We employed the discrete element method to study the effects of the impeller configuration (i.e., blade diameter, inclination angle, and blade number), rotational speed, and fill level on the flow and mixing of particles in a cylindrical mixer equipped with flat and inclined blades. The coefficient of rolling friction, coefficient of static friction, and coefficient of restitution were experimentally determined before the simulation, and simulation results of the torque and surface particle distribution were validated in experiments, particularly when using a true Young’s modulus in the discrete element method. The performance of the mixer was assessed using the Lacey mixing index. The input work per unit volume was used to represent the mixing efficiency. The circumferential velocity and axial diffusion coefficient of the particles were quantitatively analyzed to reveal the effect of particle flow on the mixing. It was found that the mixing performance and efficiency of a three-blade mixer are better than those of two- and four-blade mixers. For pitched blades, a three-flat-blade mixer has better mixing performance than a three-45°-blade own-pumping or a three-45°-blade up-pumping mixer, but the mixing efficiency of the three-45°-blade up-pumping mixer is the best among these three mixers. As the rotational speed increases, the mixing performance improves but the mixing efficiency hardly changes. When the fill level is 0.4 times the cylinder diameter, the 160D two-flat-blade mixer has good mixing performance with high mixing efficiency. The circumferential velocity has the greatest effect on mixing performance for side-by-side initial loading.

我们采用离散元方法研究叶轮配置（即叶片直径，倾斜角度和叶片数量），转速和填充水平对装有平面和倾斜的圆柱形混合器中颗粒的流动和混合的影响刀片。在仿真之前，通过实验确定了滚动摩擦系数，静摩擦系数和恢复系数，并在实验中验证了扭矩和表面颗粒分布的仿真结果，特别是在离散元素方法中使用真实杨氏模量时。使用莱西混合指数评估混合器的性能。每单位体积的输入功用于表示混合效率。定量分析了颗粒的圆周速度和轴向扩散系数，以揭示颗粒流动对混合的影响。发现三叶片混合器的混合性能和效率优于两叶片和四叶片混合器。对于变桨叶片，三层平板搅拌机的混合性能要比三层45°叶片自吸式或三层45°叶片上吸式搅拌机更好，但三层45°搅拌机的混合效率更高。叶片上泵式搅拌机是这三种搅拌机​​中最好的。随着旋转速度的增加，混合性能提高，但是混合效率几乎不变。当填充量为缸径的0.4倍时，160D两叶式搅拌机具有良好的搅拌性能和较高的搅拌效率。