An Improved Two-Phase Pressure Drop Correlation for 180 degrees Return Bends

Published

May 1, 2006

Author(s)

Piotr A. Domanski, Christian Hermes

Abstract

A new correlation for two-phase flow pressure drop in 180? 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 radiuses (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.

Proceedings Title

Asian Conference on Refrigeration and Air Conditioning 2006 | 3rd | | The Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK)

Conference Dates

May 21-23, 2006

Conference Location

Gyeongju, KO

Conference Title

Asian Conference on Refrigeration and Air Conditioning (ACRA 2006)

Pub Type

Conferences

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Keywords

air conditioning, heat exchangers, pressure drop, refrigeration, return bends, two phase

Citation

Domanski, P. and Hermes, C. (2006), An Improved Two-Phase Pressure Drop Correlation for 180 degrees Return Bends, Asian Conference on Refrigeration and Air Conditioning 2006 | 3rd | | The Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK), Gyeongju, KO, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861004 (Accessed October 24, 2025)