当前位置: X-MOL 学术Physica A › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effects of the long-range cohesive forces in binary particle packing dynamics
Physica A: Statistical Mechanics and its Applications ( IF 3.3 ) Pub Date : 2020-10-17 , DOI: 10.1016/j.physa.2020.125456
Carlos Handrey Araujo Ferraz

Studies on random packing of bidispersive particles have shown that such systems can capture the underlying behavior of more complex phenomena found in physics and materials engineering. In industry, bidispersive particles are used to allow the increase of density and fluidity of the formed compounds. The understanding of the dynamics of these processes is therefore of great theoretical and practical interest. In this paper, we perform molecular dynamics (MD) simulations to study the packing process of particles with binary size distribution. Samples with different particle population densities (p) as well as different particle size ratios (λ) have been assessed. The initial positions of five thousand non-overlapping particles are assigned inside a confining rectangular box. After that, the system is allowed to settle under gravity towards the bottom of the box. Both the translational and rotational movements of each particle are considered in the simulations. In order to deal with interacting particles, we take into account both the contact and long-range cohesive forces. The normal viscoelastic force is calculated according to the nonlinear Hertz model, whereas the tangential force is calculated through an accurate nonlinear-spring model. Assuming a molecular approach, we account for the long-range cohesive forces using a Lennard-Jones(LJ)-like potential. The packing processes are studied assuming different long-range interaction strengths. We carry out statistical calculations of the different quantities studied including packing density, radial distribution function and orientation pair correlation function.



中文翻译:

远程内聚力对二元颗粒堆积动力学的影响

对双分散粒子无规堆积的研究表明,这种系统可以捕获物理和材料工程中发现的更复杂现象的潜在行为。在工业上,双分散颗粒用于增加所形成化合物的密度和流动性。因此,对这些过程动力学的理解具有重大的理论和实践意义。在本文中,我们执行分子动力学(MD)模拟以研究具有二元尺寸分布的颗粒的堆积过程。具有不同粒子种群密度的样品(p)以及不同的粒径比(λ)已被评估。五千个非重叠粒子的初始位置分配在一个封闭的矩形框中。之后,让系统在重力作用下朝盒子底部沉降。在模拟中考虑了每个粒子的平移和旋转运动。为了处理相互作用的粒子,我们同时考虑了接触力和远距离内聚力。根据非线性Hertz模型计算法向粘弹力,而通过精确的非线性弹簧模型计算切向力。假设采用分子方法,我们使用类似Lennard-Jones(LJ)的势能说明长距离内聚力。以不同的长程相互作用强度为前提,研究了包装过程。

更新日期:2020-10-29
down
wechat
bug