Hydraulic Jump as “Mixing layer”

Hoyt, J. W.; Sellin, R. H. J.

doi:10.1061/(asce)0733-9429(1989)115:12(1607)

Cited by 79 publications

(43 citation statements)

References 9 publications

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“…The analysis of the instantaneous velocity fields obtained through BIV reveals the existence of large coherent vortices consis tent with the mixing layer structure described in the literature for both hydraulic jumps and spilling breakers [23,8,10].…”

Section: Resultssupporting

confidence: 70%

“…Hoyt and Sellin [8] reported that, in their hydraulic jump experiment, large vortices grew linearly with the downstream distance until eventu ally they achieved a maximum size, resulting in a vortex structure analogous to that found in stratified mixing layers, where stratifi cation sets an upper limit to the growth of the overturning regions. They measured the growth rate of the vortices, and thus of the mixing layer, by drawing straight lines tangent to the vortices in still pictures of the flow.…”

Section: Growth Rate Of the Mixing Layermentioning

confidence: 87%

“…Vorticity thickness measured for the five experimental sessions in Table 1. Dashed line corresponds to measurements by [8], dash-dot to [17] and dash-circle to the empirical correlation developed by [5].…”

Section: Convective Velocity Of the Large Eddiesmentioning

confidence: 99%

“…This phenome non was first described by Peregrine and Svendsen [23], who also pointed out that even in flows where the bottom of the channel is close enough to affect the overall flow field, the initial develop ment of this mixing layer may be considered to be free from wall effects. This idea was further developed by Hoyt and Sellin [8], who investigated various similarities between the steady breaking in a hydraulic jump and a free mixing layer between two semi infinite streams. In their experimental investigation, they used high speed photographic techniques to show the existence of large coherent structures that grow linearly beneath the free surface.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of large turbulent structures in a steady breaker

Rodríguez-Rodríguez

Marugán-Cruz

Aliseda

et al. 2011

Experimental Thermal and Fluid Science

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a b s t r a c tThe flow near the leading edge of a steady breaker has been studied experimentally using Bubble Image Velocimetry (BIV) with the aim of characterizing the dynamics of the large eddies responsible for air entrainment. It is well reported in the literature, and confirmed by our measurements of the instanta neous velocity field, that this flow shares some important features with the turbulent shear layer formed between two parallel semi infinite streams with different velocities. Namely, the formation of a periodic array of coherent vortices, the constant convective velocity of those vortices, the linear relation between their size and their downstream position and the self similar structure of both mean velocity profiles and Reynolds shear stresses. Nonetheless, important differences exists between the dynamics of the large eddies in a steady breaker and those in a free shear layer. Particularly, the convective velocity of these large structures is slower in a steady breaker and, consistent with this, their growth rates are larger. A physical interpretation of these differences is provided together with a discussion of their implications. To support our measurements and conclusions, we present a careful analysis of the accuracy of the BIV technique in turbulent flows with large bubbles.

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Section: Resultssupporting

confidence: 70%

Section: Growth Rate Of the Mixing Layermentioning

confidence: 87%

Section: Convective Velocity Of the Large Eddiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of large turbulent structures in a steady breaker

Rodríguez-Rodríguez

Marugán-Cruz

Aliseda

et al. 2011

Experimental Thermal and Fluid Science

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“…In bubbly flows, the turbulent length scales were closely linked with the characteristic sizes of the large-size eddies entrapping air bubbles, as illustrated by series of highspeed photographs (Hoyt and Sellin 1989;Chanson 1997). Herein the integral turbulent length scale L xz characterised the transverse size of the large eddies advecting the air bubbles and air-water packets.…”

Section: Experimental Results: (2) Turbulent Time and Length Scalesmentioning

confidence: 99%

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

Felder

Chanson

2009

Exp Fluids

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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 airwater flow field in large prototype channels. Cross-correlation time scale ( List of symbols

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An Experimental Investigation of Reaeration and Energy Dissipation in Hydraulic Jump

Küçükali

Çokgör

2020

Recent Trends in Environmental Hydraulics

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Hydraulic Jump as “Mixing layer”

Cited by 79 publications

References 9 publications

Dynamics of large turbulent structures in a steady breaker

Dynamics of large turbulent structures in a steady breaker

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

An Experimental Investigation of Reaeration and Energy Dissipation in Hydraulic Jump

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