Two-phase friction pressure drop of small diameter U-type wavy pipes

Ing Youn Chen, Yee Kang Lai, Bing Chwen Yang, Chi Chung Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Measured frictional pressure drops for single-phase water and two-phase air-water mixture flowing in nine small diameter U-type wavy tubes were presented. The inner diameters of the wavy tubes are 3.43 - 8.29 mm, whereas the curvature ratios span from 3.75~7.87. Test range of the Reynolds number for the single-phase water tests is about 200 < Re < 18000. The two-phase superficial velocities for air and water are in the range of UL,S = 0.02 - 0.7 m/s and UG,S = 0.2-60 m/s. The measured pressure loss in U-type wavy tube included the loss in U bends and the loss caused by the distorted flow in the downstream straight tube. This leads to the definition of the equivalent friction factor, fB and the two-phase pressure gradient in the U-bend. An empirical friction factor equation as a function of curvature ratio and spacer length, new Dean number and Re has been correlated from the present data with a bean deviation of 5.6%. The frictional characteristics of two-phase flows in U-type wavy pipes are also found related to the Lockhart-Martinelli relationship, the total mass flux and the curvature ratio (2R/D). However, the effect of the mass flux diminishes as the mass flux increases, G > 400 kg/m2·s and Martinelli parameter X < 0.3.

Original languageEnglish
Title of host publication8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101182
DOIs
StatePublished - 2002
Event8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 2002 - St. Louis, MO, United States
Duration: 24 Jun 200226 Jun 2002

Publication series

Name8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

Conference

Conference8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 2002
CountryUnited States
CitySt. Louis, MO
Period24/06/0226/06/02

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