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International Journal of Mathematics and Mathematical Sciences
Volume 26 (2001), Issue 4, Pages 249-255
http://dx.doi.org/10.1155/S0161171201010031

Radiation effects on unsteady MHD free convection with Hall current near an infinite vertical porous plate

Department of Mathematics, Faculty of Science, Helwan University, Cairo, Egypt

Received 10 August 1999

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Radiation effect on unsteady free convection flow of an electrically conducting, gray gas near equilibrium in the optically thin limit along an infinite vertical porous plate are investigated in the presence of strong transverse magnetic field imposed perpendicularly to the plate, taking Hall currents into account. A similarly parameter length scale (h), as a function of time and the suction velocity are considered to be inversely proportional to this parameter. Similarity equations are then derived and solved numerically using the shooting method. The numerical values of skin friction and the rate of heat transfer are represented in a table. The effects of radiation parameter, Hall parameter, and magnetic field parameters are discussed and shown graphically.