Flow and segregation in sheared granular slurriesC. 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 of the fluid phase is the 2d-3d gap crossover. Surprisingly, 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