BLANC , Frédéric

The subject of this thesis is an experimental study of the shear-induced microstructure in non-Brownian suspensions and its relation to the material rheological response, with a particular interest in the role played by the contact between particles. To this purpose, two experimental set-ups were developed. The first one, based on a Particle...

National audience

Les exp eriences qui sont pr esent ees ici concernent la s edimentation d'une sph ere dense de diam etre millim etrique dans une suspension isodense de particules plus petites dispers ees dans un uide new- tonien, le tout etant plac e dans une cellule de Couette d'axe vertical mont ee sur un rh eom etre. La vitesse de s edimentation...

This paper reports experiments on the shear transient response of concentrated non-Brownian suspensions. The shear viscosity of the suspensions is measured using a wide-gap Couette rheometer equipped with a Particle Image Velocimetry (PIV) device that allows measuring the velocity field. The suspensions made of PMMA particles (31µm in diameter)...

International audience

International audience

Les exp eriences qui sont pr esent ees ici concernent la s edimentation d'une sph ere dense de diam etre millim etrique dans une suspension isodense de particules plus petites dispers ees dans un uide new- tonien, le tout etant plac e dans une cellule de Couette d'axe vertical mont ee sur un rh eom etre. La vitesse de s edimentation...

National audience

Poster : Rhéologie locale des suspensions concentrées GFR 44 Strasbourg

International audience

We perform local measurements of both the velocity and the particle volume fraction to study viscous resuspension in non-Brownian suspensions for Shields numbers ranging from to . With this aim, a suspension of polymethacrylate spherical particles dispersed in a lighter Newtonian fluid (Triton X100) is sheared in a vertical Couette cell where...

The shear-induced microstructure in a semi-dilute non-colloidal suspension is studied. A high resolution Pair Distribution Function in the plane of shear is experimentally determined. It is shown to be anisotropic, with a depleted direction close to the velocity axis in the recession quadrant. The influence of roughness on the interaction...

We perform local measurements of both the velocity and the particle volume fraction to study viscous resuspension in non-Brownian suspensions for Shields numbers ranging from to . With this aim, a suspension of polymethacrylate spherical particles dispersed in a lighter Newtonian fluid (Triton X100) is sheared in a vertical Couette cell where...

National audience

International audience

National audience

The fall velocity of a dense large ball in a suspension of neutrally buoyant non-Brownian particles subjected to horizontal oscillatory shear is studied. As the strain amplitude is increased, the velocity increases up to a maximum value before decreasing to the value that it would have in a resting suspension. The higher the frequency is, the...

This paper presents an experimental facility that allows simultaneous viscosimetric and Particle Image velocimetry measurements on concentrated suspensions in a wide-gap Couette rheometer. The experimental procedure is detailed: the optical characteristics of the index-matched suspension are carefully studied, the bottom end effect on both the...

Poster Workshop on flocculated suspensions - Champs sur Marne, 28-29 June 2012

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