Correlation of Striated Discharge Patterns With Operating Conditions in Helium and Argon Atmospheric-Pressure Plasma Jets

Abstract

This paper presents the evolution of striated discharge patterns in helium and argon atmospheric-pressure plasma jets as a function of gas flow rate and driving voltage. The striated patterns have been observed in helium and argon plasma jets at gas flow rates above 5 and 3 L/min, respectively. The striation patterns appear over the entire voltage range used for investigation (from 4 to 8 kV) in the helium plasma jet, whereas in the argon plasma jet, striation patterns appear over a limited voltage range (from 5.5 to 6.5 kV).Index Terms-Atmospheric pressure discharge, ionization propagation wave, striated discharge patterns.

Measurements of emission-propagation phenomena in low-energy atmospheric-pressure helium plasma

“…In our experiments, such striation structures were not observed when the images were integrated over more than one applied-voltage cycle, because the striation was temporary and the streamer head propagated with a highemission intensity. This result is different from the APPJ striation reported in [16,[25][26][27][28][29][30], where striations were maintained over several cycles. Figure 4(a) shows time evolutions of the optical emission from the LEAPP, when L is 10 mm.…”

“…It appears that these emission-propagation phenomena depend on the distance between the plasma device and the treated target. Furthermore, striations have been observed in the APPJ [16,[25][26][27][28][29][30]. They were measured from images that were taken by using a high-speed camera or an intensified charge-coupled device (ICCD) camera.…”

Inhibitory effect of double atmospheric pressure argon cold plasma on spores and mycotoxin production ofAspergillus nigercontaminating date palm fruits

“…However, the double jet length shrinks at higher flow rates (>3.5 L min −1 ). The reduction in the length of one of the two jets observed at flow rate of 4.5 L min −1 might be due to striated discharge pattern formation related to the flow rate 25 or might also be related to the starting of transition from laminar flow to turbulent flow. This transition was previously observed in the case of air plasma jet 26 and helium jet.…”

Observations of multiple stationary striation phenomena in an atmospheric pressure neon plasma jet

“…29) In previous APPJ studies, the striation phenomena were also reported. [30][31][32][33] The emission intensity of each striation deceased along the APPJ, as the distance from the plasma source increased. [30][31][32] In particular, Hong et al 30) and Seo et al 32) reported that the distance between striations changed as the distance from the plasma source increased.…”

“…[30][31][32][33] The emission intensity of each striation deceased along the APPJ, as the distance from the plasma source increased. [30][31][32] In particular, Hong et al 30) and Seo et al 32) reported that the distance between striations changed as the distance from the plasma source increased. Kang et al 31) reported that the striation phenomenon was observed only by adding a small percentage of oxygen gas to the argon working gas.…”