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Particle Charging in Combined Corona-Electrostatic Fields

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5 Author(s)
Dumitran, L.M. ; Dept. of Electr. Eng., Politeh. Univ. of Bucharest, Bucharest ; Blejan, O. ; Notingher, P.V. ; Samuila, A.
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The association of several ionizing and nonionizing electrodes generates combined corona-electrostatic fields, characterized by space charge zones of well-defined extensions. In a previous paper, the authors presented an effective numerical method for the computation of such fields. The aim of this present work is to show how these results can be employed for estimating the charge acquired by insulating and conducting particles when passing through the space charge zones generated by various corona-electrostatic electrode geometries. The study is done under several assumptions that authorize the use of Pauthenier's formula. Diffusion charging can be neglected, the applied electric field is quasi-uniform in the vicinity of particles, and particle speed is low compared with that of air ions. The charging model takes into account the computed spatial distribution of the electric field and charge density. The computations were performed for various values of the geometrical parameters of the electrode system and of the particle transit time through the corona discharge zone. The results can be used for the design of the electrode system of any electrostatic process employing corona discharge fields.

Published in:

Industry Applications, IEEE Transactions on  (Volume:44 ,  Issue: 5 )

Date of Publication:

Sept.-Oct. 2008

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