Updated on 2024/03/30

写真a

 
OTOMO,Ryoko
 
Organization
Faculty of Engineering Science Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(工学) ( 2013.3 )

Research Interests

  • Mass transfer

  • Fluid engineering

  • Multiphase flow

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  • Nanotechnology/Materials / Applied condensed matter physics

Professional Memberships

  • THE MINING AND MATERIALS PROCESSING INSTITUTE OF JAPAN

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  • THE VISUALIZATION SOCIETY OF JAPAN

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  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

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  • JAPANESE SOCIETY OF BIORHEOLOGY

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  • THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

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Papers

  • Visualization of mixing upper and lower stratified suspensions using red and blue fluorescent particles

    Yohsuke Tanaka, Tatsuki IWAGUCHI, Yasufumi Yamamoto, Ryoko Otomo, Shusaku Harada

    Multiphase Science and Technology   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Begell House  

    DOI: 10.1615/multscientechn.2023048360

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  • Effect of terminal velocities on macroscopic and microscopic hydrodynamic mixing of stratified suspensions

    Yasufumi Yamamoto, Ryoko Otomo, Yohsuke Tanaka, Shusaku Harada

    Physical Review E   106 ( 4 )   2022.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physreve.106.045109

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevE.106.045109/fulltext

  • Pore Network and Fluid Permeability in Fibrous and Particle Beds with Large Porosity (Evaluation of Pore Structure and Hydraulic Radius based on Voronoi Tessellation) Reviewed

    OTOMO Ryoko, DEGUCHI Yuji, HARADA Shusaku

    36 ( 2 )   266 - 273   2022.6

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Energy generation characteristics of pressure retarded osmosis using polymer solution Reviewed

    Kiyoshi BANDO, Ryoko OTOMO, Yuma SUZUKI, Takamori SHIOMI, Yusuke NISHIZAKI

    Bulletin of JSME, Journal of Fluid Science and Technology   Vol. 17, No. 1   2022.4

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  • Hydrodynamic diffusive behavior of fine particle assemblage passing through nonuniform granular porous media Reviewed

    Ryoko Otomo, Yuki Nakano, Shusaku Harada

    Particulate Science and Technology   2022

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Numerical Analysis on Transport of Particle Assemblage in Fibrous Media (Hydrodynamic Diffusion of Particles of Different Size) Reviewed

    OTOMO Ryoko, ISHIDA Yu, MORISHITA Sohei, KIRA Ryosuke

    2021.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Effects of rigidity on tension within the cell membranes of erythrocytes swollen by osmotic shock Reviewed

    Kiyoshi BANDO, Ryoko OTOMO

    Journal of Biomechanical Science and Engineering   2021

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/jbse.21-00205

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  • The Effect of the Layered Internal Structure of Fibrous Beds on the Hydrodynamic Diffusive Behavior of Microparticles Reviewed

    R. Otomo, R. Kira

    Micromachines   2021

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Numerical analysis on motion of microparticles passing through straight and tortuous fibrous layers Reviewed

    R. Otomo, K. Mori

    Fluid Dynamics Research   53 ( 2 )   025503   2021

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

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  • Analysis of Fluid Permeability in Tortuous Fibrous Bed based on Pore Radius Distribution Reviewed

    R. Otomo, K. Mori

    Journal of Visualization   23 ( 1 )   71 - 80   2020.2

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s12650-019-00613-1

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    Other Link: http://link.springer.com/article/10.1007/s12650-019-00613-1/fulltext.html

  • Analysis of erythrocyte swelling caused by osmotic shock under a non-hemolytic condition Reviewed

    Kiyoshi BANDO, Ryoko OTOMO, Yukari SHIMIZU, Haruho TABUCHI

    Transactions of the Visualization Society of Japan   40 ( 12 )   23 - 30   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Visualization Society of Japan  

    DOI: 10.3154/tvsj.40.23

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  • Numerical Simulation of Dynamic Wetting of a Solid Sphere by GNBC-Front-Tracking and Immersed Boundary Methods Reviewed

    R. Otomo, Y. Kita, Y. Yamamoto, T. Ito, T. Wakimoto, K. Katoh

    Japanese Journal of Multiphase Flow   29 ( 5 )   443 - 450   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE JAPANESE SOCIETY FOR MULTIPHASE FLOW  

    Dynamic wetting of a solid sphere has been simulated numerically. We have developed the model for the description of the moving contact lines on curved solid surfaces by combining the GNBC-Front-tracking method and the immersed boundary method. The model was applied to the simulation of a quasi-static penetration of a water-repellent sphere into the water. As a result, the shape of the interface for different wettability is in good agreement with the previous experimental results. The residual bubble volume was evaluated under the different sphere size, static contact angle, and penetrating velocity conditions. The present results show a similar trend to the experimental and theoretical ones that the water-repellent sphere has a larger bubble since it incorporates more volume of air into the water, indicating the dynamic wetting of the sphere surface can be reproduced by the model.

