Segregation transitions in wet granular matter

Details Segregation transitions in wet granular matter Segregation transitions in wet granular matter

2000-08-20

arxiv.org/abs/cond-mat/0008293v1

Phys. Rev. Lett. 85, 5102-5105 (2000)

Physics

Condensed Matter

5 pages, 4 figures, high resolution and more information: http://physics.clarku.edu/~akudrolli/nls.html

Scientific paper

10.1103/PhysRevLett.85.5102

We report the effect of interstitial fluid on the extent of segregation by imaging the pile that results after bidisperse color-coded particles are poured into a silo. Segregation is sharply reduced and preferential clumping of small particles is observed when a small volume fraction of fluid $V_f$ is added. We find that viscous forces in addition to capillary forces have an important effect on the extent of segregation $s$ and the angle of repose $\theta$. We show that the sharp initial change and the subsequent saturation in $s$ and $\theta$ occurs over similar $V_f$. We also find that a transition back to segregation can occur when the particles are completely immersed in a fluid at low viscosities.

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