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Numerical and experimental investigation of thermal regimes of thermionic cathodes of arc plasma torches

2023-07-04Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática
datacite.subject.fosCiências Naturais::Ciências Físicas
dc.contributor.authorCunha, M. D.
dc.contributor.authorSargsyan, M. A.
dc.contributor.authorGadzhiev, M. Kh
dc.contributor.authorTereshonok, D. V .
dc.contributor.authorBenilov, M. S .
dc.contributor.authorBenilov, Mikhail
dc.contributor.authorCunha, Mário
dc.date.accessioned2025-04-01T14:08:40Z
dc.date.available2025-04-01T14:08:40Z
dc.date.issued2023-07-04
dc.description.abstractThe modelling method based on decoupling the simulation of the cathodic part of the arc (the cathode and the near-cathode non-equilibrium plasma layer) from the simulation of the arc on the whole has been extended to cathodes of arc plasma torches, consisting of an insert with a conical tip, made of pure or doped tungsten, and a surrounding water-cooled copper holder. The method was validated by comparison with the experiment, performed on a 200 A DC arc in atmospheric-pressure argon. Standard work function of polycrystalline tungsten of 4.54 eV was used for modelling of pure-tungsten insert and a good agreement with the experiment was found with respect to both the insert tip shape and the temperature distribution in the tip, recorded in the stable operation mode. There are no unambiguous data on the work function for arc cathodes made of doped tungsten, although in situ measurements of the effective work function of cathodes of high-pressure arc discharges provide useful hints. On the other hand, the experiments reported in this work show that the tip temperatures of inserts made of tungsten doped with 1.5% of thorium, or lanthanum, or yttrium, recorded during the stable-mode operation at the arc current of 200 A, vary in a rather narrow range 3100–3200 K. This suggests that the work functions of doped tungsten inserts, operated in the stable mode, are close to each other as well. Indeed, the results of modelling with the same value of the work function of 3 eV give a reasonably good agreement with the experiment in all three cases.eng
dc.identifier.doi10.1088/1361-6463/ace063
dc.identifier.issn0022-3727
dc.identifier.issn1361-6463
dc.identifier.urihttp://hdl.handle.net/10400.13/7225
dc.language.isoeng
dc.peerreviewedyes
dc.publisherIOP Publishing
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relation.ispartofJournal of Physics D: Applied Physics
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectNumerical
dc.subjectExperimental
dc.subjectInvestigation
dc.subjectThermionic cathodes
dc.subjectHigh-pressure arc discharges
dc.subjectDeviations from local thermodynamic equilibrium
dc.subject.
dc.subjectFaculdade de Ciências Exatas e da Engenharia
dc.titleNumerical and experimental investigation of thermal regimes of thermionic cathodes of arc plasma torcheseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50010%2F2020/PT
oaire.citation.issue39
oaire.citation.titleJournal of Physics D: Applied Physics
oaire.citation.volume56
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameBenilov
person.familyNameCunha
person.givenNameMikhail
person.givenNameMário
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0001-9059-1948
person.identifier.orcid0000-0002-0397-536X
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7005138676
person.identifier.scopus-author-id7102711276
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication8509472b-5d78-47db-bfa0-51625a4e9218
relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
relation.isProjectOfPublicationc2493833-6597-4508-905f-082ca8f27b60
relation.isProjectOfPublication.latestForDiscoveryc2493833-6597-4508-905f-082ca8f27b60

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