Experimental study of the air–water shear flow in a hydraulic jump

Chanson, Hubert; Brattberg, T.

doi:10.1016/s0301-9322(99)00016-6

Cited by 184 publications

(188 citation statements)

References 10 publications

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“…The maximum air content in the air diffusion layer decreased with distance from the jump toe and the data are believed to follow closely both power law and exponential decay functions as shown by Chanson and Brattberg [6] and Murzyn et al [7]. The corresponding decay correlations are: where C 1p , C 2p , C 1e and C 2e are the numerical coefficients of power law and exponential decay functions.…”

Section: Froude Number Effect On Air-water Flow Propertiessupporting

confidence: 58%

“…4 were compared with those collected in previous experiments using the same facility [4,6]. Data for Fr 1 = 5.02, Fr 1 = 5.66 and Fr 1 = 8.06 were taken from [4], whereas data for Fr 1 = 6.33 and Fr 1 = 8.48 were taken from [6].…”

Section: Experimental Results Comparison With Literature Datamentioning

confidence: 99%

“…3). The advective diffusion layer did not coincide with the momentum shear layer [6,15,18]. This non-coincidence illustrates a double diffusion process whereby air bubbles and momentum diffuse at different rates and in different manner.…”

Section: Basic Patterns Of Air-water Flow Properties In the Hydraulicmentioning

confidence: 88%

“…[6], in vertical supported plunging jets [18] and in vertical circular plunging jets [20]. These studies suggested that this finding was related to a double diffusion process whereby vorticity and air bubbles diffuse at a different rate and in a different manner downstream of the impingement point.…”

Section: Froude Number Effect On Air-water Flow Propertiesmentioning

confidence: 90%

“…Mossa and Tolve [5] recorded instantaneous properties of bubbly flow structures using an imaging technique. Chanson and Brattberg [6] documented vertical distributions of void fractions, bubble count-rates and air-water velocities in the hydraulic jump with inflow Froude numbers Fr 1 of 6.33 and 8.48. Murzyn et al [7] measured detailed air-water flow properties in an hydraulic jump with inflow Froude numbers from 2.0 to 4.8.…”

Section: Forewordmentioning

confidence: 99%

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Experimental analysis of Froude number effect on air entrainment in the hydraulic jump

Gualtieri

Chanson

2007

Environ Fluid Mech

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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 a rectangular horizontal flume with partially developed inflow conditions. The vertical distributions of the void fraction and the air bubbles count rate were recorded for inflow Froude number Fr 1 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 C max increases with the increasing Fr 1 . 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 derived.

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Section: Froude Number Effect On Air-water Flow Propertiessupporting

confidence: 58%

Section: Experimental Results Comparison With Literature Datamentioning

confidence: 99%

Section: Basic Patterns Of Air-water Flow Properties In the Hydraulicmentioning

confidence: 88%

Section: Froude Number Effect On Air-water Flow Propertiesmentioning

confidence: 90%

Section: Forewordmentioning

confidence: 99%

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Experimental analysis of Froude number effect on air entrainment in the hydraulic jump

Gualtieri

Chanson

2007

Environ Fluid Mech

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Modeling air entrainment and transport in a hydraulic jump using two-fluid RANS and DES turbulence models

Oberai

Lahey

et al. 2011

Heat Mass Transfer

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Experimental assessment of scale effects affecting two-phase flow properties in hydraulic jumps

Murzyn

Chanson

2008

Exp Fluids

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A hydraulic jump is the rapid transition from a supercritical to subcritical free-surface flow. It is characterised by strong turbulence and air bubble entrainment. New air-water flow properties were measured in hydraulic jumps with partially developed inflow conditions. The data set together with the earlier data of Chanson (Air bubble entrainment in hydraulic jumps. Similitude and scale effects, 119 p, 2006) yielded similar experiments conducted with identical inflow Froude numbers Fr 1 = 5 and 8.5, but Reynolds numbers between 24,000 and 98,000. The comparative results showed some drastic scale effects in the smaller hydraulic jumps in terms of void fraction, bubble count rate and bubble chord time distributions. The present comparative analysis demonstrated quantitatively that dynamic similarity of two-phase flows in hydraulic jumps cannot be achieved with a Froude similitude. In experimental facilities with Reynolds numbers up to 10 5 , some viscous scale effects were observed in terms of the rate of entrained air and air-water interfacial area. List of symbols

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Experimental study of the air–water shear flow in a hydraulic jump

Cited by 184 publications

References 10 publications

Experimental analysis of Froude number effect on air entrainment in the hydraulic jump

Experimental analysis of Froude number effect on air entrainment in the hydraulic jump

Modeling air entrainment and transport in a hydraulic jump using two-fluid RANS and DES turbulence models

Experimental assessment of scale effects affecting two-phase flow properties in hydraulic jumps

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