Flow boiling heat transfer of R600a in a uniformly heated smooth vertical minichannel
2013 (English)In: Proceedings of the 13th UK Heat Transfer Conference Sept. 2-3, 2013, UKHTC2013, 2013Conference paper (Refereed)
Refrigerant related environmental concerns forced legislative bodies to phase out some types of refrigerants namely CFC’s and HCFC’s and in the near future European legislation will be affecting HFCs as well. Natural refrigerants such as hydrocarbons can thus be expected to be more common as refrigerants in the future. Experimental studies with these fluids are important in understanding their performance and potential. Experimental findings on flow boiling of Isobutane in a uniformly heated, vertical, stainless steel test section (1.6 mm inside diameter and 245mm heated length) are reported in this article. Experiments were conducted at two saturation pressures corresponding to the temperature of 27 and 32 oC, with five mass fluxes in the range 50-350 kg/m2s and at outlet vapour qualities up till dryout conditions. Analysis showed that heat transfer was primarily controlled by the applied heat flux with insignificant effect of mass flux and vapor quality. The experimental results were compared with different macro and micro-scale correlations from the literature, and Owhaib, Liu & Winterton and Mikielewicz correlations quite accurately predicted the heat transfer data.
Place, publisher, year, edition, pages
Engineering and Technology Energy Engineering
IdentifiersURN: urn:nbn:se:kth:diva-136072ISBN: 978-0-9572298-5-3OAI: oai:DiVA.org:kth-136072DiVA: diva2:670478
13th UK Heat Transfer Conference, 2-3 September 2013, London, England
NQC 20142013-12-032013-12-032014-06-11Bibliographically approved