Issue |
Europhys. Lett.
Volume 75, Number 2, July 2006
|
|
---|---|---|
Page(s) | 335 - 341 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2006-10088-6 | |
Published online | 14 June 2006 |
Surface-roughness–driven segregation in a granular slurry under shear
Centre de recherche Paul-Pascal, CNRS - av. A. Schweitzer, 33600-Pessac, France
Received:
29
March
2006
Accepted:
22
May
2006
“Shear-induced segregation” (SIS) means that different species of
particles in a granular material or a concentrated suspension tend to unmix
under flow. In principle, any kind of difference (size, density, shape and
even surface state) may lead to SIS. We report the first direct experimental
evidence of SIS between spheres which only differ by surface
characteristics. The effect is observed with a “slurry” made of solid
spheres immersed in a viscous fluid, inside a parallel-plate shear device.
We show that: i) A mixture of smooth and rough spheres of same size shows
considerable SIS. ii) Rough spheres (radius aR) behave similarly to smooth but larger spheres (radius . iii)
Segregation cancels out for a particular value of the size ratio,
. These findings can be qualitatively
understood from available theories about the role of surface roughness on
two-sphere interactions in Stokes regime.
PACS: 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, 2006
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