Heat and mass transfer analysis of chemically reacted Cu/Al ₂ O ₃ Casson hybrid nanofluid flow via porous medium under MHD and slip conditions

Significant research interest in hybrid nanofluids stems from their extensive applications in areas like industrial cooling and biomedical engineering. The present investigation focuses on a hybrid Casson nanofluid, a non-Newtonian fluid with superior thermal conductivity. The study models its flow as it is propelled by a linearly stretching elastic sheet within a Darcy-law porous medium. The study mixed copper (Cu) and aluminum oxide (Al 2 O 3 ) nanoparticles to leverage the high thermal conductivity of metals (copper) and the chemical stability of non-metals (aluminum oxide), improving heat transfer. Further, the impact of chemical interactions within the system and the presence of a magnetic field were also factored into this work. Not only this, but slip velocity phenomenon through the model was also taken into consideration. Dimensionless and similarity variables convert the model from its initial form into ODEs, and the shooting technique integrated with a fourth-order Runge–Kutta numerical scheme provides the computational solution. The findings reveal that stronger magnetic fields and higher porosity parameters significantly boost both heat transfer rate and skin friction, while larger slip parameters and Casson fluid characteristics lead to their reduction. Moreover, intensified chemical reactions decrease the nanoparticle concentration in the flow field. These outcomes, validated through comparison with prior studies, demonstrate a novel contribution by highlighting the dual role of magnetic fields and porosity in simultaneously enhancing heat transport and momentum transfer in hybrid Casson nanofluids.