Features of a near-cathode region in a gliding arc discharge in air flow

Abstract

This paper describes the results of the investigation of a low-current atmospheric-pressure discharge in air flow with electrode geometry typical of the so-called gliding arc. At a current of fractions of an ampere the discharge burns in a regime of normal glow rather than in an arc regime and the area of the negative glow plasma smoothly moves over the cathode surface under the effect of gas flow. At the background of the glow discharge, occasional creation of a spark cathode spot can occur. Then the discharge becomes attached to the cathode surface and the site of current attachment does not move due to the gas flow. The site of current attachment continues its smooth displacement when the cathode spot is spontaneously extinguished. The events when the cathode spot abruptly jumps to a new place of attachment downstream are also observed.

Translational, rotational, vibrational and electron temperatures of a gliding arc discharge

“…The core plasma column has a much higher temperature than the surrounding region around it, and thus an overestimation of the size of the plasma column could underestimate the translational temperature of the plasma column and its reduced electric field strength. Korolev and associates [31] found that the reduced electric field strength of a low-current gliding arc discharge was about 30 Td with a gas temperature of about 4100 K in the plasma column. …”

“…It should be noted that there exits a significant voltage drop across the sheath region of the glow-type discharge. The voltage drop of a low-current gliding arc discharge operated at a glow-type regime was reported to be about 300 V [31,33]. In this work, a voltage drop of 300 V is taken into consideration when calculating the reduced electric field strength using Eq.…”

“…Substantial progress in studying gliding arc discharges has been achieved, including transient discharge processes [30,31], electrical characteristics [32,33], hypergravity effects [34,35] and species distributions [36][37][38], as well as the rotational and vibrational temperatures of gliding arc discharges [25][26][27][28]. However, the translational temperature of the gliding arc discharge has not been directly measured yet up to now.…”

Measurements of 3D slip velocities and plasma column lengths of a gliding arc discharge

“…5,6 Such gliding arc discharges have been widely applied to pollution control, 7-11 surface treatment, 1,12 sterilization, 13 and combustion enhancement. 14 Extensive studies have been performed on the dynamics, [15][16][17][18] physical characteristics, [19][20][21][22][23][24][25][26][27][28] and chemical mechanisms [29][30][31] involved in gliding arc discharges. Phenomenological models 21,[32][33][34] were developed to explain the discharge behavior based on accurate measurements of several important parameters, including the slip velocityṼ S (it stands for the relative velocity between the plasma columnṼ C and the gas flowṼ F , and its magnitude is jṼ S j ¼ jṼ C ÀṼ F j), and the length of the plasma column.…”

State of the art in medical applications using non-thermal atmospheric pressure plasma

“…Kono and Iwamoto (2004) Gliding arc 3 60 Korolev et al (2014), Wu et al (2015) NEAPP -320 Iwasaki et al (2008) LIBS 100 800 Nedanovska et al (2011) In 2006, Fridman reported replacing one of the electrodes in a DBD with a biological object with high capacitance and using it as a floating electrode, as shown in Fig. 8.…”