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Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
December, 14-17, 2023, Bihar, India

Electroosmotic flow and micromixing of Carreau fluid in a nozzle-diffuser shaped microchannel connected with a microchamber

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.2070
pages 1277-1282


The study delves into the enhancement of micro-mixing techniques for various neutral eluted species through the incorporation of surface heterogeneity within an electrokinetic framework. The primary objective is to predict the efficacy and precision of micro-mixing for rapid and accurate mixing. A computational investigation is conducted to assess the mixing efficiency of an electroosmotic micromixer, featuring a microchannel with a nozzle-diffuser configuration and a central microchamber. The numerical simulations employ the Poisson-Nernst-Planck-based Cauchy momentum equations, considering a non-Newtonian fluid adhering to the Carreau model. By analyzing the microchamber's design, surface heterogeneity, and the electric double layer's thickness, this study scrutinizes their impacts on the flow dynamics within the electroosmotic micromixer, aiming to establish optimal mixing conditions. Furthermore, the study highlights the superior mixing performance of shear-thickening fluids compared to shear-thinning fluids, a finding of significance in the advancement of innovative micromixer fabrication techniques.