MHD Double Diffusive Convection of Al2O3-Water Nanofluid in A Porous Medium Filled an Annular Space Inside Two Vertical Concentric Cylinders with Discrete Heat Flux

The magnetoconvection phenomenon of a double diffusive free convection in an annular porous space inside two concentric cylinders saturated by (Al2O3, water) nanofluid has been investigated the current study. transport equations for vorticity, energy and concentration as well stream function are solved using finite difference method. At lower temperatures concentrations, outer cylinder is sustained, discrete heat flux with unheated adiabatic portions higher concentrations imposed walls central cylinder. base insulated impermeable. In vertical direction, external magnetic field (MF) uniform intensity applied. results obtained numerical simulation presented to exhibit consequences various numbers such: Rayleigh RaTh, Hartmann Ha, Buoyancy forces ratio N solid nanoparticles (NPs) volume fraction  on pattern flow transferred mass thermal active wall. It noted that wall augments RaTh augments. growth , while decreases. greater magnetism declines rate