Dual solutions of MHD stagnation point flow and heat transfer over a stretching/shrinking sheet with generalized slip condition

ABBAS Zaheer¹, MASOOD Tahmina¹, OLANREWAJU Philip Oladapo²

(1. Department of Mathematics, the Islamia University of Bahawalpur, 63100, Bahawalpur, Pakistan;
2. Department of Mathematical Sciences, Oduduwa University, Ipetumodu, Ile-Ife, Nigeria)

Abstract:An analysis was made to study the steady momentum and heat transfer characteristics of a viscous electrically conducting fluid near a stagnation point due to a stretching/shrinking sheet in the presence of a transverse magnetic field and generalized slip condition. two flow problems corresponding to the planar and axisymmetric stretching/shrinking sheet were considered. By means of similarity transformations, the obtained resultant nonlinear ordinary differential equations were solved numerically using a shooting method for dual solutions of velocity and temperature profiles. Some important physical features of the flow and heat transfer in terms of the fluid velocity, the temperature distribution, the skin friction coefficient and the local Nusselt number for various values of the controlling governing parameters like velocity slip parameter, critical shear rate, magnetic field, ratio of stretching/shrinking rate to external flow rate and Prandtl number were analyzed and discussed. an increase of the critical shear rate decreases the fluid velocity whereas the local Nusselt number increases. The comparison of the present numerical results with the existing literature in a limiting case is given and found to be in an excellent agreement.

Key words:dual solutions; stagnation-point; MHD flow; slip condition; heat transfer; numerical solution; transverse magnetic fields