A series of three-dimensional numerical simulations of Poiseuille-Rayleigh-Benard (P-R-B) convection of cold water with different aspect ratios were carried out by using the finite volume method. The results indicate that the flow weakens gradually as the density inversion parameter increases, indicating that the density inversion parameter has a suppression effect on secondary flow. The average Nusselt number in the fully developed region increases with the increasing Rayleigh number and aspect ratio and the decreasing density inversion parameter. Based on the calculation results, a heat transfer correlation for the fully developed region of P-R-B convection was obtained.
Keywords P-R-B convection, density inversion parameter, aspect ratio, heat transfer