Population Balances of Micron-Sized Aerosols in a Bipolar Ion Environment
Population Balances of Micron-Sized Aerosols in a Bipolar Ion Environment
复制标题
双极离子环境中微米级气溶胶的种群平衡
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Flagan
中科院分区：
文献类型：
--
作者：
X. López;R. Flagan
目前的工作重新检验了稳态电荷分布分析有效所需的假设。首先，放宽了仅 11 个可用于分布的电荷状态的常见近似，以允许 201 个可用于粒子分布的电荷状态。发现这对半径大于 0.5 μm 的分布行为有很大影响。然后，通过计算许多不同离子对生成速率和初始粒子电荷状态作为半径的函数达到稳态所需的时间，重新检查稳态假设本身。在稳态模型中，通常假设离子群与气溶胶完全解耦；这在整个对流层中被证明是错误的。最后，确定精确模拟给定尺寸的粒子群所需的正电荷态和负电荷态的数量。 © 2013 美国气溶胶研究协会
The present work re-examines the assumptions that are required for a steady-state charge distribution analysis to be valid. First, the common approximation that there are only 11 charge states available to the distribution is relaxed to allow for 201 charge states to be available to the particle distribution. This is found to have large repercussions on the behavior of the distribution for radii greater than 0.5 μm. The steady-state assumption itself is then re-examined by calculating the time required to reach steady state for many different ion-pair production rates and initial particle charge states as a function of radius. In the steady-state model, the ion populations are often assumed to decouple completely from the aerosol; this is shown to be false throughout the troposphere. Finally, the number of positive and negative charge states needed to accurately model a particle population of a given size is determined. © 2013 American Association for Aerosol Research