The effects of natural convection and radiation heat transfer in metal-foam- fin (Aluminum)

Abstract

The effect of radiation losses on the natural convection heat transfer from metal-foam of convex<br><br>parabolic profile is studied analytically and numerically. Two models, with and without effect of<br><br>radiation, are introduced based on using energy balance and Darcy’s model to formulate the heat<br><br>transfer equation. Air and Aluminum are employed as the cold fluid and porous medium, respectively,<br><br>and the effects of radiation, pore density (PPI), Rayleigh number (Ra) and porosity on the heat transfer<br><br>rate are studied in detail. The results show by increasing PPI and decreasing Ra the heat transfer rate<br><br>decreases as permeability decreases.Furthermore, the effect of porosity on heat transfer without<br><br>radiation is negligible, but the effects of radiation is considerable in rising heat transfer rate.