Rheology in dense assemblies of spherocylinders: Frictional vs. frictionless
Rheology in dense assemblies of spherocylinders: Frictional vs. frictionless
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DOI：
10.1140/epje/i2019-11925-5
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发表时间：
2018-12
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影响因子：
--
通讯作者：
Trisha Nath;C. Heussinger
中科院分区：
文献类型：
--
作者：
Trisha Nath;C. Heussinger
摘要利用分子动力学模拟方法，研究了不同长径比的各向异性球形圆柱体颗粒的稠密集合体的稳态剪切流动。比较无摩擦和有摩擦的颗粒，我们讨论了颗粒间摩擦力对体系流变特性的具体作用。在摩擦系统中，我们证明了剪切增稠机制，类似于球形颗粒的情况。此外，摩擦抑制了球柱沿着流动方向的对齐。最后，摩擦系统中的堵塞密度对纵横比的变化相当不敏感，这与无摩擦系统的已知情况完全相反。图形摘要
AbstractUsing molecular dynamics simulations, we study the steady shear flow of dense assemblies of anisotropic spherocylindrical particles of varying aspect ratios. Comparing frictionless and frictional particles we discuss the specific role of frictional inter-particle forces for the rheological properties of the system. In the frictional system we evidence a shear-thickening regime, similar to that for spherical particles. Furthermore, friction suppresses the alignment of the spherocylinders along the flow direction. Finally, the jamming density in frictional systems is rather insensitive to variations in aspect ratio, quite contrary to what is known from frictionless systems.Graphical abstract