Comparative analysis on magnetohydrodynamic flow of non-Newtonian hybrid nanofluid over a stretching cylinder: Entropy generation

This research examines the MHD boundary layer phenomenon of Casson and Williamson hybrid nanofluids on a stretching cylindrical surface. In this model we have taken Ethylene Glycol (EG 50%) and Water (H2O 50%) as the base fluid and Cu - Al2O3 as the nanoparticles. There are various theoretical models available presently for illustrating the thermal transfer impact of non-Newtonian liquid flows over a cylinder. Additionally, External magnetic forces are ideal for addressing the fluid's physical properties and controlling the sort of heat and momentum transfer in the system. Taking this into perspective, we investigate the heat transport behaviour of two distinct non-Newtonian MHD fluids when a cylinder is stretched with heat generation, using a new heat flux theory developed by Christov-Cattaneo to explain the heat transport behaviour. The basic PDEs are turned into ODEs by using the correct similarity transformations. The 4th order Runge-Kutta shooting system is used to solve these ODEs. Homotopy perturbation method (HPM) for the nonlinear system is developed for the comparison purpose and more accurate and reliable outcomes is illustrated through graphs and tables. It is observed that the fluid velocity reduces for the higher values of M. Higher values of the heat generation parameter improve the temperature profile. Nusselt number diminishes when developing Brinkman and Eckert number. Thermal relaxation effectively augments the Bejan factor in the flow of Williamson fluid more than it does in the flow of Casson fluid. This type of theoretical study may be used to improve the performance of solar collectors, solar water heating, solar energy, domestic baseboard heaters, industrial heat exchangers and so on.

Automated summary

This research examines the MHD boundary layer phenomenon of Casson and Williamson hybrid nanofluids on a stretching cylindrical surface. It investigates the impact of various parameters on the heat transfer behavior of these fluids and provides useful data for improving the performance of solar collectors and other devices. The study uses theoretical models and numerical calculations to analyze the fluid velocity, temperature distribution, and Nusselt number.