Heat and Mass Transfer Effect of Micropolar Nanofluid Flow over a Horizontal Moving Plate with Non-Uniform Heat Source/Sink

This study investigates the stagnation-point flow and heat transfer in mixed convection of a micropolar fluid over an exponentially expanding vertical sheet, including the effects of buoyancy, magnetic fields, radiation, and viscous dissipation. The governing partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) using similarity transformations and solved with the bvp4c method. The results show that increasing buoyancy, magnetic field, radiation, and viscous dissipation enhance the velocity profile near the surface. Buoyancy suppresses particle rotation, while magnetic fields enhance it, with micropolar fluids reversing this trend under higher radiation. Temperature decreases with stronger magnetic fields and buoyancy, indicating improved heat dissipation. Differences in fluid behaviour between micropolar and Newtonian fluids highlight the unique characteristics of micropolarity. These findings are relevant for applications such as polymer extrusion, thin-film manufacturing, microfluidic devices, lubrication systems, and cooling technologies, where precise control of flow and heat transfer is essential.