Modeling of an axial injection torch

Alves, L. L.; Álvarez, Rafael; Marques, L.; Rubio, Soledad; Rodero, A.; Quintero, M.C.

doi:10.1051/epjap/2009049

Cited by 10 publications

(16 citation statements)

References 23 publications

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“…This leads to the following configurations: C (Closed) The plasma expands into a closed circular waveguide, i.e. a circular wave guide with a shortcut at the end (see [18,27]). …”

Section: Configuration Plasma and Geometrymentioning

confidence: 99%

“…In selecting an appropriate model-plasma we are guided by the experimental values given in [29] and the observation given in [18,[25][26][27]. These are depicted in figure 1 where we see that, in practice, the plasma has two zones ( [18]): an ionizing and a recombining zone.…”

Section: O (Open)mentioning

confidence: 99%

“…In constructing the model we confine ourselves to the active (ionizing) part where most of the electrons are found and we will assume that this model-plasma has the simple structure of a cylindrical bar, with a constant relative permittivity r and conductivity σ (see section 3.1). The values of r and σ are obtained from a simple model for the electron momentum balance [27,30] that requires input with the wavelength; We prefer use remote field rather than far-field to avoid confusion with the terms used in antenna theory where far-field is used for large distances compared to the wavelength. values for the electron density n e , the elastic collision frequency ν eh and the electromagnetic field frequency ω (see [31]).…”

Section: O (Open)mentioning

confidence: 99%

“…After giving the EM module, it is also coupled with a plasma fluid model where flow, temperature and species equations in local thermal equilibrium are included. In [27] a closed configuration is used. It consists of a circular waveguide with a metal wall at the top (shortcut).…”

Section: Introductionmentioning

confidence: 99%

“…With this formulation and the use of the staggered Yee grid [28], the boundary conditions can be fulfilled in a more natural way, which, as we will see, speeds up the convergence process. Together with the application of a direct matrix-vector solver this leads to an enhancement of the convergence speed of more than a factor hundred as compared to the work of [27]. Another difference with the previous studies is that our study is not confined to just one configuration but that instead all three types of configurations, O, S and C are modelled and compared with each other.…”

Section: Introductionmentioning

confidence: 99%

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Effect of remote field electromagnetic boundary conditions on microwave-induced plasma torches

Jimenez-Diaz¹,

Dijk²,

Mullen³

2011

J. Phys. D: Appl. Phys.

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Abstract.A flexible versatile electromagnetic model constructed with the PLASIMO platform is employed to explore electromagnetic features of microwave induced plasma torches. The bases, formed by a full-vector formulation of the Maxwell equations, provides the possibility to formulate the boundary conditions in a natural way. Together with the use of a direct matrix solver this gives a convergence speed-up of more than a factor of 100 when compared to a scalar formulation on the azimuthal magnetic field that uses an iterative solver. As a result this electromagnetic model is ready to act in future studies as part of the self-consistent description of plasma-electromagnetic coupling. With the electromagnetic model three types of configuration were studied: the closed, semi-open and open configurations, all three based on the same simplified model-plasmas. It is found that the closed configuration, acting as a cavity for which the (de)tuning is extremely sensitive for the plasma conditions, is less suitable for applications in which changes in plasma compositions can be expected. The semi-open configuration can be seen as a model for the practice often used in laboratories to place Microwave Induced Plasma torches in a grid that aims to protect the environment against microwave electromagnetic radiation. Calculations show that this is good practice provided the radius of this cylindrical grid is in the order of 90 mm. For the most often used configuration, the open version, we found that the power balance as expressed by the coefficients of absorption, transmission and reflection, depends on the electron density of the plasma. The reason is that the plasma acts as an antenna, that converts the electromagnetic waves from the co-axial structure to that of the expansion region and that this antenna function depends on the electron density. The influence of various other antenna elements is investigated as well.

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“…This leads to the following configurations: C (Closed) The plasma expands into a closed circular waveguide, i.e. a circular wave guide with a shortcut at the end (see [18,27]). …”

Section: Configuration Plasma and Geometrymentioning

confidence: 99%

Section: O (Open)mentioning

confidence: 99%

Section: O (Open)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of remote field electromagnetic boundary conditions on microwave-induced plasma torches

Jimenez-Diaz¹,

Dijk²,

Mullen³

2011

J. Phys. D: Appl. Phys.

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Hydrodynamic study of a microwave plasma torch

Gadonna

Leroy

Silva³

et al. 2011

Eur. Phys. J. Appl. Phys.

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Microwave air plasma source at atmospheric pressure: Experiment and theory

Tatarova¹,

Dias²,

Felizardo³

et al. 2010

Journal of Applied Physics

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An experimental and theoretical investigation of the axial structure of a surface wave (2.45 GHz) driven atmospheric plasma source in air with a small admixture (1%) of water vapor has been performed. Measurements of the gas temperature and of the intensities of the O(777.4 nm), O(844.6 nm), and O(630 nm) atomic lines and the NO(γ) molecular band versus input power and axial position were carried out. Amplitude and phase sensitive measurements have also been performed to derive the surface wave dispersion characteristics. The experimental results are analyzed in terms of a one-dimensional theoretical model based on a self-consistent treatment of particle kinetics, gas dynamics, and wave electrodynamics. The predicted gas temperature and emission line intensities variations with power and axial position are shown to compare well with experiment. “Hot” excited O atoms (with kinetic energy ∼2 eV) have been detected.

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Modeling of an axial injection torch

Cited by 10 publications

References 23 publications

Effect of remote field electromagnetic boundary conditions on microwave-induced plasma torches

Effect of remote field electromagnetic boundary conditions on microwave-induced plasma torches

Hydrodynamic study of a microwave plasma torch

Microwave air plasma source at atmospheric pressure: Experiment and theory

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