论文标题
筒仓插座附近障碍物对软球排放的影响
The effect of obstacles near a silo outlet on the discharge of soft spheres
论文作者
论文摘要
筒仓排放中的柔软光滑颗粒显示出特殊的特征，包括例如非永久性堵塞和间歇性流动。本文介绍了一项针对准2D筒仓中柔软的低效率水力\ -gel球的研究。我们通过将障碍物放在筒仓的出口前，在出院期间实施更具竞争性的行为。高速光学成像用于捕获排放过程。使用Mask R-CNN算法通过机器学习软件来识别和跟踪视野中的所有粒子。在这项研究中，分析了粒子跟踪速度法（PTV），速度，出口时间，堆积分数和动力应力的场。在行人动力学中，将障碍物放置在狭窄的门前可以减轻出口附近的压力并实现更有效的出口，而效果与我们的软晶粒相反。将障碍物放在孔口上方总是导致流速降低，在某些情况下，甚至增加了堵塞概率。
Soft smooth particles in silo discharge show peculiar characteristics, including, for example, non-permanent clogging and intermittent flow. This paper describes a study of soft, low-frictional hydro\-gel spheres in a quasi-2D silo. We enforce a more competitive behavior of these spheres during their discharge by placing an obstacle in front of the outlet of the silo. High-speed optical imaging is used to capture the process of discharge. All particles in the field of view are identified and tracked by means of machine learning software using a MASK R-CNN algorithm. With particle tracking velocimetry (PTV), the fields of velocity, egress time, packing fraction, and kinetic stress are analysed in this study. While in pedestrian dynamics, the placement of an obstacle in front of a narrow gate may reduce the stress near the exit and enable a more efficient egress, the effect is opposite for our soft grains. Placing an obstacle above the orifice always led to a reduction of the flow rates, in some cases even to increased clogging probabilities.
