The pressure drop, heat transfer and dryout characteristics of five different refrigerants in a 1-cm-diam tube are numerically investigated using a novel approach to model the mass transfer associated with ebullition in the liquid film using computational fluid dynamics. The four different mass transfer mechanisms, namely, entrainment, deposition, evaporation, and condensation, are included in the computational model. The model is validated through comparison with experimental results of Stevanovic et al. as well as those of Lee and Lee. A comparison of the numerical predictions for the four R refrigerants with carbon dioxide reveals that the carbon dioxide consistently has longer dryout lengths and higher heat transfer rates for a given heat flux and operating pressure.
Numerical Evaluation of Two-Phase Heat and Fluid Flow of Widely Used Refrigerants
Journal of Thermophysics and Heat Transfer ; 28 , 3 ; 485-490
2014-05-30
6 pages
Article (Journal)
Electronic Resource
English
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