中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2688-2696.doi: 10.1088/1009-1963/15/11/038

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Study on the mixing of fluid in curved microchannelswith heterogeneous surface potentials

张凯1, 李惠君1, 林建忠2   

  1. (1)Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; (2)Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;China Jiliang University, Hangzhou 310018, China
  • 收稿日期:2006-03-26 修回日期:2006-05-12 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation (Grant No 10372090) and the Doctoral Program of Higher Education of China (Grant No 20030335001).

Study on the mixing of fluid in curved microchannelswith heterogeneous surface potentials

Lin Jian-Zhong(林建忠)a)b)† , Zhang Kai(张凯)a), and Li Hui-Jun (李惠君)a)   

  1. a Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; b China Jiliang University, Hangzhou 310018, China
  • Received:2006-03-26 Revised:2006-05-12 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation (Grant No 10372090) and the Doctoral Program of Higher Education of China (Grant No 20030335001).

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摘要： In this paper the mixing of a sample in the curved microchannel with heterogeneous surface potentials is analysed numerically by using the control-volume-based finite difference method. The rigorous models for describing the wall potential and external potential are solved to get the distribution of wall potential and external potential, then momentum equation is solved to get the fully developed flow field. Finally the mass transport equation is solved to get the concentration field. The results show that the curved microchannel has an optimized capability of sample mixing and transport when the heterogeneous surface is located at the left conjunction between the curved part and straight part. The variation of heterogeneous surface potential $\psi_{\rm n}$has more influence on the capability of sample mixing than on that of sample transport. The ratio of the curved microchannel's radius to width has a comparable effect on the capability of sample mixing and transport. The conclusions above are helpful to the optimization of the design of microfluidic devices for the improvement of the efficiency of sample mixing.

关键词: microchannel, mixing efficiency, electroosmosis, numerical simulation

Abstract: In this paper the mixing of a sample in the curved microchannel with heterogeneous surface potentials is analysed numerically by using the control-volume-based finite difference method. The rigorous models for describing the wall potential and external potential are solved to get the distribution of wall potential and external potential, then momentum equation is solved to get the fully developed flow field. Finally the mass transport equation is solved to get the concentration field. The results show that the curved microchannel has an optimized capability of sample mixing and transport when the heterogeneous surface is located at the left conjunction between the curved part and straight part. The variation of heterogeneous surface potential $\psi_{\rm n}$ has more influence on the capability of sample mixing than on that of sample transport. The ratio of the curved microchannel's radius to width has a comparable effect on the capability of sample mixing and transport. The conclusions above are helpful to the optimization of the design of microfluidic devices for the improvement of the efficiency of sample mixing.

Key words: microchannel, mixing efficiency, electroosmosis, numerical simulation

中图分类号:  (Mixing?)

  • 47.51.+a
47.10.A- (Mathematical formulations) 47.60.-i (Flow phenomena in quasi-one-dimensional systems)