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Heat transfer characteristics of refrigerant-oil mixtures flow boiling in a horizontal C-shape curved smooth tube / Haitao Hu in International journal of refrigeration, Vol. 33 N° 5 (Août 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 932-943 Titre : Heat transfer characteristics of refrigerant-oil mixtures flow boiling in a horizontal C-shape curved smooth tube Titre original : Caractéristiques du transfert de chaleur de mélanges frigorigène/huile en ébullition en écoulement à l'intérieur d'un tube lisse horizontal sous forme de C Type de document : texte imprimé Auteurs : Haitao Hu, Auteur ; Guoliang Ding, Auteur ; Wenjian Wei, Auteur Année de publication : 2010 Article en page(s) : pp. 932-943 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Geometry  Heat  transfer  Boiling  Mixture  Refrigerant  Oil  Correlation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Two-phase heat transfer characteristics of R410A–POE oil mixture and R22-mineral oil mixture flow boiling inside a horizontal C-shape curved smooth tube with an outside diameter of 7.0 mm and a curvature ratio of 60 were investigated experimentally. The test results show that the curvature of C-shape curved smooth tube deteriorates the flow boiling heat transfer, and the ratios of the heat transfer coefficients in C-shape curved smooth tube to those in straight smooth tube for R410A–oil mixture and R22–oil mixture are within 0.46–0.74 and 0.74–0.90, respectively. A correlation to predict the heat transfer coefficients of refrigerant-oil mixtures flow boiling inside C-shape curved smooth tube was developed based on mixture properties of refrigerant-oil, and it could agree with 96% of the experimental data within a deviation of ±20%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000411 [article] Heat transfer characteristics of refrigerant-oil mixtures flow boiling in a horizontal C-shape curved smooth tube = Caractéristiques du transfert de chaleur de mélanges frigorigène/huile en ébullition en écoulement à l'intérieur d'un tube lisse horizontal sous forme de C [texte imprimé] / Haitao Hu, Auteur ; Guoliang Ding, Auteur ; Wenjian Wei, Auteur . - 2010 . - pp. 932-943. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 932-943 Mots-clés : Heat  exchanger  Geometry  Heat  transfer  Boiling  Mixture  Refrigerant  Oil  Correlation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Two-phase heat transfer characteristics of R410A–POE oil mixture and R22-mineral oil mixture flow boiling inside a horizontal C-shape curved smooth tube with an outside diameter of 7.0 mm and a curvature ratio of 60 were investigated experimentally. The test results show that the curvature of C-shape curved smooth tube deteriorates the flow boiling heat transfer, and the ratios of the heat transfer coefficients in C-shape curved smooth tube to those in straight smooth tube for R410A–oil mixture and R22–oil mixture are within 0.46–0.74 and 0.74–0.90, respectively. A correlation to predict the heat transfer coefficients of refrigerant-oil mixtures flow boiling inside C-shape curved smooth tube was developed based on mixture properties of refrigerant-oil, and it could agree with 96% of the experimental data within a deviation of ±20%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000411

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

Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. / Peng, Hao in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1823–1832 Titre : Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. : Part I: Experimental measurement Titre original : Influences de la composition et le chauffage d'un nanofluide sur la migration des nanoparticules lors de l'ébullition libre. Partie I : mesures expérimentales Type de document : texte imprimé Auteurs : Peng, Hao, Auteur ; Guoliang Ding, Auteur ; Haitao Hu, Auteur Année de publication : 2012 Article en page(s) : pp. 1823–1832 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Heat  flux  Oil  Particle  Pool  boiling  Refrigerant Résumé : Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling were investigated experimentally. The nanoparticles include Cu (average diameters of 20, 50 and 80 nm), Al and Al2O3 (average diameters of 20 nm), and CuO (average diameter of 40 nm). The refrigerants include R113, R141b and n-pentane. The mass fraction of lubricating oil RB68EP is from 0 to 10 wt%, the heat flux is from 10 to 100 kW m−2, and the initial liquid-level height is from 1.3 to 3.4 cm. The experimental results show that the migration ratio of nanoparticles during the pool boiling of refrigerant-based nanofluid increases with the decrease of nanoparticle density, nanoparticle size, dynamic viscosity of refrigerant, mass fraction of lubricating oil or heat flux; while increases with the increase of liquid-phase density of refrigerant or initial liquid-level height. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001848 [article] Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. = Influences de la composition et le chauffage d'un nanofluide sur la migration des nanoparticules lors de l'ébullition libre. Partie I : mesures expérimentales : Part I: Experimental measurement [texte imprimé] / Peng, Hao, Auteur ; Guoliang Ding, Auteur ; Haitao Hu, Auteur . - 2012 . - pp. 1823–1832. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1823–1832 Mots-clés : Heat  flux  Oil  Particle  Pool  boiling  Refrigerant Résumé : Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling were investigated experimentally. The nanoparticles include Cu (average diameters of 20, 50 and 80 nm), Al and Al2O3 (average diameters of 20 nm), and CuO (average diameter of 40 nm). The refrigerants include R113, R141b and n-pentane. The mass fraction of lubricating oil RB68EP is from 0 to 10 wt%, the heat flux is from 10 to 100 kW m−2, and the initial liquid-level height is from 1.3 to 3.4 cm. The experimental results show that the migration ratio of nanoparticles during the pool boiling of refrigerant-based nanofluid increases with the decrease of nanoparticle density, nanoparticle size, dynamic viscosity of refrigerant, mass fraction of lubricating oil or heat flux; while increases with the increase of liquid-phase density of refrigerant or initial liquid-level height. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001848

Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. / Peng, Hao in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1833–1845 Titre : Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. : Part II: Model development and validation Titre original : Influences de la composition et le chauffage d'un nanofluide sur la migration des nanoparticules lors de l'ébullition libre. Partie II : développement et validation du modèle Type de document : texte imprimé Auteurs : Peng, Hao, Auteur ; Guoliang Ding, Auteur ; Haitao Hu, Auteur Année de publication : 2012 Article en page(s) : pp. 1833–1845 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Bubble  Liquid  Model  Particle  CFD  Vapor Résumé : The objective of this study is to propose a model for predicting the migration characteristics of nanoparticles during the refrigerant-based nanofluid pool boiling. In establishing the present model, the departure and rising processes of bubble, as well as the movement of nanoparticles in the liquid-phase are firstly simulated; then the capture of nanoparticles by bubble and the escape of nanoparticles from the liquid–vapor interface are simulated; finally, the migration ratio of nanoparticles is obtained by flotation theory combining the analysis on the boiling process. The proposed model can predict the influences of nanoparticle type, nanoparticle size, refrigerant type, mass fraction of lubricating oil, heat flux and initial liquid-level height on the migration of nanoparticles. The migration ratio of nanoparticles predicted by the model can agree with 90% of the experimental data of within a deviation of ±20%, and the mean deviation is 12.1%. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001836 [article] Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling. = Influences de la composition et le chauffage d'un nanofluide sur la migration des nanoparticules lors de l'ébullition libre. Partie II : développement et validation du modèle : Part II: Model development and validation [texte imprimé] / Peng, Hao, Auteur ; Guoliang Ding, Auteur ; Haitao Hu, Auteur . - 2012 . - pp. 1833–1845. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1833–1845 Mots-clés : Bubble  Liquid  Model  Particle  CFD  Vapor Résumé : The objective of this study is to propose a model for predicting the migration characteristics of nanoparticles during the refrigerant-based nanofluid pool boiling. In establishing the present model, the departure and rising processes of bubble, as well as the movement of nanoparticles in the liquid-phase are firstly simulated; then the capture of nanoparticles by bubble and the escape of nanoparticles from the liquid–vapor interface are simulated; finally, the migration ratio of nanoparticles is obtained by flotation theory combining the analysis on the boiling process. The proposed model can predict the influences of nanoparticle type, nanoparticle size, refrigerant type, mass fraction of lubricating oil, heat flux and initial liquid-level height on the migration of nanoparticles. The migration ratio of nanoparticles predicted by the model can agree with 90% of the experimental data of within a deviation of ±20%, and the mean deviation is 12.1%. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001836

Nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant / Haitao Hu in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1045–1055 Titre : Nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant Titre original : Caractéristiques du transfert de chaleur lors de l'ébullition libre nucléée d'un mélange frigorigène / nanolubrifiant contenant un agent tensio-actif Type de document : texte imprimé Auteurs : Haitao Hu, Auteur ; Peng, Hao, Auteur ; Guoliang Ding, Auteur Année de publication : 2013 Article en page(s) : pp. 1045–1055 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Additive;  Nucleate  boiling;  Lubricant;  Particle;  Refrigerant Résumé : The objective of this paper is to investigate the nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant. In the experiments, three types of surfactants including SDS, CTAB and Span-80 were used. Nanolubricant was formed from Cu nanoparticles and oil VG68. The results show that, the ratio of heat transfer coefficient of refrigerant/nanolubricant mixture with surfactant to that without surfactant (defined as surfactant impact factor, SIF) are within 0.85–1.58, 0.73–1.31, and 0.68–1.24 for SDS, CTAB and Span-80, respectively. The values of SIF increase with the increase of surfactant concentration and then decrease, and increase with the decrease of surfactant molecular weight, nanolubricant concentration and heat flux. A nucleate pool boiling heat transfer correlation for refrigerant/nanolubricant mixture was proposed, and it agrees well with the experimental data of refrigerant/nanolubricant mixture with surfactant and that without surfactant. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003581 [article] Nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant = Caractéristiques du transfert de chaleur lors de l'ébullition libre nucléée d'un mélange frigorigène / nanolubrifiant contenant un agent tensio-actif [texte imprimé] / Haitao Hu, Auteur ; Peng, Hao, Auteur ; Guoliang Ding, Auteur . - 2013 . - pp. 1045–1055. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1045–1055 Mots-clés : Additive;  Nucleate  boiling;  Lubricant;  Particle;  Refrigerant Résumé : The objective of this paper is to investigate the nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant. In the experiments, three types of surfactants including SDS, CTAB and Span-80 were used. Nanolubricant was formed from Cu nanoparticles and oil VG68. The results show that, the ratio of heat transfer coefficient of refrigerant/nanolubricant mixture with surfactant to that without surfactant (defined as surfactant impact factor, SIF) are within 0.85–1.58, 0.73–1.31, and 0.68–1.24 for SDS, CTAB and Span-80, respectively. The values of SIF increase with the increase of surfactant concentration and then decrease, and increase with the decrease of surfactant molecular weight, nanolubricant concentration and heat flux. A nucleate pool boiling heat transfer correlation for refrigerant/nanolubricant mixture was proposed, and it agrees well with the experimental data of refrigerant/nanolubricant mixture with surfactant and that without surfactant. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003581

Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixture with diamond nanoparticles / Peng, Hao in International journal of refrigeration, Vol. 33 N° 2 (Mars 2010) 

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