Kosinski Pawel, Hoffmann Alex C
The University of Bergen, Department of Physics and Technology, Bergen, Norway.
J Hazard Mater. 2006 Sep 21;137(2):752-61. doi: 10.1016/j.jhazmat.2006.04.029. Epub 2006 May 30.
In this article Eulerian-Lagrangian 2D computer simulations of consequences of primary dust explosions in two vessels connected by a duct are described. After an explosion in the primary vessel a propagation of hot pressurised gases to the secondary vessel, initially uniformly filled with dust particles, is simulated. The gas phase is described by the standard equations and it is coupled with the particulate phase through the drag force and the convective heat transfer. No chemical reaction is considered in the model since the objective was to model the system up to the time of ignition. The computation was performed for different lengths and diameters (heights) of the linking duct. Having analysed the results, it was concluded that the simulations agree with experimental observations in that the probability of transmission of an explosion from the primary to the secondary vessel decreases with decreasing diameter (height) and increasing length of the connecting pipeline. Snapshots of particle positions for different times are presented. The work illustrates the behaviour of the mixture in the secondary vessel: the particles tend to concentrate in clouds, and domains with no particles are observed. This may influence the explosion characteristics of the system.
本文描述了通过管道连接的两个容器中一次粉尘爆炸后果的欧拉 - 拉格朗日二维计算机模拟。在主容器发生爆炸后，模拟了热的加压气体向最初均匀填充有粉尘颗粒的次容器的传播。气相由标准方程描述，并通过曳力和对流换热与颗粒相耦合。模型中未考虑化学反应，因为目标是对直至着火时刻的系统进行建模。针对连接管道的不同长度和直径（高度）进行了计算。分析结果后得出结论，模拟结果与实验观察结果一致，即从主容器到次容器的爆炸传播概率随着连接管道直径（高度）的减小和长度的增加而降低。给出了不同时刻颗粒位置的快照。这项工作展示了次容器中混合物的行为：颗粒倾向于聚集成云状，并且观察到没有颗粒的区域。这可能会影响系统的爆炸特性。
