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Abstract Title of M. D: EFFECT OF CHEMICAL REACTIONS ON HEAT AND MASS TRANSFER FOR BOUNDARY LAYER FLOW THROUGH POROUS MEDIA The main aim of this dissertation, which consists of five chapters, is to study numerical solutions for some problems of heat and mass transfer over different shape surfaces in the boundary layer flow through a porous medium. In the following, a brief discussion of the chapters is given. In chapter one, we have introduced a general introduction to boundary layer flows, flows through porous medium, Darcy’s law, Non-Darcian models, basic equations of porous medium, combined heat and mass transfer and effects of chemical reactions. In chapter two, we introduced numerical solutions for partial differential equations of heat and mass transfer for four boundary conditions over different shape surfaces embedded in porous media and the following three problems have been studied: In the first problem (2.1), an approximate numerical solution for the flow problem has been obtained by solving the governing equations using shooting technique with a fourth-order Runge-Kutta integration scheme. Four different cases of flows have been studied namely an isothermal surface, a uniform heat flux surface, a plane plume and flow generated from a horizontal line energy source a vertical adiabatic surface. Numerical results are presented for the perturbation analysis for the four conditions with various parameters with considering suction or injection flow. The results obtained show that the flow 4 field is influenced appreciably by the presence of chemical reaction, viscous dissipation and suction or injection flow. (This work accepted for publication in International Journal of Applied Mathematics and Mechanics [43]). In the second problem (2.2), an approximate numerical solution for steady boundary-layer flow is presented to study the effects of chemical reactions on magneto-hydrodynamic natural convection flow. Four different cases of flows have been studied namely an isothermal surface, a uniform heat flux, a plane plume and flow generated from a horizontal line energy source a vertical adiabatic surface. Rosseland approximation is used to describe the radiative heat flux in the energy equation. Numerical results are presented for the perturbation analysis for the four boundary conditions with various parameters and analyzing the results. (This work accepted for publication in JP Journal of Heat and Mass Transfer [54]). In the third problem (2.3), the effect of chemical reaction with a regular two-parameter perturbation analysis has been studied for the effects in magnetohydrodynamic free convection flows of Newtonian fluid-saturated porous medium. The Rosseland approximation is used to describe the radiative heat flux in the energy equation. Four different cases of flows have been studied namely an isothermal surface, a uniform heat surface, a plane plume and flow generated from a horizontal line energy source a vertical adiabatic surface. Numerical results are presented for the perturbation analysis for the four boundary conditions are solved numerically by the fourth-order Runge-Kutta integration scheme. A representative set is displayed graphically to illustrate the influences of the parameters on the velocity, temperature and concentration |