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Self-aeration development and fully cross-sectional air diffusion in high-speed open channel flows
Wei, W. Xu, W. Deng, J. Guo, Yakun
Wei, W.
Xu, W.
Deng, J.
Guo, Yakun
Publication Date
2022
End of Embargo
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© 2022 International Association for Hydro-Environment Engineering and Research
© 2022 Taylor & Francis. The Version of Record of this manuscript has been published
and is available in Journal of Hydraulic Research, 7th Feb 2022, https://doi.org/10.1080/00221686.2021.2004250.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2021-11-03
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Department
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Additional title
Abstract
Self-aeration in open channel flows occurs owing to free surface air entrainment. Self-aeration development and fully cross-sectional distribution of air concentration are not thoroughly understood. In the present study, an analytical solution for the averaged cross-sectional air concentration in the gradually varying region is established using a simplified mechanism of free surface air entrainment. For a fully cross-sectional distribution of air concentration affected by the channel bottom, a model of a diffusion region without wall restraint is proposed, and two situations are classified based on averaged cross-sectional air concentration. Good agreement between measured data and calculations is obtained, and the computational accuracy of the air concentration distribution near the wall is improved. The results reveal that the channel slope determines the air entrainment quantity, while water flow discharge determines the self-aeration evolution distance. The solutions for the averaged cross-sectional air concentration and the effect of the bottom wall on air diffusion promote air–water flow applications in hydraulic engineering practices.
Version
Accepted manuscript
Citation
Wangru W, Weilin X, Jun, D et al (2022) Self-aeration development and fully cross-sectional air diffusion in high-speed open channel flows. Journal of Hydraulic Research. 60(3): 445-459.
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Article