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International Heat Transfer Conference 9

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

LIQUID-SOLID CONTACT AND EFFECTS OF SURFACE ROUGHNESS AND WETTABILITY IN FILM AND TRANSITION BOILING ON A HORIZONTAL LARGE SURFACE

Masahiro Shoji
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Larry C. Witte
Heat Transfer and Phase Change Laboratory, Department of Mechanical Engineering, University of Houston Houston, TX 77204-4792

Sadao Yokoya
The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113, Japan

Masaichi Ohshima
The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113, Japan

DOI: 10.1615/IHTC9.230
pages 135-140

Abstract

To get insight into the mechanism of transition and film boiling heat transfer, experiments of saturated pool boiling of water on a horizontal copper surface , 100 mm in diameter, are made at atmospheric pressure for four different surface roughness levels and for contact angle levels from 27° to 80° ,with special attention to liquid-solid contact. In general, data show that increased roughness or contact angle decreases the heat flux in transition boiling. Such influence of contact angle carries over to the stage of minimum heat flux and film boiling where liquid-solid contact is possible. It is also found that stable film boiling can exist at lower surface temperatures when the contact angle becomes large. The area fraction of the heat transfer surface wetted by water is measured by an electric probe as well as a micro thermocouple, and the measured values are compared with the value predicted from the boiling curve by Kalinin's hypothesis about transition boiling heat transfer.

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