Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Ultrafine Particle Collection Using an Electret Fiber with a Dipole Charge Distribution

쌍극자전하분포를 가진 정전섬유를 이용한 대전된 초미립자의 집진

  • Lee Myong-Hwa (Environmental Engineering Science Program, Washington University) ;
  • Otani Yoshio (Department of Chemistry and Chemical Engineering, Kanazawa University) ;
  • Kim Jong-Ho (Department of Environment Engineering, Hanseo University) ;
  • Kim Shin-Do (Faculty of Environmental Engineering, University of Seoul)
  • Published : 2005.04.01
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Abstract

An electret fiber with a dipole charge distribution was used to capture charged ultrafine particles in this study. Brownian diffusion and Coulombic force are the dominant collection mechanisms in the electret filtration of charged ultrafine particles. The interaction between Brownian diffusion and Coulombic force for the deposition of ultrafine particles onto a dipolarly charged fiber is studied by solving the convective diffusion equation including Coulombic force as an external force, and the numerical results are compared with the experimental data. As a result, it is shown that there is a negative interaction between Brownian diffusion and Coulombic force, i.e., Coulombic capture efficiency is reduced with decreasing Pe. These results suggest that Brownian diffusion and Coulombic capture efficiency, $\eta$$_{CD}$ is not a simple sum of Brownian diffusion efficiency, $\eta$$_{D}$ and Coulombic capture efficiency, $\eta$$_{C}$.

Keywords

References

  1. Brown, R.C. (1981) Capture on Dust Particles in Filters by Line-Dipole Charged Fibres, J. Aerosol Sci., 12, 349-356 https://doi.org/10.1016/0021-8502(81)90024-0
  2. Brown, R.C. (1993) Air Filtration : An Integrated Approach to the Theory and Applications of Fibrous Filters, Pergamon Press, Oxford, England
  3. Chen, C.C., M. Lehimaki, and K. Willeke (1993) Loading and Filtration Characteristics of Filtering Facepieces, Am. Ind. Hyg. Assoc. J., 54, 51-60 https://doi.org/10.1080/15298669391354324
  4. Fuchs, N.A. and I.B. Stechkina (1963) A Note on the Theory of Fibrous Aerosol Filters, Ann. Occup. Hyg., 6, 27-30
  5. Kanaoka, C., H. Emi, Y. Otani, and T. Iiyama (1987) Effect of Charging State of Particles on Electret Filtration, Aerosol Sci. Technol., 7, 1-13 https://doi.org/10.1080/02786828708959142
  6. Kirsch, A.A. and N.A. Fuchs (1968) Studies on Fibrous Aerosol Filters-III Diffusional Deposition of Aerosols in Fibrous Filters, Ann. Occup. Hyg., 11, 299-304 https://doi.org/10.1093/annhyg/11.4.299
  7. Lee, M.-H., Y. Otani, N. Namiki, and H. Emi (2002) Prediction of Collection Efficiency of High-Performance Electret Filters, Journal of Chemical Engineering of Japan, 35, 1, 57-62 https://doi.org/10.1252/jcej.35.57
  8. Nifuku, M., Y. Zhou, A. Kisiel, T. Kobayashi, and H. Katoh (2001) Charging characteristics for electret filter materials, Journal of Electrostatics, 51-52, 200-205
  9. Otani, Y., H. Emi, and J. Mori (1993) Initial Collection Efficiency of Electret Filter and Its Durability for Solid and Liquid Particles, KONA Powder and Particle, 11, 207-214 https://doi.org/10.14356/kona.1993023
  10. Pich, J., H. Emi, and C. Kanaoka (1987) Coulombic Deposition Mechanism in Electret Filters, J. Aerosol Sci., 18 (1), 29-35 https://doi.org/10.1016/0021-8502(87)90006-1
  11. Siag, A.M., K.B. Tennal, and M.K. Mazumder(1994) Determination of Fiber Charge Density of Electret Filters, Particulate Science and Technology, 12, 351-365 https://doi.org/10.1080/02726359408906661
  12. Stechkina, I.B. and N.A. Fuchs (1966) Studies on Fibrous Aerosol Filters-I Calculation of Diffusional Deposition of Aerosols in Fibrous Filters, Ann. Occup. Hyg., 9, 59-64r https://doi.org/10.1093/annhyg/9.2.59
  13. Tsai, P.P., G. Qin, and C. Hassenboehler(2000) Comparison of Electrostatic Charging at Different Locations in the Melt Blowing Process, INJ Fall 2000, 8-14ion