Charge distributions of aerosol dioctyl sebacate particles charged in a dielectric barrier discharger

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作者：
Byeon, Jeong Hoon [1 ]
Ji, Jun Ho [2 ]
Park, Jae Hong [1 ]
Yoon, Ki Young [1 ]
Hwang, Jungho [1 ]
机构：
[1] Department of Mechanical Engineering, Yonsei University, Seoul, 120-749, Korea, Republic of
[2] Division of Digital Appliance Network, Samsung Electronics Co., Ltd., Suwon, 442-742, Korea, Republic of
来源：
Journal of Aerosol Science | 2008年 / 39卷 / 05期
关键词：
The collection efficiencies of submicron aerosol particles using a two-stage; dielectric barrier discharge (DBD) type electrostatic precipitator have been reported previously [Byeon et al. (2006). Collection of submicron particles by an electrostatic precipitator using a dielectric barrier discharge. Journal of Aerosol Science; 37; 1618-1628]. In this paper; the charge distributions of aerosol dioctyl sebacate (DOS) particles; which had a mobility equivalent diameter of 118; 175; and 241 nm and were charged in a DBD charger; were examined using a tandem differential mobility analyzer (TDMA) system at applied voltages of 9-11 kV and frequencies of 60-120 Hz. The mean number of elementary charges for positively or negatively charged particles increased slightly with increasing applied voltage or frequency. However; the number of elementary charges increased significantly with increasing particle size. At any applied voltage and frequency; the charge distributions of these particles of these sizes indicated asymmetric bipolar charging. The positive-to-negative charge ratios were 10.4; 4.7; and 3.0 for particle sizes of 118; and; 241; nm; respectively; at a DBD voltage and frequency was 9 kV and 60 Hz; respectively. Fluorometric analysis showed that average positive-to-negative charge ratios were 11.5; 4.9; and 3.7 for particle sizes of 118; which agrees well with the TDMA results. Further fluorometric analyses with larger particles (514 and 710 nm) and higher frequencies (1 and 2 kHz) showed that the positive-to-negative charge ratio reached almost unity with increasing particle size or frequency. © 2007 Elsevier Ltd. All rights reserved;
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