![]() is the activation energy and is the Boltzmann constant which is the physical constant relating energy at the individual particle level with temperature observed at the collective or bulk level. ![]() Where is the rate constant of chemical reaction and is the preexponential factor, simply prefactor (constant), is based on the fact that increasing the temperature frequently causes a marked increase in the rate of reactions. The Arrhenius law is usually of the following form : In free convection boundary layer flows with simultaneous heat mass transfer, one important criterion that is generally not encountered is the species chemical reactions with finite Arrhenius activation energy. The results of the numerical solution are then presented graphically as well as the tabular form for difference values of the various parameters. The governing partial differential equations are reduced to ordinary differential equations by introducing local similarity transformation (Maleque (2010)) and then are solved numerically by shooting method using the Nachtsheim-Swigert iteration technique. The chemical reaction rate in the function of temperature is also considered. The plate is moving with uniform velocity. ![]() We study an unsteady MHD free convection heat and mass transfer boundary layer incompressible fluid flow past a vertical porous plate in the presence of viscous dissipation, heat generation/absorption, chemical reaction, and Arrhenius activation energy.
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