Two-way coupled simulations of the solids-liquid flow in a lab-scale mixing tank operating at a Reynolds number of 4000 and a solids volume fraction of 10% have been performed. The simulations keep track of individual particles, including their collisions. Upon a collision a particle is broken if the magnitude of the momentum exchanged in the collision exceeds a threshold value. The latter value is a measure for the strength of the particle. We observe how the flow systems, with ever decreasing particle sizes, evolve in time and quantify which collisions at what location primarily lead to breakage. The revolving impeller is the major source of breakage, either directly through particle-impeller collisions or by high-impact particle-particle collisions in the impeller-swept volume.

在实验室规模的混合罐中，在雷诺数为4000且固体体积分数为10％的情况下，进行了固液流动的双向耦合模拟。模拟会跟踪单个粒子，包括它们的碰撞。在碰撞中，如果在碰撞中交换的动量的大小超过阈值，则粒子会破裂。后一个值是颗粒强度的量度。我们观察到随着粒径不断减小的流动系统如何随时间演变，并量化在哪个位置发生的碰撞主要导致破裂。旋转的叶轮是破损的主要来源，直接通过颗粒-叶轮碰撞或通过在叶轮扫过的体积中发生高冲击力的颗粒-颗粒碰撞而造成。