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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

ENHANCEMENT OF POOL BOILING HEAT TRANSFER BY STATIC ELECTRIC FIELD

Get access (open in a dialog) DOI: 10.1615/IHTC9.1330
pages 75-80

Аннотация

Enhancement of natural-convection boiling heat transfer by static electric field is investigated experimentally. Boiling of a refrigerant R113 occurs on a flat surface under the atmospheric pressure, and D.C. voltage up to 35kV is applied between the heat transfer surface and an electrode made of stainless steel wire mesh 10mm apart. The boiling curves, which represent the heat flux-surface superheat relationship, are measured under different applied voltages. The orientation of the heat transfer surface can be varied from horizontal facing up to horizontal facing down. The results of experiment indicate that boiling heat transfer is enhanced by electric field. Especially film-boiling heat transfer is enhanced greatly, when the surface faces horizontally downward in particular. Enhancement ratio of film-boiling heat transfer as high as 13 or 14 is obtained. The critical heat flux and the minimum heat flux are both increased with the increasing electric field. As the result, in an electric field of high intensity, the boiling curve becomes to be almost independent of the orientation of the heat transfer surface.