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)
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
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.
Received: 26 March 2006
Revised: 12 May 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation (Grant No
10372090) and the Doctoral Program of Higher Education of China (Grant No
20030335001).
Cite this article:
Lin Jian-Zhong(林建忠), Zhang Kai(张凯), and Li Hui-Jun (李惠君) Study on the mixing of fluid in curved microchannelswith heterogeneous surface potentials 2006 Chinese Physics 15 2688
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