Thermodynamic analysis of entropy generation in MHD hybrid nanofluid channel flow under Navier slip conditions

This study examines the effect of Navier slip on entropy generation in magnetohydrodynamic (MHD) hybrid nanofluid flow through a parallel channel. The analysis considers entropy contributions from heat transfer, fluid friction, and magnetic field interactions. Using the method of lines, velocity, temperature, and entropy generation profiles are computed and analysed. The results reveal that introducing slip at the channel walls significantly reduces total entropy generation, primarily by lowering viscous dissipation in the boundary layers. The hybrid nanofluid, composed of multiple nanoparticles, enhances thermal transport and further decreases thermal irreversibility compared to conventional nanofluids. However, the application of a transverse magnetic field leads to a marked increase in entropy production due to the opposing Lorentz forces, with the effect becoming more pronounced at higher magnetic field intensities. The interplay between slip and magnetic effects creates a trade-off, where moderate slip lengths and optimised nanoparticle composition yield the most thermodynamically efficient flow regime. These insights guide the improvement of the performance of MHD-based thermal systems in applications such as electronic cooling and energy conversion technologies.