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Evaporation heat transfer and pressure drop of R-410A in flattened smooth tubes having different aspect ratios / Nae-Hyun Kim 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. 363–374 Titre : Evaporation heat transfer and pressure drop of R-410A in flattened smooth tubes having different aspect ratios Titre original : Transfert de chaleur et chute de pression lors de l'évaporation du R-410A à l'intérieur de tubes lisses aplatis avec différents rapports longueur-diamètre Type de document : texte imprimé Auteurs : Nae-Hyun Kim, Auteur ; Eul-Jong Lee, Auteur ; Ho-Won Byun, Auteur Année de publication : 2013 Article en page(s) : pp. 363–374 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Evaporation;  Heat  transfer  coefficient;  Pressure  drop;  Tube;  R-410A Résumé : In this study, evaporation heat transfer coefficients and pressure drops of R-410A were obtained in flat tubes. Flat tubes were made by progressively deforming 5.0 mm I.D. round tube. The test range covered mass flux 200–400 kg m−2 s−1, heat flux from 5 to 15 kW m−2 and saturation temperature from 10 to 15 °C. Results show that both evaporation heat transfer coefficients and pressure drops increased as aspect ratio increased, and were reasonably predicted by appropriate round tube correlations. It is shown that usage of equivalent diameter than hydraulic diameter yields better prediction of heat transfer coefficient. For pressure drop, however, the success is dependent on the correlation. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002472 [article] Evaporation heat transfer and pressure drop of R-410A in flattened smooth tubes having different aspect ratios = Transfert de chaleur et chute de pression lors de l'évaporation du R-410A à l'intérieur de tubes lisses aplatis avec différents rapports longueur-diamètre [texte imprimé] / Nae-Hyun Kim, Auteur ; Eul-Jong Lee, Auteur ; Ho-Won Byun, Auteur . - 2013 . - pp. 363–374. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 363–374 Mots-clés : Evaporation;  Heat  transfer  coefficient;  Pressure  drop;  Tube;  R-410A Résumé : In this study, evaporation heat transfer coefficients and pressure drops of R-410A were obtained in flat tubes. Flat tubes were made by progressively deforming 5.0 mm I.D. round tube. The test range covered mass flux 200–400 kg m−2 s−1, heat flux from 5 to 15 kW m−2 and saturation temperature from 10 to 15 °C. Results show that both evaporation heat transfer coefficients and pressure drops increased as aspect ratio increased, and were reasonably predicted by appropriate round tube correlations. It is shown that usage of equivalent diameter than hydraulic diameter yields better prediction of heat transfer coefficient. For pressure drop, however, the success is dependent on the correlation. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002472