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