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Segregation and stability of a binary granular heap

机译:二进制粒度堆的隔离和稳定性

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摘要

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 play s a prominent role in stability.
机译:我们在转鼓中测量二维颗粒混合物的稳定性,并将颗粒构型与稳定性联系起来。我们使用两种类型的晶粒,它们的大小和形状都不同,较大的晶粒在雪崩之前达到较大的平均角度。在我们的混合物中,较小的晶粒聚集在鼓的中心附近,而较大的晶粒保留在外边缘附近,这种模式表明晶粒大小而不是雪崩角决定了偏析行为。尺寸偏析的结果之一是较小的颗粒会严重影响堆料的稳定性。我们发现,最大稳定角是成分的非线性函数,当首先将小颗粒添加到大颗粒的均匀堆中时,变化特别迅速。我们得出结论,堆中心部分的晶粒构型在稳定性中起着重要作用。

著录项

  • 来源
    《Granular matter》 |2009年第3期|185-191|共7页
  • 作者单位

    Physics Department, University of California, Davis, CA 95616, USA;

    Physics Department, University of California, Davis, CA 95616, USA;

    Physics Department, University of California, Davis, CA 95616, USA;

    Physics Department, University of California, Davis, CA 95616, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    rotating drum; static sandpile; avalanches; segregation; grain shape;

    机译:转鼓静态沙堆雪崩隔离颗粒形状;

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