Abstract
The applicability of the collision kinetic model of point sinks, viz., the linearized theory of screening of the electric field produced by a charged dust particle, based on the Vlasov equations for electrons and ions in a nonequilibrium plasma, which are supplemented with collision terms in the Bhatnagar–Gross–Crook form and effective point sinks to dust particle, is analyzed. The criterion for the applicability of the collision kinetic model of point sinks is the smallness of the deviation of the electron and ion number densities near an absorbing spherical body from unperturbed values. The distributions of electron and ion number densities obtained using the collision kinetic model of point sinks and the orbit motion limited approach are compared. It is shown that the latter approach is applicable only in the low-pressure limit, and upon an increase in pressure, the Coulomb asymptotics of the potential, which is proportional to the frequency electron and ion collisions with neutral atoms (molecules), renders the orbit motion limited approach inapplicable for calculating the ion distribution. It is established that the domain of applicability of the collision kinetic model of point sinks is close to the applicability domain of the Debye–Hückel theory.
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This study was supported by the Russian Science Foundation (project no. 16-12-10424).
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Filippov, A.V. Distribution of Electrons and Ions Near an Absorbing Spherical Body in a Nonequilibrium Plasma. J. Exp. Theor. Phys. 132, 148–158 (2021). https://doi.org/10.1134/S1063776121010118
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DOI: https://doi.org/10.1134/S1063776121010118