Experimental measurements of velocity and pressure distributions on a large broad-crested weir

Gonzalez, Carlos A.; Chanson, Hubert

doi:10.1016/j.flowmeasinst.2007.05.005

Cited by 49 publications

(32 citation statements)

References 10 publications

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“…The present data trend differed from the data of GONZALEZ and CHANSON (2007) who observed the occurrence of irregular corner eddies next to the sidewalls immediately upstream of the vertical upstream wall, associated with instabilities affecting the overflow motion. In the present study, the inflow conditions were very smooth and no irregular vortice generation was observed.…”

Section: Discussioncontrasting

confidence: 99%

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

Felder

Chanson

2012

J. Irrig. Drain Eng.

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Basic experiments were conducted on a large-size broad-crested weir with a rounded corner. Detailed free-surface, velocity and pressure measurements were performed for a range of flow conditions. The results showed the rapid flow distribution at the upstream end of the weir, as well as next to the weir brink at large flow rates. The flow properties above the crest were analysed taking into account the non-uniform velocity and non-hydrostatic pressure distributions. Introducing some velocity and pressure correction coefficients, it is shown that critical flow conditions were achieved above the weir crest for 0.1 < x/L crest < 1. The velocity measurements highlighted a developing boundary layer. The data differed from the smooth turbulent boundary layer theory, although the present results were consistent with earlier studies. On average the boundary stress was about  o /(×g×H 1 ) ~ 0.0015 to 0.0025.

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Section: Discussioncontrasting

confidence: 99%

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

Felder

Chanson

2012

J. Irrig. Drain Eng.

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“…The water discharge was measured from the upstream head above the crest, and the head-discharge relationship was checked with detailed velocity distribution measurements on the crest itself (Gonzalez and Chanson 2007). The two-phase flow properties were measured with either a single-tip conductivity probe, an array of two identical single-tip conductivity probes or a double-tip conductivity probe.…”

Section: Experimental Apparatus and Proceduresmentioning

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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“…This is illustrated in Fig. 3 for which the details of the data sets are summarized in Table 1 (Bazin 1896; Gonzalez and Chanson 2007;Sargison and Percy 2009). Fig.…”

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“…2 illustrates the effect of the relative weir height P/ HI and of the upstream comer rounding on the streamline pattern for a rectangular broad-crested weir with vertical upstream wall. All the sketches are drawn for the same upstream (1896), Gonzalez and Chanson (2007), and Sarginson and Percy (2009) head above crest. With a square-edged upstream comer, separation takes place immediately downstream and a recirculation bubble develops (Mos 1972).…”

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confidence: 99%

Experimental measurements of velocity and pressure distributions on a large broad-crested weir

Cited by 49 publications

References 10 publications

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

Free-Surface Profiles, Velocity and Pressure Distributions on a Broad-Crested Weir: A Physical Study

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

Discussion of “Hydraulics of Broad-Crested Weirs with Varying Side Slopes” by J. E. Sargison and A. Percy

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