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Simulation of pre-breakdown discharges in high-pressure air: II. Effect of surface protrusions

2021Journal article Open access
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dc.contributor.authorFerreira, N. G. C.
dc.contributor.authorNaidis, G. V.
dc.contributor.authorBenilov, M. S.
dc.date.accessioned2022-11-21T15:55:13Z
dc.date.available2022-11-21T15:55:13Z
dc.date.issued2021
dc.description.abstractAnalysis of deviations from the similarity law, observed at high and very high pressures in experiments on discharge ignition and breakdown in corona-like configurations, can serve as a useful, albeit inevitably indirect, source of information about microprotrusions on the surface of the electrodes. In this work, such analysis was performed by means of 2D numerical modelling. Conical or cylindrical protrusions on the surface of the inner electrode were studied and the kinetic scheme includes the electrons, one species of positive ions, and negative ions O− 2 , O−, and O− 3 . It is shown that the deviations from the similarity law, observed in the experiment, may indeed be attributed to enhanced ionization of air molecules in regions of amplified electric field near the microprotrusions. A qualitative agreement with the experiment in all the cases is achieved for protrusion heights of the order of 50 µm. Such values may appear rather high, however there is no other explanation in sight at present. The enhancement of the field electron emission from the surface of the negative electrode due to the amplification of the electric field on the microprotrusion was estimated and found insignificant in the range of values of the protrusion aspect ratio where the enhanced ionization in the gas phase is already appreciable.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFerreira, N. G. C., Naidis, G. V., & Benilov, M. S. (2021). Simulation of pre-breakdown discharges in high-pressure air: II. Effect of surface protrusions. Journal of Physics D: Applied Physics, 54(25), 255203.pt_PT
dc.identifier.doi10.1088/1361-6463/abf372pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4795
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherIOP Publishingpt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGas discharge modellingpt_PT
dc.subjectSurface protrusionspt_PT
dc.subjectBreakdown of high-pressure airpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleSimulation of pre-breakdown discharges in high-pressure air: II. Effect of surface protrusionspt_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.issue25pt_PT
oaire.citation.startPage255203pt_PT
oaire.citation.titleJournal of Physics D: Applied Physicspt_PT
oaire.citation.volume54pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameFerreira
person.familyNameNaidis
person.familyNameBenilov
person.givenNameNuno
person.givenNameGeorge
person.givenNameMikhail
person.identifier.ciencia-id5C17-5C53-4134
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0001-5938-4182
person.identifier.orcid0000-0003-2184-802X
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id56285111900
person.identifier.scopus-author-id6701765912
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.isAuthorOfPublication8605b032-ade3-4d43-b569-9b74b1c532ab
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
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