Experimental Analysis of Froude Number Effect on Air Entrainment in the Hydraulic Jump

Gualtieri, Carlo and Chanson, Hubert (2007) Experimental Analysis of Froude Number Effect on Air Entrainment in the Hydraulic Jump. Environmental Fluid Mechanics, 7 3: 217-238. doi:10.1007/s10652-006-9016-1

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Author Gualtieri, Carlo
Chanson, Hubert
Title Experimental Analysis of Froude Number Effect on Air Entrainment in the Hydraulic Jump
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
Publication date 2007-06-13
Year available 2007
Sub-type Article (original research)
DOI 10.1007/s10652-006-9016-1
Open Access Status File (Author Post-print)
Volume 7
Issue 3
Start page 217
End page 238
Total pages 22
Editor Cushman-Roisin, B.
Place of publication Dordrecht
Publisher Springer
Language eng
Subject 240000 Physical Sciences
240500 Classical Physics
240502 Fluid Physics
290000 Engineering and Technology
290800 Civil Engineering
290802 Water and Sanitary Engineering
291800 Interdisciplinary Engineering
291803 Turbulent Flows
291802 Heat and Mass Transfer Operations
260000 Earth Sciences
310000 Architecture, Urban Environment and Building
300000 Agricultural, Veterinary and Environmental Sciences
300100 Soil and Water Sciences
770400 Coastal and Estuarine Environment
C1
Abstract A hydraulic jump is characterized by strong energy dissipation and mixing, large-scale turbulence, air entrainment, waves and spray. Despite recent pertinent studies, the interaction between air bubbles diffusion and momentum transfer is not completely understood. The objective of this paper is to present experimental results from new measurements performed in rectangular horizontal flume with partially-developed inflow conditions. The vertical distributions of void fraction and air bubbles count rate were recorded for inflow Froude number Fr1 in the range from 5.2 to 14.3. Rapid detrainment process was observed near the jump toe, whereas the structure of the air diffusion layer was clearly observed over longer distances. These new data were compared with previous data generally collected at lower Froude numbers. The comparison demonstrated that, at a fixed distance from the jump toe, the maximum void fraction Cmax increases with the increasing Fr1. The vertical locations of the maximum void fraction and bubble count rate were consistent with previous studies. Finally, an empirical correlation between the upper boundary of the air diffusion layer and the distance from the impingement point was provided.
Keyword Environmental Hydraulics
Hydraulic Jump
Physical Modeling
Air Entrainment
Water Resources
Froude Number Effect
Oceanography
Meteorology & Atmospheric Sciences
Mechanics
Environmental Sciences
Air Diffusion Layer
Developing Flow Region
Plunging Jets
Bubble Entrainment
Water
Q-Index Code C1
Institutional Status UQ
Additional Notes The full bibliographic details are : GUALTIERI, C., and CHANSON, H. (2007). "Experimental Analysis of Froude Number Effect on Air Entrainment in the Hydraulic Jump." Environmental Fluid Mechanics, Vol. 5, No. 3, pp. 217-238 (DOI:10.1007/s10654-006-9016-1) (1567-7419 [Print] 1573-1510 [Online]).

 
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Created: Wed, 13 Jun 2007, 10:48:54 EST by Hubert Chanson on behalf of School of Engineering