A numerical investigation of flow boiling of non-azeotropic and near-azeotropic binary mixtures. (January 2015)

• Record Type: Journal Article
• Authors: Deng, Han; Fernandino, Maria; Dorao, Carlos A.
• Is Part Of: International journal of refrigeration. Volume 49(2015:Jan.)
• Page Start: 99
• Page End: 109
• Publication Date: 2015-01
• Subjects: Numerical model -- Non-azeotropic refrigerants -- Near-azeotropic refrigerants -- Pressure drop -- Heat transfer; Modèle numérique -- Frigorigènes non azéotropiques -- Frigorigènes quasi-azéotropiques -- Chute de pression -- Transfert de chaleur; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2014.10.003
• Languages: English
• ISSNs: 0140-7007

Abstract

Abstract: The flow and heat transfer characteristics of binary refrigerant mixtures in a heated horizontal tube were investigated numerically. The pressure drop, temperature profile, and heat transfer coefficient for non-azeotropic and near-azeotropic mixtures of different bulk compositions were obtained. It is found that the non-linear physical properties of the mixtures strongly affect the pressure drop characteristics. Both the fluid properties and mass transfer resistance are responsible for the heat transfer characteristics. The mass transfer resistance has a more significant influence on the nucleate boiling than the convective evaporation for non-azeotropic mixtures, while the resistance can be neglected for near-azeotropic mixtures. Highlights: The single-phase and two-phase flows for binary refrigerant mixtures are studied by steady-state 1D models. The model is validated with the experimental data fromTakamatsu et al. (1993) . The effect of fluid physical properties on pressure drop is studied. The effect of fluid properties and mass transfer resistance on heat transfer is studied.