Charge generation and electrostatic equilibrium for single granules during sliding |
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| Institution: | 1. Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China;2. College of Energy, Xiamen University, Xiamen 361005, China;1. Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland;2. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland;3. Amec Foster Wheeler, Staszica 31, 41-200 Sosnowiec, Poland;1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China;2. Dipartimento di Ingegneria Industriale, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, SA, Italy;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China |
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| 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. |
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| Keywords: | Granule Electrostatics Charge generation Equilibrium Granule shape |
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