Study on the mixing of fluid in curved microchannelswith heterogeneous surface potentials |
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Authors: | Lin Jian-Zhong Zhang Kai and Li Hui-Jun |
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Institution: | Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China; China Jiliang University, Hangzhou 310018, China |
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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. |
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Keywords: | microchannel mixing efficiency electroosmosis numerical simulation |
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