Air entrainment and scale effects in hydraulic jumps with small froude numbers

Chachereau, Y. and Chanson, H. (2011). Air entrainment and scale effects in hydraulic jumps with small froude numbers. In: Eric Valentine, Colin Apelt, Ball, James, Hubert Chanson, Ron Cox, Robert Ettema, George Kuczera, Martin Lambert, Bruce Melville and Jane Sargison, Balance and Uncertainty: Water in a Changing World - Proceedings of 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering. 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering, Brisbane, QLD, Australia, (2388-2395). 26 June - 1 July 2011.

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Author Chachereau, Y.
Chanson, H.
Title of paper Air entrainment and scale effects in hydraulic jumps with small froude numbers
Conference name 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering
Conference location Brisbane, QLD, Australia
Conference dates 26 June - 1 July 2011
Proceedings title Balance and Uncertainty: Water in a Changing World - Proceedings of 34th IAHR World Congress, 33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering
Place of Publication Barton, ACT, Australia
Publisher Engineers Australia
Publication Year 2011
Sub-type Fully published paper
ISBN 9780858258686
0858258684
Editor Eric Valentine
Colin Apelt
Ball, James
Hubert Chanson
Ron Cox
Robert Ettema
George Kuczera
Martin Lambert
Bruce Melville
Jane Sargison
Start page 2388
End page 2395
Total pages 8
Collection year 2012
Language eng
Formatted Abstract/Summary
The transition from supercritical to subcritical flow is characterised by a strong dissipative
mechanism, a hydraulic jump. In the present study, the air-water properties were investigated
experimentally in hydraulic jumps with relatively small Froude numbers (2.4 < Fr1 < 5.1) and relatively
large Reynolds numbers. A comparative analysis demonstrated that, for hydraulic jumps with Fr1 =
5.1, the void fraction data obtained with Re < 4×104 could not be scaled up to Re = 1×105. Most airwater
flow properties measured with Reynolds numbers up to 1.25×105 could not be extrapolated to
large-size prototype structures without significant scale effects in terms of bubble count rate,
turbulence and bubble chord time distributions. The findings have some major implications of civil,
environmental and sanitary engineering designs, because most hydraulic structures, storm water
systems and water treatment facilities operate with Reynolds numbers larger than 106 to over 108.
Keyword Hydraulic jumps
Air entrainment
Dynamic similarity
Physical modelling
Scale effects
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Created: Sun, 03 Jul 2011, 13:53:37 EST by Hubert Chanson on behalf of School of Civil Engineering