Dissipative disorder optimization in the radiative thin film flow of partially ionized non-Newtonian hybrid nanofluid with second-order slip condition

Abstract The optimization of dissipative disorder in fluid dynamics is a critical aspect of enhancing heat and mass transport efficiency in advanced thermal applications. In this study, we investigate the radiative thin film flow of a partially ionized non-Newtonian hybrid nanofluid (HNF) under the influence of a second-order slip condition. The HNF comprises magnesium oxide (MgO) and zinc oxide (ZnO) nanoparticles (NPs) suspended in water, which enhances its thermophysical properties, including thermal conductivity and heat absorption capacity. HNFs exhibit superior thermal transport capabilities compared to conventional fluids; however, their flow behavior is highly complex, especially in the presence of ionization effects, radiative heat transfer, and interfacial slip dynamics. The second-order slip condition accounts for microscale effects, which are crucial for accurately modeling thin film flows in high-performance cooling and coating applications. The governing equations, incorporating the effects of viscoelasticity, solar radiation, Brownian motion, slip, unsteadiness, and magnetic field interactions, are formulated and solved using collocation weighted residual. The results indicate that incorporating MgO and ZnO NPs into the water base fluid enhances thermal conductivity, leading to improved heat transfer efficiency. The solar radiation parameter significantly increases the fluid temperature, leading to a stronger thermal boundary layer. The findings provide insight into minimizing dissipative losses while enhancing energy transport in industrial and aerospace systems. This study contributes to the advancement of HNF-based technologies by optimizing flow and heat transfer characteristics under complex physical conditions.