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How hypergravity impacts electric arcs

Date:
December 18, 2013
Source:
Springer Science+Business Media
Summary:
A new study on electric discharge behavior under intense gravitational forces shows that its dynamic changes as gravity increases. Arc discharges are common in everyday conditions like welding or in lightning storms. But in altered gravity, not as much is known about the behavior of electric discharges.
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A new study on electric discharge behaviour under intense gravitational forces shows that its dynamic changes as gravity increases.

Arc discharges are common in everyday conditions like welding or in lightning storms. But in altered gravity, not as much is known about the behaviour of electric discharges. For the first time, Jiří Šperka from Masaryk University, Czech Republic, and his Dutch colleagues studied the behaviour of a special type of arc discharge, so-called glide arc, in varying hypergravity conditions, up to 18 G. In a paper just published in The European Physical Journal D, they demonstrate how the plasma channel of this glide arc discharge moves due to external forces of buoyancy in varying gravity conditions. These results could have implications for improved safety precautions in manned space flights, and in the design of ion thrusters used for spacecraft propulsion.

Though electric discharges can be affected by gravity, the electromagnetic forces between charged particles are typically much stronger than any gravitational forces. Therefore, in order to understand this effect, the authors designed an experimental device to perform measurements on atmospheric pressure glide arc helium plasma under the forces of hypergravity.

They changed the buoyancy force acting on the plasma channel of the glide arc while maintaining a constantly low external gas flow. To do so they relied on the Large Diameter Centrifuge at the European Space Agency's European space research and technology centre (ESTEC) facility in Noordwijk, the Netherlands.

They found that gravity strongly influences the glide arc discharge. These effects stem from thermal buoyancy, which increases with gravity. As such, increasing the centrifugal acceleration of gravity makes the glide arc movement substantially faster. Whereas at 1 G the discharge was stationary, at 6 G it glides with 7 Hz frequency and at 18 G that number rises to 11 Hz. The authors thus established a simple model for the glide arc movement assuming low gas flow velocities, which they validated with experimental results.


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The above post is reprinted from materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. Jiří Šperka, Pavel Souček, Jack J. W. A. Loon, Alan Dowson, Christian Schwarz, Jutta Krause, Gerrit Kroesen, Vít Kudrle. Hypergravity effects on glide arc plasma. The European Physical Journal D, 2013; 67 (12) DOI: 10.1140/epjd/e2013-40408-7

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Springer Science+Business Media. "How hypergravity impacts electric arcs." ScienceDaily. ScienceDaily, 18 December 2013. <www.sciencedaily.com/releases/2013/12/131218095849.htm>.
Springer Science+Business Media. (2013, December 18). How hypergravity impacts electric arcs. ScienceDaily. Retrieved August 3, 2015 from www.sciencedaily.com/releases/2013/12/131218095849.htm
Springer Science+Business Media. "How hypergravity impacts electric arcs." ScienceDaily. www.sciencedaily.com/releases/2013/12/131218095849.htm (accessed August 3, 2015).

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