Correlations for evaporation heat transfer coefficient and two-phase friction factor for R-134a flowing through horizontal corrugated tubes
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Author list: Laohalertdecha S., Dalkilic A.S., Wongwises S.
Publisher: Elsevier
Publication year: 2011
Journal: International Communications in Heat and Mass Transfer (0735-1933)
Volume number: 38
Issue number: 10
Start page: 1406
End page: 1413
Number of pages: 8
ISSN: 0735-1933
eISSN: 1879-0178
Languages: English-Great Britain (EN-GB)
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Abstract
Correlations for the evaporation heat transfer coefficient and two-phase friction factor of R-134a flowing through horizontal corrugated tubes are proposed. In the present study, the test section is a horizontal counter-flow concentric tube-in-tube heat exchanger with R-134a flowing in the inner tube and hot water flowing in the annulus. Smooth tube and corrugated tubes with inner diameters of 8.7. mm and lengths of 2000. mm are used as the inner tube. The corrugation pitches are 5.08, 6.35, and 8.46. mm and the corrugation depths are 1, 1.25, and 1.5. mm, respectively. The outer tube is made from smooth copper tube with an inner diameter of 21.2. mm. The correlations presented are formed by using approximately 200 data points for five different corrugated tube geometries and are then proposed in terms of Nusselt number, equivalent Reynolds number, Prandtl number, corrugation pitch and depth, and inside diameter. ฉ 2011 Elsevier Ltd.
Keywords
corrugated tube, R-134a, Temperature, Two-phase friction factor
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