Actions for Conditions for dropwise condensation on electroplated gold. Final report, February 15, 1980-August 14, 1983

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Conditions for dropwise condensation on electroplated gold. Final report, February 15, 1980-August 14, 1983

Author
Westwater, J. W.
Published
United States : [publisher not identified], 1983
Springfield, Va.: National Technical Information Service, [approximately 1983]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
This research is concerned with the use of thin coatings of gold, silver, and chromium on metal to produce dropwise condensation of steam. Dropwise condensation is preferred to filmwise condensation, because it has much larger heat transfer coefficients. For example, the use of dropwise condensation in ocean thermal energy conversion could result in dramatic reductions in the size of heat exchangers. Tests have been conducted on numerous gold and silver deposits, with and without brighteners or alloying ingredients, in controlled thicknesses. A critical plating thickness of gold or silver in the order of 100 m is needed to produce dropwise condensation. A thin plate such as 20 nm is not effective. The test surfaces have been analyzed by Auger spectroscopy and examined by electron microscopy. The results indicate that the role of gold or silver is to provide an oxide-free surface for tenacious absorption of some trace organic material. Future work is aimed at identifying the organic species and its source. Preliminary tests show that chromium plating also can produce dropwise condensation. Future work will expand the testing of chromium.
Report Numbers
DE83017892; DOE/ER/10596-3
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC02-80ER10596
OSTI Identifier 5618312
Research organization: Illinois Univ., Urbana (USA). Dept. of Chemical Engineering.
View MARC record | catkey: 47335337