Thermal Propagation Effects of Hydromagnetic Micropolar Nanofluid Flow over an Expanding Stagnation-point Surface

The current study investigates the transient stagnation-point flow and heat transfer characteristics of a magneto-micropolar nanofluid over an expanding surface under the influence of thermal radiation and boundary slip. The developed model incorporates the effects of micropolarity with weak concentration, external magnetic fields, and microscopic nanoparticles for enhanced thermal conductivity. The governing partial differential equations are formulated using boundary layer assumptions and transformed into a system of nonlinear ordinary differential equations through appropriate similarity transformations. These equations are solved numerically via shooting and Runge-Kutta Felberg scheme to analyze the effects of key parameters, with results presented in graphical and tabular forms. The findings reveal that increasing the magnetic parameter suppresses the velocity field while enhancing the thermal boundary layer thickness and temperature distribution. Additionally, thermal radiation significantly elevates the fluid temperature, indicating potential applications in thermal management and various energy systems. The results of this study contribute to the optimization of nanofluid-based technologies in transient, high-temperature environments.