ION AEROSOL ATTACHMENT COEFFICIENTS AND THE STEADY-STATE CHARGE-DISTRIBUTION ON AEROSOLS IN A BIPOLAR ION ENVIRONMENT
ION AEROSOL ATTACHMENT COEFFICIENTS AND THE STEADY-STATE CHARGE-DISTRIBUTION ON AEROSOLS IN A BIPOLAR ION ENVIRONMENT
复制标题
DOI：
10.1080/02786828608959073
复制
发表时间：
1986-01-01
影响因子：
5.2
通讯作者：
FRICK, GM
中科院分区：
文献类型：
--
作者：
HOPPEL, WA;FRICK, GM
本文对Fuchs理论（本文作了修正）和三体俘获理论进行了离子-气溶胶附着系数的计算。对于半径大于0.007 μm的粒子，所得的电荷分布相当一致。对于更小的粒子，三体捕获变得越来越重要。在半径小于0.02 μm处，理论预测的电荷分布与最近测量的电荷分布的比较显示出良好的一致性。由于正离子和负离子的物理性质的差异而引起的不对称充电可导致带正电和带负电的粒子的数量的大差异，特别是在较大半径处。不对称的电荷分布也示出依赖于电离率。对于气溶胶浓度与离子浓度相当的情况，多分散性对电荷分布的影响难以预测。它示出，一个占主导地位的大小的颗粒可以建立一个正的负离子比，反过来，将确定在其他尺寸的电荷分布，不同于将存在的情况下的主导物种。
Calculations of the ion—aerosol attachment coefficients are carried out for Fuchs' theory (as corrected in this paper) and for a theory which includes three body trapping. The resulting charge distributions agree quite well for particles with radii greater than about 0.007 μm. For smaller particles three-body trapping becomes increasingly important. Comparison of theoretically predicted charge distributions with recently measured charge distributions at radii smaller than 0.02 μm show good agreement. Asymmetric charging due to differences in the physical properties of positive and negative ions can result in large differences in the number of positively and negatively charged particles, particularly at larger radii. The asymmetric charge distribution is also shown to depend on the ionization rate. For the case when aerosol concentrations are comparable to the ion concentrations the effect of polydispersity on the charge distribution is difficult to predict. It is shown that a dominant size particle can establish a positive to negative ion ratio which, in turn, will determine a charge distribution at other sizes, different from that which would exist in the absence of the dominant species.