Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 64, Issue -, Pages 802-807Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2013.05.024
Keywords
Carbon dioxide; CO2; Correlation; Flow boiling; Heat transfer; Evaporative
Categories
Funding
- National Natural Science Foundation of China [51176074]
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Carbon dioxide (CO2) has remarkable different flow boiling heat transfer characteristics from conventional refrigerants when evaporating at similar temperatures, for which a CO2-specific correlation of evaporative heat transfer coefficients is necessary. A number of correlations for two-phase flow boiling heat transfer coefficients were proposed, among which some are CO2-specific. However, their prediction accuracies for CO2 were not satisfactory. This work proposes a new CO2-specific correlation of flow boiling heat transfer coefficients based on the CO2 database of 2956 experimental data points collected from 13 independent studies. The new correlation incorporates a new dimensionless number and makes great progress in the prediction accuracy. It has a mean absolute deviation of 15.5%, and predicts 72.5% of the entire database within +/- 20% and 89.1% of the entire database within +/- 30%, far better than the most influential existing counterpart. The new dimensionless number is associated with the formation and departure of bubbles. (C) 2013 Elsevier Ltd. All rights reserved.
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