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Pool boiling data and prediction method for enhanced boiling tubes with R-134a, R-236fa and R-1234ze(E) / E. Van Rooyen 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. 447–455 Titre : Pool boiling data and prediction method for enhanced boiling tubes with R-134a, R-236fa and R-1234ze(E) Titre original : Données sur l'ébullition libre et une méthode de prévision pour des tubes d'ébullition améliorés utilisés pour le R-134a, le R-236fa et le R-1234ze(E) Type de document : texte imprimé Auteurs : E. Van Rooyen, Auteur ; J. R. Thome, Auteur Année de publication : 2013 Article en page(s) : pp. 447–455 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Pool  boiling;  Enhancement;  Prediction;  Heat  transfer;  Two-phase  flow;  GWP Résumé : The phase-change process of enhanced surface pool boiling is an effective mode of heat transfer requiring on-going investigation with new refrigerants. Two of the latest generation Wolverine Tube Inc. (Turbo-B5) and Wieland Werke (Gewa-B5) enhanced boiling tubes have been studied under pool boiling conditions with refrigerants R-134a, R-236fa and R-1234ze(E). A 1.027 m length of tube with semi-local heat flux and heat transfer coefficient measurements was tested in each case. The Wilson plot method was validated and used to characterise the inside heat transfer coefficient of the heating water. Pool boiling tests were carried out for saturation temperatures of 5–25 °C and heat fluxes from 15 to 70 kW m−2, based on the outer tube diameter. It was found that heat flux and refrigerant type had the dominant effect on heat transfer. A new enhanced tube pool boiling correlation was proposed, based on a boiling heat transfer mechanism in the near-wall region. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003313 [article] Pool boiling data and prediction method for enhanced boiling tubes with R-134a, R-236fa and R-1234ze(E) = Données sur l'ébullition libre et une méthode de prévision pour des tubes d'ébullition améliorés utilisés pour le R-134a, le R-236fa et le R-1234ze(E) [texte imprimé] / E. Van Rooyen, Auteur ; J. R. Thome, Auteur . - 2013 . - pp. 447–455. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 447–455 Mots-clés : Pool  boiling;  Enhancement;  Prediction;  Heat  transfer;  Two-phase  flow;  GWP Résumé : The phase-change process of enhanced surface pool boiling is an effective mode of heat transfer requiring on-going investigation with new refrigerants. Two of the latest generation Wolverine Tube Inc. (Turbo-B5) and Wieland Werke (Gewa-B5) enhanced boiling tubes have been studied under pool boiling conditions with refrigerants R-134a, R-236fa and R-1234ze(E). A 1.027 m length of tube with semi-local heat flux and heat transfer coefficient measurements was tested in each case. The Wilson plot method was validated and used to characterise the inside heat transfer coefficient of the heating water. Pool boiling tests were carried out for saturation temperatures of 5–25 °C and heat fluxes from 15 to 70 kW m−2, based on the outer tube diameter. It was found that heat flux and refrigerant type had the dominant effect on heat transfer. A new enhanced tube pool boiling correlation was proposed, based on a boiling heat transfer mechanism in the near-wall region. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003313