Kinematics of charged nanometric particles in silent discharges
Kinematics of charged nanometric particles in silent discharges
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DOI：
10.1088/0022-3727/38/4/014
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发表时间：
2005-02-21
影响因子：
3.4
通讯作者：
Borra, JP
中科院分区：
文献类型：
--
作者：
Jidenko, N;Borra, JP
我们在金属电极上使用1毫米平面对平面结构，有或没有介电屏障，来研究在层流中注入可控电迁移率的带电亚微米粒子的交流电沉淀。收集效率是通过测量不同电压下的浓度来计算的。低于空气电离阈值，实验和理论收集效率是一致的。在空气电离阈值以上，电流和收集效率随频率和电压的增加而增加，这些频率和电压与每秒和单位表面积的微放电次数有关。本研究旨在研究由于微放电的发展而引起的表面极化对带电粒子收集的影响。对比了均匀交流场中无微放电的收集理论和微放电时测量的收集效率，证明了微放电引起的表面极化并不能提高收集效率，但无论频率如何，表面离子斥力都能增加电荷，或者改善了60 kHz时的混合。
We use I mm plane to plane configurations, with or without dielectric barriers, on metallic electrodes to investigate the ac electric precipitation of charged submicronic particles of controlled electrical mobility injected in a laminar flow. The collection efficiency is calculated from concentration measurements for different voltages. Below the air ionization threshold, experimental and theoretical collection efficiencies are consistent. Above the air ionization threshold, the current and collection efficiency increase with frequency and voltage related to the number of microdischarges per second and per unit surface area. This study intends to study the influence of surface polarization due to the development of microdischarges on the collection of charged particles. Comparison between the theory of collection in a homogeneous ac field without microdischarge, on the one hand, and measured collection efficiency with microdischarges, on the other hand, proves that surface polarization by microdischarges does not improve the collection efficiency, but enables either an increase of charge by ion repulsion from the surface, whatever the frequency is, or an improved mixing at 60 kHz.