Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 32, Issue 6, Pages 1259-1270Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2009.01.025
Keywords
Heat exchanger; Evaporator; Smooth tube; Horizontal tube; Experiment; Heat transfer; Boiling; R113; Additive; Particle; Oxide; Copper
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Funding
- Ministry of Education of China [NCET-05-0403]
- International Copper Association
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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(-2) s(-1), heat fluxes from 3.08 to 6.16 kW m(-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%. (C) 2009 Elsevier Ltd and IIR. All rights reserved.
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