Shear flow of cohesive powders with contact crystallization: experiment, model and calibration
Shear flow of cohesive powders with contact crystallization: experiment, model and calibration
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DOI：
10.1007/s10035-015-0555-3
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发表时间：
2015-03
期刊：
影响因子：
2.4
通讯作者：
A. Weuster;S. Strege;L. Brendel;H. Zetzener;D. Wolf;A. Kwade
中科院分区：
文献类型：
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作者：
A. Weuster;S. Strege;L. Brendel;H. Zetzener;D. Wolf;A. Kwade
这项工作提出了一个实验和数值研究的剪切流动的粘性，结块粉末。以氯化钾（KCl）为模型材料，采用Schulze环形剪切试验机测定了原液的流动行为随储存时间的变化。我们的研究结果表明，氯化钾蛋糕上的特征时间尺度，这是独立的正常负荷。基于详细的产品特征，提出了一种广义弹塑性接触模型的离散元模拟相结合的方法，逐次校准。微观参数，这是不直接测量，被用作有效的，以适应一个理想的粒子系综的流动行为的实验结果。在这个过程中，我们研究这些微观参数对宏观量以及散装的结构的影响。成功的校准证实，复杂的散装材料，如氯化钾的流变学，可以有效地预测简化的数值模拟。
This work presents an experimental and numerical investigation of the shear flow of a cohesive, caking powder. Utilizing potassium chloride (KCl) as a model material, the bulk’s flow behavior with respect to storage time is measured with a Schulze ring shear tester. Our results suggest that KCl cakes on a characteristic timescale, which is independent of the normal load. Based on a detailed product characterization, a generalized elastoplastic contact model for discrete element simulations combined with an approach of successive calibration is proposed. Mircoscopic parameters, which are not measured directly, are used as effective ones to fit the flow behavior of an idealized ensemble of particles to the experimental findings. Within this process, we investigate the influence of these microscopic parameters on macroscopic quantities as well as the bulk’s structure. Successful calibration confirms that the rheology of complex bulk materials, such as KCl, can be predicted efficiently with simplified numerical simulations.