Volume 103, Number 3, August 2013
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||09 August 2013|
Influence of ion drag force on radial distribution of dust particles and void formation in a DC glow discharge
1 Institute of Thermophysics SB RAS - Lavrentyev Ave., 1, 630090 Novosibirsk, Russia
2 Novosibirsk State University - Pirogova St. 2, 630090 Novosibirsk, Russia
3 Joint Institute for High Temperatures RAS - Izhorskaya St. 13, bld. 2, 125412 Moscow, Russia
Received: 5 July 2013
Accepted: 30 July 2013
A model of the positive column of a DC glow discharge in argon with dust particles is presented. The model is based on the solution of the non-local Boltzmann equation for the electron energy distribution function (EEDF), the drift-diffusion equations for ions, and the Poisson equation for a self-consistent electric field. The radial distribution of dust particles density in a dust cloud is calculated according to an equilibrium Boltzmann distribution in the electrostatic field and under the action of the ion drag force. It is shown that if in the center of the discharge tube the ion drag force is larger than the electrostatic force, a dust-free region (void) in the central part of the dust cloud is formed. Otherwise (for a smaller ion drag force) the dust cloud is formed around the axis of the discharge tube without a void. In both cases, in the region of the dust cloud the ionization and recombination rates become almost equal to each other, and the radial component of the electric field is expelled from the dust cloud.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.35.Tc – Shock waves and discontinuities / 52.20.-j – Elementary processes in plasmas
© EPLA, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.