Investigation and development of high-efficient thermochemical cathodes for the arc plasmatrons

Anshakov, A. S.; Kumenko, D.O.; Urbakh, E. K.; Urbakh, A. E.

doi:10.1109/korus.2005.1507716

Cited by 2 publications

(4 citation statements)

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“…However, it should be mentioned that these same authors in [33] noticed an erosion increase for a magnetically driven arc in comparison with a gasdynamically driven one. Erosion growth from 1.3 to 4.7 µg C −1 , with magnetic field increase has been reported in [32]; these authors also noticed a decrease in erosion in gasdynamically driven arcs.…”

Section: Discussionmentioning

confidence: 67%

“…On the basis of the experimental data, the value of g 0 can be taken, for a commercial copper cathode in air, approximately as a constant (3-4 µg C −1 [25,28]). Stabilization of the level of copper cathode specific erosion at certain operating conditions (lower currents, higher velocities, lower electrodes temperatures) was noted by different authors [17,31,32]. Taking into account g 0 , formula (24) should be changed to…”

Section: Discussionmentioning

confidence: 99%

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A theoretical and experimental investigation of copper electrode erosion in electric arc heaters: I. The thermophysical model

Marotta

Sharakhovsky

1996

J. Phys. D: Appl. Phys.

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A simple model is reported for copper electrode erosion in electric arc heaters as a result of electrode surface fusion by the action of the arc spot. In the analysis we substitute the real arc spot by an intensive moving surface heat source. The time evolution and the distribution of the electrode surface temperature within the arc spot is studied in coordinates coupled with the moving heat source. The electrode erosion is attributed in the model to the unbalance between the heat supply and the heat removal due to the development of an arc spot fusion zone. An erosion effective enthalpy is applied in the analysis, including all physical processes for the material transformation from the solid state into the plasma state under the action of the intensive heat flux. Formulae were obtained that enable one to calculate the electrode erosion as a function of arc velocity, electrode temperature, current, near-electrode thermal volt-equivalent, current density and electrode material properties. We show briefly that the theory agrees reasonably well with experimental results. The present model enables us to reveal the relative significance of the different parameters in the erosion process and to predict the erosion behaviour in copper electrode electric arc heaters.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

A theoretical and experimental investigation of copper electrode erosion in electric arc heaters: I. The thermophysical model

Marotta

Sharakhovsky

1996

J. Phys. D: Appl. Phys.

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“…In this problem one phase is solid and second phase is liquid Zr. For these substances the parameters of processes are as follows [5,6] : Thermal diffusivities: (15)…”

Section: Numerical Solution Resultsmentioning

confidence: 99%

“…The mathematical model of thermo-chemical processes in the cathode of plasmatron [5], which is being heated by an electric arch, is investigated. The model describes temperature and phase states taking into account kinetic of phase transformation in accordance with a state diagram.…”

Section: Task Descriptionmentioning

confidence: 99%

Computational Model of Phase Transformations in Thermo-Chemical Cathodes Using Kinetic Approach

Kavokin

Kazmi

Munir

2012

KEM

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The paper presents the results of modeling of the processes of phases transformations occurring in cathode of plasmatron with zirconium insertion. Model describes temperature and liquid-solid phase transformation in cathode considering kinetics of transformation in accordance with a state diagram. The comparison between one-dimensional mathematical models was exploited for estimation of the kinetics coefficient. First model is based on well-known heat equation with Stefans condition on the free boundary between liquid and solid phases [. The standard analytical self-similar solution for two-phase case is applied. In the second model, for heat equation instead of Stefans conditions, differential equations of kinetics are used.

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Investigation and development of high-efficient thermochemical cathodes for the arc plasmatrons

Cited by 2 publications

References 0 publications

A theoretical and experimental investigation of copper electrode erosion in electric arc heaters: I. The thermophysical model

A theoretical and experimental investigation of copper electrode erosion in electric arc heaters: I. The thermophysical model

Computational Model of Phase Transformations in Thermo-Chemical Cathodes Using Kinetic Approach

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