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Title: Velocity and phase distribution measurements in vertical air-water annular flows

Abstract

Annular flow topology for three air-water conditions in a vertical duct is investigated through the use of a traversing double-sensor hot-film anemometry probe and differential pressure measurements. Near wall measurements of mean and fluctuating velocities, as well as local void fraction, are taken in the liquid film, with the highest turbulent fluctuations occurring for the flow condition with the largest pressure drop. A modified law-of-the-wall formulation for wall shear is presented which, using near wall values of mean velocity and kinetic energy, agrees reasonably well with the average stress obtained from direct pressure drop measurements. The linear profile using wall coordinates in the logarithmic layer is preserved in annular flow; however, the slope and intercept of the profile differ from the single-phase values for the annular flow condition which has a thicker, more turbulent, liquid film.

Authors:
Publication Date:
Research Org.:
Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
OSTI Identifier:
350964
Report Number(s):
KAPL-P-000181; K-97073
ON: DE99001974; TRN: AHC29921%%150
DOE Contract Number:  
AC12-76SN00052
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1997
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; EXPERIMENTAL DATA; TWO-PHASE FLOW; ANNULAR SPACE; VELOCITY; DUCTS; PRESSURE DROP; VOID FRACTION; TURBULENT FLOW; SHEAR

Citation Formats

Vassallo, P. Velocity and phase distribution measurements in vertical air-water annular flows. United States: N. p., 1997. Web. doi:10.2172/350964.
Vassallo, P. Velocity and phase distribution measurements in vertical air-water annular flows. United States. https://doi.org/10.2172/350964
Vassallo, P. 1997. "Velocity and phase distribution measurements in vertical air-water annular flows". United States. https://doi.org/10.2172/350964. https://www.osti.gov/servlets/purl/350964.
@article{osti_350964,
title = {Velocity and phase distribution measurements in vertical air-water annular flows},
author = {Vassallo, P},
abstractNote = {Annular flow topology for three air-water conditions in a vertical duct is investigated through the use of a traversing double-sensor hot-film anemometry probe and differential pressure measurements. Near wall measurements of mean and fluctuating velocities, as well as local void fraction, are taken in the liquid film, with the highest turbulent fluctuations occurring for the flow condition with the largest pressure drop. A modified law-of-the-wall formulation for wall shear is presented which, using near wall values of mean velocity and kinetic energy, agrees reasonably well with the average stress obtained from direct pressure drop measurements. The linear profile using wall coordinates in the logarithmic layer is preserved in annular flow; however, the slope and intercept of the profile differ from the single-phase values for the annular flow condition which has a thicker, more turbulent, liquid film.},
doi = {10.2172/350964},
url = {https://www.osti.gov/biblio/350964}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 1997},
month = {Tue Jul 01 00:00:00 EDT 1997}
}