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

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, Héctor Juan, Minotti, Fernando Oscar
Publicado: 2004
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01039733_v34_n4B_p1531_Kelly
http://hdl.handle.net/20.500.12110/paper_01039733_v34_n4B_p1531_Kelly
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01039733_v34_n4B_p1531_Kelly
record_format dspace
spelling paper:paper_01039733_v34_n4B_p1531_Kelly2023-06-08T15:10:28Z Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle Kelly, Héctor Juan Minotti, Fernando Oscar 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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01039733_v34_n4B_p1531_Kelly 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)
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.
author Kelly, Héctor Juan
Minotti, Fernando Oscar
spellingShingle Kelly, Héctor Juan
Minotti, Fernando Oscar
Hydrodynamic model for the plasma-gas flow in a cutting torch nozzle
author_facet Kelly, Héctor Juan
Minotti, Fernando Oscar
author_sort Kelly, Héctor Juan
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01039733_v34_n4B_p1531_Kelly
http://hdl.handle.net/20.500.12110/paper_01039733_v34_n4B_p1531_Kelly
work_keys_str_mv AT kellyhectorjuan hydrodynamicmodelfortheplasmagasflowinacuttingtorchnozzle
AT minottifernandooscar hydrodynamicmodelfortheplasmagasflowinacuttingtorchnozzle
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