Numerical investigation of collision dynamics of wet particles via force balance
Numerical investigation of collision dynamics of wet particles via force balance
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DOI：
10.1016/j.cherd.2018.02.026
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发表时间：
2018-04-01
影响因子：
3.9
通讯作者：
Heinrich, Stefan
中科院分区：
文献类型：
--
作者：
Buck, Britta;Lunewski, Johannes;Heinrich, Stefan
固体材料的碰撞动力学知识是理解和预测颗粒宏观过程，如流化床，混合器和造粒机的行为的基础。特别是，粒子与液体的碰撞仍然没有完全理解。许多实验研究解决由于碰撞和所涉及的液体引起的能量耗散。为此，通常使用所谓的恢复系数，其被定义为回弹与冲击速度的比率，同样描述动能的耗散。在这项工作中，提出了一个基于力平衡的数值模型，它预测了粒子和湿板的正常和倾斜碰撞的恢复系数。通过大量的实验验证了该模型的有效性，如碰撞速度和角度，液体性质以及初始粒子旋转的碰撞参数的影响。模型和实验之间的良好协议被发现为所有研究参数。(C)2018化学工程师学会。Elsevier B.V.出版，保留所有权利。
Knowledge of collision dynamics of solid materials is fundamental to understand and predict the behavior of particulate macro processes such as in fluidized beds, mixers and granulators. Especially, particle collisions with the presence of liquids are still not fully understood. Many experimental investigations address energy dissipation due to the collision and the liquid involved. For this the so-called coefficient of restitution is often used, which is defined as ratio of rebound to impact velocity, as such describing dissipation of kinetic energy. In this work a numerical model based on force balances is proposed, which predicts the coefficient of restitution for normal and oblique collisions of a particle and a wet plate. The model is validated by extensive experiments regarding the influence of collision parameters such as collision velocity and angle, liquid properties as well as initial particle rotation. Good agreement between model and experiments is found for all investigated parameters. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.