NUMERICAL STUDY OF AN ELECTRO-OSMOTICALLY DRIVEN MICROCHANNEL FLOW WITH JOULE HEATING EFFECT

摘要

A convection-diffusion reaction scheme is applied to solve the transient transport equations for the prediction of steady electro-osmotic microchannel flow behavior. The governing equations for the total electric field include the Laplace equation for the effec_tive electrical potential and the Poisson-Boltzmann equation for the electrical potential established in the electric double layer. The transport equations governing the hydro_dynamic field variables comprise mass conservation equation for the electrolyte and equa_tions of motion for the incompressible charged fluid flow subject to an electro-osmotic body force. The main aim of the study is to elucidate the effect of Joule heating, which can affect the electrohydrodynamic behavior. Investigation into the region near the nega_tively charged channel wall is made through the simulated velocity boundary layer, diffuse layer, and electric double layer.