Thermal Plasmas and Non-Thermal Arcs
9:00 am – 10:30 am,
Tuesday October 14 Session FT1 COEX, Room E4
Modelling and experimental studies of microarcs at low currents
9:00 am – 9:30 amPresenter: Margarita Baeva (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany)
Authors: Jonas Ballentin (Institute for Electrical Power Engineering, University of Rostock, Rostock, Germany), Ralf Methling (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany), Aleksandar Jovanovic (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany), Dirk Uhrlandt (Leibniz Institute for Plasma Science and Technology, Greifswald, Germany), Dominik Bratek (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany), Niklas Schüler (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany), Carsten Uber (Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany)
Glow and arc discharges are the most prominent direct current discharges and are found in a wide range of applications – light sources, surface treatment and material processing, nanoparticle synthesis. Arc plasmas of small size are providing alternatives to electron and laser beams. Microarcs, which are less than 1mm in size in at least one direction, are of growing interest in additive manufacturing and microwelding, repair of damaged surfaces of high value components as examples. Furthermore, microarcs are undesirably generated during contact opening in low-voltage switching devices. They can occur as contact discharges in devices used in explosive environment as well.
The studies of direct current microarcs and their characterization are important for the reasons of applications and the gain of fundamental understanding. Experiments on microarcs that can reveal their structure and properties are very scarce and challenging due to the small size. High-speed imaging allows one to reveal their temporal behaviour and measure the arc length. The spatial resolution and the reproducibility can be difficult due to instabilities. Modelling works can significantly contribute to the characterization of the direct current microarcs as the spatial resolution of these small-size objects is enabled in recent years by powerful computers and numerical tools. Such works allow us to explore the microarcs and facilitate their applications.
The present contribution will present recent modelling and experimental studies of microarcs related to microwelding arrangements, test apparatus for explosion protection, and switching devices. The studies include a self-consistent non-equilibrium modelling, electrical and spectroscopic measurements, and a high-speed imaging. The understanding of the underlying physical processes occurring in the microarcs under consideration and the characterization of the microarcs plasma were the main objectives of these studies.
Funding acknowledgement
The work is funded by the German Research Foundation (DFG) Project numbers 524731006 and 411446115.
PRESENTATIONS (5)
- 9:00 am – 9:30 amModelling and experimental studies of microarcs at low currents
Margarita Baeva (presenter), Jonas K Ballentin, Ralf Methling, Aleksandar Jovanovic, Dirk Uhrlandt, Dominik Bratek, Niklas Schüler, Carsten Uber
- 9:30 am – 9:45 amModelling of ignition of high-current arc discharges on cold cathodes in high-pressure argon: Comparison of different computational approaches
Mikhail Benilov (presenter), Diego F Santos, Ivan Stepanov, Mário Cunha
- 9:45 am – 10:00 amInteraction between arc root redistribution, melt pool dynamics, and contact erosion in DC Switches
Yubin He (presenter), Chao Zhang, Wanbin Ren
- 10:00 am – 10:15 amOn the necessary condition for the generation of atmospheric-pressure electrodeless microwave plasma
Gihyun Kim (presenter), Woorin Kang, Moon Soo Bak
- 10:15 am – 10:30 amDynamics of Long Electrical Arcs in Crossflow: An Imaging Study
Fayleon Lin (presenter), Vincent Andraud, Rafael Sousa Martins, Joan Montanya, Guillem Tobella, Carmen Guerra-Garcia