標題: Electrostatic charge measurement and charge neutralization of fine aerosol particles during the generation process
作者: Tsai, CJ
Lin, JS
Deshpande, CG
Liu, LC
環境工程研究所
Institute of Environmental Engineering
關鍵字: aerosol charge analyzer;charge equilibrium;charge neutralizer;condensation aerosols;electrostatic charge;evaporation aerosols
公開日期: 1-四月-2006
摘要: An aerosol charge analyzer has been constructed to measure the charge distribution of NaCl particles generated in the laboratory. A radioactive electrostatic charge neutralizer utilizing Po-210 was used to neutralize the electrostatic charge of the particles. The atomization technique was used to generate NaCl particles with diameters of 0.2 to 0.8 mu m, while the evaporation and condensation method was adopted to generate particles of 0.01 to 0.2 mu m in diameter. The experimental data demonstrates that the absolute average particle charge depends on the particle diameter, and is higher than that calculated by the Boltzmann charge equilibrium for particles within the range of 0.2 to 0.8 mu m. The charge increases with decreasing NaCl concentration. When these particles are neutralized using the Po-210 neutralizer, it is found that the electrostatic charge reaches the Boltzmann charge equilibrium. For 0.01. to 0.2 mu m NaCl particles generated using the evaporation and condensation method, test results show that the absolute average particle charge is higher than that calculated by the Boltzmann charge equilibrium for particles larger than 0.03 to 0.05 mu m in diameter, while it is lower than that predicted by the Fuchs theory [1], for particles smaller than 0.03 to 0.05 mu m. However, after charge neutralization, particles with diameter above 0.05 mu m reach the Boltzmann charge equilibrium condition, and the charges for particles with diameters of 0.010 to 0.05 mu m, agree well with Fuchs' theory.
URI: http://dx.doi.org/10.1002/ppsc.200500961
http://hdl.handle.net/11536/12430
ISSN: 0934-0866
DOI: 10.1002/ppsc.200500961
期刊: PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
Volume: 22
Issue: 5
起始頁: 293
結束頁: 298
顯示於類別:期刊論文


文件中的檔案:

  1. 000237398400001.pdf