Negative drag force on finite-size charged dust grain in strongly collisional plasma

The drag force on finite-size charged conductive spherical dust grain stationary moving in strongly collisional weakly ionized plasmas is studied numerically within the drift-diffusion approximation. It is assumed that the grain surface collects all encountered electrons and ions, i.e., the grain is...

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Published in:Physics of plasmas 2017-10, Vol.24 (10)
Main Author: Momot, A. I.
Format: Article
Language:English
Subjects:
Charging
Collisional plasmas
Drag
Dust
Mathematical analysis
Plasma density
Plasma physics
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description The drag force on finite-size charged conductive spherical dust grain stationary moving in strongly collisional weakly ionized plasmas is studied numerically within the drift-diffusion approximation. It is assumed that the grain surface collects all encountered electrons and ions, i.e., the grain is at a floating potential. The velocity dependencies of the drag, stationary charging current and grain charge are obtained for various grain sizes for both isothermal and nonisothermal plasmas. The plasma density profiles were calculated and compared with those obtained earlier in a kinetic approach. The numerical results of the drag force are compared with known analytical expressions. A more simple expression is proposed, and its applicability is examined. Natural drag described by the Stokes' force is taken into consideration.
doi_str_mv 10.1063/1.4998795
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subjects Charging
Collisional plasmas
Drag
Dust
Mathematical analysis
Plasma density
Plasma physics
title Negative drag force on finite-size charged dust grain in strongly collisional plasma
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