Thermal performance assessment by using a wavy porous obstacle in a circular vented cavity under non-uniform magnetic field during forced convection of hybrid nanofluids

Abstract

In this study, effects of using a wavy porous object on the thermal performance improvement in circular vented cavity are numerically assessed during hybrid nanofluid convection under non-uniform magnetic field. Numerical analysis is conducted for varying values of Reynolds number (Re, between 200 and 1000), Hartmann number (Ha between 0 and 50), magnetic field inclination (γ between 0 and 90) while Darcy number is taken between and . The amplitude is considered between 0 and 0.5 while wave number of the corrugated porous object is taken between 2 and 16. Significant impacts of the porous object parameters and permeability on the flow pattern distribution and thermal performance improvements are obtained. The magnetic field improves the heat transfer for the lower permeability object case at Ha = 10 while the average Nusselt number (Nu) is reduced for the case with higher permeability object case. Average Nu number improvement up to 33.5 is obtained with the imposed non-uniform magnetic field effects. Average Nu variations of 27.3 and 15 are obtained when the corrugation wave number and amplitude are varied. The Constrained Optimization BY Linear Approximations optimization is used to achieve the highest thermal performance of the configurations.