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Improved Two-Phase Pressure Drop Correlation for 180DG Return Bends.


pdf icon Improved Two-Phase Pressure Drop Correlation for 180DG Return Bends. (296 K)
Domanski, P. A.; Hermes, C. J. L.

Asian Conference on Refrigeration and Air-Conditioning, 3rd. Proceedings. May 21-23, 2006, Gyeongju, Korea, 1-4 pp, 2006.

Keywords:

pressure drop; experiments; databases; correlation; equations; return bends; air conditioning; refrigeration

Abstract:

A new correlation for two-phase pressure drop in 180DG return bends is proposed based on a total of 241 experimental data points for R-22 and R-410A. The data span smooth tubes with inner diameters (D) from 3.25 mm to 11.63 mm, bend radii (R) from 6.35 mm to 37.25 mm, and curvature ratios (2R/D) from 2.32 to 8.15. The correlation predicts all data with a mean deviation of 15.7%, and 75% of the data fall within -25% error bands.