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Simulating changes in shape of thermionic cathodes during operation of high-pressure arc discharges

2019Journal article Open access
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dc.contributor.authorCunha, M. D.
dc.contributor.authorKaufmann, H. T. C.
dc.contributor.authorSantos, D. F. N.
dc.contributor.authorBenilov, M. S.
dc.date.accessioned2022-09-06T14:18:07Z
dc.date.available2022-09-06T14:18:07Z
dc.date.issued2019
dc.description.abstractA numerical model of current transfer to thermionic cathodes of high-pressure arc discharges is developed with account of deviations from local thermodynamic equilibrium occurring near the cathode surface, in particular, of the near-cathode space-charge sheath, melting of the cathode, and motion of the molten metal under the effect of the plasma pressure, the Lorentz force, gravity, and surface tension. Modelling results are reported for a tungsten cathode of an atmospheric-pressure argon arc and the computed changes in the shape of the cathode closely resemble those observed in the experiment. The modelling has shown that the time scale of change of the cathode shape during arc operation is very sensitive to the temperature attained by the cathode. The fact that the computed time scales conform to those observed in the experiment indicate that the model of non-equilibrium near-cathode layers in high pressure arc discharges, employed in this work, predicts the cathode temperature for a given arc current with adequate accuracy. In contrast, modelling based on the assumption of local thermodynamic equilibrium in the whole arc plasma computation domain up to the cathode surface could hardly produce a similar agreement.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCunha, M. D., Kaufmann, H. T. C., Santos, D. F. N., & Benilov, M. S. (2019). Simulating changes in shape of thermionic cathodes during operation of high-pressure arc discharges. Journal of Physics D: Applied Physics, 52(50), 504004.pt_PT
dc.identifier.doi10.1088/1361-6463/ab4510pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4574
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/ab4510/metapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectThermionic cathodespt_PT
dc.subjectHigh-pressure arc dischargespt_PT
dc.subjectDeviations from local thermodynamic equilibriumpt_PT
dc.subjectMotion of the molten metalpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleSimulating changes in shape of thermionic cathodes during operation of high-pressure arc dischargespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2019/PT
oaire.citation.issue50pt_PT
oaire.citation.startPage504004pt_PT
oaire.citation.titleJournal of Physics D: Applied Physicspt_PT
oaire.citation.volume52pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCunha
person.familyNameda Costa Kaufmann
person.familyNameSantos
person.familyNameBenilov
person.givenNameMário
person.givenNameHelena Teresa
person.givenNameDiego
person.givenNameMikhail
person.identifierF-9313-2019
person.identifier.ciencia-idC81B-A663-3AA1
person.identifier.ciencia-idC81A-66AF-B0E2
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0002-0397-536X
person.identifier.orcid0000-0001-6740-2467
person.identifier.orcid0000-0002-2377-766X
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridG-1683-2019
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7102711276
person.identifier.scopus-author-id57194384877
person.identifier.scopus-author-id57192359233
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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