Effect of a bidirectional coupling of an LTE arc column to a refractory cathode in atmospheric pressure argonAn appropriate coupling of an arc plasma column in the state of local thermodynamic equilibrium to a refractory
cathode necessarily involves the non-equilibrium boundary layer between them. A model has been developed that
combines a model of an equilibrium direct current arc plasma in atmospheric pressure argon with the assembly of a cathode made of tungsten and the boundary layer. A bidirectional coupling has been realized that allows us to consider a variable voltage drop across the boundary layer for different positions on the cathode. Results are obtained for arc currents between 10 and 150A in the cases of both a unidirectional and a bidirectional coupling. The results Show differences in the distributions of the temperature and the normal current density on the cathode surface, and the radial and axial distribution of the plasma temperature. Comparison with results of a fully non-equilibrium model of the arc plasma and experimental findings from optical emission spectroscopy show a fair agreement for currents, where the deviations from equilibrium in the arc column can be ignored. For arc currents beyond 100 A, the arc attachment on the cathode appears in two forms, which differ from each other in the distributions of the temperature and the normal current density on the cathode surface, whereas the values of the total arc voltage are close to each other.

]]>basic researchelectric arcsthermal plasmaMaterials / Surfaces, Thermal Plasma Technologycd737be9-21c7-4d18-ac32-3552b7c87b062020-06-24T10:22:45+02:002021-09-16T15:16:43+02:00enEMIR, INPEffect of a bidirectional coupling - Fig. 2Current density and its components and voltage drop in the ionization layer calculated for the sake of benchmark against published data.

]]>2020-06-26T19:40:51+02:002021-06-11T12:36:53+02:00text/csvcsv382https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-5Effect of a bidirectional coupling - Fig. 3Net heat flux to the cathode wall, constituents and electron temperature Te calculated for the sake of benchmark against published data.

]]>2020-06-26T19:45:47+02:002021-06-11T12:15:52+02:00text/csvcsv745https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-9Effect of a bidirectional coupling - Fig. 6aTemperatures at a distance from the cathode tip 1 mm for an arc current of 142 A.
Te, Th data from the fully non-equilibrium model
variable U, constant U
OES experiment

]]>2020-06-26T19:21:44+02:002021-06-11T12:15:52+02:00text/csvcsv23914https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-8Effect of a bidirectional coupling - Fig. 6bTemperatures at a distance from the cathode tip 2.5 mm for an arc current of 142 A.
Te, Th data from the fully non-equilibrium model
variable U, constant U
OES experiment

]]>2020-06-26T19:49:19+02:002021-06-11T12:15:52+02:00text/csvcsv29850https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-6Effect of a bidirectional coupling - Fig. 6cTemperatures at a distance from the cathode tip 4 mm for an arc current of 142 A.
Te, Th data from the fully non-equilibrium model
variable U, constant U
OES experiment

]]>2020-06-26T19:53:27+02:002021-06-11T12:15:52+02:00text/csvcsv44534https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-10Effect of a bidirectional coupling - Fig. 7Axial distribution of the temperature an arc current of 142 A.
Te, Th data from the fully non-equilibrium model
variable U, constant U
OES experiment

]]>2020-06-26T19:55:40+02:002021-06-11T12:15:52+02:00text/csvcsv29013https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-7Effect of a bidirectional coupling - Fig. 8aDistribution of the temperature Tw and the normal current density jw along the cathode for an current of 142 A.

]]>2020-06-29T08:59:20+02:002021-06-11T12:15:52+02:00text/csvcsv100655https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-4Effect of a bidirectional coupling - Fig. 8bDustribution of the voltage drop U and the absolute value of the electric potential on the plasma side for an arc current of 142 A.

]]>2020-06-29T09:02:17+02:002021-06-11T12:15:52+02:00text/csvcsv45371https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-0Effect of a bidirectional coupling - Fig. 9Predicted arc voltage Uarc and its components Upl and U as functions of the arc current. Experimental values of the arc voltage.

]]>2020-06-29T09:09:59+02:002021-06-11T12:15:52+02:00text/csvcsv567https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-3Effect of a bidirectional coupling- Fig. 10aThe distribution of the temperature Tw along the cathode for arc currents 100 A and 150 A for the two forms of arc attachment.

]]>2020-06-29T09:12:32+02:002021-06-11T12:15:52+02:00text/csvcsv97257https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-2Effect of a bidirectional coupling - Fig. 10bThe distribution of the normal current density jw along the cathode for arc currents 100 A and 150 A for the two forms of arc attachment.

]]>2020-06-29T09:14:18+02:002021-06-11T12:36:53+02:00text/csvcsv102072https://gitlab.inptdat.de/dataset/effect-bidirectional-coupling-lte-arc-column-refractory-cathode-atmospheric-pressure-argon-1DKANhttps://gitlab.inptdat.de