川口　美沙 　博士論文：Microscopic evaluation and estimation of effective viscosity of pressure-driven suspension flow
研究概要

　In this thesis, microscopic evaluation and estimation of effective viscosity were developed and examined focusing on the relationship between macroscopic rheological properties of suspension flow in a channel and microstructure, which means spatial particle arrangements. Understanding of suspension rheology is an important issue that is relevant to many fields and applications. It has been suggested that the macroscopic effective viscosity of suspensions is related to its microstructure, and it is expected that the rheological properties can be controlled by manipulation of the particle distribution. However, rheological studies on the effective viscosity of suspensions and studies on the inertial migration of suspended particles in a channel have developed almost independently, and the effect of localization of the particle distribution on the effective viscosity is still unclear and it is difficult to estimate the effective viscosity by viscosity equations. Furthermore, in order to reveal effective microstructures for suspension transport, the problem is that the parameters for suspension rheology and inertial migration are not independent. This study aims to develop microscopic evaluation and estimation of effective viscosity for rheology control of pressure-driven suspension flow and to provide insights for rheological control by inertial manipulation of particles. The contribution of this study is to extend a method to evaluate and estimate the effective viscosity in the channel flow, where it is difficult to evaluate the effective viscosity by theoretical equation, and to show insight to control the effective viscosity (including the local effective viscosity) of suspensions by manipulating suspended particles by inertia.

　本研究では，懸濁液の流動特性の制御を目指し，懸濁液のレオロジー（実効粘度，非ニュートン性）と微細構造（懸濁粒子の空間分布）の関連に着目し，微小流路内流れにおける実効粘度の微視的な評価および局所分布を含む粘度推定方法を構築し，数値的・実験的に検討を行った．懸濁液レオロジーの理解は，幅広い分野に関連する重要な課題である．巨視的な懸濁液の実効粘度は，懸濁粒子が形成する微細構造に関連することが示唆されており，粒子分散状態の制御により流動特性を操作できることが期待される．しかし，実効粘度に関する懸濁液のレオロジーと，流路内を流れる懸濁粒子の慣性移動に関する研究はこれまでほとんど独立に発展してきており，粒子分散状態が不均一に変化することによる流動特性への影響は未だ明らかではなく，そのような実効粘度を粘度式から推定することは困難である．さらに，懸濁液輸送に効果的な微細構造を実現するには，粒子の慣性移動に関わるパラメータと懸濁液の流動特性に影響を及ぼすパラメータが，それぞれに対し独立していないことが問題となる．本研究の目的は圧力駆動される懸濁液流れのレオロジーコントロールのための微視的な粘度評価方法および推定方法の確立と，慣性移動を利用したレオロジーコントロールのための知見を提供することにある．本研究の貢献は，粘度式で評価できない「流れ」における壁面上の局所的な粘度分布を含む実効粘度を評価し，また，それを推定する方法を提案・拡張および検討し，慣性による懸濁粒子操作により，懸濁液の実効粘度制御に役立つことが期待される知見を示したことである．
研究業績等

　【卒業論文】

　“微小循環系における血液流れに関する数値解析”，京都工芸繊維大学，2016年2月．

 

　【修士論文】

　“楕円粒子分散系懸濁液において粒子の挙動がレオロジーに与える影響に関する数値解析”，京都工芸繊維大学，2019年2月．

 

　【博士論文】

　“Microscopic evaluation and estimation of effective viscosity of pressure-driven suspension flow”，京都工芸繊維大学，2022年1月．

 

