Viscous dissipation impact on free convection flow of Cu-water nanofluid in a circular ...

In this work, free convection of Cu-water nanofluid in an enclosure by considering inteally heat generated in the porous circular cavity and the impacts of viscous dissipation are numerically evaluated by control volume finite element method (CVFEM). We maintain the outer and ier sides of the circular porous enclosure at a fixed temperature while insulating the other two walls. We examined the impacts of diverse effective parameters including the Rayleigh number, viscous dissipation, and nanofluid concentration on features of heat transfer and fluid flow. Also, a new correlation for average Nusselt number is developed according to the study’s active parameters. It can be deduced by the results that the maximum value of the temperature is proportional to viscous dissipation parameter.