Soret and Dufour Effects on Double-Diffusive Mixed Convection From a Vertical Wedge in Porous Media with Constant Wall Heat and Mass Fluxes

Abstract

This work studies the Soret and Dufour effects on the double-diffusive mixed convection over a downward-pointing vertical wedge in a porous medium with constant wall heat and mass fluxes. A suitable coordinate transformation is performed, and the obtained nonsimilar equations are then solved by cubic spline collocation method. The effects of the Soret parameter, Dufour parameter, wedge angle parameter, mixed convection variable, Lewis number, and buoyancy ratio on the heat and mass transfer characteristics has been studied. Results show that the local surface temperature is found to increase when the Dufour parameter is increased. Moreover, an increase in the Soret number leads to an increase in the local surface concentration. As the wedge angle parameter is increased, the local surface temperature and the local surface concentration increases for forced convection and forced-convection-dominated mixed convection. The wedge angle parameter is insignificant for natural convection or natural-convection-dominated mixed convection.