Available online at www.pelagiaresearchlibrary.com Pelagia Research Library Advances in Applied Science Research, 2012, 3 (4):2134-2140 ISSN: 0976-8610 CODEN (USA): AASRFC 2134 Pelagia Research Library Mass transfer effects on mhd flows exponentially accelerated isothermal vertical plate in the presence of chemical reaction through porous media J. Girish Kumar 1 , P. M. Kishore 2 , S. Ramakrishna 3 1 Dept. of Mathematics, Govt. Degree College, Jammalamadugu, Kadapa(Dt), Andhra Pradesh, India 2 Dept. of Mathematics, Narayana Engineering College, Nellore, Andhra Pradesh, India 3 Dept. of Mathematics, S. V. University, Tiruapati, Andhra Pradesh, India _____________________________________________________________________________________________ ABSTRACT A finite difference solution of mass transfer effects on MHD flow of incompressible viscous dissipative fluid past an exponentially accelerated isothermal vertical plate, on taking into account of viscous dissipative heat, under the influence of chemical reaction through porous medium is evaluated. The velocity, temperature and concentration are studied for different parameters such as the magnetic field parameter, Grashof number, mass Grashof number, chemical reaction parameter, Schmidt number, Prandtl number, permeability parameter. The numerical values of Skin-friction are in tabulated. Key words: MHD, chemical reaction, porous medium, viscous dissipation etc. _____________________________________________________________________________________________ INTRODUCTION Simultaneous heat and mass transfer from different geometrics embedded in porous media has many engineering and geophysical applications such as geothermal reservoirs, drying of porous solids, thermal insulation, enhanced oil recovery, packed-bed catalytic reactors, cooling of nuclear reactors, and underground energy transport. In particular, natural convection induced by the simultaneous action of buoyancy forces resulting from thermal and mass diffusion is of considerable interest in nature and in many industrial applications such as geophysics, oceanography, drying processes, solidification of binary alloy and chemical engineering. The present trend in the field of chemical reaction analysis is to give a mathematical model for the system to predict the reactor performance. A large amount of research work has been reported in this field. In particular, the study of heat and mass transfer with chemical reaction is of considerable importance in chemical and hydrometallurgical industries. Chemical reaction can be codified as either heterogeneous or homogeneous process. This depends on whether they occur at an interface or as a single phase volume reaction. One of the simplest chemical reactions is the first order reaction in which the rate of reaction is directly proportional to the species concentration. Muthucumaraswamy [4] studied the effect of a chemical reaction on a moving isothermal vertical surface with suction. Mass transfer effects on isothermal vertical oscillating plate in the presence of chemical reaction were studied by Muthucumaraswamy and Janakiraman [5]. The effects of mass transfer on flow past an impulsively started infinite vertical plate with chemical reaction were studied by Das et al. [2]. Anjali Devi and Kandasamy [1] studied the steady laminar flow along a semi-infinite horizontal plate in the presence of species concentration and chemical reaction. Mass transfer effect on exponentially accelerated isothermal vertical plate was discussed by Muthucumaraswamy et al. [6]. Radiation and mass transfer effects on MHD free convection flow past an exponentially accelerated vertical plate with variable temperature was studied by Rajesh and Vijaya Kumar Varma [7]. Radiation and chemical reaction effects on an