2-D and 3-D modulated porous coatings for enhanced pool boiling

Min D. H. , Hwang G. S. , Usta Y., Cora O. N. , Koc M., Kaviany M.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, vol.52, pp.2607-2613, 2009 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52
  • Publication Date: 2009
  • Doi Number: 10.1016/j.ijheatmasstransfer.2008.12.018
  • Journal Name: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.2607-2613
  • Keywords: Critical heat flux, Enhanced pool boiling, Modulated porous coating, 2-D and 3-D modulations, Wick superheat

Abstract

A new fabrication method (hot-powder compaction) is developed to readily make 2-D and 3-D modulated coatings for enhanced pool-boiling performance. The modulated coatings are 2-D and 3-D stacks with different height, width, and pitch (modulation wavelength), and made with different particle diameters and porosities. The maximum measured critical heat flux (q(CHF)) of 2-D and 3-D modulated coatings are 3.3 and 2.0 times that of the surface without coatings (plain). As expected from the hydrodynamic stability theory, the experimental results for 2-D coatings are similar to 3-D coatings and show that q(CHF) strongly depends on the modulation wavelength, while particle diameter and porosity have a little effects. The results also suggest that a stack aspect ratio (height to pitch) larger than unity is needed for modulation enhancement of the critical heat flux. (C) 2009 Elsevier Ltd. All rights reserved