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同时考虑颗粒体积差异和密度差异,采用三维离散单元法模拟填充率为50%时水平转筒内二元颗粒床的径向混合与分离过程。结合渗流与凝聚竞争机理,对密度差和体积差导致的颗粒床分离现象进行分析。结果表明:颗粒体积差引起的渗流机理或密度差引起的凝聚机理均会作用于颗粒床的活动层,导致颗粒分离;调整颗粒体积比和密度比可使渗流和凝聚机理相互平衡,实现物料在转筒内的均匀混合;当渗流与凝聚平衡时,颗粒的体积比与密度比基本呈幂函数关系;当颗粒体积比和密度比确定后,二元颗粒床的混合度不受转筒尺寸的影响。
At the same time, considering the difference of volume and density, the three-dimensional discrete element method was used to simulate the radial mixing and separation of binary granular bed in horizontal drum with the filling rate of 50%. Combined with the competition mechanism of seepage and condensation, the particle bed separation phenomenon caused by density difference and volume difference is analyzed. The results show that the cohesive mechanism caused by the seepage mechanism or the density difference caused by the difference of the particle volume will act on the active bed of the granular bed, resulting in the separation of the particles. Adjusting the ratio of the particle volume and the density can balance the seepage and the aggregation mechanism, When the seepage flow and the cohesion balance, the volume ratio of the particles and the density ratio is a power function; when the particle volume ratio and the density ratio is determined, the degree of mixing of the binary particle bed from the drum size influences.