Multi-relaxation time lattice Boltzmann simulation of inertial secondary flow in a curved microchannel  

作　　者：孙东科 项楠 姜迪 陈科 易红 倪中华 

机构地区：[1]Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments,School of Mechanical Engineering, Southeast University

出　　处：《Chinese Physics B》2013年第11期376-384,共9页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2011CB707601);the National Natural Science Foundation of China(Grant Nos.51306037 and 51375089);the National Science Foundation for Post-doctoral Scientists of China(Grant No.2012M511647)

摘　　要：The inertial secondary flow is particularly important tbr hydrodynamic lbcusing and particle manipulation m biomed- ical research. In this paper, the development of the inertial secondary flow structure in a curved microchannel was investi- gated by the multi relaxation time lattice Boltzmann equation model with a force term. The numerical results indicate that the viscous and inertial competition dominates the development of secondary flow structure development. The Reynolds number, Dean number, and the cross section aspect ratio influence significantly on the development of the secondary vor- texes. Both the intensity of secondary flow and the distance between the normalized vortex centers are functions of Dean numbers but independent of channel curvature radius. In addition, the competition mechanism between the viscous and inertial effects were discussed by performing the particle focusing experiments. The present investigation provides an improved understanding of the development of inertial secondary flows in curved microchannels.The inertial secondary flow is particularly important tbr hydrodynamic lbcusing and particle manipulation m biomed- ical research. In this paper, the development of the inertial secondary flow structure in a curved microchannel was investi- gated by the multi relaxation time lattice Boltzmann equation model with a force term. The numerical results indicate that the viscous and inertial competition dominates the development of secondary flow structure development. The Reynolds number, Dean number, and the cross section aspect ratio influence significantly on the development of the secondary vor- texes. Both the intensity of secondary flow and the distance between the normalized vortex centers are functions of Dean numbers but independent of channel curvature radius. In addition, the competition mechanism between the viscous and inertial effects were discussed by performing the particle focusing experiments. The present investigation provides an improved understanding of the development of inertial secondary flows in curved microchannels.

关 键 词：lattice Boltzmann method multi relaxation time MICROCHANNEL inertial secondary flow 

分 类 号：O35[理学—流体力学] TB302.3[理学—力学]