    DOI: 10.3811/jjmf.29.443

    CiNii Books

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    Other Link: https://jlc.jst.go.jp/DN/JLC/20022372701?from=CiNii

  • Quantitative evaluation of mass transfer near edge of porous media by adsorption photometry Reviewed

    T. Tanikoshi, R. Otomo, S. Harada

    AIChE Journal   63 ( 2 )   823 - 833   2016

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    Language:English   Publishing type:Research paper (scientific journal)  

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  • Inertial migration of a spherical particle in laminar square channel flows from low to high Reynolds numbers Reviewed

    Naoto Nakagawa, Takuya Yabu, Ryoko Otomo, Atsushi Kase, Masato Makino, Tomoaki Itano, Masako Sugihara-Seki

    JOURNAL OF FLUID MECHANICS   779   776 - 793   2015.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CAMBRIDGE UNIV PRESS  

    The lateral migration properties of a rigid spherical particle suspended in a pressure-driven flow through channels with square cross-sections were investigated numerically, in the range of Reynolds numbers (Re) from 20 to 1000. 'The flow field around the particle was computed by the immersed boundary method to calculate the lateral forces exerted on the particle and its trajectories, starting from various initial positions. 'The numerical simulation showed that eight equilibrium positions of the particle are present at the centres of the channel faces and near the corners of the chatmel cross-section. 'Me equilibrium positions at the centres of the channel faces are always stable, whereas the equilibrium positions at the corners are unstable until Re exceeds a certain critical value, Re-e. At Re Re-e additional equilibrium positions appear on a heteroclinic orbit that joins the channel face and corner equilibrium positions, and the lateral forces along the heteroclinic orbit are very small. As Re increases, the channel face equilibrium positions are shifted towards the channel wall at first, and then shifted away from the channel wall. The channel corner equilibrium positions exhibit a monotonic shift towards the channel corner with increasing Re. Migration behaviours of the particle in the cross-section are also predicted for various Values of Re. rftlese numerical results account for the experimental observations of particle distributions in the cross-section of micro and millimetre scale channels, including the characteristic alignment and focusing of the particles, the absence of the corner equilibrium positions at low Re and the progressive shift of the equilibrium positions with Re.

    DOI: 10.1017/jfm.2015.456

    Web of Science

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  • Fluid permeability of fibrous layers with finite thickness Reviewed

    Ryoko Otomo, Masako Sugihara-Seki

    Journal of Biorheology   29 ( 1 )   11 - 14   2015

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Biorheology  

    The vascular endothelial surface glycocalyx layer consists of fibrous glycoproteins with a thickness of several hundred nanometers to a few microns. The present study focuses on the function of the glycocalyx layer as a modulator of permeability in water transport across the blood vessel wall. A particulate layer model is developed to analyze the fluid permeation through the glycocalyx layer, which has periodic fibrous structures and finite thickness. Theoretical and numerical computations of the permeation resistance across the layer are performed based on the Stokesian dynamics approach. The results show that the resistance near the ends of the layer is affected considerably by the anisotropy of adjacent particle configurations. We describe such an end effect on the permeability in relation to the layer thickness and particle spacing ratio. It is suggested that the variations in thickness or fiber spacing in the glycocalyx layer could significantly alter its fluid permeation properties.

    DOI: 10.17106/jbr.29.11

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  • Mass transfer caused by gravitational instability at reactive solid-liquid interfaces Reviewed

