Original scientific paper
The validity of using the transport parameters of the Townsend discharge in the simulation of the RF and DBD discharges by the fluid model
B. Ardjani
; Physics Department, Science Faculty, University of Tlemcen, Algeria
B. Liani
; Physics Department, Science Faculty, University of Tlemcen, Algeria
Abstract
The fluid model has recently been used in several domains like the simulation of the discharges that use the sinusoidal electric field as in the RF and DBD discharges. In this work, the validity of using the transport parameters of the Townsend discharge in the simulation of the ac discharges by the fluid model method is studied. Generally in the ac discharges, the drift velocity of the dc discharge is taken multiplied by sin(ωt), and the reaction rates and the diffusion coefficient are taken constant. These suppositions are well tested. It is confirmed that the drift velocity of the dc electric field can be used multiplied by sin(ωt) in the simulation of the ac discharges by the fluid model if the first non-equilibrium and the difference on the negative side are neglected. The ionization frequency of the dc field multiplied by sin(ωt) should be used with caution in the simulation of the ac discharges and attention should be paid to two main factors: the phase shift and the amplitude. The ionization coefficient of the dc field multiplied by sin(ωt) can’t be used for several reasons. It is not realistic to take constant reaction rates in the simulation of the ac discharges by the fluid model. The diffusion coefficients of the dc field can be used in the simulation of the ac discharges by the fluid model as constant values only in special conditions.
Keywords
RF and DBD discharges; transport parameters; Townsend discharge; fluid model; magnetohydrodynamic equation
Hrčak ID:
302723
URI
Publication date:
1.7.2009.
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