On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon

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Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on...

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Autores principales: Prevosto, L., Kelly, H., Mancinelli, B.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2011
Materias:
Arc plasma
Cutting torch
Experimental observation
Insulating film
Ion-current signal
Non destructive
Nonequilibrium plasmas
Nozzle orifice
Nozzle wall
Plasma dynamics
Plasma fluctuations
Power supply
Space charges
Steady state
Dynamics
Oxygen cutting
Plasma diagnostics
Plasmas
Nozzles
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00218979_v110_n8_p_Prevosto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_00218979_v110_n8_p_Prevosto
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spelling paperaa:paper_00218979_v110_n8_p_Prevosto2023-06-12T16:42:35Z On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon J Appl Phys 2011;110(8) Prevosto, L. Kelly, H. Mancinelli, B. Arc plasma Cutting torch Experimental observation Insulating film Ion-current signal Non destructive Nonequilibrium plasmas Nozzle orifice Nozzle wall Plasma dynamics Plasma fluctuations Power supply Space charges Steady state Dynamics Oxygen cutting Plasma diagnostics Plasmas Nozzles Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on the behavior of the ion current signal and simple estimations, it is concluded that (1) the non-equilibrium plasma inside the nozzle is far from the steady state in time, in contrast to what is frequently assumed. The power supply ripple was identified as the main fluctuations source and (2) large-scale plasma fluctuations inside the nozzle could cause transient (total duration of the order of 100 μs) Townsend avalanches developing in the space-charge layer located between the arc plasma and the nozzle wall. Such events trigger the so called non-destructive double-arcing phenomena without appealing to the presence of insulating films deposited inside the nozzle orifice, as was previously proposed in the literature. © 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_v110_n8_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
Cutting torch
Experimental observation
Insulating film
Ion-current signal
Non destructive
Nonequilibrium plasmas
Nozzle orifice
Nozzle wall
Plasma dynamics
Plasma fluctuations
Power supply
Space charges
Steady state
Dynamics
Oxygen cutting
Plasma diagnostics
Plasmas
Nozzles
spellingShingle Arc plasma
Cutting torch
Experimental observation
Insulating film
Ion-current signal
Non destructive
Nonequilibrium plasmas
Nozzle orifice
Nozzle wall
Plasma dynamics
Plasma fluctuations
Power supply
Space charges
Steady state
Dynamics
Oxygen cutting
Plasma diagnostics
Plasmas
Nozzles
Prevosto, L.
Kelly, H.
Mancinelli, B.
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
topic_facet Arc plasma
Cutting torch
Experimental observation
Insulating film
Ion-current signal
Non destructive
Nonequilibrium plasmas
Nozzle orifice
Nozzle wall
Plasma dynamics
Plasma fluctuations
Power supply
Space charges
Steady state
Dynamics
Oxygen cutting
Plasma diagnostics
Plasmas
Nozzles
description Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on the behavior of the ion current signal and simple estimations, it is concluded that (1) the non-equilibrium plasma inside the nozzle is far from the steady state in time, in contrast to what is frequently assumed. The power supply ripple was identified as the main fluctuations source and (2) large-scale plasma fluctuations inside the nozzle could cause transient (total duration of the order of 100 μs) Townsend avalanches developing in the space-charge layer located between the arc plasma and the nozzle wall. Such events trigger the so called non-destructive double-arcing phenomena without appealing to the presence of insulating films deposited inside the nozzle orifice, as was previously proposed in the literature. © 2011 American Institute of Physics.
format Artículo
Artículo
publishedVersion
author Prevosto, L.
Kelly, H.
Mancinelli, B.
author_facet Prevosto, L.
Kelly, H.
Mancinelli, B.
author_sort Prevosto, L.
title On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
title_short On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
title_full On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
title_fullStr On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
title_full_unstemmed On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
title_sort on the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
publishDate 2011
url http://hdl.handle.net/20.500.12110/paper_00218979_v110_n8_p_Prevosto
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AT kellyh onthedynamicsofthespacechargelayerinsidethenozzleofacuttingtorchanditsrelationwiththenondestructivedoublearcingphenomenon
AT mancinellib onthedynamicsofthespacechargelayerinsidethenozzleofacuttingtorchanditsrelationwiththenondestructivedoublearcingphenomenon
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