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Abstract:

Langmuir probe measurements in an atmospheric pressure direct current (dc) plasma jet are reported. Sweeping probes were used. The experiment was carried out using a dc non-transferred arc torch with a rod-type cathode and an anode of 5 mm diameter. The torch was operated at a nominal power level of 15 kW with a nitrogen flow rate of 25 Nl min -1. A flat ion saturation region was found in the current-voltage curve of the probe. The ion saturation current to a cylindrical probe in a high-pressure non local thermal equilibrium (LTE) plasma was modeled. Thermal effects and ionization/recombination processes inside the probe perturbed region were taken into account. Averaged radial profiles of the electron and heavy particle temperatures as well as the electron density were obtained. An electron temperature around 11 000 K, a heavy particle temperature around 9500 K and an electron density of about 4 × 10 22 m -3, were found at the jet centre at 3.5 mm downstream from the torch exit. Large deviations from kinetic equilibrium were found throughout the plasma jet. The electron and heavy particle temperature profiles showed good agreement with those reported in the literature by using spectroscopic techniques. It was also found that the temperature radial profile based on LTE was very close to that of the electrons. The calculations have shown that this method is particularly useful for studying spraying-type plasma jets characterized by electron temperatures in the range 9000-14 000 K. © 2012 American Institute of Physics.

Registro:

Documento: Artículo
Título:Langmuir probe diagnostics of an atmospheric pressure, vortex-stabilized nitrogen plasma jet
Autor:Prevosto, L.; Kelly, H.; Mancinelli, B.R.
Filiación:Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, (2600) Venado Tuerto (Santa Fe), Argentina
Instituto de Física Del Plasma (CONICET), Departamento de Física, Facultad de Ciencias Exactas y Naturales (UBA), Ciudad Universitaria Pab. I, (1428) Buenos Aires, Argentina
Palabras clave:Current voltage curve; Direct current plasmas; Heavy particles; Ion saturation; Ion saturation current; Kinetic equilibrium; Langmuir probe diagnostics; Langmuir probe measurements; Large deviations; Nitrogen flow rates; Nominal power levels; Nonlocal thermal equilibrium; Radial profiles; Spectroscopic technique; Atmospheric pressure; Carrier concentration; Electron density measurement; Langmuir probes; Plasma jets; Probes; Electron temperature
Año:2012
Volumen:112
Número:6
DOI: http://dx.doi.org/10.1063/1.4752886
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00218979_v112_n6_p_Prevosto.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v112_n6_p_Prevosto

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Citas:

---------- APA ----------
Prevosto, L., Kelly, H. & Mancinelli, B.R. (2012) . Langmuir probe diagnostics of an atmospheric pressure, vortex-stabilized nitrogen plasma jet. Journal of Applied Physics, 112(6).
http://dx.doi.org/10.1063/1.4752886
---------- CHICAGO ----------
Prevosto, L., Kelly, H., Mancinelli, B.R. "Langmuir probe diagnostics of an atmospheric pressure, vortex-stabilized nitrogen plasma jet" . Journal of Applied Physics 112, no. 6 (2012).
http://dx.doi.org/10.1063/1.4752886
---------- MLA ----------
Prevosto, L., Kelly, H., Mancinelli, B.R. "Langmuir probe diagnostics of an atmospheric pressure, vortex-stabilized nitrogen plasma jet" . Journal of Applied Physics, vol. 112, no. 6, 2012.
http://dx.doi.org/10.1063/1.4752886
---------- VANCOUVER ----------
Prevosto, L., Kelly, H., Mancinelli, B.R. Langmuir probe diagnostics of an atmospheric pressure, vortex-stabilized nitrogen plasma jet. J Appl Phys. 2012;112(6).
http://dx.doi.org/10.1063/1.4752886