Numerical analysis of frictional charging and electrostatic interaction of particles
Numerical analysis of frictional charging and electrostatic interaction of particles
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DOI：
10.1002/aic.17444
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发表时间：
2021-10-01
期刊：
影响因子：
3.7
通讯作者：
Wu, Chuan-Yu
中科院分区：
文献类型：
--
作者：
Hu, Jiawei;Pei, Chunlei;Wu, Chuan-Yu
由于颗粒和表面之间的摩擦接触而引起的摩擦起电在许多粉末处理过程中是普遍的。为了研究摩擦引起的静电充电行为，本文首次提出了一种离散元方法（DEM），实现了摩擦充电模型和静电相互作用模型。对旋转容器中颗粒和表面的电荷积累进行了数值分析和实验研究，以评价所开发的离散元模型。绝缘颗粒与绝缘壁之间摩擦起电的数值计算结果与实验测量结果吻合较好。它还表明，颗粒上的净电荷和颗粒分散的程度是充电时间的函数。此外，它揭示了摩擦引起的颗粒电荷增强颗粒分散，并提高颗粒温度由于静电相互作用。
Triboelectrification due to frictional contacts between particles and surfaces is prevalent in many powder handling processes. Aiming to explore the friction-induced electrostatic charging behavior, a discrete element method (DEM) is developed for the first time in the current article, in which a frictional charging model and electrostatic interaction models are implemented. The charge accumulation on both the particles and the surface in a rotational container is then analyzed numerically and experimentally to evaluate the developed DEM. The numerical results for the frictional electrification between insulant particles and an insulant wall agree well with the experimental measurement. It is also shown that both the net charge on the particles and the degree of the particle dispersion are a function of the charging time. Moreover, it is revealed that the friction-induced particle charge enhances particle dispersion, and increases the granular temperature due to the electrostatic interactions.