Application of lattice Boltzmann method to simulate a pressure-affected electroosmotic pump with hydrophobic thermally-jumped walls and temperature-sensitive operating fluid

Abstract

The present work attempts to show the accuracy of lattice Boltzmann method (LBM) to study a liquid flow with volumetric forces of electroosmotic and pressure gradient over hydrophobic surfaces. Navier boundary condition, slip velocity and temperature jump are taken into account. The flow has temperature-dependent physical properties and assumed to be laminar, steady and viscous. Joule heating effects and velocity distribution within channel are studied and verified by comparing the numerically computed slip length with the coefficient of velocity derivative at the wall. The results show that unlike no-slip condition, velocity and temperature magnitude in the middle and near wall region have approximately the same significant growth. Slip amplifies the effect of fluid properties changes on the wall heat transfer rate; because it increases the temperature derivative at the channel wall.