Flow Velocity and Water Layer Thickness at Vertical Ring Mesh Structures
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 8
Abstract
Vertically assembled ring meshes serve as barriers against explosive threats, in particular when overflowing water completely covers the mesh. The author measured the flow velocity over these structures using Surface Structure Image Velocimetry and subsequently determined the water layer thickness by taking into account discharges in the range . The water proceeds through and over the mesh and forms surface surges at lower discharges. The surges disappear for higher discharges and induce plain water curtains. Based on a momentum balance equation, a theoretical approach was derived to describe the flow dynamics. The free parameters, e.g., the surface roughness of the metal rings and the deflection angle at the rings, were analyzed and compared with the experimental data. The main finding of this study was that the flow velocity remained constant at , whereas the water thickness increased linearly between 1.0 and 4.6 mm with increasing discharge. As a consequence, ring meshes should be supplied with the highest possible discharge to achieve the greatest mitigating effect against blast wave threats.
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Data Availability Statement
The recorded videos and the MATLAB code of this study are available from the corresponding author.
Acknowledgments
Friedrich Muench GmbH + Co KG, Germany, supported this study by providing the ring mesh and the water module. The author is grateful to Sebastian Rößler, B.Sc., who verified the SSIV tracking method diligently in his bachelor’s thesis. Special thanks are given to Dr.-Ing. Lars Rüdiger, Dipl.-Ing. Paul Warnstedt and Prof. Dr.-Ing. Norbert Gebbeken, who approached the author with the original research question and provided ungrudging information about the outcomes of the explosive tests at the Bundeswehr Technical Center in Oberjettenberg/Germany. The author thanks Prof. Dr.-Ing. Andreas Malcherek for his support and many productive discussions. The author thanks the editor and the reviewers for their productive comments and constructive reviews.
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Published In
Journal of Hydraulic Engineering
Volume 147 • Issue 8 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 23, 2020
Accepted: Mar 8, 2021
Published online: May 31, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 31, 2021
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