Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube / Chaobin Dang in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 655-663 Titre : Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube Titre original : Transfert de chaleur lors de l'ébullition du dioxyde de carbone à l'intérieur d'un tube à microailettes de faible diamètre Type de document : texte imprimé Auteurs : Chaobin Dang, Auteur ; Nobori Haraguchi, Auteur ; Eiji Hihara, Auteur Année de publication : 2010 Article en page(s) : pp. 655-663 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat exchanger Tube Microfin Geometry Carbon dioxide Boiling Experiment transfer Pressure drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigated the flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube (mean inner diameter: 2.0 mm; helix angle: 6.3°) at a saturation temperature of 15 °C, and heat and mass flux ranges of 4.5–18 kW m−2 and 360–720 kg m−2 s−1, respectively. Although, experimental results indicated that heat flux has a significant effect on the heat transfer coefficient, the coefficient does not always increase with mass flux, as in the case of conventional refrigerants such as HFCs or HCFCs. Under certain conditions, the heat transfer coefficient at a high mass flux was lower than that at a lower mass flux, indicating that convective heat transfer had a suppression effect on nucleate boiling. The heat transfer coefficients in the microfin tubes were 1.9∼2.3 times the values in smooth tubes of the same diameter under the same experimental conditions, and the dryout quality was much higher, ranging from 0.9 to 0.95. The experimental results indicated that using microfin tubes may considerably increase the overall heat transfer performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000174 [article] Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube = Transfert de chaleur lors de l'ébullition du dioxyde de carbone à l'intérieur d'un tube à microailettes de faible diamètre [texte imprimé] / Chaobin Dang, Auteur ; Nobori Haraguchi, Auteur ; Eiji Hihara, Auteur . - 2010 . - pp. 655-663. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 655-663 Mots-clés : Heat exchanger Tube Microfin Geometry Carbon dioxide Boiling Experiment transfer Pressure drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigated the flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube (mean inner diameter: 2.0 mm; helix angle: 6.3°) at a saturation temperature of 15 °C, and heat and mass flux ranges of 4.5–18 kW m−2 and 360–720 kg m−2 s−1, respectively. Although, experimental results indicated that heat flux has a significant effect on the heat transfer coefficient, the coefficient does not always increase with mass flux, as in the case of conventional refrigerants such as HFCs or HCFCs. Under certain conditions, the heat transfer coefficient at a high mass flux was lower than that at a lower mass flux, indicating that convective heat transfer had a suppression effect on nucleate boiling. The heat transfer coefficients in the microfin tubes were 1.9∼2.3 times the values in smooth tubes of the same diameter under the same experimental conditions, and the dryout quality was much higher, ranging from 0.9 to 0.95. The experimental results indicated that using microfin tubes may considerably increase the overall heat transfer performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000174

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