Heat transfer characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube Peng, Hao; Ding, Guoliang; Jiang, Weiting; Hu, Haitao [Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240 (China)]; Gao, Yifeng [International Copper Association Shanghai Office, 381 Huaihaizhong Road, Shanghai 200020 (China)] 42 ENGINEERING; REFRIGERANTS; HEAT TRANSFER; COPPER OXIDES; BOILING; EXPERIMENTAL DATA; TUBES; COPPER; PARTICLES; SULFUR IONS; NANOSTRUCTURES; VAPORS; HEAT EXCHANGERS; CORRELATIONS; EVAPORATION; MASS; HEAT FLUX; ADDITIVES; FORECASTING; PERFORMANCE; Heat exchanger; Evaporator; Smooth tube; Horizontal tube; Experiment; Heat transfer; Boiling; R113; Additive; Particle; Oxide; Copper Heat exchanger; Evaporator; Smooth tube; Horizontal tube; Experiment; Heat transfer; Boiling; R113; Additive; Particle; Oxide; Copper The objective of this paper is to investigate the influence of nanoparticles on the heat transfer characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube, and to present a correlation for predicting heat transfer performance of refrigerant-based nanofluid. For the convenience of preparing refrigerant-based nanofluid, R113 refrigerant and CuO nanoparticles were used. Experimental conditions include an evaporation pressure of 78.25 kPa, mass fluxes from 100 to 200 kg m{sup -2} s{sup -1}, heat fluxes from 3.08 to 6.16 kW m{sup -2}, inlet vapor qualities from 0.2 to 0.7, and mass fractions of nanoparticles from 0 to 0.5 wt%. The experimental results show that the heat transfer coefficient of refrigerant-based nanofluid is larger than that of pure refrigerant, and the maximum enhancement of heat transfer coefficient is 29.7%. A heat transfer correlation for refrigerant-based nanofluid is proposed, and the predictions agree with 93% of the experimental data within the deviation of {+-}20%. (author) Available from: http://dx.doi.org/10.1016/j.ijrefrig.2009.01.025 United Kingdom 2009-09-15 English Journal Article Journal Name: International Journal of Refrigeration; Journal Volume: 32; Journal Issue: 6; Other Information: Elsevier Ltd. All rights reserved Medium: X; Size: page(s) 1259-1270 https://doi.org/10.1016/J.IJREFRIG.2009.01.025 [] 6 32 Journal ID: ISSN 0140-7007; IJRFDI; TRN: GB09V2869 GB 2010-01-01 21222668