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Experiments in Fluids

, 60:42 | Cite as

Two-phase flow measurements of an unsteady breaking bore

  • Xinqian Leng
  • Hubert ChansonEmail author
Research Article

Abstract

A key feature of breaking bores, jumps, and spilling breakers is the roller region, characterised by intense shear and recirculation, associated with air bubble entrainment and splashing. Detailed unsteady air–water flow measurements were conducted in a breaking bore propagating in a large-size channel, using an array of dual-tip phase-detection probes and an ultra-high-speed video camera. The results showed a steep roller front, with a very-dynamic air–water bubbly region, albeit with a relatively limited air–water roller region. In this study, a major challenge was the inconsistency in light intensity linked to the travelling nature of the bore. A simple flow visualisation technique was applied to retrieve the two-dimensional side-looking profile of the roller edge and average void fraction. The results were validated independently with a phase-detection probe. While the probe data lacked spatial variability, the study reinforces the needs of high-quality validation data set, including in unsteady transient flows.

Notes

Acknowledgements

The authors would like to thank Dr Hubert Branger (IRPHE, University of Marseille, France) and Dr Jorge Leandro (Technical University of Munich, Germany) for their detailed review of the report and valuable comments. They acknowledge the helpful inputs of Professor Pierre Lubin (University of Bordeaux, France) and Dr Hang Wang (The University of Queensland, Australia), as well as discussions with Dr Gangfu Zhang (The University of Queensland, Australia) and Dr Matthias Kramer (The University of Queensland, Australia). The authors thank the reviewers for their helpful and constructive comment. The technical assistance of Jason Van Der Gevel and Stewart Matthews (The University of Queensland, Australia) is greatly appreciated.

Supplementary material

348_2019_2689_MOESM1_ESM.avi (70.4 mb)
Supplementary material 1 (AVI 72102 KB)
348_2019_2689_MOESM2_ESM.avi (162.3 mb)
Supplementary material 2 (AVI 166150 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Civil EngineeringThe University of QueenslandBrisbaneAustralia

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