Abstract
Past researchers have studied particle entrainment on a flat-bed and the flow fields in a rectangular cavity without considering particle entrainment. However, particle entrainment from a rectangular cavity, which hitherto had rarely been studied, is the focus of this study. The entrainment phenomenon is investigated by using a frequentist probabilistic approach. The spatial and temporal variations of the cavity and flat-bed flow fields are compared using measurements from the particle image velocimetry and acoustic doppler velocimetry techniques. The particle’s motion from the cavity is superimposed onto the measured flow field to examine the mechanism of entrainment. The results show that particle entrainment from a cavity subjected to the same approach flow takes place over a wide range of the Shields parameter and in highly variable time duration. Additionally, the particle’s upward trajectory reveals how the highly turbulent and unsteady flow affects the entrainment process, resulting in the observed stochastic trend.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including the data of figures and tables in excel format.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Project No. 52122109). The NTU Research Scholarship provided to the second author by Nanyang Technological University is gratefully acknowledged.
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Published In
Journal of Hydraulic Engineering
Volume 148 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 12, 2021
Accepted: Jan 18, 2022
Published online: Mar 14, 2022
Published in print: May 1, 2022
Discussion open until: Aug 14, 2022
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Cited by
- Yushu Xie, Bruce W. Melville, Asaad Y. Shamseldin, Colin N. Whittaker, Yifan Yang, Smart Sediment Particle: A novel approach to investigating fluvial bed entrainment using instrumented sensors, International Journal of Sediment Research, 10.1016/j.ijsrc.2022.08.003, 38, 1, (66-82), (2023).