Mixing and condensation in a wet granular medium

Physics – Condensed Matter – Statistical Mechanics

Scientific paper

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submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.168702

We have studied the effect of small amounts of added liquid on the dynamic behavior of a granular system consisting of a mixture of glass beads of two different sizes. Segregation of the large beads to the top of the sample is found to depend in a nontrivial way on the liquid content. A transition to viscoplastic behavior occurs at a critical liquid content, which depends upon the bead size. We show that this transition can be interpreted as a condensation due to the hysteretic liquid bridge forces connecting the beads, and provide the corresponding phase diagram.

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