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Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters
Su JH(苏敬宏); Chen XD(陈晓东); Hu GQ(胡国庆)
2018-03-01
发表期刊PHYSICS OF FLUIDS
卷号30期号:3页码:32007
ISSN1070-6631
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.
DOI10.1063/1.5018714
URL查看原文
收录类别SCI ; EI
语种英语
WOS记录号WOS:000428930500023
关键词[WOS]BUOYANT CIRCULAR-CYLINDERS ; PLANE POISEUILLE FLOW ; SHEAR-FLOW ; SPHERICAL-PARTICLES ; MICROFLUIDIC DEVICE ; DIRECT SIMULATION ; REYNOLDS-NUMBERS ; SEPARATION ; FLUID ; MOTION
WOS研究方向Mechanics ; Physics, Fluids & Plasmas
WOS类目Mechanics ; Physics
项目资助者National Natural Science Foundation of China (NSFC) [11572334, 11402274, 11772343] ; CAS Strategic Priority Research Program [XDB22040403] ; CAS Key Research Program of Frontier Sciences [QYZDB-SSW-JSC036]
论文分区一类/力学重要期刊
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77911
专题非线性力学国家重点实验室
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
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Su JH,Chen XD,Hu GQ. Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters[J]. PHYSICS OF FLUIDS,2018,30(3):32007.
APA 苏敬宏,陈晓东,&胡国庆.(2018).Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters.PHYSICS OF FLUIDS,30(3),32007.
MLA 苏敬宏,et al."Inertial migrations of cylindrical particles in rectangular microchannels: Variations of equilibrium positions and equivalent diameters".PHYSICS OF FLUIDS 30.3(2018):32007.
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