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Indexed by:期刊论文

Date of Publication:2001-02-01

Journal:CHINESE JOURNAL OF CHEMICAL ENGINEERING

Included Journals:Scopus、SCIE、EI、CSCD

Volume:9

Issue:1

Page Number:17-21

ISSN No.:1004-9541

Key Words:dropwise condensation heat transfer; polymer film; temperature fluctuation

Abstract:The plasma polymerization method and dynamic ion-beam mixed implantation method were employed to coat ultra-thin polymer films on copper plates. Experiments indicated that steady dropwise condensation of steam at atmospheric pressure occurred. The condensation heat transfer coefficients increased by approximately 3 and 5-7 times for the polytrimethylvinylsilane film and polytetrafluoroethylene film respectively, compared with the value for film condensation under the same experimental conditions. The temperatures on the condensing surface and inside the test block were found to be rapidly and randomly fluctuated. The properties of the coated films and advantages of the methods used in this investigation were discussed briefly.