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Evaluation expérimentale de la brumisation du R134a sur des surfaces planes et augmentées.

Experimental evaluation of spray cooling of R134a on plain and enhanced surfaces.

Auteurs : ULSON DE SOUZA A. G., BARBOSA J. R. Jr

Type d'article : Article, Article de la RIF

Résumé

An experimental assessment of the heat transfer coefficient in spray cooling of plain and enhanced upward-facing surfaces is presented. All surfaces of the heater were thermally insulated apart from the top end, onto which pieces with different surface geometries were attached. Average surface temperatures were obtained from four small thermocouples. Three copper surface geometries were evaluated: a plain surface (reference), a 10-pore-per-inch metal foam (90% porosity), and a surface with six 3-mm high 2-mm wide radial grooves. The surface areas of the latter surfaces were 5.1 and 2.2 times larger than that of the plain surface. Boiling curves are presented for increasing heat flux. A base area heat transfer coefficient enhancement factor of 1.35 is obtained for the copper-foam surface, for a coolant flow rate of 3 kg/h. The type of surface geometry is not seen to affect significantly the critical heat flux.

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Format PDF

Pages : 527-533

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Experimental evaluation of spray cooling of R134a on plain and enhanced surfaces.
  • Identifiant de la fiche : 30007235
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 2
  • Date d'édition : 03/2013

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