Effect of the Lifting Velocity and Container Shape on Angle of Repose of Iron Ore Particles
Effect of the Lifting Velocity and Container Shape on Angle of Repose of Iron Ore Particles
复制标题
提升速度和容器形状对铁矿石颗粒休止角的影响
DOI：
10.1155/2017/3405432
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发表时间：
2017
影响因子：
--
通讯作者：
Zixin Yin
中科院分区：
文献类型：
--
作者：
Tongqing Li;Yuxing Peng;Zhencai Zhu;Zhangfa Yu;Zixin Yin
为了研究提升速度和容器形状对休止角的影响，采用了三种容器形状的固定底圆柱法。容器的形状被提升了一系列的提升速度。试验采用了从粗到细的六种不同粒度的铁矿石颗粒。然后用沙堆校准法对铁矿石颗粒的接触参数进行了标定。结果表明，休止角随提升速度呈指数递减，而与颗粒形状近似不变。在低提升速度下，砂堆高度依赖于容器形状，但在高提升速度下，砂堆表现出与颗粒大小不变的特性。并建立了预测方程，预测休止角与实测值吻合较好。最后，利用球块方法对颗粒形状不规则的接触参数进行了一系列DEM模拟，结果与实验结果吻合较好，说明了接触参数的“调谐”以及预测方程的适用性。
To investigate the impact of lifting velocity and container shape on angle of repose, the fixed-base cylinder method was performed using three types of container shape. The container shape was lifted a series of lifting velocities. Six size fractions of iron ore particles ranging from coarser to fine particles were used as the test materials. And the sand-pile calibration method was then used to calibrate the contact parameters of iron ore particles. Results show angle of repose decreased exponentially with the lifting velocity, while it appeared approximately to be invariant to particle shape, for all size fractions. The sand pile highly depends on the container shape at a low lifting velocity but appears to be invariant to particle size for a high lifting velocity. And then a predictive equation is established and a very close agreement between the predicted and measured angle of repose is attained. Finally, a series of DEM simulations considering the irregular particle shape are conducted by means of sphere clump method to calibrate the contact parameters and are in good visual agreement with the experimental results, indicating the “tuned” contact parameters as well as the applicability of the predicted equation.
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影响因子：
5.2
作者：
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通讯作者：
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