Separation of Microparticles Using Dielectrophoresis-Assisted Inertial Microfluidics: A Lattice Boltzmann Simulation
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1Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
2Department of Chemical and Petroleum Engineering, Sharif University of Technology, Azadi Street, Tehran, Iran
In this study, we have simulated the dynamics of microparticles in a straight microchannel in the presence of an inhomogeneous oscillating electric field by immersed boundary method in combination with the lattice Boltzmann Navier-Stokes solver and the lattice Boltzmann method for solving the Poisson equation. We have examined the effect of the electric field on the location and number of particle equilibrium positions. In the absence of the electric field, circular particles migrate to two stable equilibrium positions, depending on their sizes. By application of the electric field with high frequency, equilibrium positions change. For each particle, there exists a specific voltage so-called crossover voltage at which the equilibrium position near electrodes disappear, and particles migrate to the other equilibrium position far from the electrodes. The upper equilibrium position is not influenced by the electric field. Finally, we have introduced a novel two-step DEP-assisted inertial microfluidics mechanism for particle separation, based on the crossover voltages and crossover frequencies of different particles.