Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle

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We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central plasma carrying the discharge current wrapped by a relatively cold gas which thermall...

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Autores principales: Kelly, H., Minotti, F.O., Prevosto, L., Mancinelli, B.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2004
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01039733_v34_n4B_p1531_Kelly
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_01039733_v34_n4B_p1531_Kelly
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spelling paperaa:paper_01039733_v34_n4B_p1531_Kelly2023-06-12T16:46:29Z Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle Braz. J. Phys. 2004;34(4 B):1531-1537 Kelly, H. Minotti, F.O. Prevosto, L. Mancinelli, B. We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central plasma carrying the discharge current wrapped by a relatively cold gas which thermally isolates the nozzle wall from the plasma). Seeking for a solution with sonic conditions at the nozzle exit, the model allows expressing all the profiles in terms of the externally controlled parameters of the torch (geometry of the torch, discharge current, mass flow of the gas and plenum pressure) and the values of the arc and gas temperatures at the nozzle entrance. These last two values can be estimated simply appealing to energy conservation in the cathode-nozzle region. The model contains additional features compared with previous reported models, while retaining simplicity. The detailed consideration of an arc region coupled to the surrounding gas dynamics allows determining voltage drops and consequent delivered power with less assumptions than those found in other published works, and at the same time reduces the set of parameters needed to determine the solution. Fil:Kelly, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Minotti, F.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01039733_v34_n4B_p1531_Kelly
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
description We present a simple hydrodynamic model to obtain the profiles of the relevant physical quantities along a nozzle of arbitrary cross-section in a cutting torch. The model uses a two-zone approximation (a hot central plasma carrying the discharge current wrapped by a relatively cold gas which thermally isolates the nozzle wall from the plasma). Seeking for a solution with sonic conditions at the nozzle exit, the model allows expressing all the profiles in terms of the externally controlled parameters of the torch (geometry of the torch, discharge current, mass flow of the gas and plenum pressure) and the values of the arc and gas temperatures at the nozzle entrance. These last two values can be estimated simply appealing to energy conservation in the cathode-nozzle region. The model contains additional features compared with previous reported models, while retaining simplicity. The detailed consideration of an arc region coupled to the surrounding gas dynamics allows determining voltage drops and consequent delivered power with less assumptions than those found in other published works, and at the same time reduces the set of parameters needed to determine the solution.
format Artículo
Artículo
publishedVersion
author Kelly, H.
Minotti, F.O.
Prevosto, L.
Mancinelli, B.
spellingShingle Kelly, H.
Minotti, F.O.
Prevosto, L.
Mancinelli, B.
Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
author_facet Kelly, H.
Minotti, F.O.
Prevosto, L.
Mancinelli, B.
author_sort Kelly, H.
title Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
title_short Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
title_full Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
title_fullStr Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
title_full_unstemmed Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
title_sort hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
publishDate 2004
url http://hdl.handle.net/20.500.12110/paper_01039733_v34_n4B_p1531_Kelly
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AT prevostol hydrodynamicmodelfortheplasmagasflowinacuttingtorchnozzle
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