Rotating Casson nanofluid convection for Au, Ag, CuO and Al2O3 nanoparticles embedded by Darcy-Brinkman porous medium

Abstract

The present study examines convection in a Casson nanofluid layer in a porous media under the effect of Coriolis force using Darcy-Brinkman model. For a variety of metallic and non-metallic nanoparticles, the analysis is conducted by utilizing the linear stability theory, normal mode approach, and one term Galerkin type weighted residual method. When current numerical findings are compared to those that have already been published, good agreements are found for the permitted range of parameters. Blood (Casson fluid) is numerically simulated for porous media using the Mathematica software to make the analysis valuable for practical applications. Top-heavy configuration of nanoparticles is found to lead to a stationary mode of convection. The effect of porous medium, rotation, Casson parameter and nanoparticle parameters is discussed numerically. Interestingly, it is found that though Casson fluids are more stable as compared to regular fluids but Casson parameter itself has a destabilizing effect on the system. The really important and novel result of the study comes out as the fact that Coriolis force can stabilize the gold-nanoparticle-based Casson fluid layer system which is otherwise totally unstable. As far as metallic and non-metallic nanoparticles are concerned; the stability pattern followed by metallic nanofluids is iron-blood>copper-blood>silver-blood>gold-blood and for non-metallic nanofluids is silica-blood> alumina-blood> titanium oxide-blood>copper oxide-blood.