The effects of processing intensity, time, and particle surface energy on mixing of binary cohesive powder blends in high-intensity vibration system were investigated via discrete element method simulations. The mixedness was quantified by the coefficient of variation, C_v; lower being better. The mixing rate, which is the speed at which homogeneity was achieved, was inversely proportional to the mixing Bond number, defined as the ratio of particle cohesion to the shear force resulting from the mixing intensity. Results show that both increasing processing intensity and reducing surface energy led to a faster mixing rate. However, the mixedness improved initially as mixing action (the product of mixing rate and mixing time) increased, but later deteriorated upon its further increase. Thus, both mixing rate and mixing intensity need to be tuned for optimum mixing performance depending on the cohesion level of particles; too high or too low mixing action should be avoided.

中文翻译：

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高强度振动系统中粘性粒子二元混合混合的离散元法模拟

通过离散元法模拟研究了加工强度、时间和颗粒表面能对高强度振动系统中二元粘性粉末混合物混合的影响。混合度由变异系数C _v量化; 越低越好。混合速率，即达到均匀性的速度，与混合键数成反比，键数定义为颗粒内聚力与混合强度产生的剪切力之比。结果表明，增加加工强度和降低表面能都会导致更快的混合速度。然而，随着混合作用（混合速度和混合时间的乘积）的增加，混合度最初会有所改善，但随着进一步增加，混合度会恶化。因此，混合速率和混合强度都需要根据颗粒的内聚水平调整以获得最佳混合性能；应避免过高或过低的混合动作。