MHD boundary layer heat and mass transfer of a chemically reacting Casson uid over a permeable stretching surface with non-uniform heat source/sink

The heat and mass transfer analysis for MHD Casson uid boundary layer ow over a permeable stretching sheet through a porous medium is carried out. The eect of non-uniform heat gener- ation/absorption and chemical reaction are considered in heat and mass transport equations corre- spondingly. The heat transfer analysis has been carried out for two dierent heating processes namely; the prescribed surface temperature (PST) and prescribed surface heat ux (PHF). After transforming the governing equations into a set of non-linear ordinary dierential equations, the numerical solutions are generated by an ecient Runge-Kutta-Fehlberg fourth-fth order method. The solutions are found to be dependent on physical parameters such as Casson uid parameter, magnetic parameter, porous parameter, Prandtl and Schmidt number, heat source/sink parameter, suction/injection parameter and chemical reaction parameter. Typical results for the velocity, temperature and concentration proles as well as the skin-friction coecient, local Nusselt number and local Sherwood number are presented for dierent values of these pertinent parameters to reveal the tendency of the solutions. The obtained results are compared with earlier results with some limiting cases of the problem and found to be in good agreement.

Casson uid; Heat mass transfer; Non-uniform heat source/sink; Numerical solution; Porous medium; Chemical reaction; Stretching sheet.