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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

NUMERICAL AND EXACT MATHEMATICAL ANALYSES OF TWO-DIMENSIONAL RECTANGULAR COMPOSITE FINS

Get access (open in a dialog) DOI: 10.1615/IHTC8.3510
pages 367-372

Résumé

Finite differences, finite element and exact mathematical analyses of a composite fin have been made with special reference to the two-dimensional and variable heat transfer coefficient effects on heat transfer from the fin. In particular, a high conductivity rectangular profile fin with a uniformly thick low conductivity layer of specified dimensions and properties has been studied with a view to quantifying these effects on the performance of frosted or fouled heat exchangers. It has been found that the influence of the layer is relatively small, the high conductivity fin proper controlling the heat flow. The reduction of heat transfer due to two-dimensional effects, which are confined principally to the layer, is about 8%. The inclusion of a linearly varying heat transfer coefficient results in a total reduction of heat transfer due to both effects, of approximately 11%.