On the reliability of the Bhatnagar–Gross–Krook collision model in weakly ionized plasmas
On the reliability of the Bhatnagar–Gross–Krook collision model in weakly ionized plasmas
复制标题
弱电离等离子体中 Bhatnagar-Gross-Krook 碰撞模型的可靠性
DOI：
10.1063/1.3152329
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
S. Vladimirov
中科院分区：
文献类型：
--
作者：
D. Else;R. Kompaneets;S. Vladimirov
在假设电荷交换是离子散射的主要机制的前提下，数值研究了电场驱动下具有迁移率限制离子流的弱电离等离子体中离子的速度分布。使用现实的恒定平均自由程模型进行计算，并与恒定平均自由时间（Bhatnagar-Gross-Krook）模型给出的结果进行比较。比较表明，在流速度小于或相当于中性粒子热速度的区域，两种模型产生的速度分布非常相似。然而，即使在这一制度中，也存在着对某些情况可能很重要的数量差异。尘埃等离子体的理论研究的影响进行了讨论。
The ion velocity distribution in weakly ionized plasma with mobility-limited ion flow driven by an electric field is studied numerically, with the assumption that the charge exchange is the dominant mechanism of ion scattering. The calculations are performed using the realistic constant mean free path model and the results are compared with those given by the constant mean free time (Bhatnagar–Gross–Krook) model. The comparison shows that in the regime where the flow velocity is less than or comparable with the thermal velocity of neutrals the two models yield quite similar velocity distributions. Nevertheless, even in this regime, there are quantitative differences that might be important for certain cases. The implications for theoretical investigations in dusty plasmas are discussed.
DOI：
--
发表时间：
2009
期刊：
Physics of Plasmas 16
影响因子：
--
作者：
Y. Nakamura;O. Ishihara
通讯作者：
O. Ishihara