Cross-Beam Dissipators in Abruptly Expanding Channels: Experimental Analysis of Flow Patterns
Publication: Journal of Irrigation and Drainage Engineering
Volume 147, Issue 11
Abstract
Cross-section expansion can be a convenient solution to enhance the performance of stilling basins. However, under certain working conditions, the undesired phenomenon of flow instability can result in asymmetric flow with less efficient dissipation and high local velocity concentrations in the tailwater channel. This paper presents an experimental investigation on a recently proposed dissipator consisting of a series of cross beams, tested in various geometric configurations and under different hydraulic conditions. The effectiveness of the device is first analyzed in terms of flow uniformity and velocity in the channel bed while also providing a theoretical explanation of the observed dissipative mechanisms. Furthermore, in a second phase, the performance of the system is tested under variable tailwater conditions, with the description of the three-dimensional flow patterns observed in the downstream channel. The results suggest that the installation of this type of dissipator allows for the benefits of cross-section expansion while avoiding its damaging effects.
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Data Availability Statement
Experimental data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
We are grateful to the Research Council of Shahid Chamran University of Ahvaz for financial support (Grant No. 1399).
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Published In
Journal of Irrigation and Drainage Engineering
Volume 147 • Issue 11 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 28, 2021
Accepted: Jul 14, 2021
Published online: Aug 28, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 28, 2022
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