Self-organized pattern formation of an atmospheric pressure plasma jet in a dielectric barrier discharge configuration

Abstract

This letter reports the observation of self-organized patterns formed in a 29mm wide atmospheric pressure plasma jet. By altering the gas flow rate and/or the applied voltage, the plasma jet is seen to have at least three different modes, namely, a diffuse-looking discharge, a self-organized discharge, and an unstable discharge with randomly occurring plasma channels. The self-organized discharge mode is characterized by several bright plasma channels embedded in a diffuse and dim plasma background. These plasma channels are regularly spaced from each other and their self-organized patterns are shown to evolve abruptly.

Simulation study of one-dimensional self-organized pattern in an atmospheric-pressure dielectric barrier discharge

“…The above pattern structures are much similar to the experimental results. 16,24 It is worth mentioning that each discharge state presented in Fig. 2 is calculated over 100 periods or even over 200 periods (depending on the applied voltage amplitudes) to reach stable state.…”

“…A variety of self-organized patterns, such as the one-dimensional pattern, 16 concentric-ring, 17 spiral pattern, 18 hexagon, 19 etc., [20][21][22] have been found in various atmospheric-pressure systems, even in the atmosphericpressure plasma jet. 23,24 However, because the patterned discharge is very sensitive to controlling parameters, and a small variation in discharge parameters may cause the discharge behavior to change from a self-organized pattern to another one, even from a stationary structure to a dynamical structure, the physical mechanisms and discharge conditions that result in various self-organized patterns, as well as the temporal-spatial evolutions of patterned discharge are still not understood completely. Recently, although selforganized patterns in atmospheric-pressure DBDs have been investigated increasingly, 21,25-27 a great deal of in-depth studies on this issue are still very needed, especially the simulation studies which is the most effective way of exploring the formation and dynamics of self-organized patterns in atmospheric-pressure DBD system.…”

A simple cold Ar plasma jet generated with a floating electrode at atmospheric pressure

“…[15][16][17][18] Studies of atmospheric plasma jets have also furthered the current understanding of their generation mechanisms. 19,20 In this letter, we report a simple device with a floating electrode configuration to generate a cold atmospheric Ar plasma jet powered by a sinusoidal excitation voltage at 48 kHz. This plasma jet generator has no additional impedance matching tuner and can produce a mild cold Ar plasma jet with long plume length, low-working voltage, and long operation period.…”

Measurements of the Motion of Plasma Filaments in a Plasma Ball

“…Some forms of dielectric barrier discharges show interesting self-organized structures [7][8][9], which are understood to some extent through numerical simulations. A steady-state atmospheric pressure DBD has been made with cm-scale filament structures at ~10 kV and 45 kHz [10], but these structures do not move or branch like those in a plasma ball.…”