Publications related to High velocity aerated flow on stepped chutes with macro-roughness elements

ACOUSTIC RESONNANCE IN CAVITATION FREE AND CAVITATING FLOWS

François Avellan, Sébastien Alligné, Nicolas Ruchonnet

At part load operation of Francis turbine, the swirl in the draft tube leads to flow instability known as vortex breakdown. This flow instability can interact with the rest of the hydraulic circuit through axially propagating plane-waves. Moreover, at low ...

2009

Transitional cylindrical swirling flow in presence of a flat free surface

Roland Bouffanais, David Lo Jacono

This article is devoted to the study of an incompressible viscous flow of a fluid partly enclosed in a cylindrical container with an open top Surface and driven by the constant rotation of the bottom wall. Such type of flows belongs to a group of recircula ...

2009

Dissipation of boundary-induced flow disturbances in cylindrical soil columns

David Andrew Barry

Laboratory soil column experiments, often involving steady flow, have a long and enduring history in hydrology and soil science. Typically, analyses of laboratory column data assume that the flow is both steady and uniform within the soil column. However, ...

2009

Study and Numerical Simulation of Sediment Transport in Free-Surface Flow

The flow after the rupture of a dam on an inclined plane of arbitrary slope, and the induced transport of non-cohesive sediment, is analysed using the shallow-water approximation. An asymptotic (analytical) solution is presented for the flow hydrodynamics, ...

University of Malaga, Spain2008

Aerated flows on stepped chutes with macro-roughness elements, Part II : Energy dissipation

Anton Schleiss, Stéphanie Joëlle André

An experimental research of flow on different systems of stepped overlays for 18.6 degrees and 30 degrees slopes was conducted. In addition to define flow characteristics (Part I), the study highlighted the existence of an homogeneous aerated flow in which ...

2008

Aerated flows on stepped chutes with macro-roughness elements - Part I: Hydraulic characteristics

Anton Schleiss, Stéphanie Joëlle André

Uncontrolled overtopping during flood events can endanger embankment dams. Erosion of the downstream slope and scouring of its toe due to the high energy of the overflow can lead to breach formation and complete failure. Solution to overcome these dangerou ...

2008

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Ismail Albayrak

River and open-channel flows are free surface boundary layer flows with complex 3D, large-scale, turbulent structures. The study of 2D and 3D large-scale turbulent flow structures is a great challenge for physicists, mathematicians and engineers from such ...

EPFL2008

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Albert Renken, Lioubov Kiwi, Anne-Laure Dessimoz

The flow of two immiscible fluids was investigated in rectangular glass microchannels with equivalent diameters of 269 and 400

\mu m

. Deionised water, dyed toluene and hexane were selected as probe fluids. Flow patterns were obtained for Y- and T-junction ...

2008

Improvement of Acoustic Doppler Velocimetry in steady and unsteady turbulent open-channel flows by means of seeding with hydrogen bubbles

Anton Schleiss, Giovanni De Cesare, Koen Blanckaert, Tobias Meile

Velocimetry is used in various fields of research. In hydraulics, Ultrasonic Velocimetry based on the Doppler Shift effect can accurately resolve the quasi-instantaneous flow field [Takeda Y. Velocity profile measurement by Ultrasonic Doppler method. Exper ...

Elsevier2008

Influence of macro-roughness of walls on steady and unsteady flow in a channel

Tobias Meile

High-head storage hydropower plants mainly operate their turbines during periods of high energy demand. The sudden starting and stopping of turbines (hydropeaking) lead to highly unsteady flow in channels and rivers. Besides hydropeaking, other anthropogen ...

EPFL2007

High velocity aerated flow on stepped chutes with macro-roughness elements

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ACOUSTIC RESONNANCE IN CAVITATION FREE AND CAVITATING FLOWS

Transitional cylindrical swirling flow in presence of a flat free surface

Dissipation of boundary-induced flow disturbances in cylindrical soil columns

Study and Numerical Simulation of Sediment Transport in Free-Surface Flow

Aerated flows on stepped chutes with macro-roughness elements, Part II : Energy dissipation

Aerated flows on stepped chutes with macro-roughness elements - Part I: Hydraulic characteristics

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Improvement of Acoustic Doppler Velocimetry in steady and unsteady turbulent open-channel flows by means of seeding with hydrogen bubbles

Influence of macro-roughness of walls on steady and unsteady flow in a channel

Study and Numerical Simulation of Sediment Transport in Free-Surface Flow

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Influence of macro-roughness of walls on steady and unsteady flow in a channel

ACOUSTIC RESONNANCE IN CAVITATION FREE AND CAVITATING FLOWS

Aerated flows on stepped chutes with macro-roughness elements, Part II : Energy dissipation

Transitional cylindrical swirling flow in presence of a flat free surface

Aerated flows on stepped chutes with macro-roughness elements - Part I: Hydraulic characteristics

Improvement of Acoustic Doppler Velocimetry in steady and unsteady turbulent open-channel flows by means of seeding with hydrogen bubbles

Dissipation of boundary-induced flow disturbances in cylindrical soil columns