Simulation of subnanosecond streamers in atmospheric-pressure air: Effects of polarity of applied voltage pulse

AbstractThe interaction between an argon plasma jet excited using microsecond duration voltage pulses and a liquid target was examined using Thomson scattering to quantify the temporal evolution of the electron density and temperature. The electrical resistance between a liquid target and the electrical ground was varied from 1 to $$680\, \text {k}\Omega $$ 680 k Ω to mimic different conductivity liquids while the influence of the varying electrical properties on the electron dynamics within the plasma were examined. It was demonstrated that the interaction between the plasma jet and a liquid target grounded via a high resistance resulted in typical dielectric barrier discharge behaviour, with two discharge events per applied voltage pulse. Under such conditions, the electron density and temperature reached a peak of $$1\cdot 10^{15}\, \text {cm}^{-3}$$ 1 · 10 15 cm - 3 and 3.4 eV, respectively; with both rapidly decaying over several hundreds of nanoseconds. For liquid targets grounded via a low resistance, the jet behaviour transitioned to a DC-like discharge, with a single breakdown event being observed and sustained throughout the duration of each applied voltage pulse. Under such conditions, electron densities of $$2{-}3 \cdot 10^{15}\, \text {cm}^{-3}$$ 2 - 3 · 10 15 cm - 3 were detected for several microseconds. The results demonstrate that the electron dynamics in a pulsed argon plasma jet are extremely sensitive to the electrical characteristics of the target, which in the case of water, can evolve during exposure to the plasma.

Download Full-text

Effects of tuning the applied voltage pulse periods on the electroluminescence spectra of host–guest white light-emitting electrochemical cells

Physical Chemistry Chemical Physics ◽

10.1039/c8cp03008a ◽

2018 ◽

Vol 20 (27) ◽

pp. 18226-18232 ◽

Cited By ~ 14

Author(s):

Ming-Lun Wu ◽

Guan-Yu Chen ◽

Ting-An Shih ◽

Chin-Wei Lu ◽

Hai-Ching Su

Keyword(s):

White Light ◽

Applied Voltage ◽

Voltage Pulse ◽

Color Temperature ◽

Electrochemical Cells ◽

Pulse Period ◽

Light Emitting ◽

Applied Voltage Pulse

Tunable correlated color temperature of electroluminescence from white light-emitting electrochemical cells based on adjusting the voltage pulse period.

Download Full-text

Local Atomic Diffusion Triggered by Applied Voltage Pulse on Au(111) Surface.

Hyomen Kagaku ◽

10.1380/jsssj.24.187 ◽

2003 ◽

Vol 24 (3) ◽

pp. 187-193

Author(s):

Jooyoung KIM ◽

Hironaga UCHIDA ◽

Kazuhiro YOSHIDA ◽

Yoshiaki HASHIMOTO ◽

Kazuhiro NISHIMURA ◽

...

Keyword(s):

Applied Voltage ◽

Voltage Pulse ◽

Atomic Diffusion ◽

Applied Voltage Pulse

Download Full-text

Modeling and Experiment of Pulse Electrochemical Deburring on Inclined Exit Surface of Drilling Hole

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.328-330.502 ◽

2011 ◽

Vol 328-330 ◽

pp. 502-506 ◽

Cited By ~ 1

Author(s):

Ning Ma ◽

Wen Ji Xu ◽

Ze Fei Wei ◽

Gui Bing Pang

Keyword(s):

Mathematical Model ◽

Influencing Factors ◽

Applied Voltage ◽

Voltage Pulse ◽

Burr Height ◽

Exit Surface ◽

Interelectrode Gap ◽

Parametric Studies ◽

The Mathematical Model ◽

Applied Voltage Pulse

In this paper the characteristics of pulse electrochemical deburring (PECD) is analyzed through a developed mathematical model and main influencing factors such as applied voltage, pulse duty factor, deburring time, initial burr height and initial interelectrode gap on burr height have been analyzed. The paper also highlights the scheme of the developed PECD system designed to operate within the parametric limits. The calculated results obtained from the mathematical model are found to be approximately consistent with the experimental results. The results show that initial burr height h0=0.057mm is removed, and the fillet radius R=0.248mm is obtained. The present paper through various parametric studies will act as a guideline for the operation of a PECD system.

Download Full-text

The Influence of Barrier and Applied Voltage Parameters on the Impulse Surface Discharge Characteristics

Elektrichestvo ◽

10.24160/0013-5380-2020-11-17-27 ◽

2020 ◽

Vol 11 (11) ◽

pp. 17-27

Author(s):

Vadim V. VOEVODIN ◽

◽

Marina V. SOKOLOVA ◽

Viktor R. SOLOV’YEV ◽

Nikolay Yu. LYSOV ◽

...

Keyword(s):

Applied Voltage ◽

Voltage Pulse ◽

Discharge Zone ◽

Surface Discharge ◽

Initial Surface ◽

Barrier Material ◽

Dielectric Barrier ◽

Discharge Ignition ◽

Study Results ◽

Wide Range

The results from an experimental study of impulse surface discharge occurring in an electrode system containing a dielectric plate are presented. On one of its sides, the plate had a corona-producing electrode made of 50 mm thick copper foil grounded through a current shunt for measuring the discharge current. On its other side, the plate had a high-voltage electrode, to which the voltage from a pulse generator was applied. The article presents the results from measurements of the initial voltage and the sizes of the surface discharge area in air when applying single voltage pulses with different pulse front steepness in the range 0,1–3,4 kV/ms and amplitude in the range 7–15 kV. The measurements were carried out for different dielectric barrier materials with the e values from 2 to 35. The dielectric barrier thickness was 0,9–1,8 mm. The study results have shown that the initial surface discharge ignition voltage depends essentially on the voltage pulse parameters, whereas the barrier characteristics have a weaker effect on this voltage. It has been determined that the discharge has different discharge zone length and different structure depending on the dielectric barrier properties and applied voltage parameters. The streamer zone sizes decrease with increasing the barrier material e value at the same voltage pulse steepness and increase with increasing the steepness for each barrier material. The data obtained for a wide range of external conditions can be used in numerical modeling of discharge.

Download Full-text

Study of Dielectric Barrier Discharge in Air and Estimation of Electron Density and Energy Deposition

Journal of Science and Engineering ◽

10.3126/jsce.v7i0.26780 ◽

2019 ◽

Vol 7 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Bhesh Bahadur Thapa ◽

Raju Bhai Tyata

Keyword(s):

Dielectric Barrier Discharge ◽

Electron Density ◽

Applied Voltage ◽

Atmospheric Pressure ◽

Barrier Discharge ◽

Plasma Reactor ◽

Atmospheric Pressure Plasma ◽

Half Cycle ◽

Voltage Versus ◽

Dielectric Barrier

This paper reports the electrical behaviors of atmospheric pressure plasma reactor with Dielectric Barrier Discharge (DBD) in air medium. The DBD discharge was generated in air at atmospheric pressure using Disc Electrode Geometry (DEG) reactor powered by ac voltage (0-7kV) at a frequency of 24kHz. The glass plates of thickness 1.0mm and 3.0mm were used as dielectric. The current-voltage characteristics were studied for two air gap of 2.0mm and 3.0mm by varying the applied voltages. The numbers of filamentary micro discharges were found as increased in each half cycle with increase in power. The observations of Lissajous figure of applied voltage versus electric current was used for measuring energy deposited by discharge and also compared with calculated value. Lissajous figures clearly show that the energy deposited by discharge was dependent on applied voltage. The electron density of discharge was measured by power balance method. Electron density was found in the order of 1017 per cubic meter.

Download Full-text