| 两种不同尺度的颗粒在水平振动容器内分离规律的模拟 |
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| 引用本文： | 周迪文,陈十一,蔡庆东. 两种不同尺度的颗粒在水平振动容器内分离规律的模拟[J]. 计算物理, 2006, 23(5): 559-563 |
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| 作者姓名： | 周迪文 陈十一 蔡庆东 |
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| 作者单位： | 北京大学力学与工程科学系,湍流与复杂系统国家重点实验室,北京,100871;北京大学力学与工程科学系,湍流与复杂系统国家重点实验室,北京,100871;北京大学力学与工程科学系,湍流与复杂系统国家重点实验室,北京,100871 |
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| 摘 要： | 用分子动力学方法模拟二维颗粒系统在水平振动下的分离现象.通过数值模拟发现,在固定的振幅下,存在使得分离效率最佳的振动频率,在固定的振动频率下,也存在一个使得分离效率最佳的振幅.根据模拟结果,给出了最佳振幅对振动频率的经验公式.同时,还指出了存在两种不同的分离机制,当振动的加速度过大时,处于垂直边界附近的大粒子会通过容器的边界直接被抛到最顶部.
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| 关 键 词： | 颗粒流动 尺度分离 分子动力学模拟 |
| 文章编号： | 1001-246X（2006）05-0559-05 |
| 收稿时间： | 2005-05-17 |
| 修稿时间： | 2005-09-12 |
Simulation of Size Segregation of Granulars with Two Sizes in a Horizontal Vibrating Container |
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| ZHOU Di-wen,CHEN Shi-yi,CAI Qing-dong. Simulation of Size Segregation of Granulars with Two Sizes in a Horizontal Vibrating Container[J]. Chinese Journal of Computational Physics, 2006, 23(5): 559-563 |
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| Authors: | ZHOU Di-wen CHEN Shi-yi CAI Qing-dong |
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| Affiliation: | LTCS, Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China |
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| Abstract: | The size segregation of grains is studied with two-dimensional molecular dynamic simulations for dissipative particles under horizontal vibration. A series of segregation that induced by horizontal vibrations at different amplitudes and frequencies are reported and the relationship between these two aspects is analyzed. A standard is given to scale the speed of the segregation. It is found that an optimal amplitude exists at a given frequency. An empiristic formula is obtained for this amplitude. It shows that another segregation mechanism exists at a large amplitude and frequency, in which the big particles are thrown directly to the top by the side wall. |
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| Keywords: | granular flow size segregation molecular dynamic simulation |
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