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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

DROPWISE CONDENSATION HEAT TRANSFER OF STEAM UNDER SMALL SURFACE SUBCOOLING

Get access (open in a dialog) DOI: 10.1615/IHTC8.110
pages 1665-1669

要約

Dropwise condensation of steam at atmospheric pressure was investigated within a range of surface subcooling between 0.03 K and 2 K.
A thin film of nickel for resistance thermometry was formed on a titanium substrate using a radio-frequency vacuum sputtering technique. The film of nickel was electrically insulated from the titanium substrate with a thin film of trisilicon tetranitride which was also deposited by vacuum sputtering. The temperature of the condensing surface was measured directly by the nickel film sensor with a sufficient accuracy.
As the result of measurement, dropwise condensation of steam at atmospheric pressure under small surface subcooling on the titanium substrate was found to show qualitatively similar characteristics when compared with the results obtained on copper surfaces. However, the heat transfer coefficients obtained in the present experiment were considerably lower. This might possibly suggest that the surface thermal properties affect dropwise condensation heat transfer, at least, under small surface subcooling.