Dust-void formation in a dc glow discharge

被引:31
作者
Fedoseev, A. V. [1 ]
Sukhinin, G. I. [1 ,2 ]
Dosbolayev, M. K. [3 ]
Ramazanov, T. S. [3 ]
机构
[1] Russian Acad Sci, Inst Thermophys, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, Novosibirsk 630090, Russia
[3] Al Farabi Kazakh Natl Univ, IETP, Alma Ata 050040, Kazakhstan
来源
PHYSICAL REVIEW E | 2015年 / 92卷 / 02期
关键词
ION DRAG FORCE; POSITIVE-COLUMN; MICROGRAVITY CONDITIONS; CRYSTALLINE-STRUCTURES; COMPLEX PLASMAS; FLUID MODEL; PARTICLES; PARAMETERS; TRANSPORT; VORTICES;
D O I
10.1103/PhysRevE.92.023106
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Experimental investigations of dusty plasma parameters of a dc glow discharge were performed in a vertically oriented discharge tube. Under certain conditions, dust-free regions (voids) were formed in the center of the dust particle clouds that levitated in the strong electric field of a stratified positive column. A model for radial distribution of dusty plasma parameters of a dc glow discharge in inert gases was developed. The behavior of void formation was investigated for different discharge conditions (type of gas, discharge pressure, and discharge current) and dust particle parameters (particle radii and particle total number). It was shown that it is the ion drag force radial component that leads to the formation of voids. Both experimental and calculated results show that the higher the discharge current the wider dust-free region (void). The calculations also show that more pronounced voids are formed for dust particles with larger radii and under lower gas pressures.
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页数:9
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