Suspension Rheology Control and Rheology Assessment System Learned from Red Blood Cells

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04266
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Kyoto Institute of Technology
• Principal Investigator: Fukui Tomohiro 京都工芸繊維大学, 機械工学系, 准教授 (00451542)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: レオロジー / 懸濁液 / 混相流 / 非ニュートン流体

Outline of Final Research Achievements

In a narrow channel, the apparent relative viscosity of a suspension with finite-size particles is strongly dependent on its microscopic particle arrangement. In this study, we focus on the inertia and concentration of particles in a narrow channel and consider their effects on the microscopic particle arrangement and macroscopic suspension rheology. The results demonstrated that the velocity profiles for the particle suspension were changed by the Reynolds number and particle concentration because of the interactions between particles according to the power-law index. These changes affected the particle equilibrium positions in the channel, and the subsequent changes in solvent layer thickness caused changes in the macroscopic apparent viscosity. The behavior of microscopic particles played important roles in determining macroscopic rheology.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果により，次のような学術的・社会的意義が示された．まず，粒子慣性力と力学的平衡位置の関係の体系的な理解が一層深まることにより，懸濁液のレオロジーコントロールが可能であることが期待された．次に，アインシュタインの粘度式を適用することができない力学環境においても，新しく提案した粘度推定式により，様々な分散状態における瞬時速度場のスナップショットから，懸濁液の実効粘度評価が可能であることが期待された．