Effects of slip on unsteady mixed convective flow and heat transfer past a porous stretching surface

This paper investigates the unsteady mixed convective boundary layer flow and heat transfer over a porous stretching vertical surface in presence of slip. Similarity solutions for the transformed governing equations are obtained and the reduced equations are then solved numerically. With increasing values of the unsteadiness parameter, fluid velocity and the temperature are found to decrease in both the presence and absence of slip at the boundary. Fluid velocity decreases due to increasing values of the velocity slip parameter resulting an increase in the temperature field. Skin-friction decreases with the velocity slip parameter whereas it increases with unsteadiness parameter. The rate of heat transfer decreases with the velocity slip parameter while increases with unsteadiness parameter. Same feature is also noticed for thermal slip parameter. Effects of increasing mixed convection parameter on the velocity boundary layer is to increase the velocity field and the temperature decreases in this case.

► Flow and temperature field are significantly influenced by unsteadiness parameter.
► Velocity increases with the increase in mixed convection parameter.
► Increasing the flow slip parameter causes the decrease in the flow velocity.
► With increasing thermal slip parameter heat transfer becomes slower.