Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 55, Issue 21-22, Pages 6142-6151Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2012.06.033
Keywords
Open-cell aluminum foam; Cutting; Deformation; Macroscopic surface roughness; Contact surface area
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Funding
- Institute for the Promotion of Innovation by Science and Technology (IWT Vlaanderen) [IWT-090273]
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The application of open-cell aluminum foam often involves a cutting operation to the desired shape and dimensions. Depending on the applied cutting method, this operation can result in a significantly different contact surface area between the foam and a substrate, and a substantial plastic deformation of the struts near the cutting plane. Both are characterised for four cutting methods: circular saw, band saw, sawing wire and electron discharge machining. The first two methods result in a significant local compression. No compression is observed with the other two methods. However, the eroding nature of electron discharge machining results in blunt strut-ends which minimise the contact surface area. The highest contact surface area is obtained with a sawing wire cut. The thermal contact resistance is deduced from experimental data obtained from a press-fit bonding with 0.5 MPa pressure between foam and substrate. Data analysis is done via a conventional zeroth-order thermal resistance model. The highest thermal contact resistance is found for a sample cut with a circular saw. Cutting with band saw reduces this with 25%, electron discharge machining yields a reduction of 36% and sawing wire results in 64% reduction of the press-fit thermal contact resistance. (C) 2012 Elsevier Ltd. All rights reserved.
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