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  • 擬似2次元気泡背後の変動流れの計測

    細川 茂雄, 石田 健, 冨山 明男

    年会一般講演   18   255 - 256   1999年7月

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    記述言語:日本語  

    CiNii Books

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  • 単一気泡の wake 構造

    細川茂雄

    機械学会講演論文集, 1999   1999年

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  • A-3 水素ラム燃焼器内の燃焼流れ(燃焼I)

    斉藤 剛, 細川 茂雄, 池田 裕二, 中島 健, 黒沢 要治, 田丸 卓

    ガスタービン定期講演会講演論文集   ( 21 )   17 - 24   1993年5月

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    記述言語:日本語   出版者・発行元:公益社団法人日本ガスタービン学会  

    CiNii Books

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  • A-2 燃料噴射を伴うVガッタ後流の流れ構造(燃焼I)

    細川 茂雄, 池田 裕二, 斉藤 剛, 中島 健

    ガスタービン定期講演会講演論文集   ( 21 )   9 - 16   1993年5月

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    記述言語:日本語   出版者・発行元:公益社団法人日本ガスタービン学会  

    CiNii Books

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  • A-16 高速流中におかれたVガッタ後流の乱流特性

    細川 茂雄, 池田 裕二, 湊 將志, 中島 健

    ガスタービン定期講演会講演論文集   ( 20 )   115 - 122   1992年5月

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    記述言語:日本語   出版者・発行元:公益社団法人日本ガスタービン学会  

    CiNii Books

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▼全件表示

講演・口頭発表等

  • Optical Measurements for Validation of Numerical Simulation of Two-Phase Flow 国際会議

    HOSOKAWA SHIGEO

    4rd Workshop on Advances in CFD and LB Modeling of Interface Dynamics in Capillary Two-Phase Flows  2019年5月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Rio de Janeiro, Brazil  

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  • Spatiotemporal Filter Velocimetry: Fundamentals and Applications 招待 国際会議

    HOSOKAWA SHIGEO

    Multiphase Flow Journey 2019 (JEM2019)  2019年5月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Rio de Janeiro, Brazil  

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  • Three-Dimensional Flow Characteristics around a Bulge Structure in a Cavity Swept by a Viscoelastic Fluids 国際会議

    SUZUKI Hiroshi, KAWATA Masaki, HIDEMA Ruri, HOSOKAWA Shigeo, HAYASHI Kosuke, TOMIYAMA Akio

    Annual European Rheology Conference 2019 (AERC 2019)  2019年4月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Portorož, Slovenia  

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  • 単一液滴に作用する力の実験的分析

    重兼 楽, 細川 茂雄, 林 公祐, 冨山 明男

    第95期日本機械学会流体工学部門講演会  2018年11月  日本機械学会

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    記述言語:日本語   会議種別:ポスター発表  

    開催地:室蘭  

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  • Experimental Evaluation of Adsorption of Surfactant at Moving Interface 国際会議

    HOSOKAWA SHIGEO

    2nd International COFTEC Symposia  2018年10月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kobe, Japan  

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  • Optical Measurements for Validation of Numerical Simulation of Two-Phase Flow 国際会議

    HOSOKAWA SHIGEO

    3rd Workshop on Advances in CFD and LB Modeling of Interface Dynamics in Capillary Two-Phase Flows  2018年10月 

     詳細を見る

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Kobe, Japan  

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  • カーボンニュートラルとバイオ燃料について考える

    細川 茂雄

    日本機械学会年次大会市民フォーラム  2018年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 可溶性界面活性剤により汚染された球形液滴の数値シミュレーション

    林 公祐, 酒井 航平, 細川 茂雄, 冨山 明男

    日本流体力学会年会2018  2018年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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  • U字管内気液二相流の圧力損失に及ぼす液相粘度の影響

    林 公祐, 鈴木 大貴, 細川 茂雄, 冨山 明男

    混相流シンポジウム2018  2018年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • 上端シャープエッジ鉛直管における気液二相対向流の界面及び壁面摩擦係数

    島村 長幸, 合田 頼人, 林 公祐, 細川 茂雄, 村瀬 道雄, 西田 浩二, 冨山 明男

    混相流シンポジウム2018  2018年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • 鉛直円管内単一二酸化炭素気泡の物質移動に及ぼすアルコールと電解質の相互作用の影響

    廣田 雄嵩, 堀 陽平, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2018  2018年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • サブクール沸騰による微細気泡生成

    細川 茂雄, 吉田 真崇, 冨山 明男, 前田 康成, 穐田 朋弘

    混相流シンポジウム2018  2018年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • 高温金属球浸漬冷却過程の熱伝達におよぼす微細気泡の影響

    細川 茂雄, 福田 龍, 冨山 明男, 戸島 正剛

    第23回動力・エネルギー技術シンポジウム  2018年6月  日本機械学会動力エネルギーシステム部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:宇部  

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  • エバネッセント波の干渉を用いた固液界面近傍におけるコロイド粒子流動速度の計測

    白井 克明, 梶 祥一朗, 細川 茂雄, 川南 剛, 平澤 茂樹

    日本機械学会情報・知能・精密機器部門講演会  2018年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:川越  

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  • 界面を含む流れの計測 招待

    細川 茂雄

    化学工学会第83年会 粒子流体プロセス部会セミナー  2018年3月  化学工学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:大阪  

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  • U字管内気液二相流の圧力損失に関する研究

    鈴木 大貴, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2017  2017年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 鉛直円管内旋回気液二相流の圧力損失に関する研究

    船橋 駿斗, 木下 博仁, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2017  2017年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 周期加熱による微細気泡生成法

    吉田 真崇, 細川 茂雄, 冨山 明男, 前田 康成

    混相流シンポジウム2017  2017年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 二相流数値計算検証のための実験計測

    細川 茂雄, 林 公祐, 冨山 明男

    日本機械学会研究分科会RC270第3回分科会  2016年12月  日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(指名)  

    開催地:東京  

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  • 時空間フィルタ流速計による界面活性剤の吸着を伴う液滴の測定

    細川 茂雄, 益倉 侑冶, 林 公祐, 冨山 明男

    第94期日本機械学会流体工学部門講演会  2016年11月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • 鉛直ダクト内上昇気泡流の乱れエネルギ収支

    岩井 遼介, 細川 茂雄, 冨山 明男

    日本流体力学会年会2016  2016年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋  

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  • 加圧溶解泡による微細気泡の生成機構と特性

    細川 茂雄

    第 2 回微細気泡研究会  2016年8月 

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    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:東京  

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  • 鉛直円管内電解質水溶液中単一二酸化炭素気泡の物質移動に関する研究

    堀 陽平, 青木 二郎, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2016  2016年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • U字管内気液二相流の圧力損失に関する研究

    宮地 祥人, 林 公祐, 細川 茂雄, 冨山 明男, 舘山 将也, 廣津 誠, 竹田 信宏

    混相流シンポジウム2016  2016年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • 流れの光学計測よもやま話

    細川 茂雄

    日本混相流学会若手研究者夏季セミナー  2016年8月  日本混相流学会

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    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:高槻  

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  • 静止液中単一気泡の形状におよぼす界面活性剤の影響に関する研究

    竹川 稔彦, 青山 昌平, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2016  2016年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

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  • 2x2ロッドバンドル内気泡流における乱流特性泡流の液相速度分布

    細川 茂雄, 津田 光彦, 小川 勇磨, 冨山 明男

    第93期日本機械学会流体工学部門講演会  2015年11月  日本機械学会流体工学部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 時空間フィルタ流速計の基礎と応用事例 招待

