颗粒速度和形体因素影响静电发生机理

Investigation of granule sliding velocity and granule shape effect on electrostatics

采用直接测量的方法获得单个颗粒沿倾斜金属板滑行后产生的静电,实验选用颗粒材料为PVC,颗粒平均粒度为2.0~5.0 mm,分别以三角形面和梯形面作为颗粒滑行的摩擦面。研究结果表明：随着颗粒滑行速度减小,产生静电量增大;颗粒的接触面积增大,产生的静电量增大;滑行次数达到一定时,颗粒产生的静电量达到饱和。综合分析,可获得颗粒粒度、形状因素、颗粒滑行速度和形体因素影响静电产生的作用机理。

The electrostatics caused by granule sliding along a metal plate was measured directly. Granule material is PVC and the mean particle size is 2.0-5.0 mm. The working-face has two kinds of shapes, triangle and trapezium. The results show that electrostatics generated increases with the decrease of the granule sliding velocity as well as with granular sliding face area. The electrostatics generated reaches saturated state after sliding several times. In the end, the mechanism of the granule sliding velocity and granule shape effect on electrostatics due to friction is obtained in terms of granule size and shape.