Effect of Shear Rate Distribution on Particle Aggregation in a Stirred Vessel
Effect of Shear Rate Distribution on Particle Aggregation in a Stirred Vessel
复制标题
剪切速率分布对搅拌容器中颗粒聚集的影响
DOI：
10.1002/ceat.201600332
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发表时间：
2017
影响因子：
2.1
通讯作者：
N. Ohmura
中科院分区：
文献类型：
--
作者：
Hayato Masuda;K. Tsuda;K. Matsui;Y. Komoda;N. Ohmura
描述了简单剪切流下颗粒聚集的模型，并将该模型推广到搅拌容器中。该模型定量地展示了不同剪切速率下骨料数量随时间的变化。随着剪切速率的增大，该数值增大，反之，随着剪切速率的增大，骨料粒径变小。这是因为聚集体被更强的剪切力破坏。确定了不同叶轮的集料数量。剪切速率由实验得到的骨料粒度和模型方程反算得到。这种剪切速率与Metzner - Otto方法估计的剪切速率不同，因此，为了将Metzner - Otto方程应用于粒子聚集，可能需要对其进行一些修正。
The modeling of particle aggregation under a simple shear flow and the extension of the model to a stirred vessel is described. The model quantitatively demonstrates the change of the number of aggregates with time for each shear rate. This number increased with higher shear rate and, conversely, the aggregate size became small when raising the shear rate. This was because aggregates were broken by the stronger shear force. The number of aggregates for different impellers was determined. The shear rate was back‐calculated from the experimentally obtained aggregate size and the model equation. This shear rate was different from that estimated from the Metzner‐Otto method, consequently, some revisions of the Metzner‐Otto equation might be necessary for its application to particle aggregation.