Air–water properties of unsteady breaking bores part 1: Novel Eulerian and Lagrangian velocity measurements using intrusive and non-intrusive techniques

Shi, Rui; Wüthrich, D.; Chanson, Hubert

doi:10.1016/j.ijmultiphaseflow.2022.104338

Air–water properties of unsteady breaking bores part 1

Title

Air–water properties of unsteady breaking bores part 1: Novel Eulerian and Lagrangian velocity measurements using intrusive and non-intrusive techniques

Author

Shi, Rui (University of Queensland)
Wüthrich, D. (TU Delft Hydraulic Structures and Flood Risk; University of Queensland)
Chanson, Hubert (University of Queensland)

Date

2023

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.

Subject

Breaking bore
Dual-tip phase detection probe
Optical flow
Particle tracking velocimetry
Single bubble event detection
Unsteady gas–liquid flow

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http://resolver.tudelft.nl/uuid:eedfce92-ccbe-4261-a0c9-ac94bd78c491

DOI

https://doi.org/10.1016/j.ijmultiphaseflow.2022.104338

Embargo date

2023-06-11

ISSN

0301-9322

Source

International Journal of Multiphase Flow, 159

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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Institutional Repository

Document type

journal article

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