    細川 茂雄

    冷凍空調学会研究会  2015年11月  冷凍空調学会

     詳細を見る

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(指名)  

    開催地:東京  

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  • 球形液滴界面への界面活性剤の吸着に関する研究

    益倉 侑冶, 細川 茂雄, 林 公祐, 冨山 明男

    日本流体力学会年会2015  2015年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 時空間フィルタ流速計と応用事例 招待

    細川 茂雄, 冨山 明男

    日本機械学会2015年度年次大会  2015年9月  日本機械学会

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    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(指名)  

    開催地:札幌  

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  • 境界適合型時空間フィルタ流速計と界面活性剤濃度評価の試み

    細川 茂雄, 林 公祐, 冨山 明男

    日本機械学会研究分科会RC263第6回分科会  2015年9月  日本機械学会

     詳細を見る

    記述言語:日本語   会議種別:シンポジウム・ワークショップ パネル(指名)  

    開催地:東京  

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  • 汚染系単一球形液滴に作用するマランゴニ応力の実験的評価

    益倉 侑冶, 細川 茂雄, 林 公祐, 冨山 明男

    混相流シンポジウム2015  2015年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:高知  

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  • 一様せん断流中単一気泡に働く揚力に関する研究

    青山 昌平, 竹川 稔彦, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2015  2015年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:高知  

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  • サブクール水中における蒸気凝縮音に関する研究

    池内 和孝, 舘山 将也, 林 公祐, 細川 茂雄, 冨山 明男, 廣津 誠, 竹田 信宏

    混相流シンポジウム2015  2015年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:高知  

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  • 気水分離器における液相分離構造が旋回二相流動に及ぼす影響

    上遠野 健一, 船橋 駿斗, 細川 茂雄, 林 公祐, 冨山 明男

    第20回動力・エネルギー技術シンポジウム  2015年6月  日本機械学会動力エネルギーシステム部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • 2x2ロッドバンドル内気液二相流の乱流特性

    津田 光彦, 小川 勇磨, 細川 茂雄, 冨山 明男

    第21回動力・エネルギー技術シンポジウム  2015年6月  日本機械学会動力エネルギーシステム部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜  

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  • 2x2ロッドバンドル内気液二相気泡流の液相速度分布

    津田 光彦, 小川 勇磨, 細川 茂雄, 冨山 明男

    第20回動力・エネルギー技術シンポジウム  2015年6月  日本機械学会動力エネルギーシステム部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:仙台  

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  • 冷却材喪失事故時の格納容器内温度シミュレーションモデルの検証;(2)空気及び蒸気吹込み実験

    野末 貴大, 藤井 雄基, 林 公祐, 細川 茂雄, 冨山 明男, 歌野原 陽一, 山本 泰功, 村瀬 道雄

    日本原子力学会 春の大会 2015  2015年3月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:茨城  

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    細川 茂雄

    第6回ファインバブル技術講習会  2014年11月 

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    記述言語:日本語   会議種別:公開講演,セミナー,チュートリアル,講習,講義等  

    開催地:東京  

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  • 鉛直ダクト内気泡流における乱れエネルギ収支計測

    唐澤 弘毅, 細川 茂雄, 冨山 明男

    第92期流体工学部門講演会  2014年10月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:富山県富山市  

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  • 時空間フィルタ流速計による界面近傍速度測定

    細川 茂雄, 北畑 恭助, 林 公祐, 冨山 明男

    理論応用力学講演会  2014年9月  日本学術会議

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京都  

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  • 時空間フィルタ流速計による単一液滴に作用する界面せん断応力の評価

    細川 茂雄, 北畑 恭助, 林 公祐, 冨山 明男

    日本流体力学会年会2014  2014年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:宮城県仙台市  

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  • 加圧溶解型微細気泡発生法におけるサブミクロン気泡の発生

    馬場 悠司, 細川 茂雄, 冨山 明男, 伊藤 良泰, 前田 康成

    混相流シンポジウム2014  2014年7月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • スラリー気泡塔における気泡合体に粒子径が及ぼす影響

    小嶋 真平, 佐々木 翔平, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2014, B232, USB Memory (2 pages)  2014年7月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • U字ベンドにおける空気水系気液二相流の圧力損失に関する研究

    小林 慎吾, 林 公祐, 細川 茂雄, 冨山 明男, 廣津 誠, 舘山 将也, 竹田 信宏

    混相流シンポジウム2014, B223, USB Memory (2 pages)  2014年7月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • 2x2ロッドバンドル内気液二相流の液相速度測定

    小川 勇磨, 細川 茂雄, 冨山 明男

    第19回動力・エネルギー技術シンポジウム  2014年6月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福井  

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  • リフラックス冷却における蒸気発生器U字管での熱流体挙動(7)逆U字管での凝縮実験

    野末 貴大, 藤井 雄基, 土井 大我, 細川 茂雄, 冨山 明男, 楠木 貴世志, 村瀬 道雄

    日本原子力学会2014年春の大会  2014年3月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 一様せん断流中単一気泡に働く揚力に関する研究(第 1 報 実験)

    松永 晃, 濱田 剛士, 細川 茂雄, 林 公祐, 冨山 明男

    日本機械学会 関西支部第89期定時総会講演会  2014年3月  日本機械学会関西支部

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 散気管内外の流れに及ぼす液相粘度の影響

    三平 智之, 林 公祐, 細川 茂雄, 冨山 明男, ラン ムゾー

    日本機械学会関西支部定時総会・講演会2014  2014年3月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪府立大学  

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  • 一様せん断流中単一気泡に働く揚力に関する研究 (第2 報 数値計算)

    濵田 剛士, 松永 晃, 林 公祐, 細川 茂雄, 冨山 明男

    日本機械学会関西支部定時総会・講演会2014  2014年3月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪府立大学  

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  • 流速測定における新しいアプローチ—Imaging Spatial Filter Velocimetry (iSFV)— 招待

    細川 茂雄, 冨山 明男

    関西伝熱セミナー  2013年9月 

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:神戸  

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  • 空間フィルタ流速計による単一液滴内外速度の測定

    北畑 恭助, 細川 茂雄, 冨山 明男

    日本流体力学会年会2013  2013年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 気水分離器内旋回二相流に関する研究 (2) ピックオフリングの改良

    田丸 隼人, 三賀 丈詩, 細川 茂雄, 冨山 明男

    日本原子力学会2013年秋の大会  2013年9月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:八戸  

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  • 気水分離器内旋回二相流に関する研究 (1) 流動と分離特性

    三賀 丈詩, 田丸 隼人, 細川 茂雄, 冨山 明男

    日本原子力学会2013年秋の大会  2013年9月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:八戸  

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  • リフラックス冷却における蒸気発生器U字管での熱流体挙動(4)下端CCFL蒸気・水実験

    藤井 雄基, 土井 大我, 細川 茂雄, 冨山 明男, 川崎 郁夫, 村瀬 道雄

    日本原子力学会2013年秋の大会  2013年9月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:八戸  

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  • 加圧溶解法により生成した微細気泡の経時変化

    藤本 秀大, 石井 和哉, 細川 茂雄, 冨山 明男, 伊藤 良泰, 前田 康成

    混相流シンポジウム2013  2013年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:長野  

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  • 鉛直円管内CO2気泡周りの濃度分布計測

    細田 将吾, 青木 二郎, 林 公祐, 細川 茂雄, 冨山 明男

    混相流シンポジウム2013  2013年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:長野  

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  • 気泡塔内ボイド率・液相速度分布の計測と数値予測

    小嶋 真平, 三木原 郁臣, 細川 茂雄, 冨山 明男

    混相流シンポジウム2013  2013年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:長野  

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  • V字管内のスラッギング現象に関する研究

    入倉 基樹, 前川 宗則, 細川 茂雄, 冨山 明男

    化学工学会第78年会  2013年3月  化学工学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 分子タグ法と空間フィルタ流速計の融合による気泡流の速度計測