    Ryoko Otomo, Nobuhiko Ishii, Keita Takahashi, Shusaku Harada

    JOURNAL OF VISUALIZATION   17 ( 1 )   49 - 57   2014.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Mass transfer in porous media has been investigated experimentally. In this paper, we present a visualization technique and discuss the behavior of a substance which transfers under the influence of gravity and reacts with the surface of porous media. Mass transfer by the reaction with porous media was demonstrated by means of electrochemical deposition experiment on particulate beds with complex structures. A copper plate (anode) and a stainless steel particulate bed (cathode) were, respectively, placed at the upper and bottom side of a thin vertical cell which was filled with copper sulfate solution. After the application of electricity, cupric ion which is provided from the copper plate to the solution transfers under the influence of gravity and it is consumed by deposition at the particulate bed. The behavior of ions between the electrodes was visualized by utilizing the infrared absorption characteristics of cupric ion. We observed gravitational instability and convection flow due to concentration gradient of ions in opposite direction to that of gravity, which is formed by reaction at solid-liquid interfaces. While downward flow caused by Rayleigh-Taylor instability was observed in the case of flat interfaces, upward flow generated from complex-shaped interfaces was greatly dependent on their geometry. The interaction of these flows resulted in the convection throughout the cell. Consequently, it is found from the results that the gravitational instability significantly varies the transport characteristics and that the reactive interface geometry greatly affects the overall mass transfer.

    DOI: 10.1007/s12650-013-0183-0

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  • Fluid Permeability in Stratified Unconsolidated Particulate Bed Reviewed

    Ryoko Otomo, Shusaku Harada

    Transport in Porous Media   96 ( 3 )   439 - 456   2013

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    Language:English   Publishing type:Research paper (scientific journal)  

    Fluid permeability of polydisperse particulate bed with finite thickness has been examined. On the assumption of creeping flow, the permeability of monodisperse particles with arbitrary arrangement is calculated by means of Stokesian dynamics approach in which the interaction between individual particles and interstitial fluid is described by multipole expansion of the Oseen tensor. We have extended such calculation method to polydisperse particulate systems which have not so dense structures (up to particle volume fraction φ ~ 0.2). The particles are located infinitely in space and their interaction has been taken into account by Ewald summation technique. For the spatial distribution of polydisperse particles, we consider locally stratified particulate beds and define stratification degree as a parameter which apparently and mathematically represents the thickness of the mixing region of different-sized particles. The permeability profiles in the particulate beds with different stratification degree show the dependence of local permeability on the spatial and size distribution of particles. Consequently, the calculation results indicate that the permeability of non-uniform polydisperse particulate bed can be predicted by integrating the local permeation resistance which is determined by the local specific surface area. © 2012 Springer Science+Business Media Dordrecht.

    DOI: 10.1007/s11242-012-0098-6

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  • 局所的に非一様な粒子層中の透過流動 Reviewed

    大友 涼子

    粉体工学会誌   50 ( 12 )   857 - 865   2013

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    Language:Japanese  

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  • End Effect on Permeability of Loose Particulate Bed Having Different Internal Structures Reviewed

    R. Otomo, S. Harada

    PARTICULATE SCIENCE AND TECHNOLOGY   29 ( 1 )   2 - 13   2011

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS INC  

    Permeability through media having various structures has been studied theoretically. We consider loose porous media, like fibrous materials, and media with a localized pore network, like fractured rocks. We model complicated porous structures by using assemblage of spherical particles. The calculations of permeability are performed by the Stokesian dynamic approach, which enables us to derive fluid motion in the presence of many particles. The Ewald summation technique is employed to represent infinite and finite particulate beds. In the infinite bed where the particles exist endlessly in space, we investigate how the internal structure of the media affects permeability. The results indicate that permeability significantly depends on internal structure, particularly the void geometry. In the finite bed where the particles form a bed with finite thickness, we discuss permeability variance due to the presence of ends. It is found that permeability greatly varies in the vicinity of ends owing to the anisotropy of the flow field, which arises from the presence of ends.

    DOI: 10.1080/02726351.2010.488715

    Web of Science

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  • Diffusive behavior of a thin particle layer in fluid by hydrodynamic interaction Reviewed

    Shusaku Harada, Ryoko Otomo

    PHYSICAL REVIEW E   80 ( 6 )   066311   2009.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    The hydrodynamic effect on a thin particle layer, which moves relative to fluid by an external force, is investigated theoretically and numerically. Because of the presence of layer ends, the arrangement of particles in the layer is anisotropic and the drag force acting on them varies according to the position. The resulting relative motion of particles brings about the spreading of the layer. We have studied such a diffusive behavior of particle layers, which have various internal arrangements. We have assumed a non-Brownian system in which the particles move relatively owing to only the variance of hydrodynamic force. The hydrodynamic force on each particle was calculated by Stokesian dynamics approach. The results show that the relative motion of particles is greatly influenced by the internal arrangement of the particle layer. In consequence, the overall diffusive motion of particle layer varies with the arrangement even if the particle concentration is similar. It is in contrast to the gradient diffusion of Brownian particles.

