UNSTEADY RADIATIVE-CONVECTIVE BOUNDARY-LAYER FLOW OF A CASSON FLUID WITH VARIABLE THERMAL CONDUCTIVITY

The unsteady two-dimensional flow of a non-Newtonian fl uid over a stretching surface with the effects of thermal radiation and variable thermal conductivity is investigated. The Casson fl uid model is used to characterize the nonNewtonian fl uid behavior. First, using a similarity transformation, the governing time-dependent partial differential equations are transformed into coupled nonlinear ordinary differential equations with variable coeffi cients. Then the transformed equations are solved numerically under appropriate boundary conditions by the shooting method. An exact solution corresponding to the momentum equation for a steady case is found. The obtained numerical results are analyzed as to the effect of the pertinent parameters on the fl ow and heat transfer characteristics.
   
Author:  M. Gnaneswara Reddy
Keywords:  unsteady boundary layer, Casson fl uid, variable thermal conductivity, thermal radiation, stretching surface
Page:  240