DocumentCode :
3130091
Title :
Charging of cylindrical insulating particles in mono-ionized fields
Author :
Samuila, Adrian ; Dascalescu, Lucian
Author_Institution :
Lab. d´´Electrostatique et de Mater. Dielectriques, CNRS, Grenoble, France
Volume :
4
fYear :
1996
fDate :
6-10 Oct 1996
Firstpage :
1891
Abstract :
The efficiency of many electrostatic technologies is correlated with the amount of charge acquired by particles of various shapes and sizes passing through ionized fields. Numerous papers have discussed the problem of ionic charging of spheres, which seem to approximate satisfactorily the actual particles in most industry applications. However, in certain technologies, such as separation and flocking, the particles are often cylindrical in shape, so that existing formulae cannot be used. The present paper addresses this problem from both a computational and an experimental point of view. The charge acquired by cylindrical particles of various dielectric constants was evaluated with an original computer program, based on the boundary element method of electric field analysis. The computed results show that the position of the particle respect to the electrodes changes the value of the saturation charge. The experiments were carried on a laboratory equipment provided with various types of corona electrodes. An electrometer was used to measure the charge acquired by millimeter-size calibrated cylinders of polyethylene and polyvinyl chloride, when subjected to positive or negative corona generated between these electrodes and a rotating roll electrode connected to the ground. The experimental results, which were in good agreement with the theoretical predictions, put forward a particle self-discharge effect, at field intensities beyond a well-defined threshold. This kind of information may guide the design of the electrostatic technologies based on the corona charging of granular matter
Keywords :
boundary-elements methods; charge measurement; corona; electric breakdown; electrodes; electrometers; electrostatic devices; electrostatics; space charge; boundary element method; charge acquisition; computer program; corona charging; cylindrical insulating particles charging; dielectric constants; electric field analysis; electrostatic technologies; flocking; granular matter; mono-ionized fields; particle self-discharge effect; separation; Boundary element methods; Corona; Current measurement; Dielectric constant; Electrodes; Electrostatics; Industry applications; Insulation; Laboratories; Shape;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
ISSN :
0197-2618
Print_ISBN :
0-7803-3544-9
Type :
conf
DOI :
10.1109/IAS.1996.563824
Filename :
563824
Link To Document :
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