Inertial migration of deformable droplets in a microchannel | |
Chen XD(陈晓东)![]() ![]() ![]() ![]() | |
刊名 | Physics of Fluids
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2014-11-21 | |
通讯作者邮箱 | guoqing.hu@imech.ac.cn ; sunjs@nanoctr.cn |
卷号 | 26期号:11页码:112003 |
关键词 | Microfluidics Inertial migration Droplets Multi-phase simulation |
ISSN号 | 1070-6631 |
通讯作者 | Hu GQ(胡国庆), State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics,Chinese Academy of Sciences, Beijing 100190, China ; Sun JS(孙佳姝), Beijing Engineering Research Center for BioNanotechnology and Key Lab for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, China |
产权排序 | [Chen, Xiaodong; Xue, Chundong; Hu, Guoqing] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Zhang, Li] Synfuels China Technol Co Ltd, Res & Dev Ctr, Beijing 101407, Peoples R China; [Jiang, Xingyu; Sun, Jiashu] Natl Ctr Nanosci & Technol, Beijing Engn Res Ctr BioNanotechnol, Beijing 100190, Peoples R China; [Jiang, Xingyu; Sun, Jiashu] Natl Ctr Nanosci & Technol, Key Lab Biol Effects Nanomat & Nanosafety, Beijing 100190, Peoples R China |
合作状况 | 国内 |
中文摘要 | The microfluidic inertial effect is an effective way of focusing and sorting droplets suspended in a carrier fluid in microchannels. To understand the flow dynamics of microscale droplet migration, we conduct numerical simulations on the droplet motion and deformation in a straight microchannel. The results are compared with preliminary experiments and theoretical analysis. In contrast to most existing literature, the present simulations are three-dimensional and full length in the streamwise direction and consider the confinement effects for a rectangular cross section. To thoroughly examine the effect of the velocity distribution, the release positions of single droplets are varied in a quarter of the channel cross section based on the geometrical symmetries. The migration dynamics and equilibrium positions of the droplets are obtained for different fluid velocities and droplet sizes. Droplets with diameters larger than half of the channel height migrate to the centerline in the height direction and two equilibrium positions are observed between the centerline and the wall in the width direction. In addition to the well-known Segré-Silberberg equilibrium positions, new equilibrium positions closer to the centerline are observed. This finding is validated by preliminary experiments that are designed to introduce droplets at different initial lateral positions. Small droplets also migrate to two equilibrium positions in the quarter of the channel cross section, but the coordinates in the width direction are between the centerline and the wall. The equilibrium positions move toward the centerlines with increasing Reynolds number due to increasing deformations of the droplets. The distributions of the lift forces, angular velocities, and the deformation parameters of droplets along the two confinement direction are investigated in detail. Comparisons are made with theoretical predictions to determine the fundamentals of droplet migration in microchannels. In addition, existence of the inner equilibrium position is linked to the quartic velocity distribution in the width direction through a simple model for the slip angular velocities of droplets. |
学科主题 | 多相流 |
分类号 | 一类/力学重要期刊 |
收录类别 | SCI ; EI |
原文出处 | http://scitation.aip.org/content/aip/journal/pof2/26/11/10.1063/1.4901884 |
语种 | 英语 |
WOS记录号 | WOS:000345578700009 |
公开日期 | 2014-12-16 |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/49374] ![]() |
专题 | 力学研究所_非线性力学国家重点实验室 |
推荐引用方式 GB/T 7714 | Chen XD,Xue CD,Zhang L,et al. Inertial migration of deformable droplets in a microchannel[J]. Physics of Fluids,2014,26(11):112003. |
APA | Chen XD,Xue CD,Zhang L,Hu GQ,Jiang XY,&Sun JS.(2014).Inertial migration of deformable droplets in a microchannel.Physics of Fluids,26(11),112003. |
MLA | Chen XD,et al."Inertial migration of deformable droplets in a microchannel".Physics of Fluids 26.11(2014):112003. |
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