Heat transfer in porous materials

Results from an experimental investigation of the heat transfer process in porous materials and the effects of high-frequency oscillations from the flow of the heat transfer agent on the process are presented. The similarity of heat transfer in porous materials and in spherical particle layers is determined, based on previous investigations. The effect of the time-averaged oscillatory Reynolds number on the maximum and minimum heat transfer intensity is shown to be linear. In the Reynolds number ranges of 0.125-0.4 and 0.75-0.925, the heat transfer is shown to decrease, while in the range 0.4-0.75, the heat transfer increases; the maximum intensity of heat transfer is realized at a Reynolds number of 0.525. The experimental data on the heat transfer of an oscillating coolant flowing in the porous materials are correlated, and experimental results on the steady-state heat transfer at the inlet boundary of a porous sample are presented.