Possible Stratification Mechanism in Granular Mixtures

Details Possible Stratification Mechanism in Granular Mixtures Possible Stratification Mechanism in Granular Mixtures

1998-09-30

arxiv.org/abs/cond-mat/9809420v1

Phys. Rev. Lett. 78, 3298-3301 (1997)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, http://polymer.bu.edu/~hmakse/Home.html

Scientific paper

10.1103/PhysRevLett.78.3298

We propose a mechanism to explain what occurs when a mixture of grains of different sizes and different shapes (i.e. different repose angles) is poured into a quasi-two-dimensional cell. Specifically, we develop a model that displays spontaneous stratification of the large and small grains in alternating layers. We find that the key requirement for stratification is a difference in the repose angles of the two pure species, a prediction confirmed by experimental findings. We also identify a kink mechanism that appears to describe essential aspects of the dynamics of stratification.

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