Endurance and heat - transfer performance of polymer coatings for the promotion of dropwise condensation of steam.
Looney, Daniel J.
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Ten polymer coatings were evaluated for the long term promotion of dropwise condensation of steam. Four of the coatings were experimental coatings developed by the Naval Research Laboratory and six were commercial coatings. Continuous dropwise condensation in excess of 10,000 hours was obtained for several of the coatings that were applied to rough surfaces. Three commercial coatings, in addition to an NRL fluoroacrylic coating, were evaluated for heat-transfer performance. The effects of roughness, substrate thermal conductivity / coating thickness, and vapor velocity on the heat-transfer coefficient were studied for dropwise condensation of steam on a horizontal tube. Dropwise heat-transfer coefficients were also determined for steam condensing on silver-electroplated tubes, in order to compare the results with those from the polymer-coated tubes. Heat-transfer coefficient enhancement factors of as much as 10-12 were obtained for dropwise condensation when compared to filmwise results.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
NPS Report NumberNPS-69-84-015
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Holden, Kenneth M., II (Monterey, California. Naval Postgraduate School, 1984-03); NPS-69-84-003Fifteen polymer coatings were evaluated for their ability to promote and sustain dropwise condensation of steam to enhance the heat transfer capability of steam condensers. Of the fifteen coatings, nine employed a ...
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