    細川 茂雄, 池田 聡, 冨山 明男

    第62回理論応用力学講演会  2013年3月  日本学術会議

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 空間フィルタ流速計による液滴速度の測定

    北畑 恭助, 松本 享明, 細川 茂雄, 冨山 明男

    日本機械学会 関西支部第88期定時総会講演会  2013年3月  日本機械学会関西支部

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • リフラックス冷却における蒸気発生器U字管での熱流体挙動(2) 鉛直管下端における気液対向流制限に関する研究

    藤井 雄基, 土井 大我, 細川 茂雄, 冨山 明男, 川崎 郁夫, 村瀬 道雄

    日本原子力学会2013年春の大会  2013年3月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 空間フィルタ流速計による3D3C速度計測

    細川 茂雄, 冨山 明男

    日本機械学会研究分科会RC254第3回分科会  2012年12月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸市  

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  • 液侵型LDVによる気泡流の流速測定

    三木原 郁臣, 細川 茂雄, 冨山 明男

    第90期日本機械学会流体工学部門講演会  2012年11月  日本機械学会流体工学部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都  

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  • 空間フィルタ流速計による気泡流の両相速度同時計測

    細川 茂雄, 冨山 明男

    第90期日本機械学会流体工学部門講演会  2012年11月  日本機械学会流体工学部門

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:京都  

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  • ダクト内乱流に及ぼす気泡の影響

    細川 茂雄, 池田 聡, 冨山 明男

    日本流体力学会年会2012  2012年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:高知  

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  • 鉛直管下端における気液対向流制限に関する研究

    土井 大我, 川崎 郁夫, 村瀬 道雄, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2012  2012年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:千葉  

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  • 鉛直ダクト内気泡流における乱流特性

    池田 聡, 松本 享明, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2012  2012年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:千葉  

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  • 加圧溶解法におけるサブマイクロ気泡の生成に関する研究

    石井 和哉, 前田 康成, 細川 茂雄, 冨山 明男, 伊藤 良泰

    日本混相流学会年会講演会2012  2012年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:千葉  

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  • 4x4ロッドバンドル内気液二相気泡流に関する研究

    細川 茂雄, 村松 祐哉, 多田 遼, 林 公祐, 冨山 明男

    第17回動力・エネルギー技術シンポジウム  2012年6月  日本機械学会動力・エネルギー部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡  

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  • 気水分離器内旋回二相流に関する研究

    三賀 丈詩, 松林 利樹, 細川 茂雄, 冨山 明男

    第17回動力・エネルギー技術シンポジウム  2012年6月  日本機械学会動力・エネルギー部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡  

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  • ロッドバンドル内液流の乱流特性

    古賀 俊一, 山本 泰士, 細川 茂雄, 冨山 明男

    第17回動力・エネルギー技術シンポジウム  2012年6月  日本機械学会動力・エネルギー部門

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福岡  

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  • 小型挿入型光ファイバLDVの開発

    内田 拓真, 細川 茂雄, 冨山 明男

    日本機械学会関西支部第87期定時総会講演会  2012年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 分子タグ法と空間フィルタ流速計による速度場の詳細測定

    細川 茂雄, 冨山 明男

    JAXA第7回学際領域における分子イメージングフォーラム  2011年11月  JAXA

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:東京  

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  • ボアスコープを用いた空間フィルタ流速計による流速測定

    細川 茂雄, 松本 享明, 冨山 明男, 竹森 利和

    日本機械学会熱工学コンファレンス2011  2011年10月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:浜松  

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  • 鉛直矩形ダクト内気泡乱流における乱れエネルギ収支

    細川 茂雄, 水本 博貴, 冨山 明男

    日本流体力学会年会2011  2011年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 加圧溶解法で生成したマイクロバブルの気泡径分布

    前田 康成, 田谷 千尋, 細川 茂雄, 冨山 明男, 伊藤 良泰, 柴田 尚紀

    日本混相流学会年会2011  2011年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都  

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  • 4x4ロッドバンドル内気液二相気泡流に関する研究

    村松 祐哉, 細川 茂雄, 林 公祐, 冨山 明男

    日本混相流学会年会2011, pp. 144-145  2011年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都  

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  • 空間フィルタ流速計による気泡速度の測定

    細川 茂雄, 佐藤 弘泰, 松本 享明, 林 公祐, 冨山 明男

    日本混相流学会年会2011, pp. 354-355  2011年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都  

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  • 乱流における速度の詳細計測

    細川 茂雄, 冨山 明男

    日本混相流学会混相流フォーラム関西・混相流の産業利用研究分科会講演会  2011年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:大阪  

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  • 2×2ロッドバンドル内乱流の速度分布

    山本 泰士, 細川 茂雄, 冨山 明男

    日本機械学会動力エネルギーシンポジウム  2011年6月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:吹田  

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  • 分子タグ法の混相流への適用

    細川 茂雄, 冨山 明男

    日本機械学会第88期流体工学部門講演会  2010年10月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:米沢  

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  • フォトブリーチング分子タグ法による気泡乱流の計測

    細川 茂雄, 冨山 明男

    日本機械学会年次大会講演会  2010年9月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:名古屋  

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  • 時系列デジタル画像を用いた空間フィルタ流速計

    坂本 博紀, 細川 茂雄, 冨山 明男

    日本機械学会年次大会講演会  2010年9月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋  

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  • 鉛直ダクト内気泡流における乱れエネルギ収支

    細川 茂雄, 鈴木 孝, 冨山 明男

    日本流体力学会年会2010  2010年9月  日本流体力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • Experimental Study on Temperature Fluctuation Phenomena in a Closed Branch Pipe Connecting to High Velocity and High Temperature Flow in a Main Pipe 国際会議

    TAKENAKA Nobuyuki, HOSOKAWA Shigeo, SAITO Atsushi, OUMAYA Toru, NAKAMURA Akira, MIYOSHI Koji

    14th International Heat Transfer Conference  2010年8月  American Society of Mechanical Engineers

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    記述言語:英語   会議種別:ポスター発表  

    開催地:Washington  

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  • 加圧溶解法より発生した微細気泡の気泡径・数密度に関する研究

    田谷 千尋, 細川 茂雄, 冨山 明男, 前田 康成, 山口 重行, 伊藤 良泰

    日本混相流学会年会講演会2010  2010年7月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:浜松  

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  • 気泡誘起擬似乱れに関する研究

    加藤 宏俊, 細川 茂雄, 冨山 明男

    日本機械学会関西支部第85期定時総会講演会  2010年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸  

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  • 気液二相気泡流における乱流特性

    細川 茂雄, 冨山 明男, 細川 茂雄

    オーガナイズド混相流フォーラム2009  2009年11月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:名古屋  

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  • 鉛直ダクト内乱流の乱れエネルギ収支に及ぼす気泡の影響

    鈴木 孝, 細川 茂雄, 冨山 明男

    日本機械学会第87期流体工学部門講演会  2009年11月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋  

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  • フォトブリーチング分子タグ法による気泡乱流の計測

    細川 茂雄, 冨山 明男

    日本機械学会関西支部流体工学懇話会  2009年11月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸  

