Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

A lattice Boltzmann study on trade-off between mixing and flow efficiency for electroosmotic flow in heterogeneous microchannels with nonuniform surface potentials

Fuzhi Tian, Daniel Y. Kwok*
Nanoscale Technology and Engineering Laboratory, Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 2G8, Canada

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A lattice Boltzmann model (LBM) is used to simulate electroosmotic flow (EOF) in a rectangular microchannel with nonuniform surface potentials. The simulation results indicate that local circulations can occur near a heterogeneous region. The largest circulations, which imply the highest mixing efficiency due to convection and short-range diffusion, were found when the average surface potentials is zero. More importantly, we have illustrated that there is a trade-off between the mixing and flow efficiency in EOF microfluidics.

Keywords:  LBM; Electroosmotic flow; Nonuniform surface potential; Mixing

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