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)  

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