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Flow boiling heat transfer and pressure drop of pure HFC-152a in a horizontal mini-channel / M. Hamdar in International journal of refrigeration, Vol. 33 N° 3 (Mai 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 566-577 Titre : Flow boiling heat transfer and pressure drop of pure HFC-152a in a horizontal mini-channel Titre original : Transfert de chaleur lors de l'ébullition en écoulement et chute de pression du HFC-152a pur dans un micro-canal horizontal Type de document : texte imprimé Auteurs : M. Hamdar, Auteur ; A. Zoughaib, Auteur ; D. Clodic, Auteur Année de publication : 2010 Article en page(s) : pp. 566-577 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Micro-channel  Horizontal  tube  Experiment  Heat  transfer  Pressure  drop  Boiling  R-152a Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigates boiling heat transfer and two-phase pressure drop of HFC-152a in a horizontal square mini-channel of 1 mm in diameter. Convection heat fluxes were obtained using an inverse heat transfer method. Tests were performed at a nearly constant system pressure of 600 kPa and under saturated conditions. Local heat transfer coefficients were determined as a function of vapor quality along the length of the test section. Tests were carried out for mass flux ranging from 200 to 600 kg/m2s and for heat flux ranging from 10 to 60 kW/m2. Experimental results were compared to predictive models from the literature for two-phase flow pressure drop and boiling heat transfer. The correlation of Müller-Steinhagen and Heck (1986) was found to give a good agreement for prediction of mini-channel frictional pressure losses. The heat transfer mechanism was found to be dominated by nucleate boiling, and the heat transfer coefficient independent of vapor quality and mass flux. A new correlation for Nusselt number was developed based on the Tran et al. (1996) correlation, which was able to predict the present experimental data with respective average and maximum absolute deviations of 3.7% and 11%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002837 [article] Flow boiling heat transfer and pressure drop of pure HFC-152a in a horizontal mini-channel = Transfert de chaleur lors de l'ébullition en écoulement et chute de pression du HFC-152a pur dans un micro-canal horizontal [texte imprimé] / M. Hamdar, Auteur ; A. Zoughaib, Auteur ; D. Clodic, Auteur . - 2010 . - pp. 566-577. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 566-577 Mots-clés : Heat  exchanger  Micro-channel  Horizontal  tube  Experiment  Heat  transfer  Pressure  drop  Boiling  R-152a Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigates boiling heat transfer and two-phase pressure drop of HFC-152a in a horizontal square mini-channel of 1 mm in diameter. Convection heat fluxes were obtained using an inverse heat transfer method. Tests were performed at a nearly constant system pressure of 600 kPa and under saturated conditions. Local heat transfer coefficients were determined as a function of vapor quality along the length of the test section. Tests were carried out for mass flux ranging from 200 to 600 kg/m2s and for heat flux ranging from 10 to 60 kW/m2. Experimental results were compared to predictive models from the literature for two-phase flow pressure drop and boiling heat transfer. The correlation of Müller-Steinhagen and Heck (1986) was found to give a good agreement for prediction of mini-channel frictional pressure losses. The heat transfer mechanism was found to be dominated by nucleate boiling, and the heat transfer coefficient independent of vapor quality and mass flux. A new correlation for Nusselt number was developed based on the Tran et al. (1996) correlation, which was able to predict the present experimental data with respective average and maximum absolute deviations of 3.7% and 11%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002837