In order to achieve flocculation in a dense agitated solid‐liquid suspension of nonaggregating particles, we explore scenarios where we add a limited amount of aggregative (ie, active) particles that can bind the nonaggregative particles. The performance of this process hinges on the competition between mixing (spreading the active particles over the flow volume) and aggregation among the active particles, with the latter reducing their effectiveness. The research has been conducted in a computational manner: direct simulations of transitional flow in a mixing tank (at an impeller‐based Reynolds number of 4000) are two‐way coupled with the dynamics of a collection of spherical, equally sized particles that are given specific aggregative properties. The overall solids volume fraction is 10%. A small fraction of all solid particles (5.8%) is active. Aggregation is quantified by means of the average coordination number as well as the aggregate size distribution. The way the active particles are released in the tank volume has a significant effect on the overall levels of aggregation, specifically for active particles with a strong aggregative force.

中文翻译：

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在混合罐中添加用于整体聚集的活性颗粒：计算研究

为了在非聚集颗粒的稠密搅拌固液悬浮液中实现絮凝，我们探索了添加有限量的可结合非聚集颗粒的聚集（即活性）颗粒的方案。该方法的性能取决于混合（在流动体积上扩散活性颗粒）和活性颗粒之间的聚集之间的竞争，而后者降低了它们的有效性。这项研究是以计算方式进行的：直接模拟混合槽（基于叶轮的雷诺数为4000）中的过渡流，并结合了给定的球形，大小相等的颗粒的动力学。具体的聚集特性。总固体体积分数为10％。所有固体颗粒中只有一小部分（5.8％）具有活性。聚集通过平均配位数和聚集大小分布进行量化。活性颗粒在储罐容积中的释放方式对总体聚集水平有显着影响，特别是对于具有强聚集力的活性颗粒而言。