论文标题
软球的间歇性流量和瞬态拥塞通过狭窄的孔口
Intermittent flow and transient congestions of soft spheres passing narrow orifices
论文作者
论文摘要
筒仓中的柔软，低摩擦颗粒在放电期间显示出特殊的特征。流出速度和堵塞概率都取决于瞬时的筒仓填充高度，与充满硬颗粒的筒仓形成鲜明对比。原因是压力在孔口处的填充高度依赖性。我们研究软水凝胶球的筒仓排放的统计数据。发现流出变得越来越波动，甚至随着孔口尺寸的减小，并且填充高度的降低。在比两个粒子直径狭窄的孔中，流出可以完全停止，但是与刚性颗粒形成的堵塞相反，这些拥塞可能会自发溶解。我们分析了这种非永久交通拥堵，并将它们归因于材料粘弹性引起的容器中的重组过程减慢。
Soft, low-friction particles in silos show peculiar features during their discharge. The outflow velocity and the clogging probability both depend upon the momentary silo fill height, in sharp contrast to silos filled with hard particles. The reason is the fill-height dependence of the pressure at the orifice. We study the statistics of silo discharge of soft hydrogel spheres. The outflow is found to become increasingly fluctuating and even intermittent with decreasing orifice size, and with decreasing fill height. In orifices narrower than two particle diameters, outflow can stop completely, but in contrast to clogs formed by rigid particles, these congestions may dissolve spontaneously. We analyze such non-permanent congestions and attribute them to slow reorganization processes in the container, caused by viscoelasticity of the material.
