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Laboratory Study of Secondary Flow in an Open Channel Bend by Using PIV

1
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(4), 659; https://doi.org/10.3390/w11040659
Received: 7 March 2019 / Revised: 27 March 2019 / Accepted: 28 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Advances in Hydraulics and Hydroinformatics)
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Abstract

The present paper aims to gain deeper insight into the evolution of secondary flows in open channel bend. A U-shaped open channel with long straight inflow/outflow reaches was used for experiments. Efforts were made to precisely specify flow conditions and to achieve high precision measurement of quasi-three-dimensional velocities with a multi-pass, two-dimensional PIV (Particle Image Velocimetry) method. The experimental results show that the flow begins to redistribute before entering the bend and it takes a long distance to re-establish to uniform conditions after exiting the bend. Complex secondary flow patterns were found to be present in the bend, as well as in the straight inflow and outflow reaches. A “self-breaking” (process was identified, which correlates stream-wise velocity with the intensity of flow circulation. View Full-Text
Keywords: open channel bend; secondary flow; velocity distribution; PIV open channel bend; secondary flow; velocity distribution; PIV
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bai, R.; Zhu, D.; Chen, H.; Li, D. Laboratory Study of Secondary Flow in an Open Channel Bend by Using PIV. Water 2019, 11, 659.

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