Research on the Time and Space Characteristic of Argon Dielectric Barrier Discharge at Atmospheric Pressure

2014 ◽  
Vol 1008-1009 ◽  
pp. 630-634
Author(s):  
Zhi Nan Liu ◽  
Hui Min Ge
Keyword(s):  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Fluid Model ◽  
Electrical Characteristics ◽  
Number Density ◽  
Plasma Parameters ◽  
One Dimensional ◽  
Space Characteristic ◽  
Discharge Gap ◽  
Bright Area

Numerical calculations with time dependant one-dimensional fluid model are performed at various conditions in argon atmospheric pressure to calculate electrical characteristics and plasma parameters including charged and metastable molecules densities. The simulation results show after steady discharge are formed, the voltage of discharge gap nearly remain constant and the phase is 0.36π advance of the applied voltage; The current density are in the same period as the applied voltage, the phase is 0.58π ahead of the applied voltage; The steady state Ar are in high number density in the whole discharge gap; The Ar* number density appear peak at the middle of the discharge gap; The Ar+ number density appear peak in the negative bright area.

The Influence of the Voltage Slope to the Homogeneous Multiple-Pulse Barrier Discharge at Atmospheric Pressure

2011 ◽  
Vol 50-51 ◽  
pp. 205-208
Author(s):  
Peng Xie ◽  
Yan Ling Liu ◽  
Shao Yan Cui
Keyword(s):  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Fluid Model ◽  
Voltage Amplitude ◽  
One Dimensional ◽  
Current Pulses ◽  
Variable Voltage ◽  
Simulation Results ◽  
Operating Factor ◽  
Polygonal Function

The homogeneous barrier discharge with multiple current pulses at atmospheric pressure in helium is numerically studied on the basis of one-dimensional fluid model .The influence of the applied periodic polygonal function voltage slope to the intervals of the corresponding current pulses and the power are discussed and analyzed.The simulation results show that ,in the case of invariable voltage amplitude and variable voltage slope,the number of current pulses , intervals of the corresponding current pulses and the operating factor of the power are changing.

Simultaneous existence of stochastic and ohmic heating in capacitive discharges

2019 ◽  
Vol 85 (2) ◽  
Author(s):  
Khristo Tarnev ◽  
Rositsa Pavlova
Keyword(s):  
Ohmic Heating ◽  
Plasma Sheath ◽  
Plasma Parameters ◽  
One Dimensional ◽  
Particle In Cell ◽  
Simultaneous Existence ◽  
Capacitive Discharges ◽  
Large Discharge ◽  
Discharge Gap ◽  
Plasma Bulk

A one-dimensional particle-in-cell/Monte Carlo (PIC/MCC) model of low-pressure capacitive discharges with a large discharge gap is presented in the paper. The results from the model are for the dependence of the plasma parameters on the pressure and on the discharge radius. The study is directed to the heating mechanisms in the discharge. It is shown that the ohmic (Joule) heating in the plasma bulk could act simultaneously with the stochastic heating in the region of the plasma–sheath boundary. In confirmation of the results of the model, experimental results showing qualitatively the same behaviour are presented.

Numerical Simulation of Atmospheric Pressure Glow Discharges in Coaxial Tube

2013 ◽  
Vol 475-476 ◽  
pp. 1567-1571
Author(s):  
Chun Xiao Zhao ◽  
Jun Lu
Keyword(s):  
Numerical Simulation ◽  
Current Pulse ◽  
Discharge Current ◽  
Atmospheric Pressure ◽  
Fluid Model ◽  
Cylindrical Geometry ◽  
One Dimensional ◽  
Glow Discharges ◽  
Coaxial Tube ◽  
Voltage Peak

The dynamics of atmospheric pressure glow discharges in coaxial tube have been numerically studied by a self-consist, one-dimensional fluid model. An asymmetric discharge current pulse, which operated in glow mode, was obtained in the cylindrical geometry. As the frequency or the voltage peak is increased, the discharge transits into a period-two state.

scholarly journals LIBS Analysis of Geomaterials: Comparative Study of Basalt Plasma Induced by TEA CO2 and Nd:YAG Laser in Air at Atmospheric Pressure

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Jelena Savovic ◽  
Milos Momcilovic ◽  
Sanja Zivkovic ◽  
Andrei Stancalie ◽  
Milan Trtica ◽  
...  
Keyword(s):  
Nd:Yag Laser ◽  
Atmospheric Pressure ◽  
Cost Effective ◽  
Laser Wavelength ◽  
Number Density ◽  
Geological Samples ◽  
Plasma Parameters ◽  
Limits Of Detection ◽  
Detection Scheme ◽  
Two Systems