　【学術論文】

  1. Hijiri Adachi, Tomohiro Fukui, and Misa Kawaguchi, "Comparative study of boundary treatment schemes in lattice Boltzmann method", Journal of Fluid Science and Technology, vol. 19, no. 3, 0025, pp. 1-20, 2024.
  2. Tomohiro Fukui and Misa Kawaguchi, "Numerical Study of Microscopic Particle Arrangement of Suspension Flow in a Narrow Channel for the Estimation of Macroscopic Rheological Properties", Advanced Powder Technology, vol. 33, 103855, pp. 1-10, 2022.
  3. Misa Kawaguchi, Tomohiro Fukui, and Koji Morinishi, "Comparative Study of the Virtual Flux Method and Immersed Boundary Method Coupled with Regularized Lattice Boltzmann Method for Suspension Flow Simulations", Computers & Fluids, vol. 246, 105615, pp. 1-17, 2022.
  4. Naoki Okamura, Tomohiro Fukui, Misa Kawaguchi, and Koji Morinishi, "Influence of Each Cylinder's Contribution on the Total Effective Viscosity of a Two-dimensional Suspension by a Two-way Coupling Scheme", Journal of Fluid Science and Technology, vol. 16, no. 3, 0020, pp. 1-13, 2021.
  5. Miho Tanaka, Tomohiro Fukui, Misa Kawaguchi, and Koji Morinishi, "Numerical Simulation on the Effects of Power-law Fluidic Properties on the Suspension Rheology", Journal of Fluid Science and Technology, vol. 16, no. 3, 0022, pp. 1-14, 2021.
  6. Misa Kawaguchi, Tomohiro Fukui, and Koji Morinishi, "Contribution of Particle-wall Distance and Rotational Motion of a Single Confined Elliptical Particle to the Effective Viscosity in Pressure-driven Plane Poiseuille Flows", Applied Sciences, vol. 11, no. 15, 6727, pp. 1-18, 2021.
  7. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Miho Tanaka, Mitsuru Tanaka, Shigeru Murata, Suguru Miyauchi, and Toshiyuki Hayase, "Viscosity Estimation of a Suspension with Rigid Spheres in Circular Microchannels using Particle Tracking Velocimetry", Micromachines, vol. 10, no. 10, 675, pp. 1-13, 2019.
  8. Tomohiro Fukui, Misa Kawaguchi, and Koji Morinishi, "Numerical Study on the Inertial Effects of Particles on the Rheology of a Suspension", Advances in Mechanical Engineering, vol. 11, no. 4, pp. 1-10, 2019.
  9. Tomohiro Fukui, Misa Kawaguchi, and Koji Morinishi, "A Two-way Coupling Scheme to Model the Effects of Particle Rotation on the Rheological Properties of a Semidilute Suspension", Computers & Fluids, vol. 173, pp. 6-16, 2018.

 

