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Effect of oil on two-phase pressure drop of refrigerant flow boiling inside circular tubes filled with metal foam / Haitao Hu 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. 516–526 Titre : Effect of oil on two-phase pressure drop of refrigerant flow boiling inside circular tubes filled with metal foam Titre original : Effet de l'huile sur la chute de pression diphasique du frigorigène lors de l'ébullition en écoulement à l'intérieur de tubes circulaires remplis de mousse métallique Type de document : texte imprimé Auteurs : Haitao Hu, Auteur ; Yu Zhu, Auteur ; Shuo Sun, Auteur Année de publication : 2013 Article en page(s) : pp. 516–526 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Correlation;  Flow  boiling;  Metal  foam;  Oil;  Pressure  drop Résumé : Two-phase pressure drop characteristics of refrigerant-oil mixture in circular tubes filled with metal foam were experimentally investigated. Experimental conditions cover nominal oil concentrations from 0% to 5%, metal foam structures of 5 PPI and 10 PPI, vapor qualities from 0.2 to 0.8, and mass fluxes from 30 to 90 kg/m2s. The test results show that the pressure drop increases with the increase of oil concentration, mass flux or vapor quality. The presence of oil increases pressure drop by a maximum of 25% and 50% for 5 PPI and 10 PPI metal foams, respectively. The enhancement effect of oil for high PPI metal foam is more evident than that for low PPI metal foam. A correlation for predicting the two-phase pressure drop of refrigerant-oil mixture in circular metal-foam tubes was developed, and it agrees with 90% of the experimental data within a deviation of ±20%. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002976 [article] Effect of oil on two-phase pressure drop of refrigerant flow boiling inside circular tubes filled with metal foam = Effet de l'huile sur la chute de pression diphasique du frigorigène lors de l'ébullition en écoulement à l'intérieur de tubes circulaires remplis de mousse métallique [texte imprimé] / Haitao Hu, Auteur ; Yu Zhu, Auteur ; Shuo Sun, Auteur . - 2013 . - pp. 516–526. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 516–526 Mots-clés : Correlation;  Flow  boiling;  Metal  foam;  Oil;  Pressure  drop Résumé : Two-phase pressure drop characteristics of refrigerant-oil mixture in circular tubes filled with metal foam were experimentally investigated. Experimental conditions cover nominal oil concentrations from 0% to 5%, metal foam structures of 5 PPI and 10 PPI, vapor qualities from 0.2 to 0.8, and mass fluxes from 30 to 90 kg/m2s. The test results show that the pressure drop increases with the increase of oil concentration, mass flux or vapor quality. The presence of oil increases pressure drop by a maximum of 25% and 50% for 5 PPI and 10 PPI metal foams, respectively. The enhancement effect of oil for high PPI metal foam is more evident than that for low PPI metal foam. A correlation for predicting the two-phase pressure drop of refrigerant-oil mixture in circular metal-foam tubes was developed, and it agrees with 90% of the experimental data within a deviation of ±20%. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002976

Heat transfer measurements and correlation of refrigerant flow boiling in tube filled with copper foam / Yu Zhu in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 215–226 Titre : Heat transfer measurements and correlation of refrigerant flow boiling in tube filled with copper foam Titre original : Mesures du transfert de chaleur et corrélation entre les mesures et l'ébullition en écoulement du frigorigène à l'intérieur d'un tube rempli de mousse de cuivre Type de document : texte imprimé Auteurs : Yu Zhu, Auteur ; Haitao Hu, Auteur ; Shuo Sun, Auteur Année de publication : 2014 Article en page(s) : pp. 215–226 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Metal  foam;  Flow;  Boiling;  Flow  pattern;  Heat  transfer;  Correlation Résumé : Flow boiling heat transfer characteristics of refrigerant in tubes filled with metal foams were experimentally investigated at a saturation temperature of 7 °C, mass flux from 10 to 90 kg m−2 s−1, vapor quality from 0.1 to 0.8 and heat flux from 3.1 to 18.3 kW m−2. The refrigerant is R410A. The test sections are tubes with inner diameter of 23.4 or 13.8 mm, filled with 5 or 10 PPI copper foam. The experimental results reveal that, metal foam enhances the flow boiling heat transfer by a maximum of 220% and promotes the flow pattern transition from stratified flow to stratified-wavy flow and from stratified-wavy flow to annular flow. The heat transfer coefficient decreases with vapor quality under low mass flux, while it increases with vapor quality under high mass flux. A correlation for predicting the flow boiling heat transfer was developed and it agrees well with the experimental data. