Interaction between free-surface aeration and total pressure on a stepped chute

Zhang, Gangfu and Chanson, Hubert (2016) Interaction between free-surface aeration and total pressure on a stepped chute. Experimental Thermal and Fluid Science, 74 368-381. doi:10.1016/j.expthermflusci.2015.12.011

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Author Zhang, Gangfu
Chanson, Hubert
Title Interaction between free-surface aeration and total pressure on a stepped chute
Journal name Experimental Thermal and Fluid Science   Check publisher's open access policy
ISSN 0894-1777
Publication date 2016
Sub-type Article (original research)
DOI 10.1016/j.expthermflusci.2015.12.011
Open Access Status File (Author Post-print)
Volume 74
Start page 368
End page 381
Total pages 14
Place of publication Philadelphia, PA, United States
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
Stepped chutes have been used as flood release facilities for several centuries. Key features are the intense free-surface aeration of both prototype and laboratory systems and the macro-roughness caused by the stepped cavities. Herein the air bubble entrainment and turbulence were investigated in a stepped spillway model, to characterise the interplay between air bubble entrainment and turbulence, and the complicated interactions between mainstream flow and cavity recirculation motion. New experiments were conducted in a large steep stepped chute (θ=45°, h=0.10m, W=0.985m). Detailed two-phase flow measurements were conducted for a range of discharges corresponding to Reynolds numbers between 2×105 and 9×105. The total pressure, air-water flow and turbulence properties were documented systematically in the mainstream and cavity flows. Energy calculations showed an overall energy dissipation of about 50% regardless of the discharge. Overall the data indicated that the bottom roughness (i.e. stepped profile) was a determining factor on the energy dissipation performance of the stepped structure, as well as on the longitudinal changes in air-water flow properties. Comparative results showed that the cavity aspect ratio, hence the slope, has a marked effect on the residual energy.
Keyword Free-sirface aeration
Stepped spillways
Total pressure
physical modelling
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Preprint of ZHANG, G., and CHANSON, H. (2016). "Interactions between Free-surface Aeration and Total Pressure on a Stepped Chute." Experimental Thermal and Fluid Science, Vol. 74, pp. 368-381 (DOI: 10.1016/j.expthermflusci.2015.12.011) (ISSN 0894-1777).

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Created: Fri, 22 Jan 2016, 05:26:35 EST by Hubert Chanson on behalf of School of Civil Engineering