Numerical Simulation Of Heat Transfer Characteristics Of Electronic Devices' Radiators Filled With Metal Foam

With the rapid development of the electronic industries, the electronic products develop to high performance, miniaturization and integration. The problems of electronics cooling are becoming increasingly prominent, and this caused close attention by the research institutes at home and abroad. This paper improved the traditional fin electronic devices'radiators by changing the number of radiators'fins and filling the aluminum foam between two fins which using forced air cooling method. And it proposed metal foam-filled radiator for the electronic device. The improved heat sink enhanced its heat transfer performance relying on the special characteristics of metal foam, and the improved radiator's heat transfer efficiency improved significantly.The fin umber of the radiators used in this research is 1, 2, 4, and 6, filling with two different pore density of aluminum foam (20ppi, 5ppi). At 1.0m/s~1.8m/s wind speed range, this paper simulated the effect factors on heat transfer performance of radiators about the velocity, fin pitch, pore density of metal foam and heat flux. And comparative analysis of the heat transfer characteristics with the radiators which are not filled with metal foam.Obtained by numerical simulation, the heat transfer effect increased significantly when the radiator filled with aluminum foam. And its surface heat transfer coefficient is 2.8~4.6 times to the radiator which is not filled with aluminum foam, and the pressure drop increased smaller. For the aluminum foam filled radiator, when the fin number is 4, that is, when the fin pitch is 11.1mm, the radiator's heat transfer coefficient reached the maximum. The results obtained, four-finned radiator filled with aluminum foam has the best integrated effect of heat transfer. Heating power also has a larger influence to the radiator's cooling performance, and it has certain restrictions to improve the thermal performance of heat sink by increasing the velocity. Under the same condition and experimental parameters, compared the results of numerical simulation with the results of experimental, it shows that numerical simulation have the better response to the experimental, and further verifies the reliability of numerical simulation.