Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique

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A two-wavelength quantitative Schlieren technique that allows inferring the electron and gas densities of axisymmetric arc plasmas without imposing any assumption regarding statistical equilibrium models is reported. This technique was applied to the study of local thermodynamic equilibrium (LTE) de...

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Autores principales: Prevosto, L., Artana, G., Kelly, H., Mancinelli, B.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2011
Materias:
Arc plasma
Axisymmetric
Chemical equilibriums
Density profile
Gas density
Gas density measurement
Heavy particles
High-energy densities
Kinetic equilibrium
Local thermodynamic equilibrium
Plasma equations
Plasma species
Quasineutrality
Saha equation
Schlieren techniques
Statistical equilibrium
Through the arcs
Two wavelength
Two-temperature
Electron temperature
Equations of state
Phase equilibria
Density of gases
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00218979_v109_n6_p_Prevosto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_00218979_v109_n6_p_Prevosto
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spelling paperaa:paper_00218979_v109_n6_p_Prevosto2023-06-12T16:42:34Z Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique J Appl Phys 2011;109(6) Prevosto, L. Artana, G. Kelly, H. Mancinelli, B. Arc plasma Axisymmetric Chemical equilibriums Density profile Gas density Gas density measurement Heavy particles High-energy densities Kinetic equilibrium Local thermodynamic equilibrium Plasma equations Plasma species Quasineutrality Saha equation Schlieren techniques Statistical equilibrium Through the arcs Two wavelength Two-temperature Electron temperature Equations of state Phase equilibria Density of gases A two-wavelength quantitative Schlieren technique that allows inferring the electron and gas densities of axisymmetric arc plasmas without imposing any assumption regarding statistical equilibrium models is reported. This technique was applied to the study of local thermodynamic equilibrium (LTE) departures within the core of a 30 A high-energy density cutting arc. In order to derive the electron and heavy particle temperatures from the inferred density profiles, a generalized two-temperature Saha equation together with the plasma equation of state and the quasineutrality condition were employed. Factors such as arc fluctuations that influence the accuracy of the measurements and the validity of the assumptions used to derive the plasma species temperature were considered. Significant deviations from chemical equilibrium as well as kinetic equilibrium were found at elevated electron temperatures and gas densities toward the arc core edge. An electron temperature profile nearly constant through the arc core with a value of about 14000-15000 K, well decoupled from the heavy particle temperature of about 1500 K at the arc core edge, was inferred. © 2011 American Institute of Physics. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00218979_v109_n6_p_Prevosto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Arc plasma
Axisymmetric
Chemical equilibriums
Density profile
Gas density
Gas density measurement
Heavy particles
High-energy densities
Kinetic equilibrium
Local thermodynamic equilibrium
Plasma equations
Plasma species
Quasineutrality
Saha equation
Schlieren techniques
Statistical equilibrium
Through the arcs
Two wavelength
Two-temperature
Electron temperature
Equations of state
Phase equilibria
Density of gases
spellingShingle Arc plasma
Axisymmetric
Chemical equilibriums
Density profile
Gas density
Gas density measurement
Heavy particles
High-energy densities
Kinetic equilibrium
Local thermodynamic equilibrium
Plasma equations
Plasma species
Quasineutrality
Saha equation
Schlieren techniques
Statistical equilibrium
Through the arcs
Two wavelength
Two-temperature
Electron temperature
Equations of state
Phase equilibria
Density of gases
Prevosto, L.
Artana, G.
Kelly, H.
Mancinelli, B.
Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
topic_facet Arc plasma
Axisymmetric
Chemical equilibriums
Density profile
Gas density
Gas density measurement
Heavy particles
High-energy densities
Kinetic equilibrium
Local thermodynamic equilibrium
Plasma equations
Plasma species
Quasineutrality
Saha equation
Schlieren techniques
Statistical equilibrium
Through the arcs
Two wavelength
Two-temperature
Electron temperature
Equations of state
Phase equilibria
Density of gases
description A two-wavelength quantitative Schlieren technique that allows inferring the electron and gas densities of axisymmetric arc plasmas without imposing any assumption regarding statistical equilibrium models is reported. This technique was applied to the study of local thermodynamic equilibrium (LTE) departures within the core of a 30 A high-energy density cutting arc. In order to derive the electron and heavy particle temperatures from the inferred density profiles, a generalized two-temperature Saha equation together with the plasma equation of state and the quasineutrality condition were employed. Factors such as arc fluctuations that influence the accuracy of the measurements and the validity of the assumptions used to derive the plasma species temperature were considered. Significant deviations from chemical equilibrium as well as kinetic equilibrium were found at elevated electron temperatures and gas densities toward the arc core edge. An electron temperature profile nearly constant through the arc core with a value of about 14000-15000 K, well decoupled from the heavy particle temperature of about 1500 K at the arc core edge, was inferred. © 2011 American Institute of Physics.
format Artículo
Artículo
publishedVersion
author Prevosto, L.
Artana, G.
Kelly, H.
Mancinelli, B.
author_facet Prevosto, L.
Artana, G.
Kelly, H.
Mancinelli, B.
author_sort Prevosto, L.
title Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
title_short Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
title_full Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
title_fullStr Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
title_full_unstemmed Departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative Schlieren technique
title_sort departures from local thermodynamic equilibrium in cutting arc plasmas derived from electron and gas density measurements using a two-wavelength quantitative schlieren technique
publishDate 2011
url http://hdl.handle.net/20.500.12110/paper_00218979_v109_n6_p_Prevosto
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AT kellyh departuresfromlocalthermodynamicequilibriumincuttingarcplasmasderivedfromelectronandgasdensitymeasurementsusingatwowavelengthquantitativeschlierentechnique
AT mancinellib departuresfromlocalthermodynamicequilibriumincuttingarcplasmasderivedfromelectronandgasdensitymeasurementsusingatwowavelengthquantitativeschlierentechnique
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