Results 181 to 190 of about 8,593 (228)

Developing Region in Self-Aerated Flows

Journal of the Hydraulics Division, 1974
The results of two independent research programs are combined. The first investigation was a study of the effect of aeration on the spillway flow of a large dam; the second, a study of the region of developing self-aerated flow in a model flume. Using the model data as a basis, an analysis of the developing region is presented, in which the aerated ...
Robert J. Keller, K. K. Lai, Ian R. Wood
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Inception and Entrainment in Self-Aerated Flows

Journal of the Hydraulics Division, 1970
Inception and entrainment of air in self-aerated open channel flows are studied. For inception to occur surface eddies should leave the free surface and the whole fluid should be turbulent. A criterion for the surface eddy to leave the free surface is formulated using the energy concept.
Thimmaiah Gangadharaiah, Nagar S. Lakshmana Rao, Kyathasandra Seetharamiah   +2 more
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Measurements of Self-Aerated Flow on a Spillway

Journal of the Hydraulics Division, 1981
Measurements are made on the spillway on a 36-m high concrete gravity dam. The measurements include the point of inception, and the velocity distribution and air concentration distribution and bubble size in the developing region of the flow. The measurements show that there appears to be a universal velocity distribution which is independent of the ...
Paul Cain, Ian R. Wood
openaire   +1 more source

Surface waves and roughness in self-aerated supercritical flow

Environmental Fluid Mechanics, 2007
In high-velocity open channel flows, free-surface aeration is commonly observed. The effects of surface waves on the air-water flow properties are tested herein. The study simulates the air-water flow past a fixed-location phase-detection probe by introducing random fluctuations of the flow depth.
Toombes, Luke, Chanson, Hubert
openaire   +4 more sources

Uniform Region of Self‐Aerated Flow

Journal of Hydraulic Engineering, 1983
The measurement of air concentration and velocity obtained in the laboratory are compared with the recent prototype measurement obtained on Aviemore spillway. This comparison suggests that if a characteristic depth such as the depth at which the air concentration is 0.9 chosen then the averaged air concentration over this depth is only a function of ...
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Experiments on Self-Aerated Flow in Open Channels

Journal of the Hydraulics Division, 1958
Measurements of distribution of air concentration in self-aerated flows are presented in this paper. The experiments were made in a rough channel of sand-grain type surface at various slopes and discharges, and the data were used as a basis for study of the mechanism of entrainment of air and to relate the air content and distribution to the ...
Lorenz G. Straub, Alvin G. Anderson
openaire   +1 more source

Self-Aerated Flow Characteristics in Wall Region

Journal of the Hydraulics Division, 1971
Characteristics of self-aerated flows in the wall region are studied. The distribution of velocity and air concentration in the wall turbulent zone is studied by dividing the wall turbulent zone into an inner and outer region according to the eddy viscosity distribution. It is shown that the inner region ceases to exist under certain conditions.
Nagar S. Lakshmana Rao, Thimmaiah Gangadharaiah   +1 more
openaire   +1 more source

Hydrodynamic design of self-aerating flotation machines

Minerals Engineering, 2000
This paper reviews the hydrodynamic design of self-aerating flotation machines. The important criteria relating to mixing, solids suspension, air transfer, and power are discussed. Data are presented for all the standard sizes of WEMCO brand machines, showing the continuing use of hydrodynamic criteria in the design of those machines.
M.G. Nelson, D. Lelinski
openaire   +1 more source

Simulation of self-aerated flows by switching interface closures

Journal of Hydraulic Research, 2020
This work presents a numerical study of a skimming flow regime in a stepped spillway structure, which is a complex two-phase flow with self-aeration phenomenon.
Guibu Pereira, Gabriel, Dufresne, Matthieu, Wertel, Jonathan, Vazquez, José   +3 more
openaire   +1 more source

Indexing Gas Transfer in Self‐Aerated Flows

Journal of Environmental Engineering, 1990
An indexing relationship, used to index and directly compare measurements, is developed for liquid phase‐controlled gas transfer in self‐aerated flows from theoretical considerations. The indexing relation is shown to describe temperature effects as well as existing equations that use fitted coefficients.
John S. Gulliver, John R. Thene, Alan J. Rindels   +2 more
openaire   +1 more source