Thermal analysis of an arc-heater electrode with a rotating arc foot

Milos, Frank S.; Shepard, C. E.

doi:10.2514/3.604

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Below, we will solve equation ( 21) for the two aforementioned modes: gliding and hopping dynamics. The methodology to be detailed was first developed by Milos et al [58] in the early 90's.…”

Section: Electrodes' Heat Transfer Analytic Model Using Mhd Results A...mentioning

confidence: 99%

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

Gueye¹,

Cressault²,

Rohani³

et al. 2019

J. Phys. D: Appl. Phys.

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This paper focuses on the 3D MHD modeling of an arc plasma at industrial level; the torch is a 'Kvaerner-type' one, made of two concentric graphite electrodes and where spots are displaced with an external magnetic field. Different phenomenologies in arc movement were observed, ranging from a gliding arc on electrodes surfaces to hopping arc foots, agreeing with previous experimental works at atmospheric pressure. These dynamics have non-negligible consequences in the plasma process: the hopping mode induces more erosion due to a higher heat flux at the electrodes surfaces in comparison to the gliding arc; the latter mode results also in a strong gas swirling inside the torch, thus longer particles residence time is predicted.

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Section: Electrodes' Heat Transfer Analytic Model Using Mhd Results A...mentioning

confidence: 99%

MHD modeling of rotating arc under restrike mode in ‘Kvaerner-type’ torch: part I. Dynamics at 1 bar pressure

Gueye¹,

Cressault²,

Rohani³

et al. 2019

J. Phys. D: Appl. Phys.

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Section: Introductionmentioning

confidence: 99%

“…The only papers where the previous history of the heat transfer was taken into account are those by Milos and Shepard [25] and by Teste et al [26]. The authors of [25] were focused on maximum temperature, thus the average temperature was not considered. 1 Their goal was to calculate the maximum temperature within the rotating arc foot (anode attachment) to establish conditions under which this maximum temperature remains below the melting point.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer to a cathode of a rotating arc

Nemchinsky

2015

Plasma Sources Sci. Technol.

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In gas heaters and other plasma devices that use tubular electrodes, the arc is rotated in order to spread the heat load to the electrodes and to reduce their erosion. A method to calculate spatiotemporal temperature development along the surface of these electrodes is suggested. The important feature of the method is that it takes into account the heat prehistory of the electrode: the temperature field created by the previous arc rotations. The result of these calculations shows that the average temperature created by these previous rotations could be very high. In the considered cases, it reaches almost 30% of the peak temperature (the Peclet number Pe = 25) and 50% of the peak temperature at the high arc velocity of rotation (Pe = 250). In particular, the method allows one to predict the number of rotations necessary to reach the steady-state heat transfer. These results clearly demonstrate that calculations that do not take into account the heat transfer history are not capable of providing correct results.

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