0025840 - ÚFP 2006 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Chumak, Oleksiy - Hrabovský, Milan - Kavka, Tetyana - Kopecký, Vladimír
Investigation of diffuse current in arc boundary by electric probes.
[Difuzní proud v hraniční oblasti oblouku měřený elektrickými sondami.]
WDS´ 05Proceedings of contributed papers. Praha: MATFYZPress Praha, 2005 - (Šafranková, J.), s. 343-346. part 2. ISBN 80-86732-59-2.
[Annual Conference of Doctoral Students WDS 05/14th./. Praha (CZ), 07.06.2005-10.06.2005]
Výzkumný záměr: CEZ:AV0Z20430508
Klíčová slova: Anode attachment * arc boundary * diffuse current
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

Electric probes were used for investigation of an intermediate layer between the arc and anode surface in regions outside the main current channel. Distributions of a diffuse current and the potential were measured. Resistance and heating of the intermediate layer by diffuse current were evaluated. It was found that not only the value of diffuse current strongly depends on distance from the arc but also the shape of the distribution and the position of the maximum of the current change with the distance. These trends can be explained by expanding of the plasma jet. Evaluated equivalent intermediate layer resistance shows widening of the conductive region in a stream wise direction. Variation of resistivity of the intermediate layer is much higher than variation of the potential drop on the layer. That means that distributed current as well as Joule heating of the layer are generally controlled by distributed resistance.

Vlastnosti přechodové vrstvy mezi hranicí elektrického oblouku a povrchem anody byly zjišťovány elektrickými sondami. Bylo změřeno rozložení difuzního proudu a potenciálu a vyhodnoceno rozložení odporu v přechodové vrstvě. Ukazuje se, že rozložení proudu a Jouleův ohřev vrstvy jsou dány rozložením odporu.
Trvalý link: http://hdl.handle.net/11104/0116177