Abstract
The main objective of the present study is to analyze the effects of slip velocity and heat generation/absorption on the time-dependent stagnation-point flow and heat transfer of a nanofluid over a stretching sheet in a porous medium. The influence of chemical reaction is also considered. The behavior of the nanofluid was investigated for three different nanoparticles in the H2O-base fluid, namely (Cu-NPs), (Al2O3-NPs) and (TiO2-NPs). The similarity solution is used to reduce the governing system of PDEs to a set of non-linear ODEs which are then solved numerically using the fourth-order Runge-Kutta method along with shooting technique. The results corresponding to the dimensionless velocity, temperature and concentration profiles, also the skin friction, the local Nusselt number and the local Sherwood number are displayed graphically for various pertinent parameters. It is found that the heat and mass transfer rates are enhanced with a destructive chemical reaction R > 0 and the opposite influence is found with heat generation.