Numerical simulation of dispersion generated by a 180° turn in a microchannel
Yao Zhao-Hui (姚朝晖)ab, G. L. Yoderb, C. T. Culbertsonc, J. M. Ramseyc
a Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; b; Engineering Technology Division, Oak Ridge National Laboratory, P.O. Box 2009, Oak Ridge, Tennessee 37831-8045, USA; c Chemical and Analytical Sciences Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, Tennessee 37831-6142, USA
Abstract A numerical scheme is developed to simulate electro-osmotic flow and mass transport in a microchannel which includes a 180° turn. The model has been used to predict the behaviour of electro-osmotically driven flows. The detailed structure of the flow field in a microchannel in combination with species mass diffusion can explain the concentration dispersion introduced by a 180° turn. The results of our simulations agree both qualitatively and quantitatively with experimental observation. It is demonstrated that an improved electro-osmotic force model could simulate the electrokinetically driven flow well without making detailed calculations of the electric charge density distribution within the electrical double layer. Additionally, because this model applies forces to the liquid as opposed to imposing local velocities, it should also be appropriate for use where pressure gradients exist in the flow field.
Received: 11 July 2001
Revised: 18 November 2001
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 19902009).
Cite this article:
Yao Zhao-Hui (姚朝晖), G. L. Yoder, C. T. Culbertson, J. M. Ramsey Numerical simulation of dispersion generated by a 180° turn in a microchannel 2002 Chinese Physics 11 226
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