　【国際会議発表】

  1. Misa Kawaguchi, Tomohiro Fukui, and Kenichi Funamoto, "Numerical Viscosity Estimation Considering Inertial Migration in Plane Poiseuille Suspension Flow", 19th International Conference on Flow Dynamics (ICFD 2022), Sendai, Japan, 9 - 11 November, 2022, Conference proceedings, pp. 148-149.
  2. Misa Kawaguchi, Tomohiro Fukui, Mako Uchio, Kanako Kuroyanagi, Yurie Seto, Yoshiko Kaneko, and Koichi Takayama, "Computational Airflow Simulation to Assess Airway Resistance by Considering Bifurcation Geometry", 33rd International Conference on Parallel Computational Fluid Dynamics (Parallel CFD 2022), Alba, Italy, 25 - 27 May, 2022, Conference proceedings, 44, pp. 1-4.
  3. Misa Kawaguchi, Tomohiro Fukui, and Kenichi Funamoto, "Numerical Study on the Inertial Migration and Effective Viscosity in Pressure-driven Suspension Flows including Elliptical Particles", 18th International Conference on Flow Dynamics (ICFD 2021), Sendai, Japan, 27 - 29 October, 2021.
  4. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Miho Tanaka, Mitsuru Tanaka, Shigeru Murata, Suguru Miyauchi, and Toshiyuki Hayase, "Experimental Study on the Radial Particle Distributions of Neutrally Buoyant Spheres in a Dilute Suspension Flow through a Circular Microchannel", 17th International Conference on Flow Dynamics (ICFD 2020), Sendai, Japan, 28 - 30 October, 2020, Conference proceedings, pp. 167-168.
  5. Misa Kawaguchi, Tomohiro Fukui, Kanako Kuroyanagi, Shigeru Murata, and Yoshiko Kaneko, "Numerical Study on the Inspiratory Airflow in a Pulmonary Airway using Geometrical Segment Models", 31st International Symposium on Transport Phenomena, Hawaii Convention Center, USA, 13 - 16 October, 2020, Conference proceedings,151, pp. 1-8.
  6. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Mitsuru Tanaka, Shigeru Murata, Suguru Miyauchi, and Toshiyuki Hayase, "Measurement of particle concentration profiles of a dilute suspension in different Reynolds number conditions", 16th International Conference on Flow Dynamics (ICFD 2019), Sendai, Japan, 6 - 8 November, 2019, Conference proceedings, pp. 164-165.
  7. Misa Kawaguchi, Tomohiro Fukui, Mitsuru Tanaka, Shigeru Murata, and Koji Morinishi, "Numerical study on the rheological properties of a dilute suspension related to arrangements of elliptical suspended particles", 23rd International Conference on Computer Methods in Mechanics, Krakow, Poland, 8 - 12 September, 2019.
  8. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Suguru Miyauchi, and Toshiyuki Hayase, "Experimental Study on the Effects of Radial Dispersion of Spherical Particles on the Suspension Rheology", ASME-JSME-KSME Joint Fluids Engineering Conference 2019, San Francisco, USA, 28 July - 1 August, 2019, Conference proceedings, 5322, pp. 1-6.
  9. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, Suguru Miyauchi, and Toshiyuki Hayase, "Numerical and Experimental Studies on Non-Newtonian Rheology of a Suspension", 15th International Conference on Flow Dynamics (ICFD 2018), Sendai, Japan, 7 - 9 November, 2018, Conference proceedings, pp. 134-135.
  10. Misa Kawaguchi, Tomohiro Fukui, and Koji Morinishi, "Numerical Simulation on the Effect of Branches on the Wall Shear Stress Distribution of the Aortic Arch", The 11th Pacific Symposium on Flow Visualization and Image Processing, Kumamoto, Japan, 1 - 3 December, 2017, A conference proceedings is stored in USB memory.
  11. Misa Kawaguchi, Tomohiro Fukui, Kenichi Funamoto, and Toshiyuki Hayase, "Estimation of Viscosity Profiles of Semidilute Suspensions by Computational and Experimental Studies", 14th International Conference on Flow Dynamics (ICFD 2017), Sendai, Japan, 1 - 3 November, 2017, Conference proceedings, pp. 78-79.

 

　【国内会議発表】

  1. 川口美沙，福井智宏，金子美子，“HyperWorksを用いた肺気道内流れの分割計算手法の検討”，第25回 計算工学講演会，USB memory，北九州，2020年6月．
  2. 川口美沙，福井智宏，森西晃嗣，“楕円粒子を含む懸濁液の実効粘度分布に関する数値解析”，日本機械学会 第96期流体工学部門講演会，USB memory，室蘭，2018年11月．
  3. 川口美沙，福井智宏，森西晃嗣，“仮想流束法を用いた懸濁液のレオロジーに関する数値解析”，日本機械学会 関西支部 第93期定時総会講演会，p. 622，寝屋川，2018年3月．
  4. 川口美沙，福井智宏，森西晃嗣，“平行平板間を流れる楕円粒子の運動に関する数値解析”，第31回数値流体力学シンポジウム，USB memory，京都，2017年12月．
  5. 川口美沙，福井智宏，森西晃嗣，“HyperWorksを用いた胸部大動脈内血液流れに関する検討”，第22回 計算工学講演会，Vol. 22 (USB memory)，埼玉，2017年5月．
  6. 川口美沙，福井智宏，森西晃嗣，“仮想流束法を用いた微小血管内流れに関する数値解析”，日本機械学会 関西学生会 平成27年度学生員卒業研究発表講演会，p. 8-1，大阪，2016年3月．

 

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