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001011 [article] Heat transfer measurements and correlation of refrigerant flow boiling in tube filled with copper foam = Mesures du transfert de chaleur et corrélation entre les mesures et l'ébullition en écoulement du frigorigène à l'intérieur d'un tube rempli de mousse de cuivre [texte imprimé] / Yu Zhu, Auteur ; Haitao Hu, Auteur ; Shuo Sun, Auteur . - 2014 . - pp. 215–226. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 215–226 Mots-clés : Metal  foam;  Flow;  Boiling;  Flow  pattern;  Heat  transfer;  Correlation Résumé : Flow boiling heat transfer characteristics of refrigerant in tubes filled with metal foams were experimentally investigated at a saturation temperature of 7 °C, mass flux from 10 to 90 kg m−2 s−1, vapor quality from 0.1 to 0.8 and heat flux from 3.1 to 18.3 kW m−2. The refrigerant is R410A. The test sections are tubes with inner diameter of 23.4 or 13.8 mm, filled with 5 or 10 PPI copper foam. The experimental results reveal that, metal foam enhances the flow boiling heat transfer by a maximum of 220% and promotes the flow pattern transition from stratified flow to stratified-wavy flow and from stratified-wavy flow to annular flow. The heat transfer coefficient decreases with vapor quality under low mass flux, while it increases with vapor quality under high mass flux. A correlation for predicting the flow boiling heat transfer was developed and it agrees well with the experimental data. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001011

Influence of oil on nucleate pool boiling heat transfer of refrigerant on metal foam covers / Yu Zhu in International journal of refrigeration, Vol. 34 N° 2 (Mars 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 2 (Mars 2011) . - pp. 509-517 Titre : Influence of oil on nucleate pool boiling heat transfer of refrigerant on metal foam covers Titre original : Influence de l'huile sur le transfert de chaleur lors de l'ébullition libre nucléée d'un frigorigène sur des mousses métalliques Type de document : texte imprimé Auteurs : Yu Zhu, Auteur ; Haitao Hu, Auteur ; Guoliang Ding, Auteur Année de publication : 2011 Article en page(s) : pp. 509-517 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Correlation  Foam  Metal  Oil  Pool  boiling  Refrigerant Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixture on metal foam covers were experimentally investigated. The refrigerant is R113, and the oil is VG68. The copper foams, having ppi (pores per inch) of 10 and 20, porosity from 90% to 98%, and thickness of 5 mm, are selected in this study. Experimental conditions include a saturation pressure of 101 kPa, oil concentrations from 0 to 5%, and heat fluxes from 0 to 80 kW m−2. The experimental results indicate that the nucleate pool boiling heat transfer coefficient on copper foam covers is larger than that on flat heated surface by a maximum of 160% under the present experimental conditions; the presence of oil deteriorates the nucleate pool boiling heat transfer on copper foam covers by a maximum of 15% under the present experimental conditions, and the deterioration of oil on nucleate pool boiling heat transfer on copper foam covers is lower than that on a flat heated surface. A correlation for predicting the nucleate pool boiling heat transfer coefficient of refrigerant/oil mixture on copper foam cover is developed, and it agrees with 95% of the experimental data within a deviation of ±20%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002355 [article] Influence of oil on nucleate pool boiling heat transfer of refrigerant on metal foam covers = Influence de l'huile sur le transfert de chaleur lors de l'ébullition libre nucléée d'un frigorigène sur des mousses métalliques [texte imprimé] / Yu Zhu, Auteur ; Haitao Hu, Auteur ; Guoliang Ding, Auteur . - 2011 . - pp. 509-517. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 2 (Mars 2011) . - pp. 509-517 Mots-clés : Correlation  Foam  Metal  Oil  Pool  boiling  Refrigerant Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixture on metal foam covers were experimentally investigated. The refrigerant is R113, and the oil is VG68. The copper foams, having ppi (pores per inch) of 10 and 20, porosity from 90% to 98%, and thickness of 5 mm, are selected in this study. Experimental conditions include a saturation pressure of 101 kPa, oil concentrations from 0 to 5%, and heat fluxes from 0 to 80 kW m−2. The experimental results indicate that the nucleate pool boiling heat transfer coefficient on copper foam covers is larger than that on flat heated surface by a maximum of 160% under the present experimental conditions; the presence of oil deteriorates the nucleate pool boiling heat transfer on copper foam covers by a maximum of 15% under the present experimental conditions, and the deterioration of oil on nucleate pool boiling heat transfer on copper foam covers is lower than that on a flat heated surface. A correlation for predicting the nucleate pool boiling heat transfer coefficient of refrigerant/oil mixture on copper foam cover is developed, and it agrees with 95% of the experimental data within a deviation of ±20%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002355