Sectional modeling of nanoparticle size and charge distributions in dusty plasmas
Sectional modeling of nanoparticle size and charge distributions in dusty plasmas
复制标题
尘埃等离子体中纳米颗粒尺寸和电荷分布的截面建模
DOI：
10.1088/0963-0252/21/5/055023
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发表时间：
2012
影响因子：
3.8
通讯作者：
S. Girshick
中科院分区：
文献类型：
--
作者：
P. Agarwal;S. Girshick
气溶胶种群动态的截面模型在气溶胶文献中得到了很好的建立，但在尘埃等离子体的数值模型中得到的关注相对较少，大多数建模研究都假设存在单分散尘埃粒子。在纳米颗粒成核和生长的等离子体的情况下，颗粒尺寸分布中可能存在显著的多分散性，并且随机充电可能导致给定尺寸的颗粒具有宽的电荷状态分布。截面模型虽然计算量大，但非常适合处理这种分布。本文介绍了一个概述的截面建模的纳米尘埃等离子体，并提出了模拟结果的例子，揭示了重要的定性特征的时空演变等离子体，其中许多不能透露的模型，只考虑单分散尘埃颗粒和平均粒子电荷。这些功能包括双峰粒子群的出现，包括非常小的中性粒子和较大的负电荷粒子，凝聚，扩散和结构的粒子云的大小和电荷分布的影响，以及尘埃等离子体余辉的动力学。
Sectional models of the dynamics of aerosol populations are well established in the aerosol literature but have received relatively less attention in numerical models of dusty plasmas, where most modeling studies have assumed the existence of monodisperse dust particles. In the case of plasmas in which nanoparticles nucleate and grow, significant polydispersity can exist in particle size distributions, and stochastic charging can cause particles of given size to have a broad distribution of charge states. Sectional models, while computationally expensive, are well suited to treating such distributions. This paper presents an overview of sectional modeling of nanodusty plasmas, and presents examples of simulation results that reveal important qualitative features of the spatiotemporal evolution of such plasmas, many of which could not be revealed by models that consider only monodisperse dust particles and average particle charge. These features include the emergence of bimodal particle populations consisting of very small neutral particles and larger negatively charged particles, the effects of size and charge distributions on coagulation, spreading and structure of the particle cloud, and the dynamics of dusty plasma afterglows.