Experimental and Analytical Study on Enhancement of Simultaneous Radiative and Convective Heat Transfer by Porous Bodies with High Porosity

Abstract

An experimental and analytical study has been performed to clarify the effect of porous bodies on heat transfer at high temperatures. It is found that placing porous bodies in a duct, prominent heat transfer enhancement is attained due to both the absorption of intensive thermal radiation from the heating wall and the promotion of convective heat transfer by porous bodies and that radiation effect is notably appeared in the porous bodies with high permeability. On the other hand, analytical model developed here is successfully applied to predict the effect of radiation on heat transfer and the excellent agreements between the theory and the experiment are obtained.