By electric heating method of metal foam

temperature distribution of R32 and porous fibre were measured and the heat transfer coefficients between them were obtained in metallic foam filled channels. The experiments were conducted for R32 in a metallic foam filled tube with an internal diameter of 5 mm

the 0.95 porosity and 15

45 PPI pore densities

under the conditions of fluid temperature of 280—325 K

heat flux ranging of 1—18 kW·m-2

and mass flux ranging of 20—200 kg·m-2·s-1. Following conclusions could be summarized from the results of the experiments. The heat transfer coefficients of R32 flowing through porous fibres increased with the increase of Re and pore densities. The deviation between predicted values of heat transfer coefficient based on conventional correlation and experimental data reached to-35%—-67%

that is

the conventional correlation is not suitable to predict the convective heat transfer between the porous fibre and the fluid.