Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782009000300008 |
Resumo: | The atmospheric pressure Tungsten Inert Gas (TIG) arc plasma in argon is studied combining results from emission spectroscopy temperature maps with composition data and transport parameters available from literature. Two arc currents are considered and maps are obtained for the Debye number, the number of particle in the Debye sphere, which shows values of the order of 10 or less in the core region of these arcs. This low number puts into serious question the plasma quasi-neutrality. It is striking that this circumstance occurs where Local Thermodynamical Equilibrium (LTE) is usually assumed in these discharges. It is shown that TIG arcs violate the quasi-neutrality requirements and, as such, these discharges are called 'plasma' quite improperly. Differently from previously published works, the starting point of the discussion is the experimental two-dimensional temperature maps. |
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Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) |
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Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc dischargesweldingarc physicsplasma spectroscopyLTELangmuir probesThe atmospheric pressure Tungsten Inert Gas (TIG) arc plasma in argon is studied combining results from emission spectroscopy temperature maps with composition data and transport parameters available from literature. Two arc currents are considered and maps are obtained for the Debye number, the number of particle in the Debye sphere, which shows values of the order of 10 or less in the core region of these arcs. This low number puts into serious question the plasma quasi-neutrality. It is striking that this circumstance occurs where Local Thermodynamical Equilibrium (LTE) is usually assumed in these discharges. It is shown that TIG arcs violate the quasi-neutrality requirements and, as such, these discharges are called 'plasma' quite improperly. Differently from previously published works, the starting point of the discussion is the experimental two-dimensional temperature maps.Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM2009-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782009000300008Journal of the Brazilian Society of Mechanical Sciences and Engineering v.31 n.3 2009reponame:Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online)instname:Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM)instacron:ABCM10.1590/S1678-58782009000300008info:eu-repo/semantics/openAccessVilarinho,L. O.Fanara,C.Yapp,D.Richardson,I. M.eng2009-12-04T00:00:00Zoai:scielo:S1678-58782009000300008Revistahttps://www.scielo.br/j/jbsmse/https://old.scielo.br/oai/scielo-oai.php||abcm@abcm.org.br1806-36911678-5878opendoar:2009-12-04T00:00Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) - Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM)false |
dc.title.none.fl_str_mv |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
title |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
spellingShingle |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges Vilarinho,L. O. welding arc physics plasma spectroscopy LTE Langmuir probes |
title_short |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
title_full |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
title_fullStr |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
title_full_unstemmed |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
title_sort |
Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges |
author |
Vilarinho,L. O. |
author_facet |
Vilarinho,L. O. Fanara,C. Yapp,D. Richardson,I. M. |
author_role |
author |
author2 |
Fanara,C. Yapp,D. Richardson,I. M. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Vilarinho,L. O. Fanara,C. Yapp,D. Richardson,I. M. |
dc.subject.por.fl_str_mv |
welding arc physics plasma spectroscopy LTE Langmuir probes |
topic |
welding arc physics plasma spectroscopy LTE Langmuir probes |
description |
The atmospheric pressure Tungsten Inert Gas (TIG) arc plasma in argon is studied combining results from emission spectroscopy temperature maps with composition data and transport parameters available from literature. Two arc currents are considered and maps are obtained for the Debye number, the number of particle in the Debye sphere, which shows values of the order of 10 or less in the core region of these arcs. This low number puts into serious question the plasma quasi-neutrality. It is striking that this circumstance occurs where Local Thermodynamical Equilibrium (LTE) is usually assumed in these discharges. It is shown that TIG arcs violate the quasi-neutrality requirements and, as such, these discharges are called 'plasma' quite improperly. Differently from previously published works, the starting point of the discussion is the experimental two-dimensional temperature maps. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782009000300008 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782009000300008 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1678-58782009000300008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM |
publisher.none.fl_str_mv |
Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM |
dc.source.none.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering v.31 n.3 2009 reponame:Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) instname:Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM) instacron:ABCM |
instname_str |
Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM) |
instacron_str |
ABCM |
institution |
ABCM |
reponame_str |
Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) |
collection |
Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering (Online) - Associação Brasileira de Engenharia e Ciências Mecânicas (ABCM) |
repository.mail.fl_str_mv |
||abcm@abcm.org.br |
_version_ |
1754734681439338496 |