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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

AN EXPERIMENTAL INVESTIGATION OF POOL BOILING FOR WATER WITH COPPER FOAM METAL AT LOW VACUUM PRESSURE

Get access (open in a dialog) DOI: 10.1615/IHTC13.p28.540
7 pages

Resumo

The pool boiling heat transfer of water has been investigated extensively by many scientists and researchers and the range of pressures of experiments spanning from atmospheric to near critical pressures. There is a dearth of pool boiling data for micro cooling applications particularly when the vapour pressures are less than 4 kPa and saturation temperatures are below the ambient. In this paper, the authors investigate the pool boiling of water in an evaporator where uniform heat fluxes are introduced by a radiantly-heated kaleidoscope, maximizing the high density boiling pattern across a specially designed foam-metal surface. The evaporator pressure is about 1.8 kPa, corresponding to water boiling temperatures of around 16°C. Other factors such as the ratio of wetted surface to base area have also been investigated. The results show that high boiling fluxes could be achieved with substantially lower overall temperature difference between the foam-metal and the saturation temperature. The measured data compared well with the available experimental data found in the literature, and a new modified correlation for pool boiling at low sub-atmospheric pressure is proposed.