Numerical analysis of TiO2–Al2O3/water and Ag–MoS2/water hybrid nanofluid flow over a rotating disk with thermal radiation and Cattaneo–Christov heat flux effects

Abstract

The study of nanofluids using a stretchy disc has lately gained importance in fluid mechanics. This work investigates the impacts of the Cattaneo-Christov model, heat radiation, and melting events on TiO₂–Al₂O₃/water and Ag–MoS₂/water hybrid nanofluids over a disc. The results show that hybrid nanofluids greatly increase the thermal conductivity and heat transfer capabilities of base fluids. Water-based hybrid nanofluids are used in military applications such as solar thermal energy, heating pumps, heat exchanger devices, ships, air cleaners, the automotive industry, electric chillers, nuclear-powered systems, turbines, and equipment. To explain the flow of hybrid nanofluids, the two-dimensional nonlinear governing equations, which include the continuity, momentum, and heat transfer rate equations, are expressed in a non-dimensional form. The bvp4c solver firing technique in MATLAB is used to solve these non-dimensional equations and investigate the physical effects of various parameters on velocity and temperature profiles. Increasing the magnetic parameter and nanoparticle volume fraction substantially affects the velocity profile in opposing flow. Greater values of the thermal radiation and heat source-sink parameters result in a greater temperature profile. In addition, raising the thermal relaxation and melting parameters improves the temperature profile. The study’s findings may be utilized in various sectors, including drainage, chemical engineering, solar panels, solar absorption and filtration, groundwater hydrology, solar cells, and other sheet flow applications.