Particle–particle collisions play a crucial role in the triboelectric charging in particle-laden flows. However, the mechanism of the charging pattern is still poorly understood. In the present work, electrostatic charging experiments of particle–particle collisions were conducted to explore the charge transfer with different-sized particles. The experimental results show that the polarity of the transferred charge varies with the material type. The influence of the initial charges on the charge transfer was observed, and the influence degree was compared for different materials. The charging behaviors were analyzed based on the charge transfer model driven by the electric potential difference. Through electrostatic analysis, the electric potential difference arising from the electric field of the preexisting surface charges was numerically calculated for the dielectric materials with polarization effects and the ideal non-polarizable material. It was revealed that the potential difference alters significantly owing to the surface charge redistribution of dielectric materials. Dielectric polarization was numerically investigated by varying particle size and relative permittivity of the material. The numerical results explain the discrepancies in the charging tendency of various materials in the experiments.

颗粒间的碰撞在充满颗粒的流动中的摩擦带电中起着至关重要的作用。但是，充电模式的机理仍知之甚少。在当前的工作中，进行了粒子与粒子碰撞的静电荷实验，以探索不同尺寸粒子的电荷转移。实验结果表明，转移电荷的极性随材料类型而变化。观察了初始电荷对电荷转移的影响，并比较了不同材料的影响程度。基于电势差驱动的电荷转移模型对充电行为进行了分析。通过静电分析 对于具有极化效应的介电材料和理想的非极化材料，数值计算了由预先存在的表面电荷的电场引起的电势差。结果表明，由于介电材料的表面电荷重新分布，电势差发生了显着变化。通过改变材料的粒径和相对介电常数，对介电极化进行了数值研究。数值结果解释了实验中各种材料带电趋势的差异。通过改变材料的粒径和相对介电常数，对介电极化进行了数值研究。数值结果解释了实验中各种材料带电趋势的差异。通过改变材料的粒径和相对介电常数，对介电极化进行了数值研究。数值结果解释了实验中各种材料带电趋势的差异。