Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study on the Characteristics of Direct Photoelectric Charging

직접 광대전의 대전특성에 관한 실험적 연구

  • 이창선 (한국과학기술원 대학원 기계공학과) ;
  • 김용진 (한국기계연구원 열유체시스템연구부) ;
  • 김상수 (한국과학기술원 기계공학과)
  • Published : 2000.06.01
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Abstract

Photoelectric charging is a very efficient way of charging small particles. This method can be applied to combustion measurement, electrostatic precipitator, metal separation and control of micro-contamination. To understand the photoelectric charging mechanism, particle charging of silver by exposure to ultraviolet is investigated in this study. Average charges and charge distributions are measured at various conditions, using two differential mobility analyzers, a condensation nucleus counter, and an aerosol electrometer. The silver particles are generated in a spark discharge aerosol generator. After that process, the generated particles are charged in the photoelectric charger using low-pressure mercury lamp that emits ultraviolet having wavelength 253.7 nm. The results show that ultra-fine particles are highly charged by the photoelectric charging. The average charges linearly increase with increasing particle size and the charge distribution change with particle size. These results are discussed by comparison with previous experiments and proposed equations. It is assumed that the coefficient of electron emission probability is affected by initial charge. The results also show that the charge distribution of a particle is dependent on initial charge. Single changed particle, uncharged particle and neutralized particle are compared. The differences of charge distribution in each case increase with increasing particle size.

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References

  1. Burtcher, H., 1992, 'Measurement and Characteristics of Combustion Aerosols with Special Consideration of Photoelectric Charging and Charging by Flame Ions,' J. Aerosol Science, Vol. 23, pp. 549-595 https://doi.org/10.1016/0021-8502(92)90026-R
  2. Matter, D., Mohr, M., Fendel, W, Schmit-Ott, A., and Burtscher, H., 1995, 'Multiple Wavelength Aerosol Photoemission by Eximer Lamps,' J. Aerosol Science, Vol. 26, No.7, pp. 1101-1115 https://doi.org/10.1016/0021-8502(95)00040-J
  3. Burtcher, H., Scherrer, L., Siegmann, H. C., SchmitOtt, A. and Federer, B., 1982, 'Probing Aerosols by Photoelectric Charging.', J. Appl. Phys., 53(5), May https://doi.org/10.1063/1.331120
  4. Jung, Th., Burtcher, H. and Schmit-Ott, A., 1988, 'Multiple Charging of Ultrafine Aerosol Particles by Aerosol Photoemission (APE),' J. Aerosol Science, Vol. 19, No.4, pp. 485-490 https://doi.org/10.1016/0021-8502(88)90023-7
  5. Bucholski, A. and Niessner, R., 1991, 'Indirect Photoelectric Diffusion Charging of Submicron Aerosols,' J. Aerosol Sci., Vol. 22, No. 1, pp. 111-115 https://doi.org/10.1016/0021-8502(91)90097-2
  6. Mohr, M., Kwetkus, B. A. and Burtcher, H., 1993, 'Improvement of Electrostatic Precipitation by UV-Charging of Submiron Particles,' J. Aerosol Science, Vol. 24, Suppl. 1, pp. S247-S248 https://doi.org/10.1016/0021-8502(93)90216-V
  7. Fendel, W and Schmit-Ott, A., 1994, 'Chemical Characterization of Nano Particles via Multiple Photoelectric Charging, ' J. Aerosol Science, Vol. 25, Suppl. 1, pp. S531-S532
  8. Schwyn, S., Garwin, E. and Schmidt-ott, A., 1988, 'Aerosol Generation by Spark Discharge,' J. Aerosol Science, Vol. 19, No.5, pp. 639-642. https://doi.org/10.1016/0021-8502(88)90215-7
  9. Makela, J. M., Aalto, P., Gorbunov, B. Z. and Korhonen, P., 1992, 'Size Distributions from Aerosol Spark Generator,' J. Aerosol Science, Vol. 23, Suppl. 1, pp. S233-S236 https://doi.org/10.1016/0021-8502(92)90392-9
  10. Helsper, C., Molter, W, Lomer, F., Wadenpohl, C. and Kaufmann, S., 1993, 'Investigations of a New Aerosol Generator for the Production of Carbon Aggregate Particles,' Atmospheric Environment, Vol. 27A, No.8, pp. 1271-1275
  11. 안강호,1997.'정전 섬유필터 주위의 입자포집 및 거동에 관한 수치해석적 연구,' 대한기계학회논문집(B).제21권,제11호,pp.1509-1517