On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon
Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n8_p_Prevosto http://hdl.handle.net/20.500.12110/paper_00218979_v110_n8_p_Prevosto |
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paper:paper_00218979_v110_n8_p_Prevosto2023-06-08T14:42:49Z On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon Kelly, Héctor Juan Arc plasma Cutting torch Experimental observation Insulating film Ion-current signal Non destructive Nonequilibrium plasmas Nozzle orifice Nozzle wall Plasma dynamics Plasma fluctuations Power supply Space charges Steady state Dynamics Oxygen cutting Plasma diagnostics Plasmas Nozzles Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on the behavior of the ion current signal and simple estimations, it is concluded that (1) the non-equilibrium plasma inside the nozzle is far from the steady state in time, in contrast to what is frequently assumed. The power supply ripple was identified as the main fluctuations source and (2) large-scale plasma fluctuations inside the nozzle could cause transient (total duration of the order of 100 μs) Townsend avalanches developing in the space-charge layer located between the arc plasma and the nozzle wall. Such events trigger the so called non-destructive double-arcing phenomena without appealing to the presence of insulating films deposited inside the nozzle orifice, as was previously proposed in the literature. © 2011 American Institute of Physics. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n8_p_Prevosto http://hdl.handle.net/20.500.12110/paper_00218979_v110_n8_p_Prevosto |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Arc plasma Cutting torch Experimental observation Insulating film Ion-current signal Non destructive Nonequilibrium plasmas Nozzle orifice Nozzle wall Plasma dynamics Plasma fluctuations Power supply Space charges Steady state Dynamics Oxygen cutting Plasma diagnostics Plasmas Nozzles |
| spellingShingle |
Arc plasma Cutting torch Experimental observation Insulating film Ion-current signal Non destructive Nonequilibrium plasmas Nozzle orifice Nozzle wall Plasma dynamics Plasma fluctuations Power supply Space charges Steady state Dynamics Oxygen cutting Plasma diagnostics Plasmas Nozzles Kelly, Héctor Juan On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| topic_facet |
Arc plasma Cutting torch Experimental observation Insulating film Ion-current signal Non destructive Nonequilibrium plasmas Nozzle orifice Nozzle wall Plasma dynamics Plasma fluctuations Power supply Space charges Steady state Dynamics Oxygen cutting Plasma diagnostics Plasmas Nozzles |
| description |
Experimental observations on the plasma dynamics inside the nozzle of a 30 A oxygen cutting torch operated at conditions close to the double arcing are reported. It is employed a technique previously developed in our laboratory consisting in using the nozzle as a large-sized Langmuir probe. Based on the behavior of the ion current signal and simple estimations, it is concluded that (1) the non-equilibrium plasma inside the nozzle is far from the steady state in time, in contrast to what is frequently assumed. The power supply ripple was identified as the main fluctuations source and (2) large-scale plasma fluctuations inside the nozzle could cause transient (total duration of the order of 100 μs) Townsend avalanches developing in the space-charge layer located between the arc plasma and the nozzle wall. Such events trigger the so called non-destructive double-arcing phenomena without appealing to the presence of insulating films deposited inside the nozzle orifice, as was previously proposed in the literature. © 2011 American Institute of Physics. |
| author |
Kelly, Héctor Juan |
| author_facet |
Kelly, Héctor Juan |
| author_sort |
Kelly, Héctor Juan |
| title |
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| title_short |
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| title_full |
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| title_fullStr |
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| title_full_unstemmed |
On the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| title_sort |
on the dynamics of the space-charge layer inside the nozzle of a cutting torch and its relation with the "non-destructive" double-arcing phenomenon |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v110_n8_p_Prevosto http://hdl.handle.net/20.500.12110/paper_00218979_v110_n8_p_Prevosto |
| work_keys_str_mv |
AT kellyhectorjuan onthedynamicsofthespacechargelayerinsidethenozzleofacuttingtorchanditsrelationwiththenondestructivedoublearcingphenomenon |
| _version_ |
1768543786259972096 |