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  • 気泡流の光学計測

    細川 茂雄, 冨山 明男

    化学工学会第41回秋季大会  2009年9月  化学工学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:広島大学  

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  • 部分長燃料棒を有するロッドバンドル内の圧力損失

    太田 基希, 林 公祐, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2009  2009年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:熊本  

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  • 加圧溶解型微細気泡生成法における液相流束および溶存気体量が気泡径・数密度に及ぼす影響

    細川 茂雄, 田中 健三, 冨山 明男, 前田 康成, 山口 重行, 伊藤 良泰

    日本混相流学会年会講演会2009  2009年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:熊本  

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  • 圧力噴射弁のノズル内キャビテーション流れ

    五島 代介, 宋 明良, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2009  2009年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:熊本  

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  • フォトブリーチング分子タグ法による速度と速度勾配の同時測定

    細川 茂雄, 冨山 明男

    日本機械学会RC237「先端的熱流体計測法に関する研究分科会」  2009年5月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋大学  

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  • ダクト内気泡乱流場の乱れエネルギー収支

    福永 貴之, 鈴木 孝, 細川 茂雄, 冨山 明男

    日本機械学会関西支部第84期定時総会講演会  2009年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 一様せん断流中単一液滴に作用する力に関する研究

    東野 浩之, 石井 大貴, 細川 茂雄, 冨山 明男

    日本機械学会関西支部第84期定時総会講演会  2009年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • ノズル内キャビテーションと液体噴流に及ぼすノズル長さの影響

    礒崎 健二, 宋 明良, 細川 茂雄, 冨山 明男

    第17回微粒化シンポジウム  2008年12月  日本液体微粒化学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:横浜  

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  • 気泡乱流場における乱れエネルギー収支の計測

    細川 茂雄, 冨山 明男

    日本機械学会関西支部秋季技術交流フォーラム  2008年10月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都  

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  • マイクロバブルの気泡径に及ぼす混入気泡の影響

    田中 健三, 細川 茂雄, 冨山 明男, 山口 重行, 前田 康成, 伊藤 良泰

    日本混相流学会年会講演会2008  2008年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:会津  

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  • PWRホットレグを模擬した矩形流路での気液対向流(流動状態の数値解析)

    南 則敏, 村瀬 道雄, 歌野原 陽一, 冨山 明男, 細川 茂雄

    日本混相流学会年会講演会2008  2008年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:会津  

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  • PWRホットレグを模擬した矩形流路での気液対向流(運動量式に基づくCCFL特性の計算)

    村瀬 道雄, 南 則敏, 西脇 大祐, 冨山 明男, 細川 茂雄

    日本混相流学会年会講演会2008  2008年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:会津  

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  • 部分長燃料棒を有するロッドバンドル内気液二相流

    水谷 義隆, 細川 茂雄, 宋 明良, 冨山 明男

    日本混相流学会年会講演会2008  2008年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:会津  

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  • 神戸大学機械工学科におけるものづくり導入教育

    浅野 等, 田川 雅人, 細川 茂雄, 日和 千秋, 安達 和彦

    平成20年度工学・工業教育研究講演会  2008年8月  日本工学教育協会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸  

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  • 光強度勾配を用いた3次元PIVに関する研究

    佐治 彰啓, 細川 茂雄, 冨山 明男

    日本機械学会関西支部 第83期定時総会講演会  2008年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • Dimensionless Index for Cavitation in Nozzles of Various Geometries

    Muhammad Ilham Maulana, ISOZAKI Kenji, SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    第16回微粒化シンポジウム  2007年12月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • LDV計測

    細川 茂雄

    日本機械学会関西支部第291回講習会  2007年9月  日本機械学会

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    記述言語:日本語  

    開催地:神戸  

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  • フォトブリーチング分子タグ法による気泡乱流の計測

    細川 茂雄, 福永 貴之, 小林 敦希, 冨山 明男

    日本混相流学会年会講演会2007  2007年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道  

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  • ノズル内キャビテーションと噴流微粒化に及ぼすノズル形状と寸法の影響

    宋 明良, Muhammad Ilham Maulana, 礒崎 健二, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2007  2007年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • 気水分離器内旋回気液二相流に関する研究

    片岡 宏庸, 西脇 大祐, 冨山 明男, 細川 茂雄, 茶木 雅夫

    日本混相流学会年会講演会2007  2007年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • 加圧水型原子炉ホットレグ内気液対向流に関する研究

    西脇 大祐, 片岡 宏庸, 冨山 明男, 細川 茂雄, 佐々木 泰裕, 南 則敏

    日本混相流学会年会講演会2007  2007年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • 鉛直円管内単一二酸化炭素気泡の溶解過程

    大川 英晃, 阿部 覚, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2007  2007年6月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:札幌  

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  • 気泡を含む流れの光学計測

    細川 茂雄

    第33回混相流レクチャーシリーズ「気液混相流の計測技術〜基礎と実用〜」  2007年4月  日本混相流学会

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    記述言語:日本語  

    開催地:東京  

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  • PWRホットレグ部における気液対向流に関する研究

    西脇 大祐, 片岡 宏庸, 冨山 明男, 細川 茂雄, 佐々木 泰裕, 南 則敏

    日本原子力学会 2007年春の年会  2007年3月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋  

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  • 超高出力密度炉心ABWRプラントの実用化に向けた技術開発 (II)気水分離器内流動特性評価試験

    片岡 宏庸, 西脇 大祐, 冨山 明男, 細川 茂雄, 宋 明良, 茶木 雅夫

    日本原子力学会 2007年春の年会  2007年3月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:名古屋  

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  • 鉛直管内気泡乱流の数値予測

    橋本 将平, 細川 茂雄, 冨山 明男, 宋 明良

    日本機械学会関西支部第82期定時総会講演会  2007年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • フォトブリーチング分子タグ法によるダクト内乱流の計測

    小林 敦希, 細川 茂雄, 冨山 明男

    日本機械学会関西支部第82期定時総会講演会  2007年3月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪  

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  • 流速計測の基礎と応用

    細川 茂雄

    日本機械学会関西支部第287回講習会  2006年12月  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:大阪  

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  • ノズル内キャビテーションによる液体噴流の微粒化機構 招待

    宋 明良, 細川 茂雄, 冨山 明男

    オーガナイズド混相流フォーラム(OMF2006)  2006年10月 

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    記述言語:日本語   会議種別:口頭発表(招待・特別)  

    開催地:宮城  

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  • 超高出力密度炉心ABWRプラントの実用化に向けた技術開発(7) 気水分離器内流動特性評価試験

    片岡 宏庸, 西脇 大祐, 冨山 明男, 細川 茂雄, 宋 明良, 茶木 雅夫

    日本原子力学会秋の大会2006  2006年10月  日本原子力学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:北海道  

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  • 二次元ノズル内キャビテーションの液体噴流微粒化に及ぼす影響

    前田 達利, Maulana Muhammad Ilham, 宋 明良, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2006  2006年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 超高出力密度炉心ABWRプラントの実用化に向けた技術開発(4)- 縮小モデル試験による気水分離器内流動特性評価 -

    片岡 宏庸, 細川 茂雄, 冨山 明男, 茶木 雅夫, 村瀬 道雄

    日本混相流学会年会講演会2006  2006年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 鉛直管内二酸化炭素-水系気液二相流における気泡溶解過程

    野澤 聡, 阿部 覚, 細川 茂雄, 宋 明良, 冨山 明男

    日本混相流学会年会講演会2006  2006年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 鉛直ダクト内高速流中の気泡運動に及ぼす障害物の影響

