尘埃等离子体鞘层的玻姆判据  

The Bohm criterion for the dusty plasma sheath

作　　者：王正汹[1] 刘金远[1] 邹秀[1] 刘悦[1] 王晓钢[1] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室,大连116024

出　　处：《物理学报》2004年第3期793-797,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 175 0 13 );国际合作基金 (批准号 :10 0 10 760 80 7和 10 160 42 0 799)资助的课题~~

摘　　要：采用流体方程和自洽电荷变化模型研究了尘埃等离子体鞘层的玻姆判据 .讨论了离子临界马赫数和尘埃粒子临界马赫数随尘埃密度变化的关系 ,以及尘埃表面势随尘埃密度变化的趋势 .由于鞘边尘埃粒子的存在 ,离子必需以大于声速的速度进入鞘层 ;随尘埃密度的持续增加 ,离子的临界马赫数增加到一个最大值后开始逐渐减小 .The hydrodynamic-fluid model and the self-consistent dust charging model are used to investigate the Bohm criterion for the dusty plasma sheath. The variation of the ion critical Mach number and the dust Mach number with dust density are presented, and the relation between the dust surface potential and the dust density at the sheath edge is discussed. It is shown that the ion velocity entering the sheath would exceed the ion sound velocity due to the existence of dust particles. The ion critical Mach number began declining after a maximum with the incessant increase of the dust density. The numerical results satisfy the qualitative analysis of the Sagdeev potential.

关 键 词：尘埃等离子体 鞘层 玻姆判据 流体方程 自洽电荷变化模型 离子临界马赫数 尘埃密度 

分 类 号：O531[理学—等离子体物理]