Electrostatic phenomena are commonly observed in the processing of solids. However. the working mech- anism of electrostatic charge generation for single granules and particularly, their electrostatic equilibria have ...Electrostatic phenomena are commonly observed in the processing of solids. However. the working mech- anism of electrostatic charge generation for single granules and particularly, their electrostatic equilibria have not been properly understood. In this work, repeated-sliding charging experiments with single granules were investigated for their electrostatic generation particularly from the perspective of tribo- electrification equilibrium. Factors including granule length-ratio, sliding face shape, sliding times, sliding area, sliding velocity, front-facing edge, and sliding-plate inclined-angle were found to have an obvious effect on granule charge generation. Length-ratio and sliding area have significant effects as the gran- ules evolved toward an equilibrium state. Equilibrium charge is suggested as a variable expressing the charging propensity of the material. In addition, under the same working conditions, a semi-cylindrical granule generates greater charge than a rectangular granule.展开更多
基金This work was supported by National Natural Science Foun- dation of China （Grant Nos. 51376153 and 51406235） Science Foundation of China University of Petroleum, Beijing （Grant No. 2462013YJRC030）. We greatly acknowledge the suggestions given by Professor Chi-Hwa Wang （National University of Singapore） on the electrostatics characterization and equilibrium charge concept in this study.
文摘Electrostatic phenomena are commonly observed in the processing of solids. However. the working mech- anism of electrostatic charge generation for single granules and particularly, their electrostatic equilibria have not been properly understood. In this work, repeated-sliding charging experiments with single granules were investigated for their electrostatic generation particularly from the perspective of tribo- electrification equilibrium. Factors including granule length-ratio, sliding face shape, sliding times, sliding area, sliding velocity, front-facing edge, and sliding-plate inclined-angle were found to have an obvious effect on granule charge generation. Length-ratio and sliding area have significant effects as the gran- ules evolved toward an equilibrium state. Equilibrium charge is suggested as a variable expressing the charging propensity of the material. In addition, under the same working conditions, a semi-cylindrical granule generates greater charge than a rectangular granule.
