FIZIKA A 18 (2009) 3 , 107120
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 and B. LIANI
Physics Department, Science Faculty, University of Tlemcen, Algeria
Received 23 December 2008; Revised manuscript received 6 August
2009
Accepted 23 September 2009 Online 13 October 2009
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(wt), 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(wt) in the simulation of the ac discharges by the fluid model if the first
nonequilibrium and the difference on the negative side are neglected. The
ionization frequency of the dc field multiplied by sin(wt) 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(wt) 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.
PACS numbers: 52.65.Kj, 52.25.Fi, 52.80.Pi
UDC 537.525, 535.352
Keywords: RF and DBD discharges, transport parameters, Townsend discharge,
fluid model, magnetohydrodynamic equation
