Joule heating and viscous dissipation effect on electroosmotic mixed convection flow in a vertical microchannel subjected to asymmetric heat fluxes

The impact of Joule heating due to electric double layer (EDL) and viscous dissi-pation on electroosmotic mixed convection flow in a vertical microchannel with asymmetric heat fluxes is established in this article. The Poisson-Boltzmann, momentum and energy equa-tions representing the electric potential, velocity profile and temperature distribution in the mi-crochannel are obtained in dimensionless forms. Using the Debye-Huckel linearization, exact solutions are obtained for electric potential, velocity profile and temperature distributions by method of undetermined coefficients in the absence of viscous dissipation and Joule heating while an inbuilt Matlab function called pdepe is employed to solve the coupled nonlinear mo-mentum and energy equations in the presence of Joule heating and viscous dissipation. Results show that the presence of Joule heating and viscous dissipation lead to decrease in velocity pro-file and temperature distributions throughout the microchannel. (C) 2021 Beihang University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.