Hopper discharge of elongated particles of varying aspect ratio: Experiments and DEM simulations
Hopper discharge of elongated particles of varying aspect ratio: Experiments and DEM simulations
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DOI：
10.1016/j.cesx.2019.100040
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发表时间：
2019-09
影响因子：
--
通讯作者：
Henna Tangri;Yu Guo;J. Curtis
中科院分区：
文献类型：
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作者：
Henna Tangri;Yu Guo;J. Curtis
通过料斗的颗粒或颗粒材料和散装固体的稳定流动在许多工业和过程工程应用中起着至关重要的作用。本工作研究了非球形颗粒，特别是圆柱形颗粒，从矩形漏斗的漏斗排出。通过实验和数值模拟研究了变径比（变径定长和变径定长）下钢柱颗粒的行为。此外，通过DEM模拟研究了充填高度、颗粒摩擦力、料斗孔口宽度和料斗锥角对非球形颗粒料斗排出率的影响，并与已有的实验关联、球形颗粒实验结果进行了对比。结果表明，DEM模拟完全能够再现实验建立的趋势。高纵横比颗粒的结果与先前观察到的圆形颗粒的趋势不同。随着填料高度的增加，质量流量先增大后趋于渐近线；充填高度的进一步增加导致质量排料率的降低。此外，颗粒摩擦对料斗出料行为有显著影响。另外，当料斗角从90度减小到临界角55度时，质量出料率流量减小，料斗角进一步减小，出料率迅速增加。
Steady flow of particulate or granular materials and bulk solids through a hopper plays a critical role in many industrial and process engineering applications. The present work investigates hopper discharge of non-spherical particles, specifically cylindrical particles, from a rectangular hopper. The behavior of steel cylindrical particles with varying aspect ratio (both varying diameter with constant length and varying length with constant diameter) was explored experimentally and via DEM simulations. In addition, the effects of fill height, particle friction, hopper orifice width and hopper cone angle on hopper discharge rate of non-spherical particles were studied via DEM simulations and compared with previously published experimental correlations, experimental results of spherical particles. The results indicate that DEM simulations are fully capable of reproducing trends that are established experimentally. The results with particles of high aspect ratio indicate a different trend than that previously observed with rounded particles. As the fill height increases, the mass discharge rate increases and then asymptotes; further increases in fill height cause a decrease in the mass discharge rate. Further, the effect of particle friction showed a significant influence on the hopper discharge behavior. In addition, a decrease in the hopper angle from 90 degree to critical angle 55 degree decreases the mass discharge rate flow and further decrease in hopper angle increases the discharge rate rapidly.