This paper investigates the electroosmotic micromixing of non-Newtonian fluid in a microchannel with wall-mounted obstacles and surface potential heterogeneity on the obstacle surface. In the numerical simulation, the full model consisting of the Navier–Stokes equations and the Poisson–Nernst–Plank equations are solved for the electroosmotic fluid field, ion transport, and electric field, and the power law model is used to characterize the rheological behavior of the aqueous solution. The mixing performance is investigated under different parameters, such as electric double layer thickness, flow behavior index, obstacle surface zeta potential, obstacle dimension. Due to the zeta potential heterogeneity at the obstacle surface, vortical flow is formed near the obstacle surface, which can significantly improve the mixing efficiency. The results show that, the mixing efficiency can be improved by increasing the obstacle surface zeta potential, the flow behavior index, the obstacle height, the EDL thickness.
Original Publication Citation
Mei, L., Cui, D., Shen, J., Dutta, D., Brown, W., Zhang, L., & Dabipi, I. K. (2021). Electroosmotic mixing of non-newtonian fluid in a microchannel with obstacles and zeta potential heterogeneity. Micromachines, 12(4), 1-11, Article 431. https://doi.org/10.3390/mi12040431
Mei, Lanju; Cui, Defu; Shen, Jiayue; Dutta, Diganta; Brown, Willie; Zhang, Lei; and Dabipi, Ibibia K., "Electroosmotic Mixing of Non-Newtonian Fluid in a Microchannel with Obstacles and Zeta Potential Heterogeneity" (2021). Computational Modeling & Simulation Engineering Faculty Publications. 67.