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

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

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 114704-114704.doi: 10.1088/1674-1056/22/11/114704

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

孙东科, 项楠, 姜迪, 陈科, 易红, 倪中华

Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China

收稿日期:2013-02-17 修回日期:2013-03-13 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
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).

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

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)

Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Received:2013-02-17 Revised:2013-03-13 Online:2013-09-28 Published:2013-09-28
Contact: Sun Dong-Ke, Ni Zhong-Hua E-mail:dongke.sun@gmail.com;nzh2003@seu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: lattice Boltzmann method, multi relaxation time, microchannel, inertial secondary flow

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.

Key words: lattice Boltzmann method, multi relaxation time, microchannel, inertial secondary flow

中图分类号: (Channel flow)

47.27.nd

47.11.-j (Computational methods in fluid dynamics) 04.60.Nc (Lattice and discrete methods)

孙东科, 项楠, 姜迪, 陈科, 易红, 倪中华. Multi-relaxation time lattice Boltzmann simulation of inertial secondary flow in a curved microchannel[J]. 中国物理B, 2013, 22(11): 114704-114704.

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[J]. Chin. Phys. B, 2013, 22(11): 114704-114704.

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

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

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