Non-LTE Argon-plasma Composition

Piotrowski, A.

doi:10.1007/s10582-005-0072-4

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…23 has pointed out the effect of different definitions of the Debye length on transport properties of argon-oxygen and nitrogen thermal plasma. Furthermore, in literature, the effect of various definitions of Debye length and lowering of ionization energy has been studied for argon plasma 28,29 which shows that the different Debye lengths differ by 61% and consequently, modify the electron number density by 8% whereas, lowering of the ionization energy decreases the electron number density by 18%. In most of the studies on two-temperature thermal plasma, the effect of different Debye lengths and lowering of ionization energy with non-equilibrium parameter h and electronic excitation has not been extensively investigated on transport properties of thermal plasma and their higher-order contributions, so a further study is necessitated to understand the physical processes involved in thermal plasma.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of thermophysical properties in two-temperature argon-helium thermal plasma

Sharma

Singh

2011

Physics of Plasmas

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The thermophysical properties of argon-helium thermal plasma have been studied in the temperature range from 5000 to 40 000 K at atmospheric pressure in local thermodynamic equilibrium and non-local thermodynamic equilibrium conditions. Two cases of thermal plasma considered are (i) ground state plasma in which all the atoms and ions are assumed to be in the ground state and (ii) excited state plasma in which atoms and ions are distributed over various possible excited states. The influence of electronic excitation and non-equilibrium parameter h ¼ T e =T h on thermodynamic properties (composition, degree of ionization, Debye length, enthalpy, and total specific heat) and transport properties (electrical conductivity, electron thermal conductivity, and thermal diffusion ratio) have been studied. Within the framework of ChapmanEnskog method, the higher-order contributions to transport coefficient and their convergence are studied. The influence of different molar compositions of argon-helium plasma mixture on convergence of higher-orders is investigated. Furthermore, the effect of different definitions of Debye length has also been examined for electrical conductivity and it is observed that electrical conductivity with the definition of Debye length (in which only electrons participate in screening) is less than that of the another definition (in which both the electrons and ions participate in screening) and this deviation increases with electron temperature. Finally, the effect of lowering of ionization energy is examined on electron number density, Debye length, and higher-order contribution to electrical conductivity. It is observed that the lowering of the ionization energy affects the electron transport-properties and consequently their higher-order contributions depending upon the value of the non-equilibrium parameter h.

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Section: Introductionmentioning

confidence: 99%

Theoretical investigation of thermophysical properties in two-temperature argon-helium thermal plasma

Sharma

Singh

2011

Physics of Plasmas

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Dynamic modeling of air–metal plasma mixture of single-turn coil with erosion at megaGauss magnetic field

Ge,

Wang,

Kang

et al. 2024

Physics of Fluids

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Single-turn coil (STC) is a destructive pulsed magnet aiming at 100–300 T magnetic field. Due to the high discharge current, the conductor of STC is heated rapidly and undergoes melting and vaporization, leading to the generation of supersonic air–metal vapor mixed plasma jet and the magneto-fluid effect. In this study, the mixed plasma mass-transfer and fluid dynamic characteristics are modeled at megaGauss magnetic field, high temperature, high pressure, and supersonic conductor shock deformation. The collision integral method is employed to calculate the fluid transport properties. In addition, a boundary constraint model of fluid–structure interaction (FSI) compatible with both fluid wall boundary condition and plasma jet entrance condition and a model to simultaneously solve the thermal ionization and high electric field ionization of the mixed vapor are proposed. As the result, the distributions of plasma electrical conductivity, current density, electron, heavy particles, temperature, air body load, and velocity are derived. Especially, the region of highest electrical conductivity is not the air domain near the inner surface of the conductor with the highest electron density and the highest magnetic field, but the air domain near the outer surface of the conductor with the relatively higher electron density and lower magnetic field.

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Calcul de composition de plasmas thermiques d’arc électrique de mélanges d’air et de vapeur d’eau

2012

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La composition de plasmas thermiques d’arcs électriques de mélanges d’air et de vapeur d’eau dans une gamme de température électronique allant de 5000 à 30 000 K est calculée pour des pressions de 1, 5 et 10 atm (1 atm = 101,325 kPa). Les plasmas étudiés étant considérés hors d’équilibre thermique, le calcul de la composition est effectué pour des déséquilibres thermiques θ = 1, 1,2 et 1,5 par deux méthodes de calcul à savoir celles de Chen et de Potapov. Le déséquilibre thermique θ est défini comme suit : θ = Te/Th où Te représente la température cinétique des électrons et Th celle des particules lourdes (molécules, atomes et ions). Les résultats obtenus sont analysés et discutés en fonction des méthodes de calcul utilisées, du déséquilibre thermique, de la pression et de la proportion initiale de la vapeur d’eau dans le mélange ayant donné naissance au plasma. L’influence de la méthode de calcul à deux températures, du déséquilibre thermique et de la pression sur la composition chimique des plasmas des mélanges étudiés est mise en évidence. Les résultats du calcul de la composition montrent en particulier que la densité numérique d’atomes d’hydrogène croît bien avec la proportion en vapeur d’eau dans le mélange.

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Non-LTE Argon-plasma Composition

Cited by 3 publications

References 24 publications

Theoretical investigation of thermophysical properties in two-temperature argon-helium thermal plasma

Theoretical investigation of thermophysical properties in two-temperature argon-helium thermal plasma

Dynamic modeling of air–metal plasma mixture of single-turn coil with erosion at megaGauss magnetic field

Calcul de composition de plasmas thermiques d’arc électrique de mélanges d’air et de vapeur d’eau

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