Critical heat flux for downward facing boiling on a coated hemispherical surface

J. Yang, M. B. Dizon, Fan-bill B. Cheung, J. L. Rempe, K. Y. Suh, S. B. Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

An experimental study was performed to investigate the effect of surface coating on the critical heat flux for downward facing boiling on the outer surface of a hemispherical vessel. Steady-state boiling experiments were conducted in the subscale boundary layer boiling (SBLB) facility using test vessels with metallic microporous coatings to obtain the local boiling curves and the local critical heat flux (CHF) limits. Similar heat transfer performance was observed for microporous aluminum and microporous copper coatings. When compared to the corresponding data without coatings, the boiling curves for the coated vessels were found to shift upward and to the right. Hits meant that the CHF limit was higher with surface coating and that the minimum film boiling temperatures were heated at higher wall superheats. In particular, the microporous coatings were found to enhance the local CHF values appreciably at all angular locations explored in the experiments. Results of the present study showed that the microporous aluminum coating was very durable. Even after many cycles of steady state boiling, the vessel coating remained rather intact, with no apparent changes in color or structure. Although similar heat transfer performance was observed for microporous copper coatings, the latter were found to be much less durable and tended to degrade after several cycles of boiling.

Original languageEnglish (US)
Pages (from-to)223-242
Number of pages20
JournalExperimental Heat Transfer
Volume18
Issue number4
DOIs
StatePublished - Oct 1 2005

Fingerprint

boiling
Boiling liquids
Heat flux
heat flux
coatings
Coatings
vessels
heat transfer
film boiling
Aluminum coatings
Heat transfer
aluminum coatings
Copper
copper
cycles
test facilities
curves
Test facilities
boundary layers
Boundary layers

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Yang, J. ; Dizon, M. B. ; Cheung, Fan-bill B. ; Rempe, J. L. ; Suh, K. Y. ; Kim, S. B. / Critical heat flux for downward facing boiling on a coated hemispherical surface. In: Experimental Heat Transfer. 2005 ; Vol. 18, No. 4. pp. 223-242.
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Critical heat flux for downward facing boiling on a coated hemispherical surface. / Yang, J.; Dizon, M. B.; Cheung, Fan-bill B.; Rempe, J. L.; Suh, K. Y.; Kim, S. B.

In: Experimental Heat Transfer, Vol. 18, No. 4, 01.10.2005, p. 223-242.

Research output: Contribution to journalArticle

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