Prediction of a temperature-dependent electroosmotically driven microchannel flow with the Joule heating effect
Resource
International Journal of Numerical Methods for Heat & Fluid Flow, 22(5), 554-575
Journal
International Journal of Numerical Methods for Heat & Fluid Flow
Journal Volume
22
Journal Issue
5
Pages
554-575
Date Issued
2012
Date
2012
Author(s)
Abstract
Purpose A convection‐diffusion‐reaction scheme is proposed in this study to simulate the high gradient electroosmotic flow behavior in microchannels. The equations governing the total electric field include the Laplace equation for the effective electrical potential and the Poisson‐Boltzmann equation for the electrical potential in the electric double layer. Design/methodology/approach Mixed electroosmotic/pressure‐driven flow in a straight microchannel is studied with the emphasis on the Joule heat in the equations of motion. The nonlinear behaviors resulting from the hydrodynamic, thermal and electrical three‐field coupling and the temperature‐dependent fluid viscosity, thermal conductivity, electrical permittivity, and conductivity of the investigated buffer solution are analyzed. Findings The solutions computed from the employed flux discretization scheme for the hydrodynamic, thermal and electric field equations have been verified to have good agreement with the analytical solution. Parametric studies have been carried out by varying the electrical conductivity at the fixed zeta potential and varying the zeta potential at the fixed electrical conductivity. Originality/value Investigation is also addressed on the predicted velocity boundary layer and the electric double layer near the negatively charged channel wall.
SDGs
Type
journal article
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