Bubble Entrainment, Spray and Splashing at Hydraulic Jumps

Chanson, Hubert (2006) Bubble Entrainment, Spray and Splashing at Hydraulic Jumps. Journal of Zhejiang University SCIENCE A, 7 8: 1396-1405. doi:10.1631/jzus.2006.A1396

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Author Chanson, Hubert
Title Bubble Entrainment, Spray and Splashing at Hydraulic Jumps
Journal name Journal of Zhejiang University SCIENCE A   Check publisher's open access policy
ISSN 1673-565X
Publication date 2006-01-01
Sub-type Article (original research)
DOI 10.1631/jzus.2006.A1396
Open Access Status File (Author Post-print)
Volume 7
Issue 8
Start page 1396
End page 1405
Total pages 10
Editor Wei Yang
Place of publication Hangzhou, China
Publisher Zhejiang University Press
Language eng
Subject 260502 Surfacewater Hydrology
240502 Fluid Physics
240000 Physical Sciences
291100 Environmental Engineering
290000 Engineering and Technology
291899 Interdisciplinary Engineering not elsewhere classified
291800 Interdisciplinary Engineering
300100 Soil and Water Sciences
291803 Turbulent Flows
240500 Classical Physics
260500 Hydrology
290802 Water and Sanitary Engineering
300105 Applied Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
291199 Environmental Engineering not elsewhere classified
290800 Civil Engineering
Abstract The sudden transition from a high-velocity, supercritical open channel flow into a slow-moving sub-critical flow is a hydraulic jump. Such a flow is characterised by a sudden rise of the free-surface, with some strong energy dissipation and air entrainment, waves and spray. New two-phase flow measurements were performed in the developing flow region using a large-size facility operating at large Reynolds numbers. The experimental results demonstrated the complexity of the flow with a developing mixing layer in which entrained bubbles are advected in a high shear stress flow. The relationship between bubble count rates and void fractions was non-unique in the shear zone, supporting earlier observations of some form of double diffusion process between momentum and air bubbles. In the upper region, the flow consisted primarily of water drops and packets surrounded by air. Visually significant pray and splashing were significant above the jump roller. The present study is the first comprehensive study detailing the two-phase flow properties of both the bubbly and spray regions of hydraulic jumps, a first step towards understanding the interactions between bubble entrainment and droplet ejection processes.
Keyword hydraulic jump
air bubble entrainment
spray and splashing
physical modelling
particle chord time distributions
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Q-Index Code C1
Additional Notes CHANSON, H. (2006). "Bubble Entrainment, Spray and Splashing at Hydraulic Jumps." Journal of Zhejiang University SCIENCE A, Vol. 7, No. 8, pp. 1396-1405 (ISSN 1009-3095 (print version); 1862-1775 (electronic version)).

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Sub-type: Article (original research)
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Created: Mon, 31 Jul 2006, 10:00:00 EST by Hubert Chanson on behalf of Library Corporate Services