The effect of electrohydrodynamic flow on the current conduction on thin ceramic powder layers under corona discharges

Author

Chang, J.S. ; Ichikawa, K.

Author_Institution

Dept. of Eng. Phys., McMaster Univ., Hamilton, Ont., Canada

fYear

1995

fDate

22-25 Oct 1995

Firstpage

392

Lastpage

395

Abstract

Dielectric ceramic powders used are silica and alumina, and experiments are conducted for applied voltage from 0 to -50 KV, dry nitrogen gas flow rate from 0 to 2.5 L/min, and mean powder size from 30 to 250 μm. Corona discharge is generated by a hollow to mesh plate electrode geometry. Gas flow is supplied from a hollow electrode and flow through the powder layer is supported by mesh electrodes. EHD flow is evaluated from pressure drop measurements. The results show that the time averaged conduction current nonmonotonically depends on the powder radius and on dielectric constants. The pressure drop characteristics, and hence EHD flow, depend on the polarity of the applied voltage

Keywords

ceramics; corona; electrical conductivity; electrohydrodynamics; plasma applications; powder technology; surface treatment; 0 to -50 kV; 30 to 250 mum; Al₂O₃; DC corona discharge induced plasma reactor; SiO₂; applied voltage polarity; corona discharge; current conduction; dielectric ceramic powders; dielectric constants; dry N₂ gas flow rate; electrohydrodynamic flow; hollow electrode; mean powder size; mesh plate electrode geometry; plasma processing; powder radius; pressure drop measurements; thin ceramic powder layers; time averaged conduction current; Ceramics; Corona; Dielectrics; Electrodes; Electrohydrodynamics; Fluid flow; Nitrogen; Powders; Silicon compounds; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1995. Annual Report., Conference on

Conference_Location

Virginia Beach, VA

Print_ISBN

0-7803-2931-7

Type

conf

DOI

10.1109/CEIDP.1995.483745

Filename

483745