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Study of flow boiling characteristics of a microchannel using high speed visualization
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
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.
2013 (English)In: Journal of heat transfer, ISSN 0022-1481, E-ISSN 1528-8943, Vol. 135, no 8, 081501- p.Article in journal (Refereed) Published
Abstract [en]

This paper presents the visualization results obtained for an experimental study of R134a during flow boiling in a horizontal microchannel. The microchannel used was a fused silica tube having an internal diameter of 781 lm, a heated length of 191mm, and was coated with a thin, transparent, and electrically conductive layer of indium-tin-oxide (ITO) on the outer surface. The operating parameters during the experiments were: mass flux 100-400 kg/m2 s, heat flux 5-45 kW/m2, saturation temperatures 25 and 30 °C, corresponding to saturation pressures of 6.65 bar and 7.70 bar and reduced pressures of 0.163 and 0.189, respectively. A high speed camera with a close up lens was used to capture the flow patterns that evolved along the channel. Flow pattern maps are presented in terms of the superficial gas and liquid velocity and in terms of the Reynolds number and vapor quality plots. The results are compared with some flow pattern maps for conventional and micro scale channels available in the literature. Rigorous boiling and increased coalescence rates were observed with an increase in the heat flux.

Place, publisher, year, edition, pages
2013. Vol. 135, no 8, 081501- p.
Keyword [en]
Bubbles, Flow boiling, Flow patterns, Heat transfer, Microchannel
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-133392DOI: 10.1115/1.4023879ISI: 000326167900014Scopus ID: 2-s2.0-84883373886OAI: oai:DiVA.org:kth-133392DiVA: diva2:661852
Note

QC 20131105

Available from: 2013-11-05 Created: 2013-10-31 Last updated: 2017-12-06Bibliographically approved

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Palm, Björn

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