An Investigation of the Effects of a Linear Porosity Distribution on Non-Equilibrium Heat Transfer in High-Conductivity Graphitic Foam

Abstract

The fluid flow and heat transfer in a block of high-conductivity, graphitized carbon foam placed in a sealed channel in the presence of a variety of porosity gradients transverse to the primary direction of flow are presented. Such considerations are vital for this material, as the current process used to manufacture the foam does not generally yield blocks of uniform porosity. A volume-averaged model, which allows for local thermal nonequilibrium is presented along with its calibration. The results are presented and discussed in light of their relevance to the design of enhanced heat transfer devices based upon graphitized carbon foam.