Some considerations on the rheology of dense frictional cylindrical particles

Some considerations on the rheology of dense frictional cylindrical particles
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关于致密摩擦圆柱颗粒流变学的一些思考

DOI:
10.1016/j.partic.2022.02.005
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发表时间:
2022-02
期刊:
影响因子:
3.5
通讯作者:
Yu Guo
Yu Guo
中科院分区:
材料科学2区
文献类型:
--
作者:
Shiming Li;Jiahui Hao;Yanjie Li;Yu Guo

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对摩擦圆柱形颗粒的粒状剪切流进行了离散元方法模拟。通过模拟,可以测量固相压力、剪切应力和体积摩擦系数,从而可以研究颗粒特性对宏观流动行为的影响。因此,在之前的工作中经常用于球形颗粒的基于惯性数 I 的流变模型在本研究中检验了其对圆柱形颗粒的适用性。研究发现,颗粒长径比、颗粒间摩擦系数和颗粒尺寸多分散性均影响体积摩擦系数-惯性数相关性和固体体积分数-惯性数相关性,并且它们的影响在不同流态下有所不同,表现出不同的力学行为。
Discrete element method simulations of granular shear flows of frictional cylindrical particles are per-formed. From the simulations, solid-phase pressure, shear stress, and bulk friction coefficient can be measured, allowing the investigation of the effects of particle properties on the macroscopic flow behaviors. Thus, the inertial number I based rheological models, which were frequently used for the spherical particles in the previous work, are examined for the applicability to cylindrical particles in the present study. It is found that the particle aspect ratio, interparticle friction coefficient, and particle size polydispersity all affect the bulk friction coefficient-inertial number correlation and the solid volume fraction-inertial number correlation, and their effects vary in different flow regimes, which exhibit different mechanical behaviors.
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