Analysis of Natural Convection and Radiation Heat Transfer in Porous Fins (Metal-Foam) by Orthogonal Collocation

Analysis of Natural Convection and Radiation Heat Transfer in Porous Fins (Metal-Foam) by Orthogonal Collocation

The effect of radiation losses and the natural convection heat transfer from metal-foam fin of convex parabolic profile is studied in this paper.The CFD Solution(Orthogonal collocation method) is obtained. Two models, with and without effect of radiation, are introduced based on using energy balance and Darcy’s model to formulate the heat transfer equation. Air and Aluminum are employed as the cold fluid and porous medium, respectively, and the effects of radiation, pore density(PPI), Rayleigh number(Ra) and porosity on the heat transfer rate are studied in detail. The results show that, as PPI increases, the heat transfer rate decreases as permeability decreases. As Ra increases the heat transfer rate increases. Furthermore, the effects of porosity on heat transfer in model without effects of radiation is negligible but the effects in model with effects of radiation are significant and significantly increases the heat transfer rate