    張 政, 牧野 泰, 片岡 宏庸, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2006  2006年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 一様せん断流中単一液滴に作用する揚力に関する研究

    小川 耕平, Win Myint, 林 公祐, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2006  2006年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 2次元ノズル内で生成される微細気泡の計測

    小枝 亮一, 細川 茂雄, 冨山 明男, 六嶋 一雅, 山口 重行, 前田 康成

    日本混相流学会年会講演会2006  2006年8月  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 密度分布を有する流れ場の数値計算手法検証

    宋 明良, 前田 章善, 細川 茂雄, 冨山 明男

    第34回可視化情報シンポジウム  2006年7月  可視化情報学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • スワール噴射弁により形成される非定常噴霧に及ぼす雰囲気ガス密度の影響

    細川 茂雄, 宋 明良, Muhammad Ilham Maulana, 冨山 明男

    第34回可視化情報シンポジウム  2006年7月  可視化情報学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • スワールインジェクタの噴霧特性に及ぼす雰囲気密度の影響

    野村 亮介, 宋 明良, 細川 茂雄, 冨山 明男

    日本機械学会流体工学部門講演会  2005年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • マイクロバブルの気泡径・速度同時計測

    赤川 純一, 細川 茂雄, 冨山 明男, 六嶋 一雅, 山口 重行, 前田 康成

    日本機械学会流体工学部門講演会2005  2005年10月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:金沢  

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  • 広範囲の燃料格子仕様に適用する汎用沸騰遷移解析手法に関する技術開発(2)-サブチャンネル内流動様式の測定-

    坪 泰司, 水谷 義隆, 細川 茂雄, 冨山 明男, 三島 嘉一郎, 工藤 義朗

    日本原子力学会2005年秋の大会  2005年9月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:青森  

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  • 静止液中における単一液滴の終端速度

    WIN Myint, 冨山 明男, 細川 茂雄

    日本流体力学会年会2005  2005年9月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 2次元ノズル内キャビテーション乱流と液体微粒化に及ぼす影響

    宋 明良, 濁川 慎司, 前田 達利, 冨山 明男, 細川 茂雄

    日本混相流学会年会講演会2005  2005年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • フォトブリーチンク分子タグ法による速度・速度勾配の同時計測

    赤川 純一, 小林 敦希, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2005  2005年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • 障害物を含む鉛直ダクト内高速流中小気泡の運動

    張 政, 片岡 宏庸, 牧野 泰, 冨山 明男, 細川 茂雄

    日本機械学会第18回計算力学講演会  2005年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:茨城  

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  • 気泡-液相間相対速度に及ぼす液相乱れの影響

    細川 茂雄, 橋本 将平, 冨山 明男

    日本混相流学会年会講演会2005  2005年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • ロッドバンドル内気液二相流の流動様式に関する研究

    水谷 義隆, 坪 泰司, 三島 嘉一郎, 工藤 義郎, 宋 明良, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会2005  2005年8月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • フォトブリーチンク分子タグ法による速度・速度勾配の同時計測

    細川 茂雄, 赤川 純一, 冨山 明男

    第33回可視化情報シンポジウム  2005年7月 

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • ノズル内キャビテーション流れの可視化とLDV計測

    宋 明良, 濁川 慎司, 冨山 明男, 細川 茂雄, 松本 洋一郎

    第13回微粒化シンポジウム  2004年12月  日本液体微粒化学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京  

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  • Terminal Velocities of Single Drops rising through Stagnant Liquids 国際会議

    Win Myint, MATSUMOTO Daisuke, SOU Akira, HOSOKAWA Shigeo, TOMIYAMA Akio

    日本混相流学会年会講演会  2004年  日本混相流学会

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:岡山大学  

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  • 2波長の光強度勾配を用いた3次元粒子画像流速計の開発

    細川 茂雄, 今井 健二郎, 冨山 明男

    第32回可視化情報シンポジウム  2004年  可視化情報学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:工学院大学  

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  • 二酸化炭素-水系鉛直管内気泡流に関する研究

    嶋 敏秀, 白井 正貴, 冨山 明男, 細川 茂雄, 宋 明良

    日本混相流学会年会講演会  2004年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:岡山大学  

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  • 気泡乱流

    細川 茂雄

    日本機械学会関西支部第5回秋季技術交流フォーラム  2004年  日本機械学会関西支部

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:未記入  

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  • 鉛直円管内気液二相気泡乱流における気泡運動に関する研究

    藤墳 哲平, 細川 茂雄, 冨山 明男

    日本混相流学会年会講演会  2004年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:岡山大学  

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  • インジェクタのノズル内キャビテーションと液体噴流の可視化

    濁川 慎司, 宋 明良, 冨山 明男, 細川 茂雄, 松本 洋一郎

    日本混相流学会年会講演会  2004年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:岡山大学  

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  • Photobleaching反応を用いた気泡周りの流れの計測

    青木 隆介, 細川 茂雄, 冨山 明男

    日本機械学会年次大会講演会  2003年  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:徳島大学  

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  • 粒子画像流速測定法を用いた気泡周りの圧力評価

    今井 健二郎, 細川 茂雄, 冨山 明男

    日本混相流学会年会  2003年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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  • 非均質気泡プルームに関する研究

    吉田 悟, 島田 直樹, 冨山 明男, 細川 茂雄

    日本混相流学会年会講演会  2003年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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  • 鉛直流路内気泡の上昇速度に関する研究

    三橋 真人, 冨山 明男, 細川 茂男, 宋 明良

    日本混相流学会年会講演会  2003年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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  • 鉛直管内未発達気泡流に関する研究

    白井 正貴, 山本 修示, 冨山 明男, 細川 茂雄

    日本混相流学会年会講演会  2003年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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  • 鉛直円管内気泡流における壁面近傍の乱流特性

    細川 茂雄, 植田 浩生, 冨山 明男

    日本機械学会年次大会講演会  2003年  日本機械学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:徳島大学  

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  • 鉛直円管内気泡流における気泡誘起乱れに関する研究

    細川 茂雄, 植田 浩生, 藤墳 哲平, 冨山 明男

    日本混相流学会年会  2003年  日本混相流学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:大阪大学  

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産業財産権

  • 微小気泡発生装置および気泡径制御方法

    細川 茂雄

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    出願人:大学長

    出願番号:特願2013-219630  出願日:2013年10月

    特許番号/登録番号:特許6368080  発行日:2018年7月

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受賞

  • 日本混相流学会「論文賞」

    2017年8月   日本混相流学会   鉛直管における気液対向流制限

    楠木 貴世志, 山本 泰功, 村瀬 道雄, 林 公祐, 細川 茂雄, 冨山 明男

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    受賞国:日本国

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  • 日本機械学会流体工学部門 第94期一般表彰(フロンティア表彰)

    2016年11月   日本機械学会   気泡流をはじめとする気液二相流の分野における優れた成果,特に,分子タグ法による乱れエネルギ収支の研究をはじめとるす高精度の先端計測手法に関する先駆的に取り組み,およびその発展への貢献

    細川 茂雄

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

    気泡流をはじめとする気液二相流の分野で優れた成果を数多く挙げ,特に,分子タグ法による乱れエネルギ収支の研究をはじめ,高精度の先端計測手法に先駆的に取り組み,その発展に大きく貢献した.

