Effect of surface property on mass flux in a variable-section microchannel

doi:10.1016/j.cjche.2016.10.011

›› 2017, Vol. 25 ›› Issue (4): 401-407.DOI: 10.1016/j.cjche.2016.10.011

• Separation Science and Engineering • Previous Articles Next Articles

Effect of surface property on mass flux in a variable-section microchannel

Weicheng Xu^1,2, Yumei Yong¹, Junbo Xu¹, Chao Yang^1,2

1 Key Laboratory of Green Process and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-03-07 Revised:2016-09-26 Online:2017-06-03 Published:2017-04-28
Supported by:
Supported by National Key Research and Development Program (2016YFB0301701),the National Natural Science Foundation of China (21276256,21490584,91534105).

Effect of surface property on mass flux in a variable-section microchannel

Weicheng Xu^1,2, Yumei Yong¹, Junbo Xu¹, Chao Yang^1,2

1 Key Laboratory of Green Process and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: Yumei Yong, Chao Yang
基金资助:
Supported by National Key Research and Development Program (2016YFB0301701),the National Natural Science Foundation of China (21276256,21490584,91534105).

Abstract

Abstract: For microfluidic systems,interfacial phenomena in micro-reactors are of great importance because they control the transfer and reaction characteristics.This paper dwells on how the surface property and geometry influence the mass flux in a complex microchannel.The lattice Boltzmann method (LBM) with a pseudo potential model and the Shan-Chen model for the interaction between fluid and hydrophobic surface were built up,so a boundary slip effect was added and verified.On this basis,a microchannel with variable-section geometry was simulated.The results indicate that the optimal design and the flow pattern are quite different under hydrophilic and hydrophobic conditions.A microchannel with sequential hydrophilic and hydrophobic surface was also simulated.The numerical results indicate that the hydrophobic wall can improve the mass flux,irrespective of microchannel geometry.Particularly,an empirical correlation with a linearly relationship between length of hydrophobic segment and mass flux was obtained for the straight microchannel.

Key words: Hydrophobic surface, Boundary slip, Complex microchannel, Lattice Boltzmann method

摘要： For microfluidic systems,interfacial phenomena in micro-reactors are of great importance because they control the transfer and reaction characteristics.This paper dwells on how the surface property and geometry influence the mass flux in a complex microchannel.The lattice Boltzmann method (LBM) with a pseudo potential model and the Shan-Chen model for the interaction between fluid and hydrophobic surface were built up,so a boundary slip effect was added and verified.On this basis,a microchannel with variable-section geometry was simulated.The results indicate that the optimal design and the flow pattern are quite different under hydrophilic and hydrophobic conditions.A microchannel with sequential hydrophilic and hydrophobic surface was also simulated.The numerical results indicate that the hydrophobic wall can improve the mass flux,irrespective of microchannel geometry.Particularly,an empirical correlation with a linearly relationship between length of hydrophobic segment and mass flux was obtained for the straight microchannel.

关键词: Hydrophobic surface, Boundary slip, Complex microchannel, Lattice Boltzmann method

Weicheng Xu, Yumei Yong, Junbo Xu, Chao Yang. Effect of surface property on mass flux in a variable-section microchannel[J]. , 2017, 25(4): 401-407.

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Effect of surface property on mass flux in a variable-section microchannel

Effect of surface property on mass flux in a variable-section microchannel

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