垂直振动下二元混合颗粒分离的影响因素及能量分析

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摘要颗粒物质在垂直振动下的分聚行为广泛存在于生产和生活领域，揭示内在分离机理对颗粒筛分、输运等领域有重要意义。采用离散单元法对垂直振动下二元混合颗粒的分离过程进行模拟研究，揭示接触刚度、摩擦系数和振动空间对分离效果的影响规律，并基于能量变化对分离效果进行分析。研究表明，接触刚度增大，颗粒平均动能有增大趋势，lacey分离指数增加，分离效果有所降低。摩擦系数增大，颗粒的动能出现先减小后增大的变化，lacey分离指数增加，分离效果降低。当摩擦系数增到某一定值，颗粒呈现近似周期运动，无法实现分离。振动空间和颗粒体积比小于1.2时，分离效果明显降低。大颗粒平均动能与小颗粒平均的比值影响颗粒的分离行为，并且存在分离效果较好的比值范围。大颗粒与小颗粒的平均动能越接近，二者分离越困难。
关键词：垂直振动；颗粒分离；摩擦系数；颗粒动能

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	刘瑜1
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	周甲伟1
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	罗晨旭1

关键词 ：垂直振动, 颗粒分离, 摩擦系数, 颗粒动能

Abstract：Segregation of particle matter under vertical vibration is a widely existence in the fields of production and life. It is signigicant for particle sieving and transportation to reveal the segregation mechanism. Discrete element method was employed to simulate the segregation procedure of binary mixed particle under vertical vibration. The influence rules of contact stiffness, friction coefficient and vibration space on segregation effect were carried out, and the energy variations were analyzed . The results show that with the increase of contact stiffness, the particle average kinetic energy and Lacey mixing index have a growing tendency, and the segregation effect is decreased. The particle average kinetic energy gets a nonlinear variation with the increase of friction coefficient. It decreases firstly and then increases. And the segregation effect is reduced steadily. When friction coefficient rises up to a certain value, particles appear a similar periodic motion and cannot be segregated. The segregation effect is obviously decreased when the ratio of vibration space to particle volume is less than 1.2. Additionally, the average kinetic energy ratios of big balls to small balls influence the segregation effect and there is a suitable range for a better segregation. If the average kinetic energy ratio of big balls is closed to that of small balls, the segregation will become more difficult.
Key words: vertical vibration; particle segregation; friction coefficient; particle kinetic energy

Key words： vertical vibration particle segregation friction coefficient particle kinetic energy

收稿日期: 2021-04-19 出版日期: 2022-09-28

引用本文:

刘瑜1，2，周甲伟1,3，荆双喜1，罗晨旭1. 垂直振动下二元混合颗粒分离的影响因素及能量分析[J]. 振动与冲击, 2022, 41(18): 298-310.
LIU Yu1,2, ZHOU Jiawei1,3, JING Shuangxi1, LUO Chenxu1. Influential factors and energy analysis on the segregation of binary mixture particles under vertical vibration. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(18): 298-310.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I18/298

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