水平振动情况下颗粒系统振动分离机理的离散元数值研究

发布时间：2018-04-11 03:30

本文选题：颗粒分离 + 离散元　；参考：《振动与冲击》2016年16期

【摘要】：采用三维离散元方法,生成不同大小颗粒粒径比与上覆颗粒厚度的颗粒集合体,模拟颗粒振动分离实验。通过离散元数值模拟研究颗粒数目对大颗粒振动分离的影响,揭示水平振动条件下孔隙的产生机制,分析了颗粒振动分离行为的细观机理。研究结果表明:振动分离过程中系统动能沿颗粒集合体高度方向分布不均匀,振动过程中系统下部颗粒所具有的动能更大,系统下部颗粒通过不断碰撞传递能量使得大颗粒底部产生孔隙,小颗粒随后快速填充大颗粒底部孔隙从而将大颗粒位置垫高;在相同粒径比之下,随着颗粒数目的增加,颗粒间碰撞作用和孔隙填充作用更加剧烈,大颗粒完成振动分离所需时间越来越短,但持续增加颗粒数目并不会缩短完成振动分离所需时间。
[Abstract]:Three-dimensional discrete element method was used to generate particle aggregates with different particle size ratio and overlying particle thickness, and simulated particle vibration separation experiment.The effect of particle number on the vibration separation of large particles is studied by discrete element numerical simulation. The mechanism of pore formation under horizontal vibration is revealed and the meso-mechanism of particle vibration separation behavior is analyzed.The results show that the kinetic energy of the system distributes unevenly along the height of the particle assembly during the vibration separation process, and the kinetic energy of the lower part of the system is even larger during the vibration process.The lower particles of the system transfer energy through continuous collision, and the small particles quickly fill the pores in the bottom of the large particles, so that the large particles are placed high; at the same particle size ratio, with the increase of the number of particles,The effect of particle collision and pore filling is more intense, and the time required for large particles to complete vibration separation is shorter and shorter, but the continuous increase in the number of particles will not shorten the time required to complete vibration separation.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金(51179139);国家自然科学基金优秀青年科学基金(51322905);国家自然科学基金(51509190) 中央高校基本科研业务费专项资金中国博士后科学基金面上资助(2015M572195)
【分类号】：O32

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