尘埃等离子体凝聚模型
等离子体物理
2009-11-10 v2
摘要
通过考虑围绕尘埃颗粒测试粒子的球形屏蔽层，构建了尘埃等离子体凝聚的模型。距离测试粒子小于一个碰撞平均自由程的无碰撞区域被证明可分为三个同心层，每层具有不同的物理特性。在这些层之间的界面处采用了匹配渐近展开法，并提供了确定界面半径的方程。尽管尘埃德拜长度远小于维格纳-赛茨半径，但发现它在物理上是重要的，因为它给出了在第二层和第三层之间界面处屏蔽静电势急剧截止的尺度长度。当该截止半径与维格纳-赛茨半径之比超过1时，预测会发生凝聚，并且该预测与实验吻合良好。
引用
@article{arxiv.physics/0403119,
title = {A model for the condensation of a dusty plasma},
author = {P. M. Bellan},
journal= {arXiv preprint arXiv:physics/0403119},
year = {2009}
}
备注
29 pages, 4 figures, 1 table, to appear in Physics of Plasmas. Manuscript revised on May 1, 2004 to take into account accuracy of Mie scattering dust grain diameter measurement method used in Hayashi/Tachibana experiment. Model now compared to Hayashi/Tachibana experiment using measured rather than fitted dust grain diameter and using higher estimate for Te/Ti (two new references added; revisions made to two paragraphs in Sec. VII, to bottom plot of Fig. 3, and to right-most column of Table 1)