Diffuse and spot mode of cathode arc attachments in an atmospheric magnetically rotating argon arc

Tang, Chen; Wang, Cheng; Liao, Mengran; Xia, Weidong

doi:10.1088/0022-3727/49/8/085202

Cited by 20 publications

(31 citation statements)

References 47 publications

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“…The interest in the modelling of plasma-electrode interaction in high-pressure arc discharges has signi…cantly increased in the last couple of years [1][2][3][4][5][6][7][8][9][10][11][12]. Models of various levels of complexity have been developed for the plasma-cathode interaction.…”

Section: Introductionmentioning

confidence: 99%

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Almeida¹,

Cunha²,

Benilov³

2017

J. Phys. D: Appl. Phys.

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Numerical modelling of near-anode layers in arc discharges in several gases (Ar, Xe, and Hg) is performed in a wide range of current densities, anode surface temperatures, and plasma pressures. It is shown that the density of energy ‡ux to the anode is only weakly a¤ected by the anode surface temperature and varies linearly with the current density. This allows one to interpret the results in terms of anode heating voltage (volt equivalent of the heat ‡ux to the anode). The computed data may be useful in di¤erent ways. An example considered in this work concerns the evaluation of thermal regime of anodes in the shape of a thin rod operating in the di¤use mode. Invoking the model of nonlinear surface heating for cathodes, one obtains a simple and free of empirical parameters model of thin rod electrodes applicable to dc and ac high-pressure arcs provided that no anode spots are present. The model is applied to a variety of experiments reported in the literature and a good agreement with the experimental data found.

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Section: Introductionmentioning

confidence: 99%

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Almeida¹,

Cunha²,

Benilov³

2017

J. Phys. D: Appl. Phys.

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“…At the cathode surface, the total current density is expressed as (Baeva et al , 2012; Benilov and Marotta, 1995; Chen et al , 2016; Baeva, 2017): …”

Section: Description Of the Modelmentioning

confidence: 99%

“…The voltage drop in the ionization layer U i and the sheath layer U d are predicted as (Chen et al, 2016):…”

Section: Heating Of the Cathodementioning

confidence: 99%

“…In Chen et al (2016), Chen et al (2017) and Sun et al (2017), we reported a two-temperature model for arc plasmas, aimed at unifying the thermionic cathode, the near cathode-region and the arc column. In sheath layer, the Poisson equation is solved including the influence of the ion density, the electron density due to thermionic emission and back diffusion (Chen et al , 2017; Askari and Minoo, 2008) and a cylinder cathode shape was taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Heating of the cathode with a conical tip by atmospheric-pressure arc plasma

Liao

Tang

2019

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Purpose In this study, the authors performed a numerical investigation on the heating of a hot cathode with a conical tip by atmospheric arc, taking into account of the two temperature sheath effect for the first time. Design/methodology/approach The Schottky effect at cathode surface is considered, which is based on the analytic solution of a one-dimensional sheath model. The unified model allows one to predict the cathode-plasma heat transfer. Findings The total heat flux to cathode surface is smaller than its components’ heat flux due to electron back diffusion is as large as that due to ion flux with the increase of cathode length the total heat transported to the cathode body has an obvious decrease. Originality/value It is found that two kinds of solution exist for the cathode with a 140° conical tip; however, only one stable solution exists when the conical angle is reduced to 130°.

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“…The most important zones are the space-charge sheath, which is where the most of electrical power is deposited, and the ionization layer, which is where the ion flux to the cathode surface is formed; e.g., [25]. Models of near-cathode layers of high-pressure arc discharges based on treatment of these two zones in some or other approximations were developed in [26][27][28][29][30][31]. In this work, functions 1 ( , ) and 2 ( , ) are computed by means of the model [27] (a summary of equations of this model can be found in [32]).…”

Section: Contributions Of Radiation Emission and Absorption Inmentioning

confidence: 99%

Numerical modelling of high-pressure arc discharges: matching the LTE arc core with the electrodes

Lisnyak

Cunha

Bauchire

et al. 2017

J. Phys. D: Appl. Phys.

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A widely-used approach to simulation of high-pressure arc discharges is based on the system of magneto-hydrodynamic equations written in the approximation of local thermodynamic equilibrium (LTE). In this work, boundary conditions on the surface of the electrodes are formulated with the use of equations of balance of energy in the non-equilibrium near-electrode layers that separate the LTE bulk plasma and the electrodes. As an example, numerical simulations of a free-burning arc in atmospheric-pressure argon plasma in the current range from 20 to 200 A are reported. Simulation results are in a reasonably good agreement with those given by more sophisticated models and with the experiment. Simulations performed for cathodes of slightly different geometries have predicted a strong effect produced by details of the cathode geometry over the distribution of the current density along the cathode surface and therefore over the plasma temperature; an interesting and potentially important result worth of further numerical investigation and experimental verification.

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Diffuse and spot mode of cathode arc attachments in an atmospheric magnetically rotating argon arc

Cited by 20 publications

References 47 publications

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Heating of the cathode with a conical tip by atmospheric-pressure arc plasma

Numerical modelling of high-pressure arc discharges: matching the LTE arc core with the electrodes

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