Abstract. In this paper, a type of DC-drive electroosmotic micro-mixer is proposed by numerical simulation. The model was built and optimized with multi-field coupling technique in finite element formation, in which the mixing efficiency was controlled by changing the Zeta potential distribution of the wall to make it under different driving voltage. In conclusion: (1) Significantly different characters can be observed by different zeta distribution settings; (2) Intensity of mixing can be improved by forming vortex with adequate size in the interface where the solute diffuse; (3) Compared with alternating current, the mixture in channel forced by direct current can get a more stable mixing performance.
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