Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/4531 |
Resumo: | Changes in the pattern of steady-state modes of current transfer to thermionic cathodes induced by variations of the cathode geometry and temperature of the cooling fluid are studied numerically. For some combinations of control parameters, only one stable mode in a wide current range exists, which combines features of spot and diffuse modes. This mode, when attached to an elongated protrusion on the cathode surface, may be identified with the so-called super spot mode observed in experiments on low-current arcs. There is also reasonable agreement between the modelling and the experiment on cathodes of high-current arcs operating in the diffuse mode. The conclusions on existence under certain conditions of only one stable mode in a wide current range and of a minimum of the dependence of the temperature of the hottest point of the cathode on the arc current, manifested by this mode, may have industrial importance and admit a straightforward experimental verification. |
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Simulating different modes of current transfer to thermionic cathodes in a wide range of conditionsThermionic cathodesCurrent transfer.Faculdade de Ciências Exatas e da EngenhariaChanges in the pattern of steady-state modes of current transfer to thermionic cathodes induced by variations of the cathode geometry and temperature of the cooling fluid are studied numerically. For some combinations of control parameters, only one stable mode in a wide current range exists, which combines features of spot and diffuse modes. This mode, when attached to an elongated protrusion on the cathode surface, may be identified with the so-called super spot mode observed in experiments on low-current arcs. There is also reasonable agreement between the modelling and the experiment on cathodes of high-current arcs operating in the diffuse mode. The conclusions on existence under certain conditions of only one stable mode in a wide current range and of a minimum of the dependence of the temperature of the hottest point of the cathode on the arc current, manifested by this mode, may have industrial importance and admit a straightforward experimental verification.IOP PublishingDigitUMaBenilov, M. S.Cunha, M. D.Faria, M. J.2022-08-31T09:36:53Z2009-01-01T00:00:00Z2009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/4531engBenilov, M. S., Cunha, M. D., & Faria, M. J. (2009). Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions. Journal of Physics D: Applied Physics, 42(14), 145205. DOI: 10.1088/0022-3727/42/14/14520510.1088/0022-3727/42/14/145205info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:57:52Zoai:digituma.uma.pt:10400.13/4531Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:08:39.607299Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
title |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
spellingShingle |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions Benilov, M. S. Thermionic cathodes Current transfer . Faculdade de Ciências Exatas e da Engenharia |
title_short |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
title_full |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
title_fullStr |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
title_full_unstemmed |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
title_sort |
Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions |
author |
Benilov, M. S. |
author_facet |
Benilov, M. S. Cunha, M. D. Faria, M. J. |
author_role |
author |
author2 |
Cunha, M. D. Faria, M. J. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Benilov, M. S. Cunha, M. D. Faria, M. J. |
dc.subject.por.fl_str_mv |
Thermionic cathodes Current transfer . Faculdade de Ciências Exatas e da Engenharia |
topic |
Thermionic cathodes Current transfer . Faculdade de Ciências Exatas e da Engenharia |
description |
Changes in the pattern of steady-state modes of current transfer to thermionic cathodes induced by variations of the cathode geometry and temperature of the cooling fluid are studied numerically. For some combinations of control parameters, only one stable mode in a wide current range exists, which combines features of spot and diffuse modes. This mode, when attached to an elongated protrusion on the cathode surface, may be identified with the so-called super spot mode observed in experiments on low-current arcs. There is also reasonable agreement between the modelling and the experiment on cathodes of high-current arcs operating in the diffuse mode. The conclusions on existence under certain conditions of only one stable mode in a wide current range and of a minimum of the dependence of the temperature of the hottest point of the cathode on the arc current, manifested by this mode, may have industrial importance and admit a straightforward experimental verification. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-01-01T00:00:00Z 2009-01-01T00:00:00Z 2022-08-31T09:36:53Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/4531 |
url |
http://hdl.handle.net/10400.13/4531 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Benilov, M. S., Cunha, M. D., & Faria, M. J. (2009). Simulating different modes of current transfer to thermionic cathodes in a wide range of conditions. Journal of Physics D: Applied Physics, 42(14), 145205. DOI: 10.1088/0022-3727/42/14/145205 10.1088/0022-3727/42/14/145205 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IOP Publishing |
publisher.none.fl_str_mv |
IOP Publishing |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799129954753970176 |