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Measurement of Anode Arc Attachment Movement in DC Arc Plasma Torch at Atmospheric Pressure
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SYSNO ASEP 0489830 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement of Anode Arc Attachment Movement in DC Arc Plasma Torch at Atmospheric Pressure Author(s) Ondáč, Peter (UFP-V)
Mašláni, Alan (UFP-V) RID
Hrabovský, Milan (UFP-V) RID
Jeništa, Jiří (UFP-V) RID, ORCIDSource Title Plasma Chemistry and Plasma Processing. - : Springer - ISSN 0272-4324
Roč. 38, č. 3 (2018), s. 637-654Number of pages 18 s. Publication form Print - P Language eng - English Country US - United States Keywords DC arc plasma torch ; Arc attachment movement ; Anode area ; Anode erosion ; High-speed camera Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA15-19444S GA ČR - Czech Science Foundation (CSF) GC17-10246J GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000429484500011 EID SCOPUS 85044398768 DOI 10.1007/s11090-018-9888-0 Annotation Direct current (DC) arc plasma torches are widely used in various industrial applications. Studying processes in their anode area helps to extend their lifetime, and stabilize the plasma flow for plasma applications. This paper reports detailed observations of the fast movement (above 100 m/s) of the anode arc attachment in a hybrid water-argon DC arc plasma torch with an external anode. We measured a mean electrical conductivity of a plasma volume above the anode and found a relation between the attachment movement and the anode erosion. Further, we measured average attachment speed, the average period of the restrike process and the average distances travelled by the attachment under different experimental conditions such as different values of the arc electric current, argon flow rate and different anode configurations. For our measurements, we used a high-speed camera and a high-voltage probe. Our results are in agreement with a model of plasma generated by a hybrid plasma torch and with spectroscopy measurements. The results describe the movement of the anode arc attachment in detail and provide experimental data on average plasma electrical conductivity in hot anode areas. Both the measurements of the mean electrical conductivity and the procedure for quantitative comparisons of anode erosion can be used also in water plasma torches and theoretically also in gas plasma torches. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019
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