Characteristics of an atmospheric pressure argon glow discharge in a coaxial electrode geometry

Abstract

An atmospheric glow discharge controlled by a dielectric barrier is realized in a coaxial electrode geometry in argon. The discharge characteristics are studied by the electrical method and optical emission spectroscopy. The experimental results indicate that there is only one discharge pulse per half cycle when the applied voltage is very low, and the rise time of the discharge pulses at the positive half cycle is much shorter than that at the negative one. With an increase in applied voltage, the width of the discharge pulse increases, while the inception voltage at which breakdown occurs decreases. The rise time at positive half cycle almost equals that at negative half cycle when the applied voltage is high enough. The research results pertaining to gas gap voltage indicate that the critical electric field for breakdown decreases with increasing applied voltage. The electron temperature is estimated from the Einstein relation, and the result indicates that the electron temperature and the electron density are functions of the applied voltage and the gas flow rate. The electron temperature is also studied by emission spectroscopy and a similar result is obtained.

Numerical investigation of co-axial DBD: Influence of relative permittivity of the dielectric barrier, applied voltage amplitude, and frequency

“…[17][18][19] However, the cylindrical configurations of co-axial systems adds an asymmetry due to the difference in surface areas of the electrodes and this has been shown to affect the discharge characteristics. The discharge behaviour is also modified when the dielectric barrier layer is covering just one of the electrodes.…”

“…This trend is also in accordance with the previously reported literature in a co-axial electrode configuration. 2,17 A higher current corresponds to a stronger discharge, which would translate in better decomposition efficiency of pollutants. The trends obtained for discharge current as a function of applied voltage magnitude and frequency are consistent with the experimental results of Du et al, 40 who studied the NOx removal from diesel exhaust using co-axial DBD and observed that the removal rate of NOx first increased and then decreased with increasing the magnitude and frequency of the voltage.…”

“…[13][14][15][16] However, most of these studies have been performed on DBDs between parallel-plate electrodes, whereas diagnostics on DBDs with co-axial electrode configuration are comparatively less. [17][18][19] Most of the applications of nonthermal plasma used for decomposing gaseous pollutants are performed in co-axial DBD reactors. 8,11,20 Thus, there is a need to expand on the preliminary parametric studies on coaxial electrode DBD and study the influence of process parameters on a broader range to get a complete understanding of the process.…”

Generation of Homogeneous Atmospheric-Pressure Dielectric Barrier Discharge in a Large-Gap Argon Gas

“…Ozakazi et al [15] presented the generation of a homogeneous DBD in a 2-mm Ar gap by using a 50-Hz power supply to excite wire mesh electrodes. Radu et al [16] and Dong et al [17] used 10-and 20-kHz power supplies to excite plane-parallel electrodes to generate homogeneous DBDs in 0.3-and 1.5-mm Ar gaps, respectively, and Li et al [18] generated a homogeneous DBD in a 3-mm Ar gap between coaxial electrodes using a 50-kHz power supply. By employing a radio-frequency power supply excitation, homogeneous DBDs in Ar between two plane-parallel electrodes in 1-, 2-, 4-, and 5.5-mm gaps were generated in [19], [20], [21], and [22], respectively.…”

The transition mechanism from a symmetric single period discharge to a period-doubling discharge in atmospheric helium dielectric-barrier discharge

“…[6][7][8][9] Occasionally, under certain conditions, the single period discharge may display an asymmetric discharge mode with different positive and negative current pulses. [10][11][12] Recently, more complex temporal nonlinear behaviors of APGD, such as period-doubling bifurcation and chaos, have been frequently observed in both experiments and numerical simulations. [13][14][15][16][17][18][19] Different from the single period discharge, the current pulses in period-doubling and chaos discharges repeat at multiple applied voltage cycles or fluctuate stochastically.…”