Study of the discrepancy between electron temperature and gas temperature in the vicinity of the anode of an electric arc

2002 ◽  
Author(s):  
M. Razafinimanana ◽  
M. Bouaziz ◽  
A. Gleizes ◽  
S. Vacquie
Keyword(s):  
Electron Temperature ◽  
Electric Arc ◽  
Gas Temperature

Ionisationsmechanismus in der Relaxationszone schwach instationärer Stoßwellen in Argon und Krypton / Ionisation Mechanism in the Relaxation Zone oj Weakly Instationary Shock Waves in Argon and Krypton

1974 ◽  
Vol 29 (4) ◽  
pp. 568-576 ◽  
Author(s):  
G. Meinhold ◽  
F. Demmig ◽  
W. Bötticher
Keyword(s):  
Shock Waves ◽  
Shock Front ◽  
Electron Temperature ◽  
Excited States ◽  
Gas Temperature ◽  
Electron Collisions ◽  
Step Process ◽  
Gasdynamic Model ◽  
Excitation Processes ◽  
Additional Excitation

The primary ionisation relaxation up to electron densities of ne = 4·1013 cm-3 is investigated by means of 4 mm - microwave - interferometry. The values of the timedependent gas temperature Ta, and gas density na behind the shock front are calculated using a gasdynamic model which strictly takes into account the instationarity of the flow. From the results it is concluded that neither the familiar two step process dominated by atom collisions nor the assumption of additional excitation processes by electron collisions can fully describe the observed ionisation rates. There is evidence that both the ionisation rates and the electron temperature are influenced by transitions between the first four excited states due to superelastic electron collisions. As a result the electron temperature may even exceed the gas temperature.

Spektroskopische Diagnostik eines nichtthermischen He-Plasmas in der Hochstromfackel / Spectroscopical Diagnostics of a non-thermal He-Plasma Jet

1974 ◽  
Vol 29 (11) ◽  
pp. 1690-1691
Author(s):  
H. Mauderer ◽  
G. Schmid
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Radial Distribution ◽  
Stark Effect ◽  
Plasma Jet ◽  
Low Pressure ◽  
Gas Temperature ◽  
Population Densities ◽  
Forbidden Transitions ◽  
Experimental Values

The properties of a low-pressure non-thermal He-plasma jet have been investigated. The gas temperature was obtained from the population densities of high excited He-levels. The electron density was determined both from the Stark-effect broadening of some He-lines and from the intensities of some forbidden transitions. The radial distribution of electron temperature was found by comparing the computed population densities of the He 31P level with the experimental values.

Characteristics of impact-generated plasma with different electron temperature and gas temperature

2014 ◽  
Vol 28 (18) ◽  
pp. 1450152 ◽  
Author(s):  
Jianqiao Li ◽  
Weidong Song ◽  
Jianguo Ning ◽  
Huiping Tang
Keyword(s):  
Electron Temperature ◽  
Internal Energy ◽  
Chemical Reaction ◽  
Empirical Formula ◽  
Smooth Particle Hydrodynamic ◽  
Conservation Equation ◽  
Gas Temperature ◽  
Empirical Formulas ◽  
Ionization Degree ◽  
Wide Range

The characteristics of the plasma with difference between the electron temperature and gas temperature were investigated and the relationship between the plasma ionization degree and the internal energy of a system was obtained. A group of equations included the chemical reaction equilibrium equation, the chemical reaction rate equation and the energy conservation equation were adopted to calculate the electron density, the electron temperature and the atom temperature with a given internal energy. These equations combined with Navier–Stokes (N–S) equations is solved by a smooth particle hydrodynamic (SPH) code. The charges generated in hypervelocity impacts with five different velocities are calculated and verified with the empirical formulas. The influence of a critical velocity for plasma generation is considered in the empirical formula and the parameters are fitted by the numerical results. By comparing with the results in reference, the fitted new empirical formula is verified to be reasonable and useful for a wide range of impact velocity.

Über die Anwendbarkeit der Linienumkehrmethode zur Messung der Elektronentemperatur in einem schwach ionisierten Edelgas-Alkali-Plasma

1968 ◽  
Vol 23 (5) ◽  
pp. 731-743 ◽  
Author(s):  
W. Riedmüller ◽  
G. Brederlow ◽  
M. Salvat
Keyword(s):  
Electron Temperature ◽  
Electric Current ◽  
Current Density ◽  
Atmospheric Pressure ◽  
Resonance Radiation ◽  
Rare Gas ◽  
Gas Temperature ◽  
Potassium Plasma ◽  
Reversal Temperature ◽  
General Conditions

When an electric current is passed through a rare-gas alkali plasma the electron temperature rises above the gas temperature. This effect was investigated in a streaming argon-potassium plasma at atmospheric pressure and a gas temperature of 2000 °K. The applicability of the line reversal method to the measurement of the electron temperature has been investigated. General conditions under which the electron temperature equals the line reversal temperature have been derived. In the case studied, the plasma had to be optically thick for the resonance radiation used. The electron temperature was measured with this method as a function of the current density. The results were compared with the values calculated from the theory and with the values calculated from the also measured conductivities. For electron temperatures above 2400 °K all three give the same results.

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