摘要:
采用软球干接触模型对球形及非球形颗粒的分层过程进行了三维离散元法模拟研究,从颗粒间作用力、转动力矩和能量变化的角度分析了颗粒分层机理,讨论了颗粒的粒度比对分层速度的影响规律.结果表明,分层过程中,大颗粒比小颗粒活跃,非球颗粒由于具有较高的动能而比球颗粒活跃,在一定程度上弥补了颗粒形状对分层过程的影响.大颗粒间的平均法向、切向作用力、平均力矩及平均动能均大于小颗粒.颗粒分层速度随着粒度比的增加而显著增大,当粒度比大于临界粒度比3时,分层速度的增幅减缓.
关键词:
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离散元法
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非球颗粒
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分层
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数值模拟
Abstract:
Basing on dry contact model of soft spheres the segregation processes of spherical and non-spherical particles were simulated using threes-dimensional discrete element methods(DEM).Particle segregation mechanism was analyzed in view of force,torque and energy conversion between particles.Influence of segregation speed affected by particle size ratio was also discussed.The result shows that large particles are more active than small ones in segregation process,and non-spherical particles have higher energy,which makes up the influence of particle shape to segregation process to some extent,are more active than spherical particles.Average normal force,tangential force between large particles,their torque and kinetic energy are all greater than those of small particles.Particle segregation speed increases significantly with the increasing of size ratio. When the size ratio is greater than the critical value 3,the amplitude of increase in segregation speed will be slowed down.
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