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Experimental study on R-600a boiling in 2.6 mm tube / J. B. Copetti in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 325–334 Titre : Experimental study on R-600a boiling in 2.6 mm tube Titre original : Etude expérimentale sur l'ébullition de R-600a à l'intérieur d'un tube d'un diamètre de 2.6 mm Type de document : texte imprimé Auteurs : J. B. Copetti, Auteur ; M. H. Macagnan, Auteur ; F. Zinani, Auteur Année de publication : 2013 Article en page(s) : pp. 325–334 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Boiling;  Mini-channels;  R-600a;  Frictional  pressure  drop;  Heat  transfer  coefficient Résumé : Boiling heat transfer of R-600a in a 2.6 mm ID tube was investigated. Experimental conditions comprised heat fluxes of 44–95 kW m−2, mass velocities of 240 and 440 kg m−2 s−1 and saturation temperature of 22 °C. The effect of heat flux on the heat transfer coefficient was significant at low vapor qualities for the lower mass velocity. Frictional pressure drops increased with vapor quality and mass velocity. In comparison with R-134a, R-600a provides higher heat transfer coefficients and pressure drops. For the prediction of the heat transfer coefficients, the correlation of Kandlikar and Balasubramanian (2004) best fitted the experimental results, through the adjustment of a model coefficient. For frictional pressure drops, deviations from results obtained by usual correlations were quite large. The present results extend the ranges of heat flux and mass velocity beyond those available in the literature for R-600a, and thus represent a substantial contribution to the theme. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002320 [article] Experimental study on R-600a boiling in 2.6 mm tube = Etude expérimentale sur l'ébullition de R-600a à l'intérieur d'un tube d'un diamètre de 2.6 mm [texte imprimé] / J. B. Copetti, Auteur ; M. H. Macagnan, Auteur ; F. Zinani, Auteur . - 2013 . - pp. 325–334. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 325–334 Mots-clés : Boiling;  Mini-channels;  R-600a;  Frictional  pressure  drop;  Heat  transfer  coefficient Résumé : Boiling heat transfer of R-600a in a 2.6 mm ID tube was investigated. Experimental conditions comprised heat fluxes of 44–95 kW m−2, mass velocities of 240 and 440 kg m−2 s−1 and saturation temperature of 22 °C. The effect of heat flux on the heat transfer coefficient was significant at low vapor qualities for the lower mass velocity. Frictional pressure drops increased with vapor quality and mass velocity. In comparison with R-134a, R-600a provides higher heat transfer coefficients and pressure drops. For the prediction of the heat transfer coefficients, the correlation of Kandlikar and Balasubramanian (2004) best fitted the experimental results, through the adjustment of a model coefficient. For frictional pressure drops, deviations from results obtained by usual correlations were quite large. The present results extend the ranges of heat flux and mass velocity beyond those available in the literature for R-600a, and thus represent a substantial contribution to the theme. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002320