SCI和EI收录∣中国化工学会会刊

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

• Separation Science and Engineering • 上一篇    下一篇

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

Weicheng Xu1,2, Yumei Yong1, Junbo Xu1, Chao Yang1,2   

  1. 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
  • 收稿日期:2016-03-07 修回日期:2016-09-26 出版日期:2017-04-28 发布日期:2017-06-03
  • 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).

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

Weicheng Xu1,2, Yumei Yong1, Junbo Xu1, Chao Yang1,2   

  1. 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:2017-04-28 Published:2017-06-03
  • Supported by:
    Supported by National Key Research and Development Program (2016YFB0301701),the National Natural Science Foundation of China (21276256,21490584,91534105).

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

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