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Boiling 2000 Phenomena and Emerging Applications Volume 2

ISBN 打印: 1-56700-148-3

BOILING HEAT TRANSFER FROM A PTFE COATED HEATING TUBE TO ALCOHOLS

Abstract

This paper discusses an investigation on nucleate pool boiling of alcohols on a 21 µm thick polytetrafluoroethylene (PTFE) coated brass heating tube at atmospheric and subatmospheric pressures. The alcohols are methanol, ethanol and isopropanol. Boiling characteristics on such a surface are compared with those on an uncoated one. Augmentation of boiling heat transfer coefficient due to the coating of PTFE is a function of heat flux and pressure. Data analysis yields a criterion for the augmentation of heat transfer coefficient for the boiling of alcohols on a PTFE coated heating tube.
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