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Materials 2015, 8(10), 6792-6805; doi:10.3390/ma8105340

Influence of Orientation and Radiative Heat Transfer on Aluminum Foams in Buoyancy-Induced Convection

Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, Ghent 9000, Belgium
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Academic Editor: Dirk Lehmhus
Received: 30 July 2015 / Revised: 21 September 2015 / Accepted: 23 September 2015 / Published: 9 October 2015
(This article belongs to the Special Issue Metal Foams: Synthesis, Characterization and Applications)
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Abstract

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. View Full-Text
Keywords: experimental; heat sink; natural convection; metal foam; finned heat sink; radiation; heat transfer experimental; heat sink; natural convection; metal foam; finned heat sink; radiation; heat transfer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Billiet, M.; De Schampheleire, S.; Huisseune, H.; De Paepe, M. Influence of Orientation and Radiative Heat Transfer on Aluminum Foams in Buoyancy-Induced Convection. Materials 2015, 8, 6792-6805.

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