Air–water properties of unsteady breaking bores part 1

Novel Eulerian and Lagrangian velocity measurements using intrusive and non-intrusive techniques

Journal article (2023)

Authors

Rui Shi University of Queensland
Davide Wüthrich Hydraulic Structures and Flood Risk - CEG , University of Queensland
Hubert Chanson University of Queensland
Research Group
Hydraulic Structures and Flood Risk (CEG) (TU Delft)
Copyright: © 2023 Rui Shi, D. Wüthrich, Hubert Chanson
DOI: https://doi.org/10.1016/j.ijmultiphaseflow.2022.104338
Optical flow Particle tracking velocimetry Breaking bore Dual-tip phase detection probe Single bubble event detection Unsteady gas–liquid flow
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Hydraulic Structures and Flood Risk

Abstract

Transient motion, turbulence and bubble dynamics make any velocity quantification extremely difficult in unsteady gas–liquid flows. In the present study, novel Eulerian and Lagrangian techniques of velocimetry were developed, using both intrusive and non-intrusive measurements. The selected unsteady gas–liquid flow was a breaking bore, featured with a transient motion, air entrainment and coherent structures. Intrusively, Eulerian probe measurements resulted to the development of a single bubble event detection (SBED) technique in unsteady air–water flows. Non-intrusively, the motion of air–water pattern was detected using a novel particle tracking velocimetry (PTV). Both velocities obtained using SBED and PTV techniques were validated against the established optical flow (OF) results, achieving consistent velocity data among the three techniques. The filtering criteria of the SBED and PTV techniques were discussed, showing the best options in the breaking bore. It is concluded that the most robust velocity measurements in gas–liquid flow are achieved with consistent velocity data between the SBED, PTV and OF techniques.