Computational analysis of heat transfer in radiative MHD Reiner–Rivlin nanofluid with slip

This study investigates the heat and mass transfer behavior of a stratified magnetohydrodynamic (MHD) radiative Reiner–Rivlin nanofluid flow over an expanding surface in the presence of Joule heating, chemical reaction, thermal stratification, Brownian motion, thermophoresis, and slip effects. The governing partial differential equations are transformed into a system of nonlinear ordinary differential equations using similarity transformations and solved numerically via MATLAB bvp5c solver. The results reveal that an increase in the magnetic parameter suppresses fluid velocity while enhancing thermal transport due to the Lorentz force. Brownian motion elevates the temperature distribution but reduces nanoparticle concentration, whereas thermophoresis significantly increases nanoparticle dispersion within the boundary layer. The results indicate that strengthening the magnetic field improves the heat and mass transport rates by nearly 25% in the non-Newtonian fluid case. Thermal and concentration fields are also strongly affected by stratification and slip parameters. The findings provide a comprehensive understanding of coupled transport phenomena in non-Newtonian nanofluids and offer valuable insights for advanced thermal management systems, microelectronic cooling devices, and MHD-based heat transfer technologies.