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Condensation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios / E. J. Lee in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 236–249 Titre : Condensation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios Titre original : Transfert de chaleur de condensation et chute de pression dans des tubes à micro-ailettes aplatie avec différents rapports longueur-diamètre Type de document : texte imprimé Auteurs : E. J. Lee, Auteur ; N. H. Kim, Auteur ; H. W. Byun, Auteur Année de publication : 2014 Article en page(s) : pp. 236–249 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Condensation;  Heat  transfer  coefficient;  Pressure  drop;  Microfin;  Tube;  R410A Résumé : In this study, condensation heat transfer coefficients and pressure drops of R-410A are obtained in flattened microfin tubes made from 7.0 mm O.D. round microfin tubes. The test range covers saturation temperature 45 °C, mass flux 100–400 kg m−2 s−1 and quality 0.2–0.8. Results show that the effect of aspect ratio on condensation heat transfer coefficient is dependent on the flow pattern. For annular flow, the heat transfer coefficient increases as aspect ratio increases. For stratified flow, however, the heat transfer coefficient decreases as aspect ratio increases. The pressure drop always increases as aspect ratio increases. Possible reasoning is provided based on the estimated flow pattern in flat microfin tubes. Comparison with existing round microfin tube correlations is made. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002697 [article] Condensation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios = Transfert de chaleur de condensation et chute de pression dans des tubes à micro-ailettes aplatie avec différents rapports longueur-diamètre [texte imprimé] / E. J. Lee, Auteur ; N. H. Kim, Auteur ; H. W. Byun, Auteur . - 2014 . - pp. 236–249. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 236–249 Mots-clés : Condensation;  Heat  transfer  coefficient;  Pressure  drop;  Microfin;  Tube;  R410A Résumé : In this study, condensation heat transfer coefficients and pressure drops of R-410A are obtained in flattened microfin tubes made from 7.0 mm O.D. round microfin tubes. The test range covers saturation temperature 45 °C, mass flux 100–400 kg m−2 s−1 and quality 0.2–0.8. Results show that the effect of aspect ratio on condensation heat transfer coefficient is dependent on the flow pattern. For annular flow, the heat transfer coefficient increases as aspect ratio increases. For stratified flow, however, the heat transfer coefficient decreases as aspect ratio increases. The pressure drop always increases as aspect ratio increases. Possible reasoning is provided based on the estimated flow pattern in flat microfin tubes. Comparison with existing round microfin tube correlations is made. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002697