In this study, we have examined the effects of Diffusion thermal and thermal diffusion on MHD mixed convective flow of Maxwell fluid past a porous vertical stretching sheet in the presence of thermal radiation and chemical reaction is investigated. The governing equations of continuity, momentum, and energy are reduced to ordinary differential equation forms by introducing a similarity transformation. Numerical solutions of these equations are obtained by the RungeKutta fourth-order method along with the shooting technique, and the results obtained for different governing flow parameters are drawn graphically, and their effects on velocity, temperature, and concentration profiles are discussed. The values of the skin friction coefficient, Nusselt number coefficient, and Sherwood number coefficient are presented in the table. A comparison with previously reported data is made, and an excellent agreement is noted. The objectives of the present work are to investigate the effect of the Deborah numbers (De), Hartman electric number (Ha), Reynolds number (Rew), and Prandtl number (Pr) on the velocity and temperature fields. As an important outcome, it is observed that increasing the Hartman number reduces the velocity values while increasing the Deborah number has a negligible impact on the velocity increment.

mixed convective flow, Maxwell fluid, nonlinear thermal radiation, porous sheet.