Publications related to Two-phase air-water flows: Scale effects in physical modelling

Gravity-driven slug motion in capillary tubes

The velocity of a liquid slug falling in a capillary tube is lower than predicted for Poiseuille flow due to presence of menisci, whose shapes are determined by the complex interplay of capillary, viscous, and gravitational forces. Due to the presence of m ...

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

Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer.

Christophe Ancey, Sébastien Wiederseiner

An optical visualization apparatus has been designed to measure the particle-velocity and solid-concentration profiles of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer. The main objective is to investigate the frictional-v ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2009

Scaling and dynamics of washboard roads

Anne-Florence Raphaëlle Bitbol

Granular surfaces subjected to forces due to rolling wheels develop ripples above a critical speed. The resulting pattern, known as washboard or corrugated road, is common on dry unpaved roads. We investigated this phenomenon theoretically and experimental ...

American Physical Society (APS)2009

Scaling of capillary, gravity and viscous forces affecting flow morphology in unsaturated porous media

Dani Or

Interplay between capillary, gravity and viscous forces in unsaturated porous media gives rise to a range of complex flow phenomena affecting morphology, stability and dynamics of wetting and drainage fronts. Similar average phase contents may result in si ...

2008

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

Reduced basis method for the shape optimization of racing car components

Claudia Günther

In this work we apply reduced basis methods to parametrized airfoils configurations to study inviscid potential, thermal and viscous flows. Parametrization includes geometry, ground effect and airfoils interaction. ...

2008

Simulation of shear-driven flows

Roland Bouffanais

The research work reported in the present dissertation is aimed at the analysis of complex physical phenomena involving instabilities and nonlinearities occurring in fluids through state-of-the-art numerical modeling. Solutions of intricate fluid physics p ...

EPFL2007

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

Hydraulic contacts controlling water flow across porous grains

Dani Or, Marco Stampanoni

Water flow between porous grains varies widely depending on the water distribution in contacts between grains. The hydraulic behavior of contacts varies from highly conductive when water fills the contacts to a bottleneck to flow as water pressure drops an ...

2007

Two-phase air-water flows: Scale effects in physical modelling

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Gravity-driven slug motion in capillary tubes

Transitional cylindrical swirling flow in presence of a flat free surface

Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer.

Scaling and dynamics of washboard roads

Scaling of capillary, gravity and viscous forces affecting flow morphology in unsaturated porous media

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Reduced basis method for the shape optimization of racing car components

Simulation of shear-driven flows

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

Hydraulic contacts controlling water flow across porous grains

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

Simulation of shear-driven flows

Scaling of capillary, gravity and viscous forces affecting flow morphology in unsaturated porous media

Scaling and dynamics of washboard roads

Transitional cylindrical swirling flow in presence of a flat free surface

Gravity-driven slug motion in capillary tubes

Liquid–liquid two-phaseflow patterns andmasstransfer characteristics inrectangular glassmicroreactors

Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer.

Reduced basis method for the shape optimization of racing car components

Hydraulic contacts controlling water flow across porous grains