Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 115, Issue -, Pages 1223-1232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2017.07.101
Keywords
R32; Flow boiling; Flow pattern; Map; Visualization
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Funding
- Tsinghua University [20131089319]
- National Natural Science Fund for Creative Research Groups [51621062]
- Natural Science Foundation of Tianjin [17JCYBJC21100]
- Self-innovation Foundation of Tianjin University [2017XYF-0011]
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The two-phase flow patterns of R32 flow boiling in horizontal mini channels were investigated. The working conditions cover 1 and 2 mm channel inner diameters, 10-20 degrees C saturation temperatures, 50-600 kg m(-2) s(-1) mass fluxes, 10-30 kW m(-2) heat fluxes and 0-1 vapor qualities. Slug flow, churn flow, annular flow, dryout, mist flow and stratified flow were observed. The slug flow region is smaller with increasing mass flux and is larger with increasing tube diameter, saturation temperature or heat flux; the annular flow region is smaller with increasing tube diameter, saturation temperature, mass flux or heat flux; the mist flow region is larger with increasing saturation temperature, mass flux or heat flux and is smaller with increasing tube diameter. The existing flow-pattern maps cannot well predict the flow patterns of R32 flow boiling in mini channels. By adopting the existing correlations and introducing Bo number, a new flow-pattern map was established and it agrees 97.6% of the experimental data in this study. (C) 2017 Elsevier Ltd. All rights reserved.
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