Experimental evaluation of spray cooling of R-134a on plain and enhanced surfaces / Augusto G. Ulson de Souza in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 527–533 Titre : Experimental evaluation of spray cooling of R-134a on plain and enhanced surfaces Titre original : Evaluation expérimentale de la brumisation du R-134a sur des surfaces planes et augmentées Type de document : texte imprimé Auteurs : Augusto G. Ulson de Souza, Auteur ; Jader R. Barbosa Jr., Auteur Année de publication : 2013 Article en page(s) : pp. 527–533 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Spray cooling  Boiling  Metal foam  Heat transfer enhancement 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−1 (8.333 × 10−4 kg s−1). The type of surface geometry is not seen to affect significantly the critical heat flux. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003404 [article] Experimental evaluation of spray cooling of R-134a on plain and enhanced surfaces = Evaluation expérimentale de la brumisation du R-134a sur des surfaces planes et augmentées [texte imprimé] / Augusto G. Ulson de Souza, Auteur ; Jader R. Barbosa Jr., Auteur . - 2013 . - pp. 527–533. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 527–533 Mots-clés : Spray cooling  Boiling  Metal foam  Heat transfer enhancement 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−1 (8.333 × 10−4 kg s−1). The type of surface geometry is not seen to affect significantly the critical heat flux. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003404

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