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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >DEM simulation of different particle ejection mechanisms in a fluidized bed with and without cohesive interparticle forces
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DEM simulation of different particle ejection mechanisms in a fluidized bed with and without cohesive interparticle forces

机译：有和没有内聚颗粒间作用力的流化床中不同颗粒喷射机制的DEM模拟

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The discrete element method (DEM) is used to simulate three particle ejection mechanisms in a two-dimensional (2D) bubbling fluidized bed. The aim of the study is to analyze the particle ejection mechanisms and to investigate the effects of externally imposed interparticle forces on particle ejection. The ejection mechanisms are observed to be highly dependent on the extent of bubble coalescence. Bulge burst, which is induced by an isolated bubble eruption at the free bed surface, exhibits a regular dome contour with a lower initial velocity; wake spike, which is caused by the coalescence of two bubbles, shows a form of a spike with a higher initial velocity; jet spray, which is induced by the coalescence of more bubbles, presents continuous and violent clouds of particles. The induction of cohesive interparticle force not only delays the onset of particle ejection but also weakens its strength. The effect increases with increasing cohesive force. When cohesive force is increased to a high value, the occurrence of particle agglomeration further weakens particle ejection. For three different mechanisms, bulge burst is most sensitive to cohesive interparticle force, followed by wake spike and jet spray. (C) 2015 Elsevier B.V. All rights reserved.
机译：离散元方法（DEM）用于模拟二维（2D）鼓泡流化床中的三种粒子喷射机理。该研究的目的是分析粒子的喷射机理，并研究外部施加的粒子间作用力对粒子喷射的影响。观察到喷射机理高度依赖于气泡聚结的程度。由自由床表面孤立的气泡喷发引起的隆起爆发，呈现出规则的圆顶轮廓，初始速度较低;由两个气泡的聚结引起的尾波尖峰显示出具有较高初始速度的尖峰形式;由更多气泡聚结引起的喷射流呈现出连续而剧烈的粒子云。内聚颗粒间力的产生不仅延迟了颗粒喷射的开始，而且削弱了其强度。该效果随着内聚力的增加而增加。当内聚力增加到高值时，颗粒附聚的发生进一步削弱了颗粒的喷射。对于三种不同的机制，隆起爆发对内聚粒子间力最敏感，其次是尾波尖峰和喷射喷雾。 （C）2015 Elsevier B.V.保留所有权利。

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