Dryout characteristics of natural and synthetic refrigerants in single vertical mini-channels
2015 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 68, 257-267 p.Article in journal (Refereed) Published
Experimental results on dryout of seven refrigerants (R134a, R1234yf, R152a, R22, R245fa, R290 and R600a) in small, single vertical tubes under upward flow conditions are reported in this study. The experiments were conducted under a wide range of operating conditions in stainless steel tubes (0.64-1.70. mm and 213-245. mm heated length). The effects of operating parameters like mass flux, vapor quality, saturation pressure and channel size are discussed in detail. In general, dryout heat flux increased with increasing mass flux, and with increasing tube diameter. No effect of varying saturation temperature was observed. The experimental findings were compared with well-known macro and micro-scale correlations from the literature and it was found that Wu's correlation (in modified form) quite satisfactorily predicted the whole database. A new correlation for prediction of heat flux at dryout conditions is also proposed.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 68, 257-267 p.
Correlation, Dryout, Mini-channel, R1234yf, R134a, R152a, R22, R245fa, R290, R600a
IdentifiersURN: urn:nbn:se:kth:diva-170188DOI: 10.1016/j.expthermflusci.2015.04.016ISI: 000365361800025ScopusID: 2-s2.0-84930202428OAI: oai:DiVA.org:kth-170188DiVA: diva2:827654
QC 201506292015-06-292015-06-292015-12-18Bibliographically approved