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5 results on '"spillway bottom"'

1. Advances in Hydraulics and Hydroinformatics Volume 2.

Author

Zhou, Jianguo, Zhang, Jianmin, Peng, Yong, Borthwick, Alistair, and Zhou, Jianguo

Subjects
History of engineering & technology, chute aerator, spillway bottom, air concentration, air bubble frequency, air bubble chord length, evolution of precipitation, model simulation, information entropy theory, desert-oasis areas, Tarim Basin, gravity wave model, dam-break flood, image processing technology, experimental study, cavitation bubble, high-speed photography, impact pressure, micro-jet, Ningxia-Inner Mongolia, Yellow River, riverbank collapse, BSTEM model, flood &amp, dry season, sediment transport, finite crest length weir, FGP (flaring gate pier), discharge coefficient, subcritical flow, river flow modeling, sediment transport simulation, automation of flow modeling, HEC-RAS controller, python scripting, three-dimensional aerator, multi-horizontal-submerged jets, energy dissipation, near-field vibration, fluctuating pressure, gate-opening modes, collapse near a wall, double cavitation bubble, tilt distribution cavitation, parallel cavitation, pseudopotential lattice Boltzmann model, numerical simulation, pooled stepped spillway, pool weir, flow property, surface-piercing propeller, artificial ventilation, hydrodynamic performance, LES-VOF method, flow-induced vibration, plane gate, numerical analysis, bridge scour, submerged flow, physical hydraulic modeling, ski-jump flow, spillway outlet, jet trajectory, experimental model, rainfall intensity distribution, two water jets, collision in air, Gaussian distribution, trajectory line, clogging, drip irrigation, flushing, particle size distribution, sediments, submerged jets, aerated flow, plunge pool, trapezoidal cross-section, U-shaped channel, radius-to-width ratio, slope coefficient, hydraulic characteristics, hydraulic jump, Froude number, stilling basin with shallow-water cushion (SBSWC), large eddy simulation, best depth, CFD-DEM coupling, hydrocyclone, particle shape, particle size, water and sediment separation, stepped dropshaft, flow region, central angle of step, free surface measurement, optical motion capturing, tank test, wave gauge, sloshing, offset jet, potential core, decay rate, k-ε model, abutment, overtopping flow, pressure flow, scour and velocity field, Y-shaped confluence channel, non-submerged rigid vegetation, longitudinal velocity, secondary flow, turbulent kinetic energy, wetland, lattice Boltzmann method, shallow lake, drag force, water-saving irrigation development level, Sichuan province, TOPSIS method, experiment, particle image velocimetry, 3D confined wall jet, mean flow, multiple bubble collapse, pressure wave energy, energy conversion rate, consistent particle method, solitary wave, submerged breakwater, breaking wave, vortex, free surface flow, embankment weir, bridge piers, turbulence, CFD, sediment, transforming mechanism, open channel bend, velocity distribution, PIV, hyporheic exchange, surface−groundwater flow process, influencing factors, orthogonal tests, sensitivity analysis, linearly moved irrigation system, application depth, moving speed, uniformity coefficient, tidal discharge, phase difference, tidal channel junction, flow division, fluvial acoustic tomography, wavelet analysis, DEM, hydrodynamic modelling, river bathymetry, floods, Bathy-supp, coherent vortex structure, backward-facing step, synchronized PIV, separation and reattachment, free shear layer, vortical evolution
Abstract

Summary: This Special Issue reports on recent research trends in hydraulics, hydrodynamics, and hydroinformatics, and their novel applications in practical engineering. The Issue covers a wide range of topics, including open channel flows, sediment transport dynamics, two-phase flows, flow-induced vibration and water quality. The collected papers provide insight into new developments in physical, mathematical, and numerical modelling of important problems in hydraulics and hydroinformatics, and include demonstrations of the application of such models in water resources engineering.

