Effects of Material Properties on Granular Flow in a Silo Using DEM Simulation
Effects of Material Properties on Granular Flow in a Silo Using DEM Simulation
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DOI：
10.1080/02726350215338
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发表时间：
2002-04
影响因子：
2.5
通讯作者：
Yong Xu;K. D. Kafui;C. Thornton;G. Lian
中科院分区：
文献类型：
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作者：
Yong Xu;K. D. Kafui;C. Thornton;G. Lian
为了研究物料性质对颗粒物料流动性的影响，在平底模型筒仓中，对球形颗粒的卸料过程进行了试验研究。采用离散元法对软、硬、无粘结和粘结硬三种情况进行了模拟。对于每个系统，在中心线上选择三个粒子，并追踪它们的瞬时垂直速度分量。此外，在整个手术过程中记录出院和心率。预测结果表明，对于两种无粘附的系统，尽管软材料的材料模量仅为硬材料的1/1000，但在流动模式和放电速率方面没有显著差异。这表明，在重力驱动的颗粒流中，可以使用软系统来预测硬系统的行为，以节省CPU时间。另一方面，两种硬系统之间的比较表明，粘附可以显着降低颗粒流的流动性。通过分析示踪颗粒的速度图，在减压区上方清楚地检测到自由落体，这表明颗粒流中颗粒的运动可以被分解为自由落体以及由于颗粒碰撞引起的运动。此外，选择动态行为有关的动力学波动影响流量进行了观察。离散元法筒仓颗粒流颗粒物料
In order to test the effect of material properties on flowability of particulate materials, discharge procedures of spherical particles within a flat-bottomed model silo with three sets of material properties, i.e., soft and hard without adhesion and adhesive hard, were simulated using the Discrete Element Method. For each system, three particles on the center line were selected and their instant vertical velocity components were traced. In addition, both discharge and the rate were recorded throughout the procedure. The predicted results show that, for both the systems without adhesion, though the soft has a material modulus only 1/1000 of the hard, there are no significant differences in f low pattern and discharge rate. This suggests that a soft system can be used to predict the behavior of a hard one to save CPU time in a gravity-driven granular flow. On the other hand, comparison between both hard systems shows that adhesion can significantly reduce the flowability in granular flow. By analyzing the velocity plot for the traced particles, free fall was clearly detected above the decompression zone, indicating the motion of a particle in a granular flow can be resolved as free fall together with the movement due to particle collision. In addition, select dynamic behavior related to the kinetic fluctuations affecting flow was observed. discrete element method silo granule flow particulate material