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

doi:10.1088/1674-1056/22/11/114704

Abstract The inertial secondary flow is particularly important for hydrodynamic focusing and particle manipulation in biomedical research. In this paper, the development of the inertial secondary flow structure in a curved microchannel was investigated 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 vortexes. 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.

Keywords: lattice Boltzmann method multi relaxation time microchannel inertial secondary flow

Received: 17 February 2013
Revised: 13 March 2013
Accepted manuscript online:

PACS:	47.27.nd	(Channel flow)
	47.11.-j	(Computational methods in fluid dynamics)
	04.60.Nc	(Lattice and discrete methods)

Fund: 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), and the National Science Foundation for Post-doctoral Scientists of China (Grant No. 2012M511647).

Corresponding Authors: Sun Dong-Ke, Ni Zhong-Hua
E-mail: dongke.sun@gmail.com;nzh2003@seu.edu.cn

Cite this article:

Sun Dong-Ke (孙东科), Xiang Nan (项楠), Jiang Di (姜迪), Chen Ke (陈科), Yi Hong (易红), Ni Zhong-Hua (倪中华) Multi-relaxation time lattice Boltzmann simulation of inertial secondary flow in a curved microchannel 2013 Chin. Phys. B 22 114704

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

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