摩擦对硬球系统的封装效率和短到中距离结构的影响
Jiajun Tang1, Xiaohui Wen1, Zhen Zhang1
1College of Mathematics and Physics, Chengdu University of Technology, Chengdu 610059, China.
The Journal of chemical physics
|November 15, 2023
概括
增加颗粒摩擦会在硬球混合物中产生更加无序的包装. 这种摩擦显著影响中程结构和秩序,特别是对于丰富的粒子.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 计算科学 计算科学
背景情况:
- 了解颗粒包装对于材料性能至关重要.
- 摩擦在颗粒混合物中的作用是复杂的,并未完全理解.
- 硬球模型为研究包装现象提供了一个基本框架.
研究的目的:
- 研究粒子间摩擦如何影响二元硬球混合物的包装结构.
- 分析摩擦对局部和中等范围结构秩序的影响.
- 为了确定粒子组成对摩擦引起的结构变化的影响.
主要方法:
- 采用了粒子解析的计算机模拟.
- 对硬球混合物进行了外部压缩.
- 分析涉及标准的两点相关函数 (半径分布函数,静态结构因子) 和四点相关法.
主要成果:
- 增加的摩擦会导致更混乱的局部包装和减少包装效率.
- 两点相关函数在短距离以外的距离上显示了最小的变化,与不同的摩擦.
- 一项四点相关性分析显示,在中间范围的摩擦依赖的二元体/二元体对称性.
- 较低的摩擦促进了方向顺序延伸到更远的距离.
- 混合物的组成,特别是较为丰富的物种的摩擦,显著影响了结构顺序和相关性长度.
结论:
- 粒子间摩擦是控制硬球混合物的结构组织的关键因素.
- 标准的相关函数不足以捕捉摩擦对中距离顺序的微妙影响.
- 一种四点相关法有效地揭示了摩擦诱导的对称性及其范围.
- 主导的粒子物种在调节摩擦对整体结构的影响方面发挥着关键作用.
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