標題: Study of a Nanoparticle Charger Containing Multiple Discharging Wires in a Tube
作者: Tsai, C. J.
Chen, S. C.
Chen, H. L.
Chein, H. M.
Wu, C. H.
Chen, T. M.
環境工程研究所
Institute of Environmental Engineering
關鍵字: Charging efficiency;nanoparticles;unipolar charger
公開日期: 2008
摘要: A unipolar charger containing multiple discharging wires in a tube (inner diameter: 50mm) was developed and tested in order to increase the aerosol flow rate and the charging efficiency of nanoparticles. Four gold wires of 25 mm in diameter and 15 mm in length were used as the discharging electrodes to generate positive ions (Ni) from 2.72 x 10(8) ions/cc to 3.87 x 10(9) ions/cc in concentration at the discharging voltage of + 4.0 similar to + 10 KV. Monodisperse NaCl particles of 10 similar to 50nm in diameter were used to test the charging efficiency and the particle loss of charged particles with different aerosol flow rates, corona voltages and sheath flow rates. The sheath air near the tube wall was found to increase the extrinsic charging efficiency, and the highest efficiency was obtained at + 6.0KV discharging voltage, 10 L/min aerosol flow rate and 9 L/min sheath flow rate. The extrinsic charging efficiency increased from 10.6% to 74.2% when the particle diameter was increased from 10 to 50 nm. The TDMA (tandem differential mobility analyzer) method was used to determine the charge distribution and the mean charge per particle and it was found that the Fuchs charging theory corrected for the extrinsic charging efficiency matched with the experimental data very well.
URI: http://hdl.handle.net/11536/9833
http://dx.doi.org/10.1080/01496390802219034
ISSN: 0149-6395
DOI: 10.1080/01496390802219034
期刊: SEPARATION SCIENCE AND TECHNOLOGY
Volume: 43
Issue: 13
起始頁: 3476
結束頁: 3493
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