Evaporation heat transfer and flow characteristics of R-134a flowing through internally grooved tubes
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Author list: Wongwises S., Laohalertdecha S., Kaew-On J., Duangthongsuk W., Aroonrat K., Sakamatapan K.
Publisher: Springer
Publication year: 2011
Journal: Heat and Mass Transfer (0947-7411)
Volume number: 47
Issue number: 6
Start page: 629
End page: 640
Number of pages: 12
ISSN: 0947-7411
eISSN: 1432-1181
Languages: English-Great Britain (EN-GB)
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Abstract
This article describes experimental investigations of the heat transfer coefficient and pressure drop of R-134a flowing inside internally grooved tubes. The test tubes are one smooth tube and four grooved tubes. All test tubes are made from type 304 stainless steel, have an inner diameter of 7.1 mm, are 2,000 mm long and are installed horizontally. The test section is uniformly heated by a DC power supply to create evaporation conditions. The groove depth of all grooved tubes is fixed at 0.2 mm. The experimental conditions are conducted at saturation temperatures of 20, 25 and 30ฐC, heat fluxes of 5, 10 and 15 kW/m2, and mass fluxes of 300, 500 and 700 kg/m2 s. The effects of groove pitch, mass flux, heat flux, and saturation temperature on heat transfer coefficient and frictional pressure drop are discussed. The results illustrate that the grooved tubes have a significant effect on the heat transfer coefficient and frictional pressure drop augmentations. ฉ 2010 Springer-Verlag.
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