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  • Best Paper Award

    2014年12月   15th International Topical Meeting on Nuclear Reactor Thermalhydraulics (NURETH-15)   Concendation Experiments for Counter-Current Flow Limitation at Lower End of an Invertied U-Tube

    KINOSHITA TAKAYOSHI, MURASE MICHIO, FUJII YUKI, NOZUE TAKAHIRO, HOSOKAWA SHIGEO, TOMIYAMA AKIO

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    受賞区分:国際学会・会議・シンポジウム等の賞  受賞国:日本国

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  • Best Poster Award

    2013年5月   15th International Topical Meeting on Nuclear Reactor Thermalhydraulics (NURETH-15)   Void Distribution and Bubble Motion in Bubbly Flows in a 4 X 4 Rod Bundle

    HOSOKAWA SHIGEO, HAYASHI KOSUKE, TOMIYAMA AKIO

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    受賞区分:国際学会・会議・シンポジウム等の賞  受賞国:イタリア共和国

    The “best” poster based on the structure of the presentation (visual quality)

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  • 2012年度 日本機械学会賞(論文)

    2013年4月   日本機械学会   フォトブリーチング分子タグ法による乱れエネルギ収支の評価

    水本 博貴, 細川 茂雄, 冨山 明男

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

    日本機械学会論文集, 77巻, 784号, B編(2011年12月)

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  • 2011年度 日本混相流学会賞 技術賞

    2012年8月   日本混相流学会   混相流に適用できる空間フィルタ流速計の開発

    細川 茂雄, 冨山 明男

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  • 日本機械学会関西支部 関西支部賞(研究賞)

    2012年3月   日本機械学会関西支部   加圧溶解式マイクロバブル発生法における気泡発生メカニズムの解明

    前田 康成, 山口 重行, 伊藤 良泰, 柴田 尚紀, 細川 茂雄

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  • 日本機械学会 第89期(2011年度)流体工学部門 一般表彰(貢献表彰)

    2011年9月   日本機械学会   日本機械学会流体工学部門の広報活動に関する貢献

    細川 茂雄

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  • 2004年度日本混相流学会賞 論文賞

    2005年8月   日本混相流学会   鉛直円管内低濃度固気二相流の乱流変調に及ぼす相間相対速度の影響

    細川 茂雄, 冨山 明男

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  • 第36回日本原子力学会賞 論文賞

    2004年3月   日本原子力学会   Shape and Rising Velocities of Single Bubble risingnthrough an Inner Subchannel

    冨山 明男, 細川 茂雄

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  • '98年度日本混相流学会賞 奨励賞

    1999年7月   日本混相流学会   混相乱流場の計測

    細川 茂雄

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共同研究・競争的資金等の研究課題

  • 変形・変動を伴う流動界面への界面活性剤吸脱着現象の探求とモデル化

    研究課題/領域番号:19H02067  2019年4月 - 2022年3月

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    細川 茂雄, 冨山 明男, 林 公祐

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    配分額:17420000円 ( 直接経費:13400000円 、 間接経費:4020000円 )

    多くの工業分野、自然界において気泡や液滴を含む流れが見られ、界面活性剤などの汚染物質の界面への吸着により気泡/液滴と周囲流体間の運動量/熱/物質移動が清浄系と異なることが知られている。静止した界面への界面活性剤の吸着脱離特性に比べ、流動を伴う界面への吸着脱離に関する知見は少なく、数値予測精度向上などを阻んでいる。本研究では、高精度速度分布計測に基づく界面上界面活性剤濃度評価手法を発展させ、液滴表面に作用する局所粘性応力、圧力を評価し、界面活性剤の吸着と流体力の関係を明らかにした。また、当該手法を一般座標系測定領域に拡張することにより、変形液滴界面の流体力学的特性と界面活性剤吸着状態を評価した。

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  • 物理吸収・化学吸収を伴う高気相流量・高粒子濃度スラリー気泡塔の数値予測技術の開発

    2018年4月 - 2022年3月

    科学研究費補助金/基盤研究(A) 

    冨山 明男

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    資金種別:競争的資金

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  • 界面活性剤の界面安定化効果を用いた高流量用マイクロ流路内テイラー流生成器の開発

    2017年4月 - 2020年3月

    学術研究助成基金助成金/基盤研究(C) 

    林 公祐

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    資金種別:競争的資金

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  • 流れを伴う界面への界面活性剤の吸脱着現象の実験的解明とモデル化

    2016年4月 - 2019年3月

    学術研究助成基金助成金/基盤研究(C) 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • 高気相体積率スラリー気泡塔のスケールアップ支援用流動予測技術の開発

    2015年4月 - 2018年3月

    科学研究費補助金/基盤研究(B) 

    冨山 明男

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    資金種別:競争的資金

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  • A-STEP「相変化を用いた高効率エアリフトポンプの実証試験」

    2015年

    科学技術振興機構  研究成果最適展開支援プログラム フィージビリティスタディステージ 探索タイプ 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • A-STEP「相変化を用いた高効率エアリフトポンプの実証試験」

    2014年

    研究成果最適展開支援プログラム フィージビリティスタディステージ 探索タイプ 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • 空間フィルタ流速計の高度化と気泡乱流の3次元・マルチスケール分析

    2013年4月 - 2016年3月

    科学研究費一部基金/基盤研究(B)特設 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • A-STEP「時系列デジタル画像に基づく空間フィルタ流速計の開発と実用性向上」

    2013年

    研究成果最適展開支援プログラム フィージビリティスタディステージ 探索タイプ 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • 高気相体積率・高粒子濃度の汚染系スラリー気泡塔内流れの把握と数値予測技術の開発

    2012年4月 - 2015年3月

    科学研究費補助金/基盤研究(B) 

    冨山 明男

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    資金種別:競争的資金

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  • A-STEP「時系列デジタル画像に基づく空間フィルタ流速計の開発と実用性向上」

    2012年

    研究成果最適展開支援プログラム フィージビリティスタディステージ 探索タイプ 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • フォトブリーチング分子タグ法による気泡流乱れエネルギ収支計測と乱流モデルの高度化

    2010年

    科学研究費補助金/基盤研究(C) 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • 化学反応を伴う高濃度スラリー系多分散固気液三相気泡流のモデル化と計算技術の開発

    2009年

    科学研究費補助金/基盤研究(B) 

    冨山 明男

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    資金種別:競争的資金

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  • キャビテーション誘起乱れを伴う液体噴流の微粒化過程

    2008年

    科学研究費補助金/基盤研究(C) 

    宋 明良

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    資金種別:競争的資金

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  • 光弾性CTによる流れ場内3次元応力計測技術の開発

    2007年

    科学研究費補助金/萌芽研究 

    細川 茂雄

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    担当区分:研究代表者  資金種別:競争的資金

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  • 汚染環境下非球形二酸化炭素気泡の物質輸送メカニズムの考察

    2006年

    科学研究費補助金/萌芽研究 

    冨山 明男

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    資金種別:競争的資金

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  • ロッドバンドル内スペーサ近傍気泡流動のマルチスケール実験・計算融合評価技術の開発

    2006年

    科学研究費補助金/基盤研究(A) 

    冨山 明男

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    資金種別:競争的資金

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  • 単孔ホールノズル内キャビテーションと微粒化促進機構の解明

    2006年

    科学研究費補助金/基盤研究(C) 

    宋 明良

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    資金種別:競争的資金

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  • 可変空間分解能型マルチスケール混相流統合解析技術の開発

    2005年

    科学研究費補助金/基盤研究(B) 

    冨山 明男

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    資金種別:競争的資金

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  • 3軸方向速度成分の3次元空間分布測定を可能にする粒子画像計測法の開発

    研究課題/領域番号:15760110  2003年 - 2004年

    日本学術振興会  科学研究費助成事業  若手研究(B)

