管流中颗粒“惯性聚集”现象的研究进展及其在微流动中的应用

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doi:10.6052/1000-0992-12-052

王企鲲^1,,,
孙仁²

1 上海理工大学能源与动力工程学院, 上海 200093
2 上海交通大学工程力学系, 上海 200240

基金项目:国家自然科学基金项目(10872130), 高等学校博士学科点专项科研基金(20113120120003)资助

详细信息

作者简介:
王企鲲, 男, 工学博士, 副教授, 中国机械工程学会高级会员, 上海力学学会会员. 主要研究领域为: 叶轮机械流体动力学、低Re数黏性流体力学、生物流体力学等.

通讯作者:
王企鲲

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出版历程
- 收稿日期:2012-04-05
- 修回日期:2012-09-12
- 刊出日期:2012-11-25

ADVANCES IN THE RESEARCH ON “INERTIAL FOCUS OF PARTICLES” AND ITS APPLICATION IN MICROFLUIDICS

WANG Qikun^1,,,
SUN Ren²

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2 Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China

Funds:The project was supported by the National Natural Science Foundation of China (10872130) and the Special Foundation of Specialties Leading to Doctor Degree for Chinese Institution of Higher Education (20113120120003).

More Information

Corresponding author:WANG Qikun

摘要

摘要:当随机散布细颗粒的流体以低 Re数层流流入直管时, 经过一段距离的流动后, 这些颗粒会被稳定地聚集在一个离管道中心固定距离的同心圆环位置上运动. 这种运动特征被称为颗粒“惯性聚集”现象. 该现象表明: 在相应的 Re数管流中, 颗粒除受到流体沿主流方向的驱动力同时, 还受到垂直于主流的横向力的作用. 这种横向力是使颗粒产生聚集运动现象的主要原因, 被认为是由于流场的惯性力对颗粒的作用.
- 颗粒惯性聚集, 低Re数层流, 管道内流, 固-液两相流, 微流体控制
Abstract:When a flow with randomly dispersed small particles enters a straight pipe at low Reynolds numbers, the particles may migrate to an annulus centered at the axis of the pipe after a migration distance. This migration is called as ‘Inertial Focus of Particles’, which indicates that in the creeping flow there are transverse forces exerted on the immersed particles apart from viscous drags. It is the transverse force that results in the phenomenon, and it is usually regarded as an effect of the inertial force of the flow field on the particles. Recently, the phenomenon is attracting the attention of more and more researchers. Further research on it will not only reveal the interesting dynamic behaviors of both particles and colloids in a micro-channel and organisms in a blood vessel, but also assist us in the exploitation of such separation technology with high efficiency and low energy consumption. This paper summarizes recent advances in this area and presents some suggestions for future research.
- inertial focus of particles, laminar flow with low reynolds number, internal flow in Channels, solid-liquid flow, microfluidic control

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