THERMAL RADIATION AND MHD EFFECTS ON ENTROPY GENERATION IN CASSON–WILLIAMSON HYBRID NANOFLUID FLOW OVER A ROTATING DISK

Abstract

This research will focus on the entropy Generation of a magnetohydrodynamic (MHD) flow using Casson Willams hybrid nanofluid under flowing rotating disk with consideration of thermal radiation. It is a combination of three items of interest (i) von Kampankan swirling flow made possible by the rotation of the disk, (ii) hybrid nanofluid suspensions, more conductive of heat and better behaved in heat transfers than classical coolants, and (iii) converged non-Newtonian Casson (yield stress) and Williamson (viscoelastic relaxation). There is a generalization of the analysis of entropy-generation into heat-transfer, fluid-friction and Joule heating through the second law of thermodynamics. The Bejan number is used to a certain degree of distributing something irreversible.

The mathematical model includes Rosseland approximation of thermal diffusion and Lorentz approximation that represents the MHD. Open slows of partial differential equations are simplified using transformations of a like manner into nonlinear ordinary differential equations, which are solved numerically. A parameter study is directional in such a way as to select the influence of the magnetic interaction parameter, the radiation parameter, the Casson parameter and the Williamson parameter. It is found that thermal radiation amplifies the wall heat flux with the reduction of temperature gradients far far disk and changes the distribution of entropy. Stronger MHD effects inhibit radial velocity and enhance Joule dissipation, meaning that the Bejan number is wastier. Reduced Casson parameter decreases shear stresses, decreases viscous entropy, and Williamson viscoelasticity redistribes entropy outside of the wall region.

The paper builds on the current literature on non-Newtonian nanofluids, however, extending the area with a hybrid model, the CassonWilliamson in rotating disk geometry with MHD and radiation. The results give an understanding on minimization of irreversibility in rotating machines, biomedical devices, and power systems in advanced working fluids and electro-magnetic control measures are critical.