Vista Equipo: Modeling of a non-transferred arc plasma torch

Modeling of a non-transferred arc plasma torch

Plasma torches are used in processing of materials and in energy industry for producing plasma, where direct currents arc torches represent the primary components of thermal plasma processes (plasma spraying, metal welding and cutting, waste treatment, biogas production, etc.). In a non-transferred...

Descripción completa

Autores Principales:	Chinè-Polito, Bruno, Mata-Coto, Manuel, Vargas-Blanco, Ivan
Formato:	Artículo
Idioma:	Español
Publicado:	Editorial Tecnológica de Costa Rica (entidad editora) 2019
Materias:	Plasma non-transferred arc torch modelling computational methods antorcha de arcó no transferido modelación métodos computacionales
Acceso en línea:	https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/4115 https://hdl.handle.net/2238/11847

id	RepoTEC11847
recordtype	dspace
spelling	RepoTEC118472020-09-25T23:12:07Z Modeling of a non-transferred arc plasma torch Modelación de una antorcha de plasma de arco no transferido Chinè-Polito, Bruno Mata-Coto, Manuel Vargas-Blanco, Ivan Plasma non-transferred arc torch modelling computational methods Plasma antorcha de arcó no transferido modelación métodos computacionales Plasma torches are used in processing of materials and in energy industry for producing plasma, where direct currents arc torches represent the primary components of thermal plasma processes (plasma spraying, metal welding and cutting, waste treatment, biogas production, etc.). In a non-transferred arc plasma torch, an electric arc can be glowed by applying a direct current between the cathode and anode, both placed inside the torch. Then, the plasma is obtained by heating, ionizing and expanding a working gas, introduced into the chamber of the torch upstream of the cathode. Experimental works carried out by observation and measurements techniques are difficult to apply in this field, owing to the specific properties of these physical phenomena. Hence, computational techniques could represent a useful tool to investigate the plasma processing, although the computational work is extremely challenging, because the physical phenomena are not independent among them and simultaneous. In this work we provide a computational model for simulating a 2D non- transferred arc plasma torch, under hypothesis of local thermodynamic equilibrium. Steady state conditions are assumed for the equations of conservation of fluid mechanics, heat transfer and electromagnetics which are modeled by the Comsol Multiphysics® 5.1 software. The plasma is considered optically thin and a net emission coefficient is used for the heat transferred by radiation mechanisms. The gas flow is modeled as laminar with a free vortex at the inlet for two kinds of axisymmetric torches, one with argon and the second one with nitrogen as working gas, respectively.   Las antorchas de plasma se usan para producir el plasma en la manufactura de materiales e industria energética, donde las antorchas de arco de corriente directa representan los componentes principales de los procesos con plasma térmico (plasma spraying, soldadura, corte de metales, tratamiento de residuos, producción de biogás, etc.). En una antorcha de plasma de arco no trasferido, se desarrolla un arco eléctrico aplicando una corriente directa entre el cátodo y el ánodo de la antorcha. Sucesivamente, el plasma se produce calentando, ionizando y expandiendo un gas alimentado a la antorcha antes de la región del cátodo. Los trabajos de laboratorio que usan técnicas de observación y de medición son de difícil aplicación, debido a las características físicas de estos fenómenos físicos. Así las técnicas computacionales pueden representar una herramienta valiosa para investigar los procesos con plasma, aunque el trabajo computacional es extremadamente desafiante, pues estos fenómenos son interdependientes y simultáneos. En este trabajo se propone un modelo computacional para simular una antorcha de plasma bidimensional de arco no trasferido en equilibrio termodinámico local. Se modelan condiciones de estado estacionario para las ecuaciones de conservación de mecánica de fluidos, trasferencia de calor y electromagnetismo en el software Comsol Multiphysics® 5.1. En la trasferencia de calor por radiación, el plasma se asume ópticamente fino y con un coeficiente de emisión neta. El flujo laminar de gas se modela con vórtice libre en la entrada para dos tipologías de antorchas axis-simétricas, respectivamente con argón y nitrógeno como gases de trabajo. 2019-03-01 2020-09-25T23:12:07Z 2020-09-25T23:12:07Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/4115 10.18845/tm.v32i1.4115 https://hdl.handle.net/2238/11847 spa https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/4115/3720 https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/4115/3778 application/pdf text/html Editorial Tecnológica de Costa Rica (entidad editora) Tecnología en marcha Journal; 2019: Vol. 32 Núm. 1: Enero-Marzo 2019; Pág 12-24 Revista Tecnología en Marcha; 2019: Vol. 32 Núm. 1: Enero-Marzo 2019; Pág 12-24 2215-3241 0379-3982
institution	Tecnológico de Costa Rica
collection	Repositorio TEC
language	Español
topic	Plasma non-transferred arc torch modelling computational methods Plasma antorcha de arcó no transferido modelación métodos computacionales
spellingShingle	Plasma non-transferred arc torch modelling computational methods Plasma antorcha de arcó no transferido modelación métodos computacionales Chinè-Polito, Bruno Mata-Coto, Manuel Vargas-Blanco, Ivan Modeling of a non-transferred arc plasma torch
description	Plasma torches are used in processing of materials and in energy industry for producing plasma, where direct currents arc torches represent the primary components of thermal plasma processes (plasma spraying, metal welding and cutting, waste treatment, biogas production, etc.). In a non-transferred arc plasma torch, an electric arc can be glowed by applying a direct current between the cathode and anode, both placed inside the torch. Then, the plasma is obtained by heating, ionizing and expanding a working gas, introduced into the chamber of the torch upstream of the cathode. Experimental works carried out by observation and measurements techniques are difficult to apply in this field, owing to the specific properties of these physical phenomena. Hence, computational techniques could represent a useful tool to investigate the plasma processing, although the computational work is extremely challenging, because the physical phenomena are not independent among them and simultaneous. In this work we provide a computational model for simulating a 2D non- transferred arc plasma torch, under hypothesis of local thermodynamic equilibrium. Steady state conditions are assumed for the equations of conservation of fluid mechanics, heat transfer and electromagnetics which are modeled by the Comsol Multiphysics® 5.1 software. The plasma is considered optically thin and a net emission coefficient is used for the heat transferred by radiation mechanisms. The gas flow is modeled as laminar with a free vortex at the inlet for two kinds of axisymmetric torches, one with argon and the second one with nitrogen as working gas, respectively.
format	Artículo
author	Chinè-Polito, Bruno Mata-Coto, Manuel Vargas-Blanco, Ivan
author_sort	Chinè-Polito, Bruno
title	Modeling of a non-transferred arc plasma torch
title_short	Modeling of a non-transferred arc plasma torch
title_full	Modeling of a non-transferred arc plasma torch
title_fullStr	Modeling of a non-transferred arc plasma torch
title_full_unstemmed	Modeling of a non-transferred arc plasma torch
title_sort	modeling of a non-transferred arc plasma torch
publisher	Editorial Tecnológica de Costa Rica (entidad editora)
publishDate	2019
url	https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/4115 https://hdl.handle.net/2238/11847
_version_	1796140754384453632
score	12.043226

Modeling of a non-transferred arc plasma torch

Ejemplares similares