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Numerical investigation of AC arc ignition on cold electrodes in atmospheric-pressure argon

2021Journal article Open access
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dc.contributor.authorSantos, D. F. N.
dc.contributor.authorLisnyak, M
dc.contributor.authorAlmeida, N.
dc.contributor.authorBenilova, L. G.
dc.contributor.authorBenilov, M. S.
dc.date.accessioned2022-09-06T15:20:03Z
dc.date.available2022-09-06T15:20:03Z
dc.date.issued2021
dc.description.abstractSince experiments cannot clarify the mechanism of current transfer to non-thermionic arc cathodes, this can only be done by means of numerical modelling based on first principles and not relying on a priori assumptions. In this work, the first quarter-period after the ignition of an AC arc on cold electrodes in atmospheric-pressure argon is investigated by means of unified one-dimensional modelling, where the conservation and transport equations for all plasma species, the electron and heavy-particle energy equations, and the Poisson equation are solved in the whole interelectrode gap up to the electrode surfaces. Results are compared with those for DC discharges and analysed with the aim to clarify the role of different mechanisms of current transfer to non-thermionic arc cathodes. It is found that the glow-to-arc transition in the AC case occurs in a way substantially different from the quasi-stationary glow-to-arc transition. The dominant mechanisms of current transfer to the cathode during the AC arc ignition on cold electrodes are, subsequently, the displacement current, the ion current, and thermionic emission current. No indications of explosive emission are found. Electron emission from the impact of excited atoms can hardly be a dominant mechanism either. The introduction of the so-called field enhancement factor, which is used for description of field electron emission from cold cathodes in a vacuum, leads to computed cathode surface temperature values that are appreciably lower than the melting temperature of tungsten even in the quasi-stationary case. This means that pure tungsten cathodes of atmospheric-pressure argon arcs can operate without melting, in contradiction with experiments.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSantos, D. F. N., Lisnyak, M., Almeida, N. A., Benilova, L. G., & Benilov, M. S. (2021). Numerical investigation of AC arc ignition on cold electrodes in atmospheric-pressure argon. Journal of Physics D: Applied Physics, 54(19), 195202.pt_PT
dc.identifier.doi10.1088/1361-6463/abdf97pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4576
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherIOP Publishingpt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relation.publisherversionhttps://iopscience.iop.org/article/10.1088/1361-6463/abdf97/metapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectAC arc ignitionpt_PT
dc.subjectAC arc dischargespt_PT
dc.subjectNon-thermionic cathodespt_PT
dc.subjectArc dischargespt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleNumerical investigation of AC arc ignition on cold electrodes in atmospheric-pressure argonpt_PT
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.issue19pt_PT
oaire.citation.startPage195202pt_PT
oaire.citation.titleJournal of Physics D: Applied Physicspt_PT
oaire.citation.volume54pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameSantos
person.familyNameAlmeida
person.familyNameBenilov
person.givenNameDiego
person.givenNameNelson
person.givenNameMikhail
person.identifier.ciencia-idC81A-66AF-B0E2
person.identifier.ciencia-id0516-6FAA-27E2
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0002-2377-766X
person.identifier.orcid0000-0002-6499-3609
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridG-1683-2019
person.identifier.ridM-6228-2013
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id57192359233
person.identifier.scopus-author-id7003469070
person.identifier.scopus-author-id7005138676
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryba38d863-a13a-4729-b1d5-b6fe2a79d074
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