2009
DOI: 10.1007/s00348-009-0628-3
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Turbulence, dynamic similarity and scale effects in high-velocity free-surface flows above a stepped chute

Abstract: 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 w… Show more

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Cited by 74 publications
(58 citation statements)
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“…On the flat stepped chute, the turbulence level distributions were qualitatively and quantitatively comparable to earlier findings on flat stepped spillways with maximum values of up to 150% in the intermediate flow region (Carosi andChanson 2008, Felder andChanson 2009). Some typical distributions of turbulence intensity Tu are illustrated in Figure 7 for all experimental configurations.…”
supporting
confidence: 85%
“…On the flat stepped chute, the turbulence level distributions were qualitatively and quantitatively comparable to earlier findings on flat stepped spillways with maximum values of up to 150% in the intermediate flow region (Carosi andChanson 2008, Felder andChanson 2009). Some typical distributions of turbulence intensity Tu are illustrated in Figure 7 for all experimental configurations.…”
supporting
confidence: 85%
“…For R ≥ 4×10 4 at a given section of H s /d c (Fig.1) in the nonuniform flow region, a Froude similitude with Eq. (1) may be applied specifically for the magnitude and distribution of C and u/u 0.9 (Takahashi and Ohtsu 2013) except in terms of turbulent properties and bubble sizes (Pfister andChanson 2012, Felder andChanson 2009a). Thus, experimental data were collected in the range of 4×10 4 ≤ R ≤ 9×10 4 to satisfy these limits.…”
Section: Experiments and Experimental Set-upmentioning
confidence: 99%
“…In a free-surface skimming flow down a stepped spillway, a dimensional analysis gives a series of dimensionless relationships between the two-phase flow properties at a dimensionless location along the chute and the channel characteristics, inflow properties and fluid properties (Chanson 2004, Chanson and Gonzalez 2005, Felder and Chanson 2009b): …”
Section: Presentationmentioning
confidence: 99%