Segregation transitions in wet granular matter

Abstract

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.

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

References in corpus (4)

• Spontaneous Stratification in Granular Mixtures
• How Sandcastles Fall
• Size Segregation of Granular Matter in Silo Discharges
• Liquid induced transitions in granular media

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• Rheology and microstructure of unsaturated granular materials: Experiments and simulations
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• Lubrication effects on the flow of wet granular materials
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• Novel Experimentally Observed Phenomena in Soft Matter
• Formation of a hard surface layer during drying of a heated porous media
• Unsteady flows and inhomogeneous packing in damp granular heap flows
• Charging changes contact composition in binary sphere packings
• Dynamics Phases, Stratification, Laning, and Pattern Formation for Driven Bidisperse Disk Systems in the Presence of Quenched Disorder