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Flow Boiling Heat Transfer Characteristics of a Minichannel up to Dryout Condition
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.
2011 (English)In: Journal of heat transfer, ISSN 0022-1481, E-ISSN 1528-8943, Vol. 133, no 8, p. 081501-Article in journal (Refereed) Published
Abstract [en]

In this paper, the experimental flow boiling heat transfer results of a minichannel are presented. A series of experiments was conducted to measure the heat transfer coefficients in a minichannel made of stainless steel (AISI 316) having an internal diameter of 1.70 mm and a uniformly heated length of 220 mm. R134a was used as a working fluid, and experiments were performed at two different system pressures corresponding to saturation temperatures of 27 degrees C and 32 degrees C. Mass flux was varied from 50 kg/m(2) s to 600 kg/m(2) s, and heat flux ranged from 2 kW/m(2) to 156 kW/m(2). The test section was heated directly using a dc power supply. The direct heating of the channel ensured uniform heating, which was continued until dryout was reached. The experimental results show that the heat transfer coefficient increases with imposed wall heat flux, while mass flux and vapor quality have no considerable effect. Increasing the system pressure slightly enhances the heat transfer coefficient. The heat transfer coefficient is reduced as dryout is reached. It is observed that the dryout phenomenon is accompanied with fluctuations and a larger standard deviation in outer wall temperatures.

Place, publisher, year, edition, pages
2011. Vol. 133, no 8, p. 081501-
Keywords [en]
microchannels, two-phase, boiling, heat transfer, dryout
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-45603DOI: 10.1115/1.4003669ISI: 000295611600013Scopus ID: 2-s2.0-79955518889OAI: oai:DiVA.org:kth-45603DiVA, id: diva2:453617
Note
QC 20111103Available from: 2011-11-03 Created: 2011-10-31 Last updated: 2017-12-08Bibliographically approved

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Palm, Björn E.

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