On the space-charge boundary layer inside the nozzle of a cutting torch.

Autores
Prevosto, Leandro; Kelly, Héctor; Mancinelli, Beatriz
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
A numerical study of the space-charge sheath adjacent to the nozzle wall of a cutting torch is presented. The hydrodynamic model corresponds to a collision-dominated sheath and does not assume cold ions, so drift-diffusion-type equations are used. Also an improved expression for the ion-neutral momentum transfer is employed rather than the usual constant ion-mean-free-path or constant ion collision frequency approximations. Assuming a constant electron temperature in the sheath and neglecting the electron inertial term, the continuity and momentum equations for ions and electrons, together with Poisson’s equation, were solved for the electric potential, ion velocities both normal and tangential components , and for the ion and electron densities. It was found that both the ion and electron densities present a sudden drop at the sheath-plasma edge. The ion density continues to decrease slowly inside the sheath, while the electron density presents a virtually zero value everywhere inside the sheath, the electron thermal conduction flux to the nozzle wall being negligible. These wall results thus become thermally isolated in spite of the high electron temperature in its adjacency. For a nozzle biasing voltage close to the gas breakdown, it was found that the electric field value is high, reaching a value of about 9 106 V m−1 at the exit of the nozzle wall. This value is higher than the average field value across the sheath and is on the order of the breakdown threshold value. This means that an undesired sheath breakdown could occur at the vicinities of the nozzle exit even if the average electric field across the sheath is not strong enough.
Fil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.
Fil: Kelly, Héctor. Facultad de Ciencias Exactas y Naturales (UBA). Departamento de Física. Instituto de Física ( CONICET). Buenos Aires; Argentina.
Fil: Mancinelli, Beatriz. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.
Peer Reviewed
Materia
Space-charge.
Cutting torch.
The hydrodynamic model.
Nivel de accesibilidad
acceso abierto
Condiciones de uso
2024-02-02T00:19:31Z
Repositorio
Repositorio Institucional Abierto (UTN)
Institución
Universidad Tecnológica Nacional
OAI Identificador
oai:ria.utn.edu.ar:20.500.12272/9422
Acceder
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network_acronym_str RIAUTN
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network_name_str Repositorio Institucional Abierto (UTN)
spelling On the space-charge boundary layer inside the nozzle of a cutting torch.Prevosto, LeandroKelly, HéctorMancinelli, BeatrizSpace-charge.Cutting torch.The hydrodynamic model.A numerical study of the space-charge sheath adjacent to the nozzle wall of a cutting torch is presented. The hydrodynamic model corresponds to a collision-dominated sheath and does not assume cold ions, so drift-diffusion-type equations are used. Also an improved expression for the ion-neutral momentum transfer is employed rather than the usual constant ion-mean-free-path or constant ion collision frequency approximations. Assuming a constant electron temperature in the sheath and neglecting the electron inertial term, the continuity and momentum equations for ions and electrons, together with Poisson’s equation, were solved for the electric potential, ion velocities both normal and tangential components , and for the ion and electron densities. It was found that both the ion and electron densities present a sudden drop at the sheath-plasma edge. The ion density continues to decrease slowly inside the sheath, while the electron density presents a virtually zero value everywhere inside the sheath, the electron thermal conduction flux to the nozzle wall being negligible. These wall results thus become thermally isolated in spite of the high electron temperature in its adjacency. For a nozzle biasing voltage close to the gas breakdown, it was found that the electric field value is high, reaching a value of about 9 106 V m−1 at the exit of the nozzle wall. This value is higher than the average field value across the sheath and is on the order of the breakdown threshold value. This means that an undesired sheath breakdown could occur at the vicinities of the nozzle exit even if the average electric field across the sheath is not strong enough.Fil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.Fil: Kelly, Héctor. Facultad de Ciencias Exactas y Naturales (UBA). Departamento de Física. Instituto de Física ( CONICET). Buenos Aires; Argentina.Fil: Mancinelli, Beatriz. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.Peer Reviewed2024-02-02T00:19:31Z2024-02-02T00:19:31Z2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articulopdfapplication/pdfJOURNAL OF APPLIED PHYSICS.http://hdl.handle.net/20.500.12272/942210.1063/1.3153147engM. Boulos, P. Fauchais, and E. Pfender, Thermal Plasmas, Fundamentals and Applications. ( Plenum, New York, 1994), Volumen 1.JOURNAL OF APPLIED PHYSICS 105, 123303; 2009.info:eu-repo/semantics/openAccess2024-02-02T00:19:31Zhttp://creativecommons.org/licenses/by-nc-nd/4.0/Attribution-NonCommercial-NoDerivatives 4.0 InternacionalPrevosto, Leandro.Creative Commons http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Este trabajo puede ser utilizado con fines académicos y de estudio. reponame:Repositorio Institucional Abierto (UTN)instname:Universidad Tecnológica Nacional2026-09-24T12:45:09Zoai:ria.utn.edu.ar:20.500.12272/9422instacron:UTNInstitucionalhttp://ria.utn.edu.ar/Universidad públicaNo correspondehttp://ria.utn.edu.ar/oaigestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:a2026-09-24 12:45:10.974Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacionalfalse
dc.title.none.fl_str_mv On the space-charge boundary layer inside the nozzle of a cutting torch.
title On the space-charge boundary layer inside the nozzle of a cutting torch.
spellingShingle On the space-charge boundary layer inside the nozzle of a cutting torch.
Prevosto, Leandro
Space-charge.
Cutting torch.
