Measuring of Mean Plasma Electrical Conductivity in Anode Area of Plasma Torches with an External Anode

0487011 - ÚFP 2018 RIV CZ eng C - Conference Paper (international conference)
Ondáč, Peter - Mašláni, Alan - Hrabovský, Milan
Measuring of Mean Plasma Electrical Conductivity in Anode Area of Plasma Torches with an External Anode.
Proceedings of the 26th Annual Student Conference Week of Doctoral Students 2017 - WDS 2017. Prague: MATFYZPRESS, 2017 - (Šafránková, J.; Pavlů, J.), s. 88-93. ISBN 978-80-7378-356-3.
[WDS´2017 - 26th Annual Student Conference Week of Doctoral Students 2017 /26./. Prague (CZ), 06.06.2017-08.06.2017]
R&D Projects: GA ČR(CZ) GA15-19444S; GA ČR(CZ) GC17-10246J
Institutional support: RVO:61389021
Keywords : DC arc plasma torch * Plasma electrical conductivity * Anode area
OECD category: Fluids and plasma physics (including surface physics)
http://www.mff.cuni.cz/veda/konference/wds/proc/proc-contents.php?year=2017

We developed a non-intrusive direct procedure of measuring an average electrical conductivity of a plasma volume in hot anode areas of those plasma torches. For our measurements, we used a high-speed camera, a high-voltage probe, and a hybrid water–argon plasma torch. The measurements were made for various values of ambient pressure, arc electric current, and argon flow rate. The measured plasma conductivity is in agreement with a model, camera observations and indirectly also with spectroscopy measurements. The procedure provides missing experimental data on the average plasma electrical conductivity and estimates average plasma temperature in the anode areas. The procedure can be theoretically used in every plasma torch where the anode arc attachment movement can be observed during a restrike process

Permanent Link: http://hdl.handle.net/11104/0281709