An experimental characterization of downwards gas-liquid annular flow by laser-induced fluorescence: flow regimes and film statistics
File(s)
Accepted version
Author(s)
Zadrazil, Ivan
Matar, Omar K
Markides, Christos N
Type
Journal Article
Abstract
Downwards co-current gas–liquid annular flows were studied experimentally and characterized. An
advanced optical laser-based measurement technique, namely Planar Laser-Induced Fluorescence (PLIF),
was used for the visualization of the annular flow over a range of liquid Reynolds numbers ReL ¼ 306—1532 and gas Reynolds numbers ReG ¼ 0—84600. Four distinct flow regimes, namely the ‘dual-wave’, ‘thick ripple’, ‘disturbance wave’ and ‘regular wave’ regimes, have been identified based on qualitative information and a consequent quantitative analysis that provided information on the film thickness, interface and wave statistics, and gas entrainment into the liquid film. The mean film thickness data are generally in good agreement with previous studies. Evidence suggests that the turbulent gas phase affects strongly the shape of the interface, and that the mechanism for gas entrainment into the liquid film is strongly reliant on the existence of large-amplitude waves.
advanced optical laser-based measurement technique, namely Planar Laser-Induced Fluorescence (PLIF),
was used for the visualization of the annular flow over a range of liquid Reynolds numbers ReL ¼ 306—1532 and gas Reynolds numbers ReG ¼ 0—84600. Four distinct flow regimes, namely the ‘dual-wave’, ‘thick ripple’, ‘disturbance wave’ and ‘regular wave’ regimes, have been identified based on qualitative information and a consequent quantitative analysis that provided information on the film thickness, interface and wave statistics, and gas entrainment into the liquid film. The mean film thickness data are generally in good agreement with previous studies. Evidence suggests that the turbulent gas phase affects strongly the shape of the interface, and that the mechanism for gas entrainment into the liquid film is strongly reliant on the existence of large-amplitude waves.
Date Issued
2014-04-01
Date Acceptance
2013-11-19
Citation
International Journal of Multiphase Flow, 2014, 60, pp.87-102
ISSN
0301-9322
Publisher
Elsevier
Start Page
87
End Page
102
Journal / Book Title
International Journal of Multiphase Flow
Volume
60
Copyright Statement
Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000332821700008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
Annular flow
DRAG
Entrainment
Film statistics
Flow regimes
HEAT-TRANSFER
Laser-induced fluorescence
Mechanics
Science & Technology
SIZE DISTRIBUTION
Technology
THIN
TRANSITION
WAVY FILMS
Publication Status
Published
Date Publish Online
2013-12-03