MRI investigation of granular interface rheology using a new cylinder shear apparatus

Pascal Moucheront (1) , François Bertrand (1) , Georg Koval (2) , Laurent Tocquer (2) , Stéphane Rodts (1) , Jean-Noël Roux (2) , Alain Corfdir (3) , François Chevoir (2) , François Bertrand

1 Physique des milieux poreux
2 Rhéophysique
3 cermes - Géotechnique

The rheology of granular materials near an interface is investigated through proton magnetic resonance imaging. A new cylinder shear apparatus has been inserted in the MRI device, which allows the control of the radial confining pressure exerted by the outer wall on the grains and the measurement of the torque on the inner shearing cylinder. A multi-layer velocimetry sequence has been developed for the simultaneous measurement of velocity profiles in different sample zones, while the measurement of the solid fraction profile is based on static imaging of the sample. This study describes the influence of the roughness of the shearing interface and of the transverse confining walls on the granular interface rheology.

Mots clés: velocimetry; granular material; annular shear; interface; roughness

Domaines: Dynamique des Fluides [physics.flu-dyn]; Instrumentations et Détecteurs [physics.ins-det]

Pascal Moucheront, François Bertrand, Georg Koval, Laurent Tocquer, Stéphane Rodts, et al.. MRI investigation of granular interface rheology using a new cylinder shear apparatus. Magnetic Resonance Imaging, 2010, 28, pp.910-918. ⟨10.1016/j.mri.2010.01.007⟩. ⟨hal-00442722⟩