An evaluation of polymer coatings for the promotion of dropwise condensation of steam.
Holden, Kenneth M., II
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Fifteen 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 fluorcpolymer as a major constituent. Of the other six, four were hydrocarbons, one a chlorocarbon and one a silicone. Each coating was applied to four different metal substrates: brass, copper, naval brass, and titanium. while exposed to steam at atmospheric pressure, each coating was visually evaluated for its ability to promote dropwise condensation. Observations were conducted over a period of 4000 hours. Hardness and adhesion tests were performed on selected specimens both before and after exposure. On the basis of sustained performance, six coatings were selected for heat transfer performance evaluation. A separate apparatus was used in which coated copper tubes were mounted horizontally in a test section through which steam flowed vertically downward. Vapor-side heat-transfer coefficients were inferred from overall measurements. Test results indicate that the outside condensing coefficient can be increased by a factor of five to eight through the use of polymer coatings to promote dropwise condensation.
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NPS Report NumberNPS-69-84-003
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