The effective thermal properties of solid foam beds: Experimental and estimated temperature profiles

作者：Edouard David^*; Huu Tri Truong; Huu Cuong Pham; Luck Francis; Schweich Daniel

来源：International Journal of Heat and Mass Transfer, 2010, 53(19-20): 3807-3816.

DOI：10.1016/j.ijheatmasstransfer.2010.04.033

• Solid foam
• Pseudo-homogeneous model
• Thermal conductivity
• Heat transfer

The effective radial heat conductivity of a solid foam packing and the wall heat transfer coefficient are determined under fluid flow conditions typical of catalytic reactors. A detailed 2-D heterogeneous model is phase-averaged in order to rigorously define lumped heat transfer parameters. The resulting pseudo-homogeneous model involves two fitting parameters only and it is successfully compared with experiments. First, experiments with packed extrudates validate the approach in comparison with known results. A second experiment with solid foams (polyurethane and SiC) allows correlating the radial heat conductivity to the nature of the solid, its morphology and fluid flow characteristics. The method is inspired from the correlations for particles and seems very promising. Conversely, determining the wall heat transfer coefficient yields only an average value (110W m(-2) K-1 +/- 15%) and correlation with fluid velocity is impossible in the studied range 0.018-0.32 m s(-1).

• 出版日期2010-9