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Effect of inlet configuration on the refrigerant distribution in a parallel flow minichannel heat exchanger / Nae-Hyun Kim in International journal of refrigeration, Vol. 34 N° 5 (Août 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1209-1221 Titre : Effect of inlet configuration on the refrigerant distribution in a parallel flow minichannel heat exchanger Titre original : Impact de la configuration de l'entrée sur la distribution du frigorigéne en écoulement paralléle dans un échangeur de chaleur á microcanaux Type de document : texte imprimé Auteurs : Nae-Hyun Kim, Auteur ; Do-Young Kim, Auteur ; Ho-Won Byun, Auteur Année de publication : 2011 Article en page(s) : pp. 1209-1221 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Micro-channel  Experimentr  Distribution  Refrigerant  Piping-flow Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The refrigerant R-134a flow distribution was experimentally studied for a round header/ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet configurations (parallel, normal, vertical) were investigated. Tests were conducted with downward flow for mass flux from 70 to 130 kg m−2 s−1 and quality from 0.2 to 0.6. Tubes were flush-mounted in the test section, with no protrusion into the header. It is shown that normal and vertical inlet yielded similar flow distribution. As mass flux or quality increased, however, better results were obtained for normal inlet configuration. The flow distribution was worst for the parallel inlet configuration. Possible explanation is provided based on flow visualization results. Correlations were developed to predict the fraction of liquid or gas taken off by downstream channel as a function of header gas Reynolds number at immediate upstream. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001179 [article] Effect of inlet configuration on the refrigerant distribution in a parallel flow minichannel heat exchanger = Impact de la configuration de l'entrée sur la distribution du frigorigéne en écoulement paralléle dans un échangeur de chaleur á microcanaux [texte imprimé] / Nae-Hyun Kim, Auteur ; Do-Young Kim, Auteur ; Ho-Won Byun, Auteur . - 2011 . - pp. 1209-1221. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1209-1221 Mots-clés : Heat  exchanger  Micro-channel  Experimentr  Distribution  Refrigerant  Piping-flow Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The refrigerant R-134a flow distribution was experimentally studied for a round header/ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet configurations (parallel, normal, vertical) were investigated. Tests were conducted with downward flow for mass flux from 70 to 130 kg m−2 s−1 and quality from 0.2 to 0.6. Tubes were flush-mounted in the test section, with no protrusion into the header. It is shown that normal and vertical inlet yielded similar flow distribution. As mass flux or quality increased, however, better results were obtained for normal inlet configuration. The flow distribution was worst for the parallel inlet configuration. Possible explanation is provided based on flow visualization results. Correlations were developed to predict the fraction of liquid or gas taken off by downstream channel as a function of header gas Reynolds number at immediate upstream. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001179