Abstract. The flow and heat transfer over a stretching sheet with a magnetic field in an electrically conducting ambient fluid have been studied. The effects of the induced magnetic field and sources or sinks have been included in the analysis. Both non-isothermal wall and constant heat flux conditions have been considered. The governing equations have been solved numerically using a shooting method. It is observed that for the prescribed wall temperature the skin friction, induced magnetic field at the wall and heat transfer are enhanced due to the magnetic field, but in general, they reduce as the reciprocal of the magnetic Prandtl number increases. For constant heat flux case, the temperature at the wall reduces as the magnetic field increases, but it increases with the reciprocal of the magnetic Prandtt number. The heat transfer is strongly affected by the Prandtl number, wall temperature and sink. When m < -2 and Pr > 2.5 the unrealistic temperature distributions are encountered. The present analysis is more general than any previous investigation.
MHD
The steady mixed convection¯ow over a vertical wedge with a magnetic ®eld embedded in a porous medium has been investigated. The effects of the permeability of the medium, surface mass transfer and viscous dissipation on the¯ow and temperature ®elds have been included in the analysis. The coupled nonlinear partial differential equations governing the¯ow ®eld have been solved numerically using the Keller box method. The skin friction and heat transfer are found to increase with the parameters characterizing the permeability of the medium, buoyancy force, magnetic ®eld and pressure gradient. However the effect of the permeability and magnetic ®eld on the heat transfer is very small. The heat transfer increases with the Prandtl number, but the skin friction decreases. The buoyancy force which assists the forced convection¯ow causes an overshoot in the velocity pro®les. Both the skin friction and heat transfer increase with suction and the effect of injection is just the reverse.
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