Turbulence, dynamic similarity and scale effects in high-velocity free-surface flows above a stepped chute

Felder, Stefan and Chanson, Hubert (2009) Turbulence, dynamic similarity and scale effects in high-velocity free-surface flows above a stepped chute. Experiments in Fluids, 47 1: 1-18. doi:10.1007/s00348-009-0628-3

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Author Felder, Stefan
Chanson, Hubert
Title Turbulence, dynamic similarity and scale effects in high-velocity free-surface flows above a stepped chute
Journal name Experiments in Fluids   Check publisher's open access policy
ISSN 0723-4864
1432-1114
Publication date 2009-07
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s00348-009-0628-3
Open Access Status File (Author Post-print)
Volume 47
Issue 1
Start page 1
End page 18
Total pages 18
Editor C Tropea
Noel T Clemens
Place of publication Berlin, Germany
Publisher Springer
Collection year 2010
Language eng
Subject 090509 Water Resources Engineering
C1
970109 Expanding Knowledge in Engineering
Abstract In high-velocity free-surface flows, air entrainment is common through the interface, and intense interactions take place between turbulent structures and entrained bubbles. Two-phase flow properties were measured herein in high-velocity open channel flows above a stepped chute. Detailed turbulence measurements were conducted in a large-size facility, and a comparative analysis was applied to test the validity of the Froude and Reynolds similarities. The results showed consistently that the Froude similitude was not satisfied using a 2:1 geometric scaling ratio. Lesser number of entrained bubbles and comparatively greater bubble sizes were observed at the smaller Reynolds numbers, as well as lower turbulence levels and larger turbulent length and time scales. The results implied that small-size models did underestimate the rate of energy dissipation and the aeration efficiency of prototype stepped spillways for similar flow conditions. Similarly a Reynolds similitude was tested. The results showed also some significant scale effects. However a number of self-similar relationships remained invariant under changes of scale and confirmed the analysis of Chanson and Carosi (Exp Fluids 42:385-401, 2007). The finding is significant because self-similarity may provide a picture general enough to be used to characterise the air– water flow field in large prototype channels.
Keyword Turbulence
Dynamic similarity
Scale effects
Physical modelling
Free-surface flows
high-velocity flows
Stepped spillways
Stepped chutes
Free-surface aeration
Air bubble entrainment
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes The full bibliographic details are : FELDER, S., and CHANSON, H. (2009). "Turbulence, Dynamic Similarity and Scale Effects in High-Velocity Free-Surface Flows above a Stepped Chute." Experiments in Fluids, Vol. 47, No. 1, pp. 1-18 (DOI: 10.1007/s00348-009-0628-3) (ISSN 0723-4864).

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Civil Engineering Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 26 Jun 2009, 09:20:03 EST by Hubert Chanson on behalf of School of Civil Engineering