Turbulence and aeration in hydraulic jumps: free-surface fluctuation and integral turbulent scale measurements

Gangfu Zhang, Hang Wang and Chanson, Hubert (2013) Turbulence and aeration in hydraulic jumps: free-surface fluctuation and integral turbulent scale measurements. Environmental Fluid Mechanics, 13 2: 189-204. doi:10.1007/s10652-012-9254-3

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Author Gangfu Zhang
Hang Wang
Chanson, Hubert
Title Turbulence and aeration in hydraulic jumps: free-surface fluctuation and integral turbulent scale measurements
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
Publication date 2013-04-01
Year available 2012
Sub-type Article (original research)
DOI 10.1007/s10652-012-9254-3
Open Access Status File (Author Post-print)
Volume 13
Issue 2
Start page 189
End page 204
Total pages 16
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2014
Language eng
Abstract In an open channel, a change from a supercritical to subcritical flow is a strong dissipative process called a hydraulic jump. Herein some new measurements of free-surface fluctuations of the impingement perimeter and integral turbulent time and length scales in the roller are presented with a focus on turbulence in hydraulic jumps with a marked roller. The observations highlighted the fluctuating nature of the impingement perimeter in terms of both longitudinal and transverse locations. The results showed further the close link between the production and detachment of large eddies in jump shear layer, and the longitudinal fluctuations of the jump toe. They highlighted the importance of the impingement perimeter as the origin of the developing shear layer and a source of vorticity. The air–water flow measurements emphasised the intense flow aeration. The turbulent velocity distributions presented a shape similar to a wall jet solution with a marked shear layer downstream of the impingement point. The integral turbulent length scale distributions exhibited a monotonic increase with increasing vertical elevation within 0.2 < Lz/d1 < 0.8 in the shear layer, where Lz is the integral turbulent length scale and d1 the inflow depth, while the integral turbulent time scales were about two orders of magnitude smaller than the period of impingement position longitudinal oscillations.
Keyword Hydrualic jumps
Free surface fluctuations
integral turbulent time scales
integral turbulent length scales
Impingement perimeter
Jump toe
Physical measurememts
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes The original publication is available at www.springerlink.com

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Thu, 14 Mar 2013, 09:56:37 EST by Hubert Chanson on behalf of School of Civil Engineering