Publications by Sébastien Wiederseiner

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

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

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

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

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

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

Avalanches of concentrated granular suspensions down on inclined plane

Christophe Ancey, Nicolas Andreini, Martin Rentschler, Sébastien Wiederseiner

2008

Rheophysical Investigation in Concentrated Particle Suspensions

Christophe Ancey, Nicolas Andreini, Martin Rentschler, Sébastien Wiederseiner

The Society of Rheology2008

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

Christophe Ancey, Steve Cochard, Martin Rentschler, Sébastien Wiederseiner

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

Christophe Ancey, Steve Cochard, Martin Rentschler, Sébastien Wiederseiner

2006

Front dynamics of supercritical non-Boussinesq gravity currents

Christophe Ancey, Steve Cochard, Martin Rentschler, Sébastien Wiederseiner

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