Contribution to the assessment of the power balance at the electrodes of an electric arc in air

Testé, Philippe; Leblanc, Thierry; Rossignol, Jérôme; Andlauer, Richard

doi:10.1088/0963-0252/17/3/035001

Cited by 15 publications

(4 citation statements)

References 24 publications

(38 reference statements)

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“…The concept of volt equivalent of the heat ‡ux to electrode is a popular tool for approximate analysis of plasma-electrode interaction in high-pressure arc discharges; e.g., [20] and references therein and [21] as a more recent example. This concept is based on the assumption that the power input Q from the plasma to the electrode is proportional to the arc current I:…”

Section: Volt Equivalent Of the Heat ‡Ux To The Anodes Of Highpressurmentioning

confidence: 99%

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Almeida¹,

Cunha²,

Benilov³

2017

J. Phys. D: Appl. Phys.

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Numerical modelling of near-anode layers in arc discharges in several gases (Ar, Xe, and Hg) is performed in a wide range of current densities, anode surface temperatures, and plasma pressures. It is shown that the density of energy ‡ux to the anode is only weakly a¤ected by the anode surface temperature and varies linearly with the current density. This allows one to interpret the results in terms of anode heating voltage (volt equivalent of the heat ‡ux to the anode). The computed data may be useful in di¤erent ways. An example considered in this work concerns the evaluation of thermal regime of anodes in the shape of a thin rod operating in the di¤use mode. Invoking the model of nonlinear surface heating for cathodes, one obtains a simple and free of empirical parameters model of thin rod electrodes applicable to dc and ac high-pressure arcs provided that no anode spots are present. The model is applied to a variety of experiments reported in the literature and a good agreement with the experimental data found.

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Section: Volt Equivalent Of the Heat ‡Ux To The Anodes Of Highpressurmentioning

confidence: 99%

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Almeida¹,

Cunha²,

Benilov³

2017

J. Phys. D: Appl. Phys.

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“…Another popular tool for approximate analysis of plasmaelectrode interaction in high-pressure arc discharges is the concept of volt equivalent of the heat flux to electrode, e.g. [88] and references therein and [89] as a more recent example. This concept is based on the assumption that the density of the energy flux from the plasma to the electrode is proportional to the local current density:…”

Section: Anode Heating Voltagementioning

confidence: 99%

Modeling the physics of interaction of high-pressure arcs with their electrodes: advances and challenges

Benilov

2019

J. Phys. D: Appl. Phys.

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Incorporation of realistic models of plasma-electrode interaction remains a bottleneck in the development of predictive models of devices with high-pressure arcs. The most important aspects of the underlying physics have already been understood, so no fundamentally new physical mechanisms have been described in the recent publications (which are many); the aim was rather to develop practicable numerical models that adequately describe known mechanisms. Unfortunately, no universally accepted numerical models have emerged: the developed models are in many cases incompatible with each other and it is not easy to identify the place of each model in the global picture. The aim of this contribution is to summarize physically justified descriptions of the interaction of high-pressure arcs with their electrodes and to survey from this point of view the recent works, thus bringing them into a kind of system as possible. The relevant aspects of the conventional LTE arc models are discussed. Outstanding challenges for future work are identified.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…However, analysis of the pictures presented in Teste et al[26] shows that the average temperature increases as the number of rotations increases.…”

mentioning

confidence: 97%

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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Contribution to the assessment of the power balance at the electrodes of an electric arc in air

Cited by 15 publications

References 24 publications

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Computing anode heating voltage in high-pressure arc discharges and modelling rod electrodes in dc and ac regimes

Modeling the physics of interaction of high-pressure arcs with their electrodes: advances and challenges

Heat transfer to a cathode of a rotating arc

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