    細川 茂雄

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    配分額:3700000円 ( 直接経費:3700000円 )

    粒子画像計測法(PIV, PTV)は、流速の瞬時空間分布を測定でき、流体の力学的評価に資する実験データを得られる計測手法として幅広く用いられるようになった。しかし、現在市販されている粒子画像計測法では、瞬時速度場の3軸方向成分を3次元空間内で得ることはできない。本研究では、3軸方向速度の3次元分布を測定できる粒子画像計測手法を構築し、その実用性を評価することを目的とする。
    前年度は、計測手法原理の構築、3次元粒子位置計測システム開発、3軸方向速度の3次元分布算出用相関アルゴリズム開発を実施した。今年度は、これらのシステムを統合し、3次元粒子画像流速計測システムを構築した。また、予備実験を実施し、光学系および相関アルゴリズムに改良を加えた。開発したシステムを層流噴流、液滴周囲流れ、ダクト内乱流に適用し、1)2波長の散乱光強度の比からレーザシート奥行き方向の位置評価が可能であり、その誤差は5%以下であること、2)速度ベクトル算出時の最大計測誤差は相関値と強い相関があり、相関値に基づく過誤ベクトルの除去が可能であること、3)本システムにおける速度の測定誤差は、レーザシート平面内成分に対して5%以下、垂直成分に対して10%以下であること、4)本システムは、界面および循環を伴う沈降液滴周囲の3次元流動を良好に計測できること、5)本システムによりダクト内乱流場の速度測定が可能であり、測定した速度および乱れの分布は、レーザドップラ流速計による計測値と良く一致することを確認した。

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  • 気液二相流における瞬時局所圧力・速度の非接触同時計測手法の開発

    研究課題/領域番号:13750143  2001年 - 2002年

    日本学術振興会  科学研究費助成事業  若手研究(B)

    細川 茂雄

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    配分額:2100000円 ( 直接経費:2100000円 )

    種々の工業プラントおよび工業製品内の流れ場の多くは、気泡を含む混相流となっている。機器の高効率化、高性能化のためには、気泡運動の解明とそのモデル化が必要である。PIV/PTV等による流れ場測定は、気泡周りのメゾ・ミクロ構造を解明するための手法として、最近クローズアップされているが、気泡運動を考える上で最も重要な気泡周囲の圧力分布に関するデータは得られない.圧力測定法としては、感圧塗料、圧電素子等が挙げられるが、殆どの手法は壁面での圧力測定しか出来ず、また流動によって生じる1mmAq以下の微小圧力変動は検知できない。本研究では、気泡のメゾ・ミクロ運動メカニズムを解明に資する気泡を含む流動場内の局所瞬時圧力・速度の多点同時計測手法の開発を目的とする。具体的には、PIVを基本とした速度計測システムを高度化し、高分解能・高精度で局所・瞬時の多点同時速度測定を可能にする。その後、多点同時計測された局所瞬時速度分布から流れの運動量保存式・質量保存式に基づき・局所瞬時圧力を算出する。本年度は、昨年度構築した圧力速度同時計測システムを気泡周り流れに適用し、その有用性と評価を行った。まず、円管内層流中に固定された球形固体周りの流れ場に本システムを適用し速度・圧力を測定するとともに、数値解析を実施し、両者を比較した。その結果、本手法が球形固体粒子周りの流れ場の速度・圧力を良好に測定できることを確認した。次に、本システムを鉛管内下降層流中でほぼ静止する気泡周りの流れおよび静止液中を上昇する気泡周りの流れ場へ適用し、本手法が妥当な速度・圧力場を与えることを確認した。また。詳細数値解析結果と測定した速度・圧力場が定性的に一致することを確認した。以上より、本手法が気泡周りの流れ場の速度・圧力計測手法として有益であることを確認した。今後、速度計測精度の向上および3次元速度場計測手法の構築により、本手法の有用性がさらに高くなる.

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  • 気液界面のミクロスケール輸送現象と境界条件に関する研究

    研究課題/領域番号:13875038  2001年 - 2002年

    日本学術振興会  科学研究費助成事業  萌芽研究

    冨山 明男, 細川 茂雄

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    配分額:2200000円 ( 直接経費:2200000円 )

    その工学・工業的重要性より、気液二相流に関する膨大な研究が行われているが、二相流の複雑性や多様性の根元である気液界面の特性に関しては未だ殆ど理解されていない。現在までの二相流研究は気液界面で両相の速度が等しいという仮説に立脚しているが、仮説の妥当性は保証されていない。一方、理論的に界面エントロピーの増加により界面において有限な相間速度差が生じることが示唆されているが、計測の困難さのため実験的な証明は無く、相間速度差のオーダーすら把握できていない。混相流研究のブレークスルーのためには、界面における物理、具体的には界面における両相の境界条件の研究が不可欠である。本研究では、気液二相流研究の根幹をなす界面上の速度の境界条件を実験的に解明する。さらに、その結果を基に詳細数値解析を実施し、微視的な界面の境界条件とメゾスケールの運動量輸送の関係を明らかにすることを目的とする。本年度は、前年度測定した平滑な気液界面近傍の両相速度分布について検討し、(1)界面において両相の速度差(界面スリップ)を生じる場合があること、(2)界面スリップは不可逆的界面運動量輸送が生じている条件で存在すること、(3)既存の界面エントロピー生成の評価式と実験結果が無矛盾であること、(4)界面スリップの大きさは代表速度の2%程度であることを示した。一方、既存の界面追跡法に基づく数値解析手法では気液界面がボケるため、以上の実験結果を反映することが困難である。そこで、界面評価精度を向上するため、計算格子内に界面評価用の格子を埋め込む新手法を考案した。また、単一気泡に対して本手法を適用し、本手法が計算格子程度の解像度で界面を捕らえることが可能であり、既存手法に比べ界面評価精度を大幅に改善できることを確認した。さらに、ロッドバンドル内を上昇する気泡を対象として、数値解析と実験を行い、本手法の有用性を確認した。

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  • フォトブリーチングを用いたMolecular Tagging流速計測法の開発

    研究課題/領域番号:11750142  1999年 - 2000年

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    細川 茂雄

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    配分額:2100000円 ( 直接経費:2100000円 )

    混相流の微細的現象解明のためには、流動状態を乱さない計測手法が不可欠である。単相流の非接触速度測定法の多くは、測定のために流れ場に散乱粒子を添加するが、二相流では散乱粒子が流動状態に与える影響を無視できない。そこで、本研究では、混相流の微細構造、時間変動特性などの微小スケールでの現象解明を可能とするために、フォトブリーチング反応を応用したMolecular Tagging流速測定法の確立を目的とする。
    まず、計測原理の確認を行うため、Ar-ionレーザを光源とした計測システムを構築した。本計測システムを用いて、蛍光色素(フルオロセインソデュウムソルト)を混入した静止水中で、レーザビーム強度、照射時間とフォトブリーチング反応率の関係を調べた。その結果、レーザビーム強度(光束密度)および照射時間の増加とともに反応率は増加することが確認できた。
    次に、液体の速度を多次元で測定するために、フォトブリーチング反応を起こした液塊を追跡する画像解析用ソフトウエアを開発した。本解析ソフトは、2時刻の画像から(1)重心位置の移動、(2)相互相関により速度を求められる。
    以上の計測システムを実際の流動場に適用し、その性能を評価した。その結果、以下の結果を得た。
    1)本手法を液単相流に適用し、液流の速度をPTVと同程度に精度良く測定できることを確認した。
    2)本手法を、界面を含む流れ場に適用し、良好な計測結果が得られた。従って、本手法により、従来の散乱粒子を用いる手法で問題となってきた界面への散乱粒子の堆積を回避し、より精度の高い計測が可能である。

