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Microporous Coating by Dual-Stage Electroplating to Enhance Pool Boiling Performance of Saturated R-123 and FC-72

[+] Author Affiliations
Sang M. Kwark, Joo Han Kim

University of Texas at Arlington, Arlington, TX

Seung M. You

University of Texas at Dallas, Richardson, TX

Paper No. IMECE2014-36828, pp. V08BT10A056; 8 pages
doi:10.1115/IMECE2014-36828
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

The present study describes a dual-stage electroplating method developed to construct numerous active nucleation sites on a target surface for the purpose of enhancing the pool boiling heat transfer performance. Electroplating with high current densities (0.17 ∼ 1.2 A/cm2) builds micro-scale copper dendrites and nodules on the base surface (oxygen free copper) and low current density electroplating (fixed, 0.05 A/cm2) follows to achieve the strong bonding strength of the micro-structures, which enable the coating to be robust in terms of corrosion and endurance. Pool boiling experiments show that the electroplated surfaces extend the boiling critical heat flux by 40∼70% for two working fluids tested and augment the boiling heat transfer coefficients by ∼700% and ∼600% in saturated R-123 and FC-72, respectively, at atmospheric pressure over a baseline (plain surface).

Copyright © 2014 by ASME

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