COMBINED HEAT AND MASS TRANSFER IN MHD FREE CONVECTION FROM A WEDGE WITH OHMIC HEATING AND VISCOUS DISSIPATION IN THE PRESENCE OF SUCTION OR INJECTION

Document Type: Regular Paper

Authors

1 Centre for Science Studies, University of Tun Hussein Onn, Malaysia, 86400 Parit Raja, Batu Pahat Johor, Malaysia

2 School of Mathematical Sciences, University of Kebangsaan, Malaysia, 43600 UKM Bangi Selangor, Malaysia

Abstract

The problem of combined heat and mass transfer of an electrically conducting fluid in MHD
natural convection adjacent to a vertical surface is analyzed, taking into account the effects of Ohmic heating
in the presence of suction or injection. An approximate numerical solution for the steady laminar boundarylayer
flow over a wall of the wedge in the presence of species concentration and mass diffusion has been
obtained by solving the governing equations using the numerical technique. The fluid is assumed to be
viscous and incompressible. Numerical calculations are carried out for different values of dimensionless
parameters and an analysis of the results obtained shows that the flow field is influenced appreciably by the
magnetic effect, the buoyancy ratio between species and thermal diffusion and suction/injection at the wall
surface. Effects of these major parameters on transport behaviors are investigated methodically and typical
results are illustrated to reveal the tendency of the solutions. Representative results are presented for the
velocity, temperature, and concentration distributions, as well as the local skin-friction coefficient and skin
friction.

Keywords