We present a study of the plasma generated by transversely excited atmospheric (TEA) CO2 laser irradiation of a basalt sample. The plasma was induced in air at atmospheric pressure. The same sample was also analyzed using a commercial LIBS system based on Nd:YAG laser and time-gated detection. The main plasma parameters, temperature, and electron number density were determined and analytical capabilities of the two systems compared. Despite differences in laser wavelength, pulse duration, applied fluence, and signal detection scheme, the two systems are comparable in terms of element detectability and limits of detection. In both cases, all elements usually present in geological samples were identified. The estimated limits of detection for most elements were below 100 ppm, while for Cu, Cr, and Sr they were around or below 10 ppm. The obtained results led to the conclusion that simple, cost-effective TEA CO2 LIBS system can find applications for geological explorations.

scholarly journals GAS TEMPERATURE MEASUREMENT IN THE ACTIVE ZONE OF STREAMER DISCHARGE UNDER DIFFERENT APPLIED VOLTAGES

2021 ◽  
pp. 89-92
Author(s):  
O.V. Bolotov ◽  
V.I. Golota ◽  
G.V. Taran
Keyword(s):  
Temperature Measurement ◽  
Electronic State ◽  
Relative Intensity ◽  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Active Zone ◽  
Optical Method ◽  
Gas Temperature ◽  
Streamer Discharge ◽  
Discharge Gap

The experimental results on the gas temperature measurement in the active zone of streamer discharge in air at the atmospheric pressure are presented. The gas temperature value was obtained by the optical method for measur-ing the relative intensity of the rotational lines for the radiation of the second positive (II+) system of molecular ni-trogen, transition bands (С3Пu(0)→B3Пg(0)). It was found that in discharge gap d = 8 mm, depending on the ap-plied voltage (in the range of 6.1…7.8 kV with a step of 0.2 kV), the gas temperature varied from 609 to739 K. The unevenness of the gas temperature change in the active zone of discharge with the increase in the applied voltage is shown. This may be related to the possible changes in the rotational state of nitrogen molecules upon excitation of their electronic state by electrons.

scholarly journals Enhanced Wetting and Adhesive Properties by Atmospheric Pressure Plasma Surface Treatment Methods and Investigation Processes on the Influencing Parameters on HIPS Polymer

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 901
Author(s):  
Miklós Berczeli ◽  
Zoltán Weltsch
Keyword(s):  
Surface Treatment ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
High Impact ◽  
Plasma Parameters ◽  
Plasma Surface ◽  
Wetting Properties ◽  
High Impact Polystyrene ◽  
Process Modification ◽  
Plasma Surface Treatment

The development of bonding technology and coating technologies require the use of modern materials and topologies for the demanding effect and modification of their wetting properties. For the industry, a process modification process that can be integrated into a process is the atmospheric pressure of air operation plasma surface treatment. This can be classified and evaluated based on the wettability, which has a significant impact on the adhesive force. The aim is to improve the wetting properties and to find the relationship between plasma treatment parameters, wetting, and adhesion. High Impact PolyStyrene (HIPS) was used as an experimental material, and then the plasma treatment can be treated with various adjustable parameters. The effect of plasma parameters on surface roughness, wetting contact angle, and using Fowkes theory of the surface energy have been investigated. Seven different plasma jet treatment distances were tested, combined with 5 scan speeds. Samples with the best plasma parameters were prepared from 25 mm × 25 mm overlapping adhesive joints using acrylic/cyanoacrylate. The possibility of creating a completely hydrophilic surface was achieved, where the untreated wetting edge angle decreased from 88.2° to 0° for distilled water and from 62.7° to 0° in the case of ethylene glycol. The bonding strength of High Impact PolyStyrene was increased by plasma treatment by 297%.

scholarly journals Numerical and Experimental Investigation of Longitudinal Oscillations in Hall Thrusters

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 148
Author(s):  
Vittorio Giannetti ◽  
Manuel Martín Saravia ◽  
Luca Leporini ◽  
Simone Camarri ◽  
Tommaso Andreussi
Keyword(s):  
Discharge Current ◽  
Fluid Model ◽  
Low Frequency ◽  
Hall Thruster ◽  
Hall Thrusters ◽  
Current Signal ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Breathing Mode ◽  
Spatio Temporal

One of the main oscillatory modes found ubiquitously in Hall thrusters is the so-called breathing mode. This is recognized as a relatively low-frequency (10–30 kHz), longitudinal oscillation of the discharge current and plasma parameters. In this paper, we present a synergic experimental and numerical investigation of the breathing mode in a 5 kW-class Hall thruster. To this aim, we propose the use of an informed 1D fully-fluid model to provide augmented data with respect to available experimental measurements. The experimental data consists of two datasets, i.e., the discharge current signal and the local near-plume plasma properties measured at high-frequency with a fast-diving triple Langmuir probe. The model is calibrated on the discharge current signal and its accuracy is assessed by comparing predictions against the available measurements of the near-plume plasma properties. It is shown that the model can be calibrated using the discharge current signal, which is easy to measure, and that, once calibrated, it can predict with reasonable accuracy the spatio-temporal distributions of the plasma properties, which would be difficult to measure or estimate otherwise. Finally, we describe how the augmented data obtained through the combination of experiments and calibrated model can provide insight into the breathing mode oscillations and the evolution of plasma properties.

Sign in / Sign up

Export Citation Format

Share Document