Billiet Marijn, De Schampheleire Sven, Huisseune Henk, De Paepe Michel
Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, Ghent 9000, Belgium.
Materials (Basel). 2015 Oct 9;8(10):6792-6805. doi: 10.3390/ma8105340.
Two differently-produced open-cell aluminum foams were compared to a commercially available finned heat sink. Further, an aluminum plate and block were tested as a reference. All heat sinks have the same base plate dimensions of four by six inches. The first foam was made by investment casting of a polyurethane preform and has a porosity of 0.946 and a pore density of 10 pores per linear inch. The second foam is manufactured by casting over a solvable core and has a porosity of 0.85 and a pore density of 2.5 pores per linear inch. The effects of orientation and radiative heat transfer are experimentally investigated. The heat sinks are tested in a vertical and horizontal orientation. The effect of radiative heat transfer is investigated by comparing a painted/anodized heat sink with an untreated one. The heat flux through the heat sink for a certain temperature difference between the environment and the heat sink's base plate is used as the performance indicator. For temperature differences larger than 30 °C, the finned heat sink outperforms the in-house-made aluminum foam heat sink on average by 17%. Furthermore, the in-house-made aluminum foam dissipates on average 12% less heat than the other aluminum foam for a temperature difference larger than 40 °C. By painting/anodizing the heat sinks, the heat transfer rate increased on average by 10% to 50%. Finally, the thermal performance of the horizontal in-house-made aluminum foam heat sink is up to 18% larger than the one of the vertical aluminum foam heat sink.
将两种不同生产工艺制造的开孔泡沫铝与一种市售的翅片式散热器进行了比较。此外，还测试了一块铝板和铝块作为参考。所有散热器的底板尺寸均为4×6英寸。第一种泡沫铝是通过对聚氨酯预制件进行熔模铸造制成的，孔隙率为0.946，每线性英寸的孔密度为10个孔。第二种泡沫铝是通过在可溶解型芯上铸造制成的，孔隙率为0.85，每线性英寸的孔密度为2.5个孔。通过实验研究了方向和辐射传热的影响。散热器在垂直和水平方向上进行了测试。通过比较涂漆/阳极氧化的散热器和未处理的散热器来研究辐射传热的影响。以环境与散热器底板之间一定温差下通过散热器的热通量作为性能指标。对于大于30°C的温差，翅片式散热器的性能平均比自制泡沫铝散热器高出17%。此外，对于大于40°C的温差，自制泡沫铝的散热平均比另一种泡沫铝少12%。通过对散热器进行涂漆/阳极氧化处理，传热速率平均提高了10%至50%。最后，水平放置的自制泡沫铝散热器的热性能比垂直放置的泡沫铝散热器高出18%。
