Local heat transfer coefficient for pool boiling of R-134a and R-123 on smooth and enhanced tubes

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dc.contributor.author Gorgy, Evraam
dc.contributor.author Eckels, Steven J.
dc.date.accessioned 2012-07-10T19:35:08Z
dc.date.available 2012-07-10T19:35:08Z
dc.date.issued 2012-05-01
dc.identifier.uri http://hdl.handle.net/2097/14018
dc.description.abstract The current paper presents experimental investigation of nucleate pool boiling of R-134a and R-123 on enhanced and smooth tubes. The enhanced tubes used were TBIIHP and TBIILP for R-134a and R-123, respectively. Pool boiling data were taken for smooth and enhanced tubes in a single tube test section. Data were taken at a saturation temperature of 4.44 °C. Each test tube had an outside diameter of 19.05 mm and a length of 1 m. The test section was water heated with an insert in the water passage. The insert allowed measurement of local water temperatures down the length of the test tube. Utilizing this instrumentation, local heat transfer coefficients were determined at five locations along the test tube. The heat flux range was 4-135 kW/m² for the TBIIHP tube and 5-60 kW/m² for the TBIILP tube. The resulting heat transfer coefficient range was 6,270-23,268 W/m².°C and 6,748-23,338 W/m².°C for both tubes, respectively. For smooth tube testing, the heat flux ranges were 7.3-130.7 kW/m² and 7.5-60.7 kW/m² for R-134a and R-123, respectively; with resulting heat transfer coefficient ranges of 1,798.9-11,379 kW/m².°C and 535.4-3,181.8 kW/m².°C. The study provided one of the widest heat flux ranges ever examined for these types of tubes and showed significant structure to the pool boiling curve that had not been traditionally observed. Additionally, this paper presented an investigation of enhanced tubes pool boiling models. en_US
dc.relation.uri http://doi.org/10.1016/j.ijheatmasstransfer.2012.02.012 en_US
dc.subject Boiling heat transfer en_US
dc.subject Refrigerants pool boiling en_US
dc.subject Flooded evaporators en_US
dc.subject Enhanced tubes en_US
dc.subject Local heat transfer coefficient en_US
dc.subject Enthalpy based heat transfer analysis en_US
dc.title Local heat transfer coefficient for pool boiling of R-134a and R-123 on smooth and enhanced tubes en_US
dc.type Article (author version) en_US
dc.date.published 2012 en_US
dc.citation.doi 10.1016/j.ijheatmasstransfer.2012.02.012 en_US
dc.citation.epage 3028 en_US
dc.citation.issue 11-12 en_US
dc.citation.jtitle International Journal of Heat and Mass Transfer en_US
dc.citation.spage 3021 en_US
dc.citation.volume 55 en_US
dc.contributor.authoreid eckels en_US

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