The hydrodynamic model.
title_short On the space-charge boundary layer inside the nozzle of a cutting torch.
title_full On the space-charge boundary layer inside the nozzle of a cutting torch.
title_fullStr On the space-charge boundary layer inside the nozzle of a cutting torch.
title_full_unstemmed On the space-charge boundary layer inside the nozzle of a cutting torch.
title_sort On the space-charge boundary layer inside the nozzle of a cutting torch.
dc.creator.none.fl_str_mv Prevosto, Leandro
Kelly, Héctor
Mancinelli, Beatriz
author Prevosto, Leandro
author_facet Prevosto, Leandro
Kelly, Héctor
Mancinelli, Beatriz
author_role author
author2 Kelly, Héctor
Mancinelli, Beatriz
author2_role author
author
dc.subject.none.fl_str_mv Space-charge.
Cutting torch.
The hydrodynamic model.
topic Space-charge.
Cutting torch.
The hydrodynamic model.
dc.description.none.fl_txt_mv A numerical study of the space-charge sheath adjacent to the nozzle wall of a cutting torch is presented. The hydrodynamic model corresponds to a collision-dominated sheath and does not assume cold ions, so drift-diffusion-type equations are used. Also an improved expression for the ion-neutral momentum transfer is employed rather than the usual constant ion-mean-free-path or constant ion collision frequency approximations. Assuming a constant electron temperature in the sheath and neglecting the electron inertial term, the continuity and momentum equations for ions and electrons, together with Poisson’s equation, were solved for the electric potential, ion velocities both normal and tangential components , and for the ion and electron densities. It was found that both the ion and electron densities present a sudden drop at the sheath-plasma edge. The ion density continues to decrease slowly inside the sheath, while the electron density presents a virtually zero value everywhere inside the sheath, the electron thermal conduction flux to the nozzle wall being negligible. These wall results thus become thermally isolated in spite of the high electron temperature in its adjacency. For a nozzle biasing voltage close to the gas breakdown, it was found that the electric field value is high, reaching a value of about 9 106 V m−1 at the exit of the nozzle wall. This value is higher than the average field value across the sheath and is on the order of the breakdown threshold value. This means that an undesired sheath breakdown could occur at the vicinities of the nozzle exit even if the average electric field across the sheath is not strong enough.
Fil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.
Fil: Kelly, Héctor. Facultad de Ciencias Exactas y Naturales (UBA). Departamento de Física. Instituto de Física ( CONICET). Buenos Aires; Argentina.
Fil: Mancinelli, Beatriz. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.
Peer Reviewed
description A numerical study of the space-charge sheath adjacent to the nozzle wall of a cutting torch is presented. The hydrodynamic model corresponds to a collision-dominated sheath and does not assume cold ions, so drift-diffusion-type equations are used. Also an improved expression for the ion-neutral momentum transfer is employed rather than the usual constant ion-mean-free-path or constant ion collision frequency approximations. Assuming a constant electron temperature in the sheath and neglecting the electron inertial term, the continuity and momentum equations for ions and electrons, together with Poisson’s equation, were solved for the electric potential, ion velocities both normal and tangential components , and for the ion and electron densities. It was found that both the ion and electron densities present a sudden drop at the sheath-plasma edge. The ion density continues to decrease slowly inside the sheath, while the electron density presents a virtually zero value everywhere inside the sheath, the electron thermal conduction flux to the nozzle wall being negligible. These wall results thus become thermally isolated in spite of the high electron temperature in its adjacency. For a nozzle biasing voltage close to the gas breakdown, it was found that the electric field value is high, reaching a value of about 9 106 V m−1 at the exit of the nozzle wall. This value is higher than the average field value across the sheath and is on the order of the breakdown threshold value. This means that an undesired sheath breakdown could occur at the vicinities of the nozzle exit even if the average electric field across the sheath is not strong enough.
publishDate 2009
dc.date.none.fl_str_mv 2009
2024-02-02T00:19:31Z
2024-02-02T00:19:31Z
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv JOURNAL OF APPLIED PHYSICS.
http://hdl.handle.net/20.500.12272/9422
10.1063/1.3153147
identifier_str_mv JOURNAL OF APPLIED PHYSICS.
10.1063/1.3153147
url http://hdl.handle.net/20.500.12272/9422
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv M. Boulos, P. Fauchais, and E. Pfender, Thermal Plasmas, Fundamentals and Applications. ( Plenum, New York, 1994), Volumen 1.
JOURNAL OF APPLIED PHYSICS 105, 123303; 2009.
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
2024-02-02T00:19:31Z
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Prevosto, Leandro.
Creative Commons http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Este trabajo puede ser utilizado con fines académicos y de estudio. 
eu_rights_str_mv openAccess
rights_invalid_str_mv 2024-02-02T00:19:31Z
http://creativecommons.org/licenses/by-nc-nd/4.0/
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Prevosto, Leandro.
Creative Commons http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Este trabajo puede ser utilizado con fines académicos y de estudio. 
dc.format.none.fl_str_mv pdf
application/pdf
dc.source.none.fl_str_mv reponame:Repositorio Institucional Abierto (UTN)
instname:Universidad Tecnológica Nacional
reponame_str Repositorio Institucional Abierto (UTN)
collection Repositorio Institucional Abierto (UTN)
instname_str Universidad Tecnológica Nacional
repository.name.fl_str_mv Repositorio Institucional Abierto (UTN) - Universidad Tecnológica Nacional
repository.mail.fl_str_mv gestionria@rec.utn.edu.ar; fsuarez@rec.utn.edu.ar
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score 13.24418

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