Abstract
Improvement of the mixaing index of low Reynolds number flows in microdimensional devices is essential. This paper investigates the enhancement of the mixing index in a three-dimensional micromixer using an electrically conductive microparticle. The governing equations of the induced-charged electrokinetics based on the thin electric double layer (EDL) assumption are numerically solved using the finite element-based COMSOL Multiphysics (Version 5.3a) software. The effects of various parameters on the mixing process were studied. These parameters include: particle size, chamber height size, position of the particle (initial and equilibrium condition), diameter of inlet and outlet and the Zeta potential distribution over the particle. The three-dimensional simulation improves the comparisons for shape of the chamber as compared with two-dimensional. Therefore, the effect of various shape microchamber (spherical, cylindrical and rectangular-cubic) was investigated. The results indicate that for achieving the perfect mixing index, it is necessary to place the conductive particle at the equilibrium condition. Also, present computational simulations show that the spherical chamber is the appropriate choice which can improve the mixing within the microchannel.
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