2. Development of Bubble Characteristics on Chute Spillway Bottom

Author

Ruidi Bai, Chang Liu, Bingyang Feng, Shanjun Liu, and Faxing Zhang

Subjects
chute aerator, spillway bottom, air concentration, air bubble frequency, air bubble chord length, Hydraulic engineering, TC1-978, Water supply for domestic and industrial purposes, TD201-500
Abstract

Chute aerators introduce a large air discharge through air supply ducts to prevent cavitation erosion on spillways. There is not much information on the microcosmic air bubble characteristics near the chute bottom. This study was focused on examining the bottom air-water flow properties by performing a series of model tests that eliminated the upper aeration and illustrated the potential for bubble variation processes on the chute bottom. In comparison with the strong air detrainment in the impact zone, the bottom air bubble frequency decreased slightly. Observations showed that range of probability of the bubble chord length tended to decrease sharply in the impact zone and by a lesser extent in the equilibrium zone. A distinct mechanism to control the bubble size distribution, depending on bubble diameter, was proposed. For bubbles larger than about 1–2 mm, the bubble size distribution followed a—5/3 power-law scaling with diameter. Using the relationship between the local dissipation rate and bubble size, the bottom dissipation rate was found to increase along the chute bottom, and the corresponding Hinze scale showed a good agreement with the observations.

Published
2018
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4. Development of Bubble Characteristics on Chute Spillway Bottom

Author

Bingyang Feng, Ruidi Bai, Chang Liu, Faxing Zhang, and Shanjun Liu

Subjects
lcsh:Hydraulic engineering, Bubble, 0208 environmental biotechnology, Geography, Planning and Development, 02 engineering and technology, Aquatic Science, Biochemistry, lcsh:Water supply for domestic and industrial purposes, lcsh:TC1-978, Scaling, Water Science and Technology, Spillway, lcsh:TD201-500, Impact zone, Mechanics, Dissipation, chute aerator, 020801 environmental engineering, air bubble chord length, spillway bottom, air concentration, air bubble frequency, Cavitation erosion, Air bubble, Aeration, Geology
Abstract

Chute aerators introduce a large air discharge through air supply ducts to prevent cavitation erosion on spillways. There is not much information on the microcosmic air bubble characteristics near the chute bottom. This study was focused on examining the bottom air-water flow properties by performing a series of model tests that eliminated the upper aeration and illustrated the potential for bubble variation processes on the chute bottom. In comparison with the strong air detrainment in the impact zone, the bottom air bubble frequency decreased slightly. Observations showed that range of probability of the bubble chord length tended to decrease sharply in the impact zone and by a lesser extent in the equilibrium zone. A distinct mechanism to control the bubble size distribution, depending on bubble diameter, was proposed. For bubbles larger than about 1&ndash, 2 mm, the bubble size distribution followed a&mdash, 5/3 power-law scaling with diameter. Using the relationship between the local dissipation rate and bubble size, the bottom dissipation rate was found to increase along the chute bottom, and the corresponding Hinze scale showed a good agreement with the observations.

Published
2018
Full Text
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5. Development of Bubble Characteristics on Chute Spillway Bottom.

Author

Bai, Ruidi, Liu, Chang, Feng, Bingyang, Liu, Shanjun, and Zhang, Faxing

Subjects
CAVITATION, WATER aeration, AIRDROP, ENERGY dissipation, SPILLWAYS
Abstract

Chute aerators introduce a large air discharge through air supply ducts to prevent cavitation erosion on spillways. There is not much information on the microcosmic air bubble characteristics near the chute bottom. This study was focused on examining the bottom air-water flow properties by performing a series of model tests that eliminated the upper aeration and illustrated the potential for bubble variation processes on the chute bottom. In comparison with the strong air detrainment in the impact zone, the bottom air bubble frequency decreased slightly. Observations showed that range of probability of the bubble chord length tended to decrease sharply in the impact zone and by a lesser extent in the equilibrium zone. A distinct mechanism to control the bubble size distribution, depending on bubble diameter, was proposed. For bubbles larger than about 1–2 mm, the bubble size distribution followed a—5/3 power-law scaling with diameter. Using the relationship between the local dissipation rate and bubble size, the bottom dissipation rate was found to increase along the chute bottom, and the corresponding Hinze scale showed a good agreement with the observations. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

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