Charging of a conducting sphere moving in a weakly ionized gas under
an arbitrarily oriented external uniform electric field |
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Authors: | A E Sorokin |
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Institution: | (1) Institute of Applied Physics RAS, Ulianova str. 46, 603950 Nizhny Novgorod, Russia |
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Abstract: | A charging conducting sphere moving in a weakly ionized gas
is investigated. An external uniform electric field is applied with arbitrary orientation
relative to the gas flow.
The ion current is obtained analytically and investigated numerically
in ballistic assumption.
It is shown that charging regimes depend not only on the net charge of the sphere but
also on the gas flow type,
and the parameter ξ± – the ratio of ion drift velocity far from the sphere to the
gas velocity. The cases |ξ±|<1 and |ξ±|>1 yield two different charging regimes
for Stokes and potential flows. For the potential flow, the ion current has
been found analytically in continuous ξ±-parameter space.
The stationary charge of an isolated sphere is also calculated numerically as a function of
α. It achieves maximum magnitudes
in direct (α=0) and back (α=π) flows respectively. |
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Keywords: | 92 60 Mt Particles and aerosols 94 20 wl Plasma interactions with dust and aerosols |
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