Europhys. Lett.
Volume 66, Number 1, April 2004
Page(s) 139 - 145
Section Interdisciplinary physics and related areas of science and technology
Published online 01 March 2004
Europhys. Lett., 66 (1) , pp. 139-145 (2004)
DOI: 10.1209/epl/i2003-10191-2

Flow and segregation in sheared granular slurries

C. Barentin1, 2, E. Azanza1, 3 and B. Pouligny1

1  CRPP - Avenue A. Schweitzer, 33600 Pessac, France
2  LPMCN, Université Claude Bernard Lyon I - 69622 Villeurbanne, France
3  CNAV - 15 avenue L. Jouhanneau, BP 7266, 37072 Tours, France

(Received 24 July 2003; accepted in final form 8 January 2004)

We study the behaviour of a granular slurry, i.e., a very concentrated suspension of heavy (denser than the fluid) and polydisperse particles sheared between two parallel-plane circular disks. For small gaps, the slurry behaves as a 2d system with a characteristic radial size segregation of particles. For large gaps, the slurry responds as a 3d system, with considerable vertical segregation and a concomitant 2-phase (fluid, solid) flow structure. The thickness $\zeta$ of the fluid phase is the 2d-3d gap crossover. Surprisingly, $\zeta$ is found to be nearly unaffected by very large changes in the particle size distribution.

83.80.Hj - Suspensions, dispersions, pastes, slurries, colloids.
64.75.+g - Solubility, segregation, and mixing; phase separation.
83.85.Ei - Optical methods; rheo-optics.

© EDP Sciences 2004