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首页> 外文期刊>Physics of fluids >Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters
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Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters

机译：矩形微通道圆柱形颗粒的惯性迁移：平衡位置和等同直径的变化

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摘要

Inertial migration has emerged as an efficient tool for manipulating both biological and engineered particles that commonly exist with non-spherical shapes in microfluidic devices. There have been numerous studies on the inertial migration of spherical particles, whereas the non-spherical particles are still largely unexplored. Here, we conduct three-dimensional direct numerical simulations to study the inertial migration of rigid cylindrical particles in rectangular microchannels with different width/height ratios under the channel Reynolds numbers (Re) varying from 50 to 400. Cylindrical particles with different length/diameter ratios and blockage ratios are also concerned. Distributions of surface force with the change of rotation angle show that surface stresses acting on the particle end near the wall are the major contributors to the particle rotation. We obtain lift forces experienced by cylindrical particles at different lateral positions on cross sections of two types of microchannels at various Re. It is found that there are always four stable equilibrium positions on the cross section of a square channel, while the stable positions are two or four in a rectangular channel, depending on Re. By comparing the equilibrium positions of cylindrical particles and spherical particles, we demonstrate that the equivalent diameter of cylindrical particles monotonously increases with Re. Our work indicates the influence of a non-spherical shape on the inertial migration and can be useful for the precise manipulation of non-spherical particles. Published by AIP Publishing.
机译：惯性迁移是一种有效的工具，用于操纵在微流体装置中具有非球形形状的生物和工程化颗粒的有效工具。有许多关于球形颗粒的惯性迁移的研究，而非球形颗粒仍然很大程度上是未探斗的。在这里，我们进行三维直接数值模拟，以研究刚性微通道中刚性圆柱形颗粒的惯性迁移，在频道雷诺数（RE）下方的不同宽度/高度比从50-400变化。具有不同长度/直径比的圆柱形颗粒并且封闭比率也涉及。随着旋转角度的变化的表面力分布表明，在墙壁附近的粒子上作用的表面应力是颗粒旋转的主要贡献者。我们获得在不同横向位置的圆柱形颗粒上经历的升降力，在各种RE的两种微通道的横截面上。结果发现，在方向道的横截面上总是有四个稳定的平衡位置，而稳定位置是矩形通道中的两个或四个，这取决于RE。通过比较圆柱形颗粒和球面颗粒的平衡位置，我们证明圆柱形颗粒的等效直径单调与RE增加。我们的作品表明非球形形状对惯性迁移的影响，可用于非球形颗粒的精确操作。通过AIP发布发布。

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  • 来源
    《Physics of fluids》 |2018年第3期|共13页
  • 作者

    Su Jinghong; Chen Xiaodong; Hu Guoqing;

  • 作者单位

    Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech LNM Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech LNM Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech LNM Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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