Three-component turbulent velocity fields in the liquid phase of air-water horizontal intermittent pipe flows

•Three component PIV velocity measurements in liquid plug region.•Ensemble-averaged turbulent velocity fields and profiles.•Identification of vortex structures under the gas bubble in the liquid film region.•3D reconstruction of the bubble nose shape.•Wall shear stress measurements at the liquid plu...

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Bibliographic Details
Published in:International journal of multiphase flow 2023-05, Vol.162, p.104378, Article 104378
Main Authors: Fernandes, Leonardo S., de Mesquita, Rodrigo S. N., Martins, Fabio J. W. A., Azevedo, Luis F. A.
Format: Article
Language:English
Subjects:
Gas-liquid flow
Intermittent flow
Stereoscopic PIV
Velocity field
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Summary:•Three component PIV velocity measurements in liquid plug region.•Ensemble-averaged turbulent velocity fields and profiles.•Identification of vortex structures under the gas bubble in the liquid film region.•3D reconstruction of the bubble nose shape.•Wall shear stress measurements at the liquid plug region. The present work describes an experimental study of a horizontal, gas-liquid pipe flow in the intermittent regime. Event-triggered, high-speed stereoscopic particle image velocimetry (SPIV) combined with laser-induced fluorescence (LIF) were used to measure all three components of the velocity vector at different pipe cross-sections, referred to the elongated bubble nose tip. A 40-mm inner diameter pipe was used as test section, while water and air with superficial velocities of jL = 0.3, 0.4 and 0.5 m/s, and jG = 0.5 m/s formed the intermittent flow pattern. A set of photogate sensors was used to measure the two-phase flow statistics, and to trigger the SPIV system, allowing for the determination of ensemble-averaged, three-component velocity fields of the turbulent liquid flow in cross-stream planes around the elongated gas bubble. The original data obtained revealed the influence of the faster-moving gas bubbles on the dynamics of the liquid velocity field, providing valuable information for a better understanding of the physics governing the flow, and for validation of numerical models. The velocity measurements near the pipe bottom wall allowed the determination of the wall shear stress in the liquid plug region.
ISSN:0301-9322
1879-3533
DOI:10.1016/j.ijmultiphaseflow.2023.104378