In this work, frictional, cylindrical particle shear flows with different size distributions (monodisperse, binary, Gaussian, uniform) are simulated using the Discrete Element Method (DEM). The influences of particle size distribution and interparticle friction coefficient on the solid phase stresses, bulk friction coefficient, and jamming transition are investigated. In frictional dense flows, shear stresses rise rapidly with the increasing solid volume fraction when jamming occurs. The results suggest that at the jamming volume fraction, stress fluctuation and granular temperature achieve the maximum values, and the rate of the stress increase with increasing solid volume fraction approaches the peak value. Meanwhile, the degree of cylindrical particle alignment approaches a valley value. In the polydisperse flows, the jamming volume fraction exhibits significant dependences on the fraction of the longer particles and the particle size distribution. Two models considering the effect of particle size distribution are discussed for predicting the jamming volume fractions of polydisperse flows with frictional, cylindrical particles.

在这项工作中，使用离散元方法 (DEM) 模拟具有不同尺寸分布（单分散、二元、高斯、均匀）的摩擦圆柱形粒子剪切流。研究了粒度分布和颗粒间摩擦系数对固相应力、体摩擦系数和堵塞转变的影响。在摩擦密集的流动中，当发生堵塞时，剪切应力随着固体体积分数的增加而迅速增加。结果表明，在堵塞体积分数下，应力波动和颗粒温度达到最大值，并且应力随固体体积分数增加而增加的速率接近峰值。同时，圆柱形颗粒排列的程度接近谷值。在多分散流中，堵塞体积分数表现出对较长颗粒的分数和粒度分布的显着依赖性。讨论了考虑颗粒尺寸分布影响的两种模型，用于预测具有摩擦性圆柱形颗粒的多分散流的阻塞体积分数。