The Nonequilibrium Character of the Aerosol Charge Distributions Produced by Neutralizes
The Nonequilibrium Character of the Aerosol Charge Distributions Produced by Neutralizes
复制标题
中和作用产生的气溶胶电荷分布的非平衡特性
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
G. M. Frick
中科院分区：
文献类型：
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作者：
W. Hoppel;G. M. Frick
研究了控制电离区域下游极性离子浓度的机制，结果表明，正负离子浓度的比值不是恒定的。由于离子向壁和气溶胶颗粒的不均匀扩散引起的离子浓度的不平衡在离子比中被放大，因为离子复合迅速地同等地耗尽两种极性的离子。因此，气溶胶电荷分布不是平衡的，而是响应于变化的离子环境而演变的。所得出的结论是支持的数值模拟和测量的离子浓度和比率的带负电荷的粒子下游的电离区域。几个现有的中和器进行了评估和原型电离器产生的气溶胶与近对称的平衡电荷分布进行了讨论。
The mechanisms that control the polar ion concentrations downstream of an ionized region are examined and it is shown that the ratio of positive to negative ion concentrations is not constant. The imbalance in the ionic concentrations caused by unequal diffusion of ions to the walls and to aerosol particles is magnified in the ion ratio as ionic recombination rapidly depletes ions of both polarities equally. Consequently, the aerosol charge distribution is not in equilibrium but is evolving in response to the changing ion environment. The conclusions drawn are supported by numerical modeling and by measurements of ionic concentrations and ratios of negatively to positively charged particles downstream of the ionized region. Several existing neutralizers are evaluated and a prototype ionizer which produces an aerosol with a nearly symmetric equilibrium charge distribution is discussed.