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An experimental study into the evaporation heat transfer and flow characteristics of R-134a refrigerant flowing through corrugated tubes / Suriyan Laohalertdecha in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 280-291 Titre : An experimental study into the evaporation heat transfer and flow characteristics of R-134a refrigerant flowing through corrugated tubes Titre original : Etude expérimentale sur le transfert de chaleur lors de l'évaporation et les caractéristiques d'écoulement du frigorigène R-134a en écoulement à l'intérieur de tubes ondulés Type de document : texte imprimé Auteurs : Suriyan Laohalertdecha, Auteur ; Somchai Wongwises, Auteur Année de publication : 2011 Article en page(s) : pp. 280-291 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Two-phase  flow  Pressure  Temperature  R-134a  Heat  transfer  enhancement  Corrugated  tube Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effects of corrugation pitch on the evaporation of R-134a flowing inside horizontal corrugated tubes are investigated. The test section is a tube-in-tube heat exchanger with refrigerant flowing in the inner tube and hot water flowing in the annulus. Smooth and corrugated tubes having similar inside diameters are used as the inner tube. Three corrugated tubes having a corrugation depth fixed at 1.5 mm and corrugation pitches of 5.08, 6.35 and 8.46 mm are examined. The data obtained from smooth tube are plotted and compared with the flow pattern map established by Censi et al. (2003) and Zurcher et al. (2002). The effects of average vapour quality, equivalent Reynolds number and corrugation pitch are discussed. The maximum ratios of heat transfer enhancement factor to pressure drop penalty factor (Nuc/Nus)/((ΔP/L)c/(ΔP/L)s) is approximately 1.2. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001581 [article] An experimental study into the evaporation heat transfer and flow characteristics of R-134a refrigerant flowing through corrugated tubes = Etude expérimentale sur le transfert de chaleur lors de l'évaporation et les caractéristiques d'écoulement du frigorigène R-134a en écoulement à l'intérieur de tubes ondulés [texte imprimé] / Suriyan Laohalertdecha, Auteur ; Somchai Wongwises, Auteur . - 2011 . - pp. 280-291. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 280-291 Mots-clés : Two-phase  flow  Pressure  Temperature  R-134a  Heat  transfer  enhancement  Corrugated  tube Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effects of corrugation pitch on the evaporation of R-134a flowing inside horizontal corrugated tubes are investigated. The test section is a tube-in-tube heat exchanger with refrigerant flowing in the inner tube and hot water flowing in the annulus. Smooth and corrugated tubes having similar inside diameters are used as the inner tube. Three corrugated tubes having a corrugation depth fixed at 1.5 mm and corrugation pitches of 5.08, 6.35 and 8.46 mm are examined. The data obtained from smooth tube are plotted and compared with the flow pattern map established by Censi et al. (2003) and Zurcher et al. (2002). The effects of average vapour quality, equivalent Reynolds number and corrugation pitch are discussed. The maximum ratios of heat transfer enhancement factor to pressure drop penalty factor (Nuc/Nus)/((ΔP/L)c/(ΔP/L)s) is approximately 1.2. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001581