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Transfert de chaleur lors de l'écoulement en ébullition sous-refroidie à partir de surfaces microporeuses dans un microcanal.

Subcooled flow boiling heat transfer from microporous surfaces in a small channel.

Auteurs : SUN Y., ZHANG L., XU H., et al.

Type d'article : Article

Résumé

The continuously increasing requirement for high heat transfer rate in a compact space can be met by combining the small channel/microchannel and heat transfer enhancement methods during fluid subcooled flow boiling. In this paper, the sintered microporous coating, as an efficient means of enhancing nucleate boiling, was applied to a horizontal, rectangular small channel. Water flow boiling heat transfer characteristics from the small channel with/without the microporous coating were experimentally investigated. The small channel, even without the coating, presented flow boiling heat transfer enhancement at low vapor quality due to size effects of the channel. This enhancement was also verified by underpredictions from macroscale correlations. In addition to the enhancement from the channel size, all six microporous coatings with various structural parameters were found to further enhance nucleate boiling significantly. Effects of the coating structural parameters, fluid mass flux and inlet subcooling were also investigated to identify the optimum condition for heat transfer enhancement. Under the optimum condition, the microporous coating could produce the heat transfer coefficients 2.7 times the smooth surface value in subcooled flow boiling and 3 times in saturated flow boiling. The combination of the microporous coating and small channel led to excellent heat transfer performance, and therefore was deemed to have promising application prospects in many areas such as air conditioning, chip cooling, refrigeration systems, and many others involving compact heat exchangers. [Reprinted with permission from Elsevier. Copyright, 2011].

Détails

  • Titre original : Subcooled flow boiling heat transfer from microporous surfaces in a small channel.
  • Identifiant de la fiche : 30003669
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 50 - n. 6
  • Date d'édition : 06/2011
  • DOI : http://dx.doi.org/10.1016/j.ijthermalsci.2011.01.019

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