1Department of Physics, Jatani College, Jatani Khurda India

2Department of Physics, Nayagarh Autonomous College, Nayagarh India

³Plot No 193, Jayadeva Vihar, Bhubaneswar India

Email:-dr.sadasivabiswal@ymail.com

 Effects of heat and mass transfer on MHD free convection, flow of a visco-elastico (Walters' ) fluid past an exponentially accelerated vertical porous plate have been studied. The problem is formulated with the development of the constitutive equations of continuity, momentum, energy and concentration. Solving the equations by Laplace transform technique, expressions for velocity, temperature and concentration are obtained. With the numerical values of the fluid parameters, computation is preformed and necessary graphs and tables are drawn to unveil the characteristics of velocity field, temperature field and concentration. Then expressions for shear stresses, rate of heat transfer and concentration gradient are obtained. It is observed that the velocity of flow increases with the distance from the plate for an externally cooled plate (G>0) and a reverse effect is marked for an externally heated plate (G<0). The temperature and concentration decreases with the increase of Prandtl number (P) and Schmidt number (S_c) respectively.