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Experimental studies on the evaporative heat transfer and pressure drop of CO2 and CO2/propane mixtures flowing upward in smooth and micro-fin tubes with outer diameter of 5 mm for an inclination angle of 45° / Jin Min Cho in International journal of refrigeration, Vol. 33 N° 5 (Août 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 922-931 Titre : Experimental studies on the evaporative heat transfer and pressure drop of CO2 and CO2/propane mixtures flowing upward in smooth and micro-fin tubes with outer diameter of 5 mm for an inclination angle of 45° Titre original : Etudes expérimentales sur le transfert de chaleur lors de l'évaporation et la chute de pression du CO2 et des mélanges de CO2/propane en écoulement ascendant à l'intérieur de tubes à micro-ailettes avec un diamètre externe de 5 mm et un angle d'inclinaison de 45° Type de document : texte imprimé Auteurs : Jin Min Cho, Auteur ; Yong Jin Kim, Auteur ; Min Soo Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 922-931 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Smooth  tube  Micro-fin  tube  Inclined  tube  Experiment  Heat  transfer  Evaporation  Pressure  drop  Carbon  dioxide  Propane  Mixture Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer characteristics show different tendency according to the tube orientations such as horizontal, vertical, and inclined positions. In this study, evaporative heat transfer characteristics and pressure drop of CO2 and CO2/propane mixtures flowing upward are investigated in inclined smooth and micro-fin tubes. Smooth and micro-fin tubes with outer diameter of 5 mm and length of 1.44 m with inclination angle of 45° were chosen as test tubes. Average inner diameters of test tubes are 4.0 mm (smooth tube) and 4.13 mm (micro-fin tube). The tests were conducted at mass fluxes from 212 to 656 kg/m2 s, saturation temperatures from −10 to 30 °C and heat fluxes from 15 to 60 kW/m2 for CO2. In addition, for CO2/propane mixtures, the test was carried out at inlet temperatures from −10 to 30 °C for several compositions (75/25, 50/50, 25/75 wt%) with the same mass fluxes, heat fluxes applied for CO2. Heat transfer coefficients in inclined tube are approximately 1.8–3 times higher than those in horizontal tube and the average pressure drop of inclined tube exists between that of horizontal and vertical tubes. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000381 [article] Experimental studies on the evaporative heat transfer and pressure drop of CO2 and CO2/propane mixtures flowing upward in smooth and micro-fin tubes with outer diameter of 5 mm for an inclination angle of 45° = Etudes expérimentales sur le transfert de chaleur lors de l'évaporation et la chute de pression du CO2 et des mélanges de CO2/propane en écoulement ascendant à l'intérieur de tubes à micro-ailettes avec un diamètre externe de 5 mm et un angle d'inclinaison de 45° [texte imprimé] / Jin Min Cho, Auteur ; Yong Jin Kim, Auteur ; Min Soo Kim, Auteur . - 2010 . - pp. 922-931. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 922-931 Mots-clés : Heat  exchanger  Smooth  tube  Micro-fin  tube  Inclined  tube  Experiment  Heat  transfer  Evaporation  Pressure  drop  Carbon  dioxide  Propane  Mixture Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer characteristics show different tendency according to the tube orientations such as horizontal, vertical, and inclined positions. In this study, evaporative heat transfer characteristics and pressure drop of CO2 and CO2/propane mixtures flowing upward are investigated in inclined smooth and micro-fin tubes. Smooth and micro-fin tubes with outer diameter of 5 mm and length of 1.44 m with inclination angle of 45° were chosen as test tubes. Average inner diameters of test tubes are 4.0 mm (smooth tube) and 4.13 mm (micro-fin tube). The tests were conducted at mass fluxes from 212 to 656 kg/m2 s, saturation temperatures from −10 to 30 °C and heat fluxes from 15 to 60 kW/m2 for CO2. In addition, for CO2/propane mixtures, the test was carried out at inlet temperatures from −10 to 30 °C for several compositions (75/25, 50/50, 25/75 wt%) with the same mass fluxes, heat fluxes applied for CO2. Heat transfer coefficients in inclined tube are approximately 1.8–3 times higher than those in horizontal tube and the average pressure drop of inclined tube exists between that of horizontal and vertical tubes. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000381