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

Min D. H., Hwang G. S., USTA Y., Cora O. N., KOÇ M., Kaviany M.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, cilt.52, ss.2607-2613, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.ijheatmasstransfer.2008.12.018
  • Dergi Adı: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2607-2613
  • Anahtar Kelimeler: Critical heat flux, Enhanced pool boiling, Modulated porous coating, 2-D and 3-D modulations, Wick superheat
  • Gazi Üniversitesi Adresli: Evet

Özet

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