The effect of the electrostatic charge of particles was investigated in fluidized beds with conductive and nonconductive walls. For this purpose, changes in the wall surface charge density and particle contact time near the wall were examined. Computational fluid dynamics/discrete element method (CFD-DEM) was utilized to simulate the accumulation of particle and wall-induced electrostatic charges in a quasi-two-dimensional fluidized bed. Particles and walls were initially considered neutral and gained charge with time. The simulations showed that aggregated particles are formed due to the presence of the opposite electrostatic charges. Agglomerates are produced by joining the aggregated particles together. Agglomerates have a layered-like structure and are made of positive and negative particles. Accumulation of these agglomerates and aggregated particles on the wall forms wall sheeting, which has a layered-like structure. In other words, particles do not accumulate on the wall individually. A significant accumulation of particles near the wall was seen in the presence of electrostatic charges compared with the neutral bed. Also, the contact time of particles on the wall in the conductive case was more prolonged than in the nonconductive case. The results indicate that the CFD-DEM approach is a helpful technique for predicting particles behaviour in the presence of the electrostatic charge.

中文翻译：

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流化床中壁板和颗粒电荷的 CFD-DEM 模拟

在具有导电和非导电壁的流化床中研究了颗粒静电荷的影响。为此，检查了壁面电荷密度和靠近壁面的颗粒接触时间的变化。计算流体动力学/离散元方法 (CFD-DEM) 用于模拟准二维流化床中颗粒和壁引起的静电荷的积累。粒子和墙壁最初被认为是中性的，并随着时间的推移获得电荷。模拟表明，由于存在相反的静电荷，形成了聚集颗粒。团聚体是通过将聚集的颗粒连接在一起而产生的。团聚体具有层状结构，由正负粒子构成。这些附聚物和聚集颗粒在壁上的积累形成了具有层状结构的壁板。换句话说，颗粒不会单独堆积在壁上。与中性床相比，在存在静电荷的情况下，可以看到靠近壁的大量颗粒积聚。此外，导电外壳中颗粒在壁上的接触时间比非导电外壳更长。结果表明，CFD-DEM 方法是一种有用的技术，可用于预测存在静电荷时的颗粒行为。与中性床相比，在存在静电荷的情况下，可以看到靠近壁的大量颗粒积聚。此外，导电外壳中颗粒在壁上的接触时间比非导电外壳更长。结果表明，CFD-DEM 方法是一种有用的技术，可用于预测存在静电荷时的颗粒行为。与中性床相比，在存在静电荷的情况下，可以看到靠近壁的大量颗粒积聚。此外，导电外壳中颗粒在壁上的接触时间比非导电外壳更长。结果表明，CFD-DEM 方法是一种有用的技术，可用于预测存在静电荷时的颗粒行为。