Numerical Investigation of Ohmic Heating and Activation Energy in Magnetohydrodynamic Maxwell Fluid Flow with Cross-Diffusion

The present work examines the Ohmic heating and energy activation of the magnetohydrodynamic (MHD) flow of a Maxwell fluid over a Riga plate in a porous medium, including Soret and Dufour effects. Similarity transformations reduce the governing equations to ordinary differential form, solved numerically using MATLAB's BVP4C. As evidenced in the results, Ohmic heating increases the thermal energy, whereas energy activation affects the heat and mass transport. Cross-diffusion changes the thermal and solutal boundary layers, and the Lorentz forces applied by the Riga plate change the flow and drag. The interaction effect of electromagnetic field, porosity and fluid elasticity determines velocity, temperature, and concentration, and thus information for optimisation of heat and mass transfer in porous systems.