Influence of Thermal Radiation and Chemical Reaction on MHD Mixed Convection Casson Fluid Flow over a Nonlinear Stretching Sheet in a Porous Medium

Abstract

This study investigates the influence of thermal radiation and chemical reaction on magnetohydrodynamic (MHD) mixed convection flow of a Casson fluid over a nonlinear stretching sheet embedded in a porous medium. The non-Newtonian behavior of the Casson fluid, combined with the effects of buoyancy forces, magnetic field, and porous medium resistance, is analyzed under nonlinear stretching conditions. The governing partial differential equations (PDEs) are transformed into a system of nonlinear ordinary differential equations (ODEs) using suitable similarity transformations. The resulting equations are solved numerically using the Runge-Kutta-Fehlberg (RKF) method with shooting technique. The impacts of key parameters such as the Casson fluid parameter, magnetic field strength, thermal radiation, chemical reaction rate, porosity, and nonlinear stretching exponent on velocity, temperature, and concentration profiles are discussed in detail. Additionally, the skin friction coefficient, Nusselt number, and Sherwood number are evaluated to assess the flow dynamics, heat transfer, and mass transfer characteristics. The results reveal that thermal radiation enhances temperature distribution while chemical reaction significantly alters concentration profiles. The findings provide valuable insights for industrial and engineering applications involving non-Newtonian fluid flows, thermal processing, and mass transfer control.