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  • 光化学反応を用いた混相流におけるIn-situ多次元流速計測手法の開発

    研究課題/領域番号:09750192  1997年 - 1998年

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    細川 茂雄

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    配分額:2200000円 ( 直接経費:2200000円 )

    本研究では、混相流における微細構造や時間変動特性の把握をできる計測手法として、温度、速度、相定義関数の同時測定を可能とする高分解能非接触局所計測手法の開発を行った。また、静止水中を上昇する気泡、鉛直円管内気泡流、温度成層場を上昇する単一気泡に開発した計測手法を適用し、計測手法の性能を評価した。
    本手法は、液相中に蛍光物質を混入し、レーザドップラ流速計と同様の光学系を用いて速度場を測定する。この際、測定点に液相が存在する場合には、速度信号と同時に蛍光が観測できる。測定点に気泡又は固体粒子が存在する場合には、蛍光は観測できず、蛍光強度の時系列データからボイド率が測定できる。さらに、測定点に液相が存在する場合に得られる蛍光強度から液相の局所温度の測定が可能となる。本手法の開発手順を以下に示す。
    1) Ar-ionレーザを光源とした計測用光学系と蛍光信号処理回路および信号処理プログラムを設計、製作した。
    2) 温度、相定義関数の測定原理の確認と誤差を評価した。
    3) 温度、速度、相定義関数の同期を可能とし、システムとして完成した。
    また本手法を混相流に適用した場合の性能評価結果を以下に示す。
    1) 本計測手法は混相流に対して、相定義関数、ボイド率、温度と速度の局所非接触時系列同時測定が可能であり、分散性混相流で数密度が非常に高い場合を除いて非常に有効な手法である。
    2) 本手法の空間分解能は、100μm程度、時間分解能は0.1ms程度であり、気泡背後のWake構造等、高い分解能が要求される混相流のミクロ現象の解明に有効である。
    3) 本手法の精度は、速度、ボイド率に対して数%、温度に対して1度以下であり、高精度で測定が可能である。さらに、本計測手法を用いることにより、得られた知見を以下に示す。
    1) 静止液中を上昇する気泡により誘発された流れ場においては、相定義関数と平均速度、流速変動の間に強い相関関係がある。
    2) 気泡背後の双子渦の長さは気泡径の約2倍程度であり、幅は気泡径の2/3程度である。
    3) 温度成層中を上昇する気泡背後の低温度領域は、気泡背後の双子渦に比べて小さい。

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  • 全ての流動様式に適用できる一次元垂直管内非定常気液二相流モデルの構築

    研究課題/領域番号:08455093  1996年 - 1998年

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    坂口 忠司, 細川 茂雄, 冨山 明男

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    配分額:7700000円 ( 直接経費:7700000円 )

    本研究では、鉛直管内気液二相流を対象として、これまで実験データが不十分であった遷移領域を含めた全流動様式範囲で、統計平均量と統計変動量を測定し、流動様式間の遷移条件、遷移機構を明らかにするとともに、実験データに基づく数理モデルを用いて全ての流動様式を網羅した一次元非定常気液二相流の予測モデルを構築することを目的とする。
    鉛直管内の流動様式は、気泡流からスラグ流を経て環状流へと遷移するが、環状流領域では従来から用いられている三流体モデルが適用できることを確認した。次に、気泡流からスラグ流については流動様式の遷移条件自体が不明であるため、実験的に鉛直管内未発達気液二相流に関する基本的情報を収集と、気泡流からスラグ流への遷移現象を予測可能な計算手法の構築を行った。
    実験では、気泡流からスラグ流への遷移現象や気泡同士の合体など、モデリングに利用できる基本的情報の収集を行った。特に、気泡の集合化(気泡クラスター形成過程及びその構造)、気泡合体過程、気泡クラスターからTaylor気泡への成長過程、大気泡下部の伴流構造等に関する情報を実験的に収集した。また、気相体積率(ボイド率)及び圧力の空間発展と統計変動が測定可能な実験装置を作成することにより、統計平均値だけでなく変動量に関する実験データベースも蓄積すると共に、ボイド率と圧力の相関関係に関して考察した。
    以上の実験より得られた情報と従来の知見から、気泡流からスラグ流への遷移を模擬するためには、気泡の半径方向分布を無視できないことが判明した。そこで、本研究では、一次元の方程式系に気泡の半径方向分布をサブグリッドモデルとして導入した一次元気液二相流モデル(擬二次元気泡追跡法)を構築した。本手法は、半径方向の情報をサブグリッドモデルとして計算負荷の低減を図っているため、高速パーソナルコンピュータでほぼ実時間で解析を進められる。本手法で予測された流動様式発展は、静止液中、層流液流中、乱流液流中に対して実験結果とよく一致し、未発達気液二相流の実時間予測が可能であることを確認した。また、本解析手法が、時間平均ボイド率だけでなくボイド率の統計平均量も高い精度で計算できることを確認した。
    本研究で開発した擬2次元気泡追跡法と三流体モデルのセットが、全ての流動様式に適用できる垂直管内非定常気液二相流モデルとなる。

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  • レーザー誘起蛍光法を用いた気泡形状の定量的解析と気泡運動モデルの構築

    研究課題/領域番号:08650205  1996年 - 1998年

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    冨山 明男, 細川 茂雄, 坂口 忠司

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    配分額:2300000円 ( 直接経費:2300000円 )

    本研究の目的は、一様な速度勾配を持つ液流中における単一気泡の形状や運動特性に関する実験結果を基に、信頼できる気泡運動の予測モデルを構築することを目的としている。このため、安定した一様な速度勾配流れバを形成できる実験装置を作成し、その速度場をLDVを用いて計測し、様々な濃度のグリセリン水溶液で安定した液相速度場が形成されていることを確認した。次に、気泡形状、等価直径、気泡の2次元位置および速度を計測できる画像計測手法を構築した。本計測手法を速度勾配を持つ液流中を上昇する単一気泡に適用し、気泡径、液相速度勾配、物性値をパラメータとした広範囲にわたる実験データベースを構築した。さらに、実験で得られた気泡の軌跡から揚力係数を算出するプログラムの作成を行い、揚力係数に関する実験データベースを構築した。以上の実験データベースの基づき、揚力係数と気泡径、物性値等の関係を把握した後、揚力係数に関する次の数理モデルを構築した。
    1. 一様な速度勾配中の気泡の横方向力(F)は、F=-C_<LρL>π/6d^3V_R×γotV_L(C_L:揚力係数,ρ_L:液相密度,d:気泡径,V_R:相対速度,V_L:液相速度)で記述でき、揚力係数は流動状態により決まる定数となる。
    2. 揚力係数は、気泡レイノルズ数と修正エトベス数の関数として記述でき、以下の形をとる。
    また、揚力係数が気泡背後のWake構造と関係すると推察されたため、レーザー誘起蛍光法を用いた気泡周りの速度計測手法を構築し、静止液中および速度勾配を持つ液流中の単一気泡のWakeを定量的に測定し、Wakeの変化を調べた。この結果、Wakeの構造が気泡の等価直径よりも気泡の流れに垂直な方向の長さに関係が深いこと、および速度勾配を持つ液流中では気泡のWakeが左右非対称になることを確認した。

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  • 同軸噴射弁における気液界面の微細構造に関する研究

    研究課題/領域番号:07750195  1995年

    日本学術振興会  科学研究費助成事業  奨励研究(A)