Numerical Investigation of Mixed Convection and Entropy Generation in a Wavy-Walled Cavity Filled with Nanofluid and Involving a Rotating Cylinder

This numerical study considers the mixed convection and the inherent entropy generated in Al water nanofluid filling a cavity containing a rotating conductive cylinder. The vertical walls of the cavity are wavy and are cooled isothermally. The horizontal walls are thermally insulated, except for a heat source segment located at the bottom wall. The dimensionless governing equations subject to the selected boundary conditions are solved numerically using the Galerkin finite-element method. The study is accomplished by inspecting different ranges of the physical and geometrical parameters, namely, the Rayleigh numberangular rotational velocity number of undulations volume fraction of Al2O3 nanoparticles and the length of the heat source The results show that the rotation of the cylinder boosts the rate of heat exchange when the Rayleigh number is less than 5 x 10(5). The number of undulations affects the average Nusselt number for a still cylinder. The rate of heat exchange increases with the volume fraction of the Al2O3 nanoparticles and the length of the heater segment.