Buoyancy driven convection in open-cell metal foam using the volume averaging theory

Schampheleire, Sven De; Kerpel, Kathleen De; Jaeger, Peter De; Huisseune, Henk; Ameel, Bernd; Paepe, Michel De

doi:10.1016/j.applthermaleng.2015.01.019

Cited by 19 publications

(12 citation statements)

References 28 publications

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“…This explains why the metal foam, even though having a larger surface-to-volume ratio (see Table 1 ), has a smaller thermal performance than the finned heat sink. This shallow penetration by the air in the metal foam was also reported by De Schampheleire et al [ 22 ], who performed numerical simulations. Moreover, a higher temperature difference induces a larger buoyancy force, but the air flow rate through the metal foam will increase less than the one of the finned heat sink, due to its higher hydraulic resistance.…”

Section: Resultssupporting

confidence: 84%

“…In contrast, the relative contribution of thermal radiation to the total heat transfer increases with increasing height for the solid aluminum block. According to De Schampheleire et al [ 22 ], the highest aluminum foam has the largest influence by radiation. This conclusion is the opposite of the one found here.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, De Schampheleire et al . [ 21 , 22 ] investigated the influences of porosity, pore size, foam height and radiative heat transfer on the thermal performance of aluminum foam heat sinks in buoyancy-induced convection, both numerically and experimentally. Based on these results published in the open literature, the following conclusions can be drawn: The heat transfer of highly-porous metal foam in buoyancy-induced convection increases with decreasing porosity [ 19 , 20 , 21 ]; The heat transfer of highly porous metal foam in buoyancy-induced convection decreases with increasing pore density [ 19 , 20 , 21 ]; The heat dissipated by the metal foam heat sink increases with increasing heat sink height until it reaches an asymptotic value.…”

Section: Introductionmentioning

confidence: 99%

“…The asymptotic value is reached when the effect of the increasing viscous drag and the temperature drop along the heat sink’s height equals the effect of increasing surface area [ 20 , 21 ]; De Schampheleire et al . [ 22 ] indicated the importance of the radiative heat transfer of metal foam heat sinks in buoyancy-driven convection. The authors found that up to 30% of the total heat transfer of aluminum foam heat sinks in buoyancy-induced convection is due to thermal radiation; The experimental data of both Bhattacharya et al [ 19 ] and Qu et al .…”

Section: Introductionmentioning

confidence: 99%

“…De Schampheleire et al . [ 22 ] indicated the importance of the radiative heat transfer of metal foam heat sinks in buoyancy-driven convection. The authors found that up to 30% of the total heat transfer of aluminum foam heat sinks in buoyancy-induced convection is due to thermal radiation;…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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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.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%