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Esipchuk, A. M.; Marotta, A.; Sharakhovskii, L. I.

doi:10.1023/a:1016753621253

Cited by 5 publications

(5 citation statements)

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“…Such cooling mechanisms do not work for magnetic displacement of the arc. On the contrary, with an increase in the magnetic field the turbulent perturbations of plasma flow grow due to the faster displacement of arc relative to the surrounding gas, which increases the heat transfer between the plasma and the electrodes [5,6]. Thus, in accordance with [15], the thermal efficiency of the heater decreases and the temperature of the electrodes increases.…”

Section: Condition For Minimum Erosionmentioning

confidence: 73%

“…) is a function of the thermal properties of the electrode material and the magnetic field. For our analysis we will use empirical relations, obtained experimentally in [5,6], for the thermal volt-equivalent U and arc spot current density j in terms of the magnetic field strength B:…”

Section: Condition For Minimum Erosionmentioning

confidence: 99%

“…This leads to differences in the erosion behaviour as a function of arc velocity between the gas-dynamic case and that with magnetic displacement of the arc. The most complex character has the effect of magnetic displacement, since it substantially influences the arc spot parameters and the characteristic features of heat transfer between the plasma and the electrode surface (see [4][5][6]). Earlier, in [7], a method of analysis and some preliminary analysis of the arc velocity effect on the erosion of the cold electrodes of EAHs were reported.…”

Section: Introductionmentioning

confidence: 99%

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Working conditions of a copper cathode with minimum erosion

Essiptchouk¹,

Sharakhovsky²,

Marotta

2003

Plasma Sources Sci. Technol.

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On the basis of experimental investigations and a simple theoretical model that regards electrode erosion as ablation of the electrode material under action of intensive heat fluxes generated by an arc spot, we give estimations of the domain of copper cathode operating regimes with minimum erosion. It is shown that the magnetic field, which is utilized for arc displacement along the electrode surface, has a number of specific limitations from the point of view of electrode erosion. These limitations are related to the variation of the arc spot energy parameters with the magnetic field, which results in a variation in heat transfer between the electric arc and the electrode. As a consequence, an optimal magnetic field exists. For a copper electrode in air, an increase in the magnetic field above 0.08 T makes no sense, because it can only decrease the reliability of the cathode operation by growing erosion. Experimental investigations carried out confirm the results of theoretical analysis. The relationships and diagrams, which make it possible to estimate the domain of the operational conditions of a copper cathode with minimum erosion, are given.

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Section: Condition For Minimum Erosionmentioning

confidence: 73%

Section: Condition For Minimum Erosionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Working conditions of a copper cathode with minimum erosion

Essiptchouk¹,

Sharakhovsky²,

Marotta

2003

Plasma Sources Sci. Technol.

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“…Here K = (π λ 2 T 2 f )/(4aq 2 0 ); a and λ are the thermal diffusivity and conductivity of the electrode material, respectively; q 0 = jU is the arc spot heat flux density (which is a function of the applied magnetic field B, [1,3,4]), U is the volt-equivalent of the arc spot heat flux and j is the arc spot current density. The time τ 0 depends only on the thermophysical properties of the electrode material, magnetic field B and surface temperature T .…”

Section: Resultsmentioning

confidence: 99%

“…The employment of a magnetic field makes it possible to attain the largest velocities of the arc. On the other hand, a magnetic field exerts an ambiguous influence on the erosion because of the dependence on the magnetic field of the arc spot energy characteristics, such as the volt-equivalent of the heat flux U and the current density in the spot j (see [1][2][3][4]).…”

Section: Introductionmentioning

confidence: 99%

The effect of surface electrode temperature on cold electrode erosion behaviour

Essiptchouk¹,

Sharakhovsky²,

Marotta³

2006

Plasma Sources Sci. Technol.

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This work presents an experimental study of copper cathode erosion in magnetically driven arcs as a function of electrode temperature. The experiments were carried out in air at atmospheric pressure. A critical temperature of about 500-600 K for the transition from micro-to macro-erosion was found for magnetic fields in the range 0.01-0.35 T. We show that the electrode temperature is the main parameter that determines erosion, especially in the macro-erosion regime when it strongly increases with temperature. The obtained experimental data can be represented as an exponential function of the time for the electrode surface to reach the fusion temperature underneath the arc root.

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