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...

Full description

Saved in:
Bibliographic Details
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
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4998795