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Flow Boiling Visualization of R-134a in a Vertical Channel of Small Diameter
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2010 (English)In: Journal of heat transfer, ISSN 0022-1481, E-ISSN 1528-8943, Vol. 132, no 3, 031001- p.Article in journal (Refereed) Published
Abstract [en]

The present work reports on flow boiling visualization of refrigerant R-134a in a vertical circular channel with an internal diameter of 1.33 mm and 235 mm in heated length. A quartz tube with a homogeneous Indium Tin Oxide coating is used to allow heating and simultaneous visualization. Flow patterns have been observed along the heated length with the aid of high-speed complementary metal oxide semiconductor (CMOS) digital camera. From the flow boiling visualization, seven distinct two-phase flow patterns have been observed: isolated bubbly flow, confined bubbly flow, slug flow, churn flow, slug-annular flow, annular flow, and mist flow. Two-phase flow pattern observations are presented in the form of flow pattern maps. The effects of the saturation temperature and the inlet subcooling degree on the two-phase flow pattern transitions are elucidated. Finally, the experimental flow pattern map is compared with models developed for conventional sizes as well as to a microscale map for air-water mixtures available in literature, showing a large discrepancy.

Place, publisher, year, edition, pages
2010. Vol. 132, no 3, 031001- p.
Keyword [en]
boiling, flow visualisation, microchannel flow, pattern formation, refrigerants, two-phase flow, undercooling
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-29077DOI: 10.1115/1.4000012ISI: 000273365100001Scopus ID: 2-s2.0-77954538869OAI: oai:DiVA.org:kth-29077DiVA: diva2:391864
Note
QC 20110125Available from: 2011-01-25 Created: 2011-01-25 Last updated: 2017-12-11Bibliographically approved

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Palm, Björn E.

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