    DOI: 10.1103/PhysRevE.80.066311

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Books

  • 局所的に非一様な粒子層中の透過流動 Reviewed

    大友 涼子( Role: Sole author)

    粉体工学会誌  2013 

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MISC

  • 1D31 Measurement of apparent Young's modulus of human erythrocytes by the uniaxial tensile test : Effect of hardened eryth rocytes membrane

    NAGAI Yuta, KATO Yosuke, KOHRI Shimpei, TAJIKAWA Tsutomu, BANDO Kiyoshi, YAMAMOTO Yasufumi, OTOMO Ryoko

    2015 ( 27 )   157 - 158   2015.1

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    CiNii Books

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  • 28aAJ-4 Cross-sectional distribution of spherical particles in blood flow through a microchannel

    Nouso Ryota, Kimura Tomoya, Tanaka Shinnosuke, Seki Junji, Otomo Ryoko, Itano Tomoaki, Sugihara-Seki Masako

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   315 - 315   2014.3

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

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  • Report on the International Conference on Multiphase Flow 2013

    OTOMO Ryoko

    27 ( 3 )   340 - 342   2013.9

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    Language:Japanese  

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Research Projects

  • 浸透圧差による赤血球の膨張・溶血現象における個体差の定量評価とカプセル化への応用

    Grant number:22K03934  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    大友 涼子

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • Dynamics of monodispersed bubble generation skirting hydrodynamically crowded circumstance

    Grant number:21H01248  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s) 

    Grant amount:\17810000 ( Direct Cost: \13700000 、 Indirect Cost:\4110000 )

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  • Influence of Pore Connectivity on Upscaling Effects of Porous Media Flow

    Grant number:19H02252  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Shigematsu Takaaki

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    Authorship:Coinvestigator(s) 

    Grant amount:\17420000 ( Direct Cost: \13400000 、 Indirect Cost:\4020000 )

    It is found through a series of experiments for low-porosity porous media that the aspect ratio of the constituents of the porous media has a significant influence on the permeability test results and that the pore shape and its connectivity affect the hydraulic phenomena, which have been difficult to evaluate so far. In order to evaluate such phenomena more quantitatively, the boundary condition module of the Immersed Boundary Method was newly incorporated and validated by comparing the results with those of hydraulic experiments. In the case of high-porosity porous media, experiments on the migration characteristics of particulate suspensions using microfluidic channels revealed that the spreading of particulates is enhanced or inhibited by the coarse and dense structure of the pores, and that hydrodynamic diffusion can be expressed in a probabilistic manner.

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  • ラグランジュ型シミュレーションによる細胞の透過・吸着ダイナミクスの解明

    2017.4 - 2020.3

    日本学術振興会  科学研究費補助金 若手研究(B) 

    大友 涼子

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    Authorship:Principal investigator  Grant type:Competitive

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  • 管内流れ中で変形する物体周りにおける微小粒子のダイナミクス

    2014.4 - 2017.3

    日本学術振興会  科学研究費補助金 若手研究(B) 

    大友 涼子

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    Authorship:Principal investigator  Grant type:Competitive

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  • Fluid mechanical study on the platelet aggregation

    Grant number:23360087  2011.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    SUGIHARA-SEKI Masako, ITANO Tomoaki, YAMAMOTO Junichiro, KAJISIMA Takeo, MAKINO Masato, OTOMO Ryoko, AKINAGA Takeshi, O-TANI Hideyuki, MIURA Kazuma, NAKAGAWA Naoto

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    Grant amount:\18850000 ( Direct Cost: \14500000 、 Indirect Cost:\4350000 )

    The present study was aimed to investigate the fluid mechanical effect on the platelet aggregation experimentally and numerically. In the experiment, the observation of fluorescence stained platelets in red cell suspension by a confocal Laser scanning microscope showed that platelets move randomly and their concentration is enhanced near the vessel wall in the presence of red cells. The numerical simulation for binary dispersed suspensions revealed that the suspended particles tend to flow near the channel centerline or near the channel wall, depending on the particle size and physical properties. It was also found that the growth rate of aggregation depends on the surrounding flow and the rotation of the aggregate. Thus, the present study suggests that the fluid mechanical interaction with red cells plays a significant role in the formation and growth of platelet aggregation in blood flow.

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  • 界面形状の選択的成長に伴う多孔質体の移動特性変化

    2011.4 - 2013.3

    日本学術振興会  特別研究員DC2 

    大友 涼子

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    Authorship:Principal investigator  Grant type:Competitive

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Teaching Experience

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