Attraction mechanism of like-charged aerosol particles in a moving conductive medium

We analyze the structure of the space electric charge that appears in the vicinity of a charged dust particle in a moving conductive medium. We show that when the conduction currents play a major role, the screening space charge is concentrated in the form of a thin wake behind the dust particle, wh...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2005-07, Vol.101 (1), p.177-185
Main Authors: Gaponov-Grekhov, A. V., Iudin, D. I., Trakhtengerts, V. Yu
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AEROSOLS
CHARGED-PARTICLE TRANSPORT
COULOMB FIELD
DIPOLES
DUSTS
ELECTRIC CHARGES
PARTICLES
PERMITTIVITY
PLASMA
PLASMA INSTABILITY
PLASMA PRESSURE
POLARIZATION
PRESSURE RANGE MILLI PA
SPACE CHARGE
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Summary:We analyze the structure of the space electric charge that appears in the vicinity of a charged dust particle in a moving conductive medium. We show that when the conduction currents play a major role, the screening space charge is concentrated in the form of a thin wake behind the dust particle, while the total Coulomb field forms a dipole structure and serves as an attractive center for other particles with charges of the same sign. We consider the pairing conditions for such particles. Including the polarization contribution from the dust component to the permittivity radically changes the field structure when the dust particle concentration approaches the dissipative instability threshold. In this case, the zone of attraction of like-charged dust particles expands sharply. Estimates suggest that the effects under consideration can govern the formation of regular structures in a moving dusty plasma at fairly high pressures, P > 0.1-1 mbar.
ISSN:1063-7761
1090-6509
DOI:10.1134/1.2010674