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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

Heat Transfer Performance of a Channel Flow with Aluminum Fiber Layers (Comparison with Aluminum Porous Foams)

Get access (open in a dialog) DOI: 10.1615/IHTC15.hte.009080
pages 4119-4129

Resumo

Heat transfer performance of a channel flow with aluminum fiber layers (AFLs) has been examined for comparison with the plain channel flow. Samples of AFLs treated were composed of aluminum fibers of 100 micron meters in diameter, once arranged as a non-woven fabric and filled inside the channel contacting to a heat transfer wall with porosity of around 82%. Two types of fiber axes orientations were tested, mainly parallel and perpendicular to the heat transfer wall, respectively. As one of the competitive insertion devices to enhance the wall heat transfer, aluminum foams having three different pore numbers, 10, 20 and 40 nominal PPI (pores per inch) with porosity of around 82-83% were also examined. It was found that the heat transfer performance of AFLs changes significantly depending on anisotropy of the fibers orientation. AFLs with their fiber axes mainly parallel to the heat transfer wall achieves eight times higher heat transfer coefficient than no-insertion channel. In contrast, significant heat transfer enhancement, twenty times higher value than that of no-insertion case, is obtained by AFLs with their axes perpendicular to the heat transfer wall. Aluminum foams produce about five times higher heat transfer than that of no-insertion channel which is lower than that of AFLs with their fiber axes parallel to the heat transfer wall. Heat transfer coefficients of both AFLs and aluminum foams have linear relation to the pumping power. AFLs with their axes perpendicular to the heat transfer wall show the largest heat transfer performance treated in the present study.