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The Effect of Nano-Tailored Surfaces on Steam Condensation

[+] Author Affiliations
S. Vemuri, K. J. Kim, B. D. Wood, S. Govindaraju, T. W. Bell

University of Nevada, Reno, NV

Paper No. IMECE2003-43083, pp. 163-168; 6 pages
doi:10.1115/IMECE2003-43083
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Hydrophobic coatings have been created through self-assembled mono layers (SAMs) on copper alloy (99.9% Cu, 0.1% P) surfaces to enhance steam condensation through dropwise condensation. The use of self-assembled monolayers (SAMs) facilitates the deposition of desirable films that are only as thick as the composite molecules are long. A polished copper alloy surface is oxidized to copper oxide on treatment with the hydrogen peroxide solution and the oxidized copper surface is reduced by the n-octadecyl mercaptan solution to form the ultra thin organic film. Stearic acid solution was also used to form an ultra thin organic film on the surface. In general, a SAM system with a long-chain, hydrophobic group is nano-resistant, meaning that such a system forms a protective hydrophobic layer with negligible heat transfer resistance but a much stronger bond. When compared to complete filmwise condensation, the SAM coating increased the condensation heat transfer rate by a factor of 3 for copper alloy surfaces, under vacuum condition (33.86 kPa). Contact angle measurements are used to pre-determine the condensation mode for the SAM coated surfaces. Lifetime of maintaining dropwise condensation is greatly dependent on the processing conditions.

Copyright © 2003 by ASME
Topics: Condensation , Steam

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