Boiling heat transfer is applied in a large variety of industrial processes and domestic appliances. An improvement in their performance can therefore lead to large energy savings. In the development of improved evaporation heat transfer surfaces on covered surfaces, a passive technique is explored. This technique consists in putting in front of the heating surface by another non-heated surface. The space created is called confined space. The application is widely used in the cooling microelectronics and compact heat exchangers. Local and mean pool boiling heat transfer on covered and roughed surface is experimentally observed for saturated distilled water at atmospheric pressure. The rectangular heating and covering surfaces create a confined space. Various parameters are investigated such as gap sizes, peripheral conditions, and heating surface orientations. 'Slug' flow is observed for 1 mm gap sizes and bubbly flow for larger gaps.
Enhanced boiling heat transfer in very confined channels
Verbesserte Wärmeübertragung durch Verdampfung in extrem engen Kanälen
1993
11 Seiten, 9 Bilder, 10 Quellen
Conference paper
English
Enhanced Boiling Heat Transfer in Very Confined Channels
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