The effect of liquid target on a nonthermal plasma jet—imaging, electric fields, visualization of gas flow and optical emission spectroscopy

Abstract

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Spatial‐temporal evolutions of surface discharge patterns generated on dielectric target interacted with a plasma jet

“…As mentioned before, positive ions or electrons are accumulated on the dielectric, which induce surface discharge in streamer regime . Let us suppose a positive streamer begins to propagate on the right side of the center, which leaves an electropositive trail .…”

“…The interaction can also be affected by target permittivity. A cathode glow is observed on the surface of high‐permittivity target (water) during propagation of the backward bullet . For higher permittivity, charges are accumulated on the target, which induces surface discharges in a streamer regime .…”

“…A cathode glow is observed on the surface of high‐permittivity target (water) during propagation of the backward bullet . For higher permittivity, charges are accumulated on the target, which induces surface discharges in a streamer regime . These surface discharges present strong interactions between each other on dielectric targets interacting with plasma jets .…”

Investigation of mode interconversion for interfacial pattern formation through plasma–surface interaction

“…A method called stark polarization spectroscopy is used to detect the electric field by using OES on a forbidden line of He(2 1 P–4 1 F) and the closest allowed line of He (2 1 P–4 1 D) at 492.19 nm. The method is well described in more recent publications . The electric field strength value can be determined from the distance between the allowed and the forbidden He line and is given by the formula: where Δ λ FA is the shift of the peak of the forbidden line from the allowed line.…”

Investigation of Power Transmission of a Helium Plasma Jet to Different Dielectric Targets Considering Operating Modes

“…For plasma setups, the characteristics like emission, species generation, electrical field strength amplitude and even stability are impacted when a surface is put in close vicinity [9][10][11][12][13][14]. Thus, an increased interest has arisen in recent years in the investigation of interaction with a target made of liquid, dielectric or metal resembling specific application conditions [15][16][17][18][19]. The range of dielectric constants varies considerably ranging from low values in alumina to virtually infinity for metals.…”