Under the action of Brownian motion, the particles collide and coagulate each other, and the distribution of particle size will be changed.

• 颗粒的布朗运动使石墨粉尘在流动过程中彼此碰撞而出现石墨粉尘的凝并现象，由此改变了石墨粉尘的粒度分布。