Variation of plasma parameters of vacuum arc column with gap distance

Wen, Hai‐Hu; Yuan, Zhao; He, Junjia

doi:10.7567/jjap.55.076001

Cited by 4 publications

(11 citation statements)

References 28 publications

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“…Our conclusion about the absence of an appreciable evolution of the current constriction at the anode surface for gap lengths greater than 20 mm is in conflict with Han et al simulation results, that show a monotonic increase of the constriction with the contact gap [15]. The model employed by Han et al is similar to ours.…”

Section: B Discussioncontrasting

confidence: 78%

“…The precise reason of the different influence of the gap length on current constriction at the anode predicted by both models remains unclear. One may speculate that the current density and/or the AMF strength in [15] may be too small to lead to the saturation of the current constriction at the anode surface.…”

Section: B Discussionmentioning

confidence: 99%

“…Knowledge on high-current diffuse vacuum arc has made great progress for the last fifteen years thanks to a significant number of numerical studies. Most of these studies are based on relatively similar magnetohydrodynamic (MHD) descriptions of the diffuse plasma column using a two temperature representation of the plasma [2], [5]- [12], [14], [15]. A large number of these works were inspired by the model presented by Schade and Shmelev in 2003 [2].…”

Section: Introductionmentioning

confidence: 99%

“…In [12], the constriction of VA in a large contact gap (40 mm) under various AMF radial profiles was simulated using a 3D model. More recently, Han et al [15] have performed, on the basis of a 2D model, a detailed study of the influence of a large contact gap (which was varied in the 10-50 mm range) on the behavior of the arc column. In this work, the radial and axial components of the self-magnetic field were neglected and only the case of a subsonic VA was treated.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Current Constriction in a Vacuum Arc at Large Contact Gap

Montcel

Chapelle

Creusot

et al. 2019

IEEE Trans. Plasma Sci.

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A classical two temperature magnetohydrodynamic modelling approach is used to study the influence of a large contact gap (up to 40 mm) on the behaviour of a diffuse vacuum arc controlled by a 5 mT/kA uniform external axial magnetic field between two copper electrodes with a 20 mm radius. The current constriction and energy flux density at the anode surface are more particularly analyzed, considering both supersonic and subsonic flow conditions. In the case of a supersonic arc, simulations show that the constriction of the current develops in the whole interelectrode region, but the constriction level at the anode surface does not evolve monotonically with the contact gap. The constriction is partly correlated to the radial compression of the plasma. In the case of a subsonic arc, the current constriction is related to the presence of the anode sheath. It occurs only close to the anode (from a constant distance from the anode of around 15 mm). Whereas the current constriction at the anode surface increases when the gap length goes from 10 mm to 20 mm, it no longer evolves when increasing the gap length from 20 mm to 40 mm. For both flow conditions, the evolution with the gap length of the radial profile of the energy flux density transferred by the plasma to the anode is similar as that followed by the current constriction at the anode.

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Section: B Discussioncontrasting

confidence: 78%

Section: B Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Current Constriction in a Vacuum Arc at Large Contact Gap

Montcel

Chapelle

Creusot

et al. 2019

IEEE Trans. Plasma Sci.

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“… The anode is in the passive state and generates no secondary plasma. The anode sheath is implicitly modeled considering special boundary conditions for electric potential, magnetic field, and electron energy conservation 19 , 21 , 22 , 30 , 31 . They will be further elucidated after introducing governing equations.…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical investigations of arc plasma expansion in an industrial vacuum arc remelting (VAR) process

Karimi-Sibaki

Peyha

Vakhrushev

et al. 2022

Sci Rep

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In the present study, we investigate arc plasma expansion in an industrial vacuum arc remelting (VAR) process using experimental and numerical tools. Stainless steel is the alloy of interest for the electrode (cathode) and ingot (anode). During the operation of the VAR process, behaviors of cathode spots and plasma arc were captured using the high-speed camera (Phantom v2512). We found that spots prefer to onset and remain within the partially melted surface at the center of the electrode tip. Existing spots outside the melting zone accelerate toward the edge of the electrode to extinguish. We observed a fairly symmetrical and centric plasma column during the operation. For further investigation of the observed arc column in our experiment, we used the two-fluid magnetohydrodynamics (MHD) model of plasma proposed by Braginskii. Thus, we modeled the arc column as a mixture of two continuous interpenetrating compressible fluids involving ions and electrons. Through numerical simulations, we calculated plasma parameters such as number density of ions/electrons, electric current density, flow of ions/electrons, temperature of ions/electrons, and light intensity for the observed arc column in our experiment. The calculated light intensity of plasma was compared with images captured by the camera to verify the model. The distribution of electric current density along the surface of the anode, namely ingot, is a decisive parameter that impacts the quality of the final product (ingot) in VAR process. Herein, we confirm that the traditionally used Gaussian distribution of electric current density along the surface of the ingot is viable.

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Numerical simulation of low-current vacuum arc in strong axial magnetic field taking into account the generation of secondary plasma

Shmelev

Uimanov

Wang

2017

2017 4th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST)

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Variation of plasma parameters of vacuum arc column with gap distance

Cited by 4 publications

References 28 publications

Numerical Study of the Current Constriction in a Vacuum Arc at Large Contact Gap

Numerical Study of the Current Constriction in a Vacuum Arc at Large Contact Gap

Experimental and numerical investigations of arc plasma expansion in an industrial vacuum arc remelting (VAR) process

Numerical simulation of low-current vacuum arc in strong axial magnetic field taking into account the generation of secondary plasma

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