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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Comparison of Aluminium Foam Finned Heat Sinks and Effect of Painting and Orientation in Buoyancy-Driven Convection

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.008865
pages 6617-6626

要約

In this study, two different types of open-cell aluminium foam samples were experimentally tested: pure metal foam fixed to a substrate (a ‘conventional’ foam heat sink) and a finned foam heat sinks (where fins are inserted in the foam to increase the effective thermal conductivity). The substrate and fins are connected to the foam by epoxy glue (k = 0.55 W/mK). 10 PPI (Pores Per linear Inch) AL1050 foam is used with a porosity of 93%. The dimensions of the substrate are the same for all samples: 102x165 mm². Temperatures of the substrate are ranging from 50 to 90°C. Next to studying the thermal performance in horizontal orientation, some samples are also tested vertically. Furthermore, the impact of radiative heat transfer is investigated. The ‘conventional’ foam heat sink performs the best when comparing all foam samples. This because of the increase in flow resistance in case of finned foam heat sinks (and despite the higher effective thermal conductivity). The thermal performance (heat transfer rate) of the ‘conventional’ foam heat sink is up to 15% higher than for the worst preforming finned heat sink with 11 fins. Effects of the inclination angle are found to be significant for the ‘conventional’ foam heat sink (up to 15% in heat transfer rate) and painting the foam heat sinks results in an increase in thermal performance up to 10.8%.