EFFECTS OF THERMAL RADIATION ON MHD AND SLIP FLOW OVER A POROUS ROTATING DISK WITH VARIABLE PROPERTIES

摘要

The combined hydromagnetic and slip flow of a steady, laminar conducting viscous fluid in the presence of thermal radiation due to an impulsively started rotating porous disk is studied taking into account the variable fluid properties (density, p, viscosity, μ, and thermal conductivity, k). These fluid properties are taken to be dependent on temperature. The system of axisymmetric nonlinear partial differential equations governing the MHD steady flow and heat transfer are written in cylindrical polar coordinates and reduced to nonlinear ordinary differential equations by introducing suitable similarity parameters. The resulting steady equations are reduced to an initial valued problem and solved numerically using a shooting method. A parametric study of all parameters involved was conducted, and a representative set of results showing the effect of the magnetic field (M), the radiation parameter (N), slip factor (γ) the uniform suction parameter (W ＜ 0) and the relative temperature difference parameter (∈) on velocities, temperature, skin-friction and Nusselt number are illustrated graphically. The numerical values of the wall shear stress and surface heat transfer are shown in tabular form, discussed quantitatively for parameter values of practical interest from physical point of view.