Influence of wire mesh electrodes on dielectric barrier discharge

Abstract

A dielectric barrier discharge in a 2 mm air gap was studied. The experiments show that the mesh electrode and PET film really make the discharge looking homogeneous. The breakdown onset voltage in the case of a mesh electrode and PET film is 6.4 kV, considerably lower than 8 kV, the breakdown voltage in the usual case using two spherical electrodes. The field calculations show that even with this much lower voltage the gap field in the region very close to the PET film is enhanced to a value near the breakdown field in the usual case. It may be this field enhancement that initiates a corona discharge which provides seed electrons, leading to the breakdown of the whole air gap at a lower voltage. A lower voltage applied to the gap means a lower averaged field over the gap. Because the development of an electron avalanche is very sensitive to the electric field, a small decrease in the field will depress the avalanche significantly, preventing a homogeneous discharge from transiting to filament discharge. This may be the reason why a mesh electrode and PET film make the discharge look homogeneous.

Study of dielectric barrier townsend discharge in air at atmospheric pressure

“…The arrangement of the experimental was similar to our previous works [6], shown in Figure 1. The dielectric barriers were ceramic plates with various thicknesses between 0.5~3.25mm bought from Zhuhai Yueke Tsinghua Electronic Ceramics CO., LTD.…”

“…In recent years, the generation of diffuse DBD in atmospheric air is one of the most remarkable research works in the plasma field. For obtaining a diffuse DBD in atmospheric air, many methods and special barrier materials have been explored [2][3][4][5][6][7][8][9]. Rá heǐ J found within the frequency range 1~15 kHz, a diffuse discharge could be obtained in air gaps smaller than 1.5mm at atmospheric pressure [2][3].…”

Filamentary and Homogeneous Modes of Dielectric Barrier Discharge (DBD) in Air: Investigation through Plasma Characterization and Simulation of Surface Irradiation

“…A homogeneous discharge is still advantageous than a filamentary discharge due to the uniformity rendered by the former. Unlike filamentary discharge, the discharge parameters of a homogeneous discharge can be controlled both spatially and temporally in number of ways 10–13. Besides the application prospects, studies are also focussed on the phenomenal aspects of barrier discharges and the physics governing them.…”

In-situ regeneration of Au nanocatalysts by atmospheric-pressure air plasma: Significant contribution of water vapor

“…4b, which is similar to current waveform of atmospheric pressure glow discharge in open air [39]. Generally, the generation of a glow discharge in air at atmospheric pressure mainly depends on the configuration of dielectric barrier, electrode geometry and gas flow rate [39][40][41]. Garamoon and El-zeer [39] reported atmospheric pressure glow discharge in air using porous alumina as dielectric barrier, and Wang et al [40] achieved a homogeneous looking discharge in air at atmospheric pressure using mesh electrode.…”

“…Generally, the generation of a glow discharge in air at atmospheric pressure mainly depends on the configuration of dielectric barrier, electrode geometry and gas flow rate [39][40][41]. Garamoon and El-zeer [39] reported atmospheric pressure glow discharge in air using porous alumina as dielectric barrier, and Wang et al [40] achieved a homogeneous looking discharge in air at atmospheric pressure using mesh electrode. However, in this study, the relatively uniform DBD mode of humid plasma is mainly ascribed to the contribution of water vapor because the current pulses of microdischarge gradually become less and weaker with increasing water vapor content.…”