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dc.creatorPrevosto, Leandro
dc.creatorKelly, Héctor
dc.creatorMancinelli, Beatriz
dc.date.accessioned2024-02-08T00:17:48Z
dc.date.available2024-02-08T00:17:48Z
dc.date.issued2009
dc.identifier.citationJournal of Applied Physics.es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12272/9452
dc.description.abstractThe nozzle current-voltage characteristic for a cutting arc is presented in this work. The measurements are reported using a high energy density cutting arc torch with a nozzle bore radius of 0.5 mm. The arc current was fixed at 30 A while the plenum pressure and the oxygen gas mass flow rate were varied in the range of 0.55– 0.65 MPa and 0.32– 0.54 g s−1, respectively. The results show a very low electron density and the lack of electron attachment at the plasma boundary layer. No ion saturation current was found. For the smallest mass flow rate value gas breakdown was found for a biasing nozzle potential close to that of the cathode, but no evidence of such breakdown was found for the larger mass flow rate values. Using an expression for the ion speed at the entry of the collisional sheath formed between the nonequilibrium plasma and the negatively biased nozzle wall together with a generalized Saha equation coupled to the ion branch of the characteristic, the radial profile of the electron temperature, the spatial distribution of the plasma density at the plasma boundary, and the sheath thickness were obtained. In particular, the obtained thickness value at the breakdown condition was in good agreement with that obtained from the oxygen Paschen’s curve. An electron temperature of about 4700– 5700 K and a corresponding plasma density of the order of 1019 – 1020 m−3 were found close to the nozzle wall. A physical interpretation on the origin of the double-arcing phenomenon is presented, that explains why the double-arcing (that it is established when the sheath breaks down) appears at low values of the gas mass flow.es_ES
dc.formatpdfes_ES
dc.language.isoenges_ES
dc.rightsopenAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.rights.uriAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.sourceJOURNAL OF APPLIED PHYSICS 106, 053308, 2009.es_ES
dc.subjectNozzle.es_ES
dc.subjectDouble-arcing.es_ES
dc.subjectCutting torch.es_ES
dc.subjectCurrent-voltage.es_ES
dc.titleOn the physical origin of the nozzle characteristic and its connection with the double-arcing phenomenon in a cutting torch.es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holderPrevosto, Leandro.es_ES
dc.description.affiliationFil: Prevosto, Leandro. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.es_ES
dc.description.affiliationFil: Kelly, Héctor. Facultad de Ciencias Exactas y Naturales (UBA). Departamento de Física. Instituto de Física ( CONICET). Buenos Aires; Argentina.es_ES
dc.description.affiliationFil: Mancinelli, Beatriz. Universidad Tecnológica Nacional. Facultad Regional Venado Tuerto. Departamento Ingeniería Electromecánica. Grupo de Descargas Eléctricas. Santa Fe; Argentina.es_ES
dc.description.peerreviewedPeer Reviewedes_ES
dc.type.versionacceptedVersiones_ES
dc.rights.useCreative Commons http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 Internacional Este trabajo puede ser utilizado con fines académicos y de estudio. es_ES
dc.identifier.doi10.1063/1.3041636.


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