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The Influence of Non-Equilibrium Excitation on the Electron Density in One-Dimensional MFD Channel Flow

Abstract

In previous publications, a system of equations was derived from the gas-kinetic description of a multi-component reacting plasma and employed for the calculation of one-dimensional subsonic flows. This system is now extended to include non-equilibrium excitation. No thermal or chemical equilibrium between the various components of the plasma is assumed. The components of the plasma considered are a non-reacting working fluid, an alkali metal vapour as a seeding material, ions of this seeding substance, and electrons. Three levels for the excited states are introduced. The reactions considered are excitation and ionization by electron collisions, and photo-ionization, as well as the corresponding reverse processes. For the reaction velocities, analytical equations are introduced permitting insertion of any excitation or ionization cross-sections of either experimental or theoretical origin. The method employed had been previously suggested by one of the authors. As examples, the degrees of excitation and ionization in the flow of a helium working fluid with 1% caesium seeding through a channel against transverse magnetic fields of 15 and 40 kg at Mach numbers of 0.7 and 0.8, respectively, were calculated. The results of the calculations show that for relatively small magnetic fields there is no rapid rise of the ionization to  More>>
Authors:
Eichert, K.; Kaeppeler, H. J. [1] 
  1. Institut fuer Plasmaforschung der Technischen Hochschule Stuttgart, Federal Republic of Germany (Germany)
Publication Date:
Oct 15, 1966
Product Type:
Conference
Report Number:
IAEA-SM-74/48
Resource Relation:
Conference: Symposium on Magnetohydrodynamic Electrical Power Generation, Salzburg (Austria), 4-8 Jul 1966; Other Information: 7 refs., 12 figs.; Related Information: In: Electricity from MHD. Vol. I. Proceedings of a Symposium on Magnetohydrodynamic Electrical Power Generation| 728 p.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CESIUM; COMPARATIVE EVALUATIONS; CROSS SECTIONS; ELECTRON COLLISIONS; ELECTRON DENSITY; ELECTRON TEMPERATURE; ELECTRONS; EQUATIONS; EQUILIBRIUM; EXCITATION; EXCITED STATES; HELIUM; MAGNETIC FIELDS; ONE-DIMENSIONAL CALCULATIONS; PLASMA; SUBSONIC FLOW; VAPORS; WORKING FLUIDS
OSTI ID:
22113839
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); European Nuclear Energy Agency of the OECD, Issy-les-Moulineaux (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M1725070821
Submitting Site:
INIS
Size:
page(s) 571-582
Announcement Date:
Jul 20, 2013

Citation Formats

Eichert, K., and Kaeppeler, H. J. The Influence of Non-Equilibrium Excitation on the Electron Density in One-Dimensional MFD Channel Flow. IAEA: N. p., 1966. Web.
Eichert, K., & Kaeppeler, H. J. The Influence of Non-Equilibrium Excitation on the Electron Density in One-Dimensional MFD Channel Flow. IAEA.
Eichert, K., and Kaeppeler, H. J. 1966. "The Influence of Non-Equilibrium Excitation on the Electron Density in One-Dimensional MFD Channel Flow." IAEA.
@misc{etde_22113839,
title = {The Influence of Non-Equilibrium Excitation on the Electron Density in One-Dimensional MFD Channel Flow}
author = {Eichert, K., and Kaeppeler, H. J.}
abstractNote = {In previous publications, a system of equations was derived from the gas-kinetic description of a multi-component reacting plasma and employed for the calculation of one-dimensional subsonic flows. This system is now extended to include non-equilibrium excitation. No thermal or chemical equilibrium between the various components of the plasma is assumed. The components of the plasma considered are a non-reacting working fluid, an alkali metal vapour as a seeding material, ions of this seeding substance, and electrons. Three levels for the excited states are introduced. The reactions considered are excitation and ionization by electron collisions, and photo-ionization, as well as the corresponding reverse processes. For the reaction velocities, analytical equations are introduced permitting insertion of any excitation or ionization cross-sections of either experimental or theoretical origin. The method employed had been previously suggested by one of the authors. As examples, the degrees of excitation and ionization in the flow of a helium working fluid with 1% caesium seeding through a channel against transverse magnetic fields of 15 and 40 kg at Mach numbers of 0.7 and 0.8, respectively, were calculated. The results of the calculations show that for relatively small magnetic fields there is no rapid rise of the ionization to Saha-equilibrium as a function of electron temperature. A comparison with the results of a calculation neglecting excitation shows that especially for relatively large magnetic fields non-equilibrium excitation has an essential influence on the electron density and its approach to equilibrium. Neglecting excitation, there results a nearly frozen behaviour of the degree of ionization within channel lengths of technical interest for small magnetic fields. (author)}
place = {IAEA}
year = {1966}
month = {Oct}
}