Charge generation and electrostatic equilibrium for single granules during sliding--颗粒学报PARTICUOLOGY

Yao, J., Zhou, F., & Zhao, Y. (2016). Charge generation and electrostatic equilibrium for single granules during sliding. Particuology, 29, 126-134. https://doi.org/10.1016/j.partic.2015.12.011

Charge generation and electrostatic equilibrium for single granules during sliding

Jun Yao ^{a b}, Fang Zhou ^b, Yanlin Zhao ^a *

a Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China
b College of Energy, Xiamen University, Xiamen 361005, China

10.1016/j.partic.2015.12.011

Volume 29, December 2016, Pages 126-134

Received 1 October 2015, Revised 12 December 2015, Accepted 18 December 2015, Available online 31 May 2016, Version of Record 18 November 2016.

E-mail: ylzhao@cup.edu.cn

Highlights

• Electrostatic equilibrium of a single granule was investigated by its repeated sliding.

• Granular sliding area, velocity and sliding times were found to have more effects on charge generation.

• Equilibrium charge could be used as a variable expressing the charging propensity of the material.

Abstract

Electrostatic phenomena are commonly observed in the processing of solids. However, the working mechanism 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 triboelectrification 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 granules 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.

Graphical abstract

Keywords

Granule; Electrostatics; Charge generation; Equilibrium; Granule shape

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