Publications de Sébastien Wiederseiner

Refractive-index and density matching in concentrated particle suspensions: a review

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Gaël Epely Chauvin

Optical measurement techniques such as particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) are now routinely used in experimental fluid mechanics to investigate pure fluids or dilute suspensions. For highly concentrated particle suspension ...

Springer-Verlag2011

Experimental investigation into segregating granular flows down chutes

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Gaudenz Moser, Gaël Epely Chauvin

We experimentally investigated how a binary granular mixture made up of spherical glass beads size ratio of 2 behaved when flowing down a chute. Initially, the mixture was normally graded, with all the small particles on top of the coarse grains. Segregati ...

2011

Rheophysics of concentrated particle suspensions in a Couette cell using a refractive index matching technique

Sébastien Wiederseiner

The main objective of this work is to gain insight into the rheometry and rheology of concentrated non-colloidal particle suspensions. Among the many questions that have as yet received little answers, we are especially interested in the rheometric problem ...

EPFL2010

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

Sébastien Wiederseiner, Christophe Ancey

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

Avalanches of concentrated granular suspensions down on inclined plane

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Martin Rentschler

2008

Rheophysical Investigation in Concentrated Particle Suspensions

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Martin Rentschler

The Society of Rheology2008

Existence and features of similarity solutions for non-Boussinesq gravity currents

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

In this paper, the flow dynamics of gravity currents on a horizontal plane is investigated from a theoretical point of view by seeking similarity solutions. The current is generated by unleashing a varying volume of heavy fluid within an ambient fluid of m ...

2007

Front dynamics of a water surge at high Reynolds number: Similarity solutions to the Saint-Venant equations

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

2006

Front dynamics of supercritical non-Boussinesq gravity currents

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

In this paper, we seek similarity solutions to the shallow water (Saint-Venant) equations for describing the motion of a non-Boussinesq, gravity-driven current in an inertial regime. The current is supplied in fluid by a source placed at the inlet of a hor ...

American Geophysical Union2006