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Role of flying buttresses in the jamming of granular matter through multiple rectangular outlets

机译：飞壁在通过多个矩形出口堵塞颗粒物质中的作用

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摘要

We present a simulation study on the formation of particle arches supported by flying buttresses that arrest the flow of monodisperse spherical particles through two adjacent slots (rectangular outlets) in a three-dimensional (3D) anisometric flat-bottomed silo discharging under gravity. Most previous experimental and simulation studies on the jamming of a silo have focused on a single outlet, and have shown that the mean number of particles exiting the silo before it jams depends on the ratio of outlet size to particle diameter (R). In this paper, we look at the nature of jamming if there are two adjacent outlets and discover some new physical insights on how sand arches are mechanically supported and how they interact with each other. For a fixed slot width D_0 and particle diameter d, the distance separating the two openings D_w is varied. The distribution of N particles exiting the silo before both slots are jammed is obtained for each D_w. From these distributions, we show that as D_w becomes less than approximately 3d, the particle arches on adjacent outlets start affecting each other, and mutually stable arches become harder to form. We show that in cases, where for a small orifice ratio R = D_0/d a single outlet would have easily jammed, two adjacent outlets do not jam. We propose that this is due to the importance of stable particles resting on the base of the silo adjacent to the arches, which redistribute the load much like a flying buttress does in Gothic arches.
机译：我们目前对由飞行支撑支撑的颗粒拱的形成进行模拟研究，该支撑阻止了单分散球形颗粒在重力作用下在三维（3D）等距平底筒仓中通过两个相邻的缝隙（矩形出口）流动。先前有关筒仓堵塞的大多数实验和模拟研究都集中在单个出口上，并且表明在筒仓堵塞之前离开筒仓的平均颗粒数取决于出口尺寸与粒径（R）的比值。在本文中，我们研究了如果存在两个相邻的出口，就会造成堵塞的性质，并发现一些有关如何物理支撑沙拱以及它们如何相互作用的新的物理见解。对于固定的缝隙宽度D_0和粒径d，两个开口D_w之间的间隔距离是变化的。对于每个D_w，获得在两个狭缝堵塞之前离开筒仓的N个颗粒的分布。从这些分布可以看出，随着D_w小于约3d，相邻出口上的粒子拱开始相互影响，并且相互稳定的拱变得更难形成。我们表明，在较小的孔口比R = D_0 / d的情况下，单个出口很容易堵塞，而相邻的两个出口则不会堵塞。我们认为，这是由于稳定颗粒位于拱门附近的筒仓底部的重要性，它可以像哥特式拱门中的飞does一样重新分配载荷。

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  • 来源
    《Granular matter》 |2014年第1期|125-132|共8页
  • 作者

    Somnath Mondal; Mukul M. Sharma;

  • 作者单位

    Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX 78712, USA;

    Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX 78712, 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

    Arch; Bridge; Jamming; Clogging; Sieve;

    机译：拱;桥;干扰堵塞;筛;

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