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International Heat Transfer Conference 9

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ENHANCEMENT OF POOL BOILING HEAT TRANSFER BY STATIC ELECTRIC FIELD

Mitsuhiro Uemura
Institute of Industrial Science, University of Tokyo 7-22-1, Roppongi, Minato-ku, Tokyo 106, Japan

Shigefumi Nishio
Key Laboratory of Enhanced Heat Transfe and Energy Conservation, Ministry of Education, School of Chemical and Energy Engineering, South China University of Technology, China; and Institute of Industrial Science and Technology, University of Tokyo, Japan

Ichiro Tanasawa
Institute of Industrial Science, University of Tokyo Tokyo, Japan

Abstract

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.

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