Granular Matter

, Volume 11, Issue 3, pp 185–191 | Cite as

Segregation and stability of a binary granular heap

  • A. G. Swartz
  • J. B. Kalmbach
  • J. Olson
  • R. J. Zieve
Open Access
Article

Abstract

We measure stability of two-dimensional granular mixtures in a rotating drum and relate grain configurations to stability. We use two types of grains which differ in both size and shape, with the larger grains reaching a larger average angle before an avalanche. In our mixtures, the smaller grains cluster near the center of the drum, while the larger grains remain near the outer edge, a pattern suggesting that grain size rather than avalanche angle determines the segregation behavior. One consequence of the size segregation is that the smaller grains heavily influence the stability of the heap. We find that the maximum angle of stability is a non-linear function of composition, changing particularly rapidly when small grains are first added to a homogeneous pile of large grains. We conclude that the grain configuration within the central portion of the heap plays a prominent role in stability.

Keywords

Rotating drum Static sandpile Avalanches Segregation Grain shape 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2009

Authors and Affiliations

  • A. G. Swartz
    • 1
  • J. B. Kalmbach
    • 1
  • J. Olson
    • 1
  • R. J. Zieve
    • 1
  1. 1.Physics DepartmentUniversity of CaliforniaDavisUSA

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