A discrete element method investigation within vertical stirred milling: Changing the grinding media restitution and sliding friction coefficients

A discrete element method investigation within vertical stirred milling: Changing the grinding media restitution and sliding friction coefficients
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立式搅拌研磨中的离散元方法研究:改变研磨介质恢复力和滑动摩擦系数

DOI:
10.1016/j.powtec.2022.117825
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发表时间:
2022
期刊:
影响因子:
5.2
通讯作者:
Rhymer D
Rhymer D
中科院分区:
工程技术2区
文献类型:
--
作者:
Rhymer D

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采用离散元法研究了立式搅拌磨内磨粒间恢复力和磨粒间滑动摩擦系数的变化对磨矿性能的影响。模拟含有3491个颗粒的190 mm直径的磨碎机以探索跨越五个旋转速度的参数值的组合。结果表明,在参数空间的变化,变得显着,如果滑动摩擦福尔斯下降到0.1以下,作为单体运动的形式从减少的阻力。除此之外,力对恢复力和摩擦力的变化都很敏感,特别是后者。更高的旋转速度也导致增加的效率。然而,这也是以增加功率消耗为代价的。结果表明,需要在效力和效率之间达成妥协,但也可以作为在更复杂的情况下作出简化假设的基础。可以在https://github.com/darhyme147/ligggghts_stirred_mill_template上找到模拟的模板版本。
The paper investigates the effects of changing the particle–particle restitution and sliding friction coefficients of grinding media within a vertical stirred mill using the discrete element method (DEM). A 190 mm diameter attritor mill containing 3491 particles was simulated to explore combinations of parameter values, across five rotational velocities. The results show variation over the parameter space, becoming significant if the sliding friction falls below 0.1, as single-body motion forms from the reduced resistance. Above this, forces are sensitive to changes in both restitution and friction, particularly the latter. Higher rotational velocities also lead to increased effectiveness. However, it also comes at a cost of increased power draw. The results suggest that a compromise would need to be made between effectiveness and efficiency, but could also form a basis for making simplifying assumptions in more complex scenarios. A template version of the simulation can be found at https://github.com/darhyme147/ligggghts_stirred_mill_template.
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