粘弹性
剪切减薄
雷诺数
机械
物理
牛顿流体
Lift(数据挖掘)
剪切流
剪切速率
粘度
流变学
经典力学
剪切(地质)
非牛顿流体
动力学(音乐)
流体力学
热力学
湍流
材料科学
数据挖掘
复合材料
计算机科学
声学
作者
S. Hazra,A. Nath,Sushanta K. Mitra,A. K. Sen
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2021-05-01
卷期号:33 (5)
被引量:9
摘要
Despite growing interest in the focusing and manipulation of particles in non-Newtonian fluids in confined flows, the combined effect of viscoelastic and shear-thinning effects on particle dynamics is not well understood. Herein, we report the dynamics of rigid microparticles in confined flows of strongly shear-thinning viscoelastic (STVE) fluids at very low Reynolds numbers. Our experiments with different STVE fluids reveal five different regimes: original streamline, bimodal, center migration, defocusing, and wall migration (WM), depending upon the fluid properties and flow rates. It is found that the occurrence of the different regimes depends on the STVE parameter (ψ) and average strain rate (γ̇¯). We find that the dynamics of particles in the different regimes is underpinned by the synergy between viscoelastic lift force (FVE) and shear-thinning lift force (FST). Numerical simulation results of strain rate and viscosity profiles at different ψ and γ̇¯ enable estimation of the forces and explaining the dynamics observed. We expect that our study will find relevance in applications involving positioning and manipulation of particles in confined flows of STVE fluids.
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