论文标题
排放2D筒仓期间的碰撞状态
Collisional regime during the discharge of a 2D silo
论文作者
论文摘要
本工作报告了使用分子动力学模拟的2D筒仓附近粒子附近粒子的碰撞动力学进行了新的研究。大多数关于这种颗粒系统的研究集中在大部分培养基上。在该区域中，接触是永久性或长寿的，因此连续近似能够产生速度分布或质量流量的结果。然而，接近出口，培养基的密度降低，接触是瞬时的。因此，动态的碰撞性质变得很重要，需要在这项工作中进行的专门研究。更有趣的是，出口附近是形成小孔流动的拱门的区域。发现从碰撞变量中，从堵塞状态（小孔）到连续流程的过渡是平滑的。此外，速度分布所反映的颗粒动力学也不受影响。该结果意味着，没有文献中提出的那样，没有关键的出口大小将两种政权分开。取而代之的是，获得的结果支持替代图片，其中任何出口尺寸都可以堵塞。
The present work reports a novel investigation into the collisional dynamics of particles in the vicinity of the outlet of a 2D silo using molecular dynamics simulations. Most studies on this granular system focus in the bulk of the medium. In this region contacts are permanent or long-lived, so continuous approximations are able to yield results for velocity distributions or mass flow. Close to the exit, however, the density of the medium decreases and contacts are instantaneous. Thus, the collisional nature of the dynamics becomes significant, warranting a dedicated investigation as carried out in this work. More interesting, the vicinity of the outlet is the region where the arches that block the flow for small apertures are formed. It is found that the transition from the clogging regime (at small apertures) to the continuous flow regime is smooth in collisional variables. Furthermore, the dynamics of particles as reflected by the distributions of the velocities is as well unaffected. This result implies that there is no critical outlet size that separates both regimes, as had been proposed in the literature. Instead, the results achieved support the alternative picture in which a clog is possible for any outlet size.
