IJMA THERMAL RADIATION AND MASS TRANSFER EFFECTS ON FREE CONVECTION FLOW PAST A SEMI-INFINITE VERTICAL MOVING POROUS PLATE WITH CHEMICAL REACTION T. Sankar Reddy 1 , S. Mohammed Ibrahim 2 and N. Bhaskar Reddy 3 ABSTRACT: The combined free convection boundary layer flow with radiation and mass transfer past a semi-infinite vertical moving porous plate in the presence of chemical reaction is studied when the plate moves in its own plane. The Rosseland approximation is used to describe radiative heat transfer in the limit of optically thick fluids. The dimensionless governing equations for this investigation are solved analytically using two-term harmonic and non-harmonic functions. Numerical evaluation of the analytical results is performed and some graphical results for the results for the velocity, temperature and concentration profiles within the boundary layer and tabulated results for the skin-friction coefficient, Nusselt number and the Sherwood number are presented and discussed. Keywords: Free convection; Radiation; Heat and Mass transfer; Chemical reaction. 1. INTRODUCTION The study of convection with heat and mass is very useful in fields such as chemistry, agriculture and oceanography. A few representative fields of interest in which combined heat and mass transfer play an important role are the design of chemical processing equipment, formation and dispersion of fog, distribution of temperature and moisture over agriculture fields and groves of fruit trees, damage of crops due to freezing, and pollution of the environment. This technique is used in the cooling processes of plastic sheets, polymer fibres, glass materials,