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阻尼对水平滚筒内二元颗粒体系径向分离模式形成的影响
Effect of damping on segregation of size-type binary granular systems in a rotating horizontal drum
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摘要: 采用离散单元数学模型对一充装量为50％的水平薄滚筒内s形二元颗粒体系的分离模式进行了数值模拟试验，研究了不同碰撞阻尼参数下的分离过程，分析了阻尼对分离过程及分离模式的影响．模拟结果表明阻尼对滚筒内颗粒的分离过程及分离模式影响很大，在S形二元颗粒体系水平薄滚筒内，阻尼可控制渗透和离析的协同作用以及自由表面层的流动形式，最终影响分离模式的形成；当阻尼太大时分离模式只能形成月亮模式，阻尼太小时可形成不明显的花瓣模式，只有当阻尼在适当的范围内，自由表面流动层形成雪崩流型式时，分离模式才会呈现规则的花瓣模式，试验结果从另一个角度证实了水平薄滚筒内S形二元颗粒体系不同分离模式形成的充分必要条件．Abstract: In this paper, the segregation patterns of size-type binary granular systems with different damp coefficients in a rotating horizontal drum are simulated by the discrete element model. The process and the mechanism of segregation are studied, and the effects of damping on segregation model of size-type binary granular system in a rotating horizontal drum are discussed. The simulation results show that the segregation process and the flow pattern of granulae in a flowing layer depend strongly on damping. According to the simulation results we predict that the radial segregation patterns that form in a size-type binary granula system in a thin rotating horizontal drum will be the sun pattern when the damp coefficients is in a middle value range, otherwise, the moon pattern will appear.
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