Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
권호 표지
DOI QR코드

DOI QR Code

Numerical Investigation of Collection Efficiency of Virtual Impactor with Electro-Aerodynamic Lens

전기-공기역학적 렌즈를 이용한 가상임팩터 포집효율에 관한 수치적 연구

  • Received : 2019.06.18
  • Accepted : 2019.07.01
  • Published : 2019.07.31
Download PDF
⟨ Previous Next ⟩

Abstract

An electro-aerodynamic lens for improving the performance of virtual impactor has been proposed in this study. ANSYS FLUENT Release 16.1 was used for numerical analysis of virtual impactor with and without the electro-aerodynamic lens, used to collimate the incoming aerosol particles into a particle beam before injecting the particles into the virtual impactor. Particles supplied to the electro-aerodynamic lens were assumed to be highly charged. By using an aerodynamic lens before the virtual impactor, without any electrostatic effect, it was found that the cut-off diameter of the virtual impactor was reduced from $4.2{\mu}m$ to $0.68{\mu}m$ and that the fine particle contamination problem became more serious. However, by employing the combined electrostatic and aerodynamic effects, that is, by applying electric voltage potential to the electro-aerodynamic lens, the cut-off diameter was found to be further reduced to $0.45{\mu}m$ and the fine particle contamination was eliminated.

Keywords

References

  1. Hounam, R. F., Sherwood, R. J., "The Cascade Centripeter: A Device for Determining the Concentration and Size Distribution of Aerosols," American Industrial Hygiene Association Journal, Vol. 26, pp. 122-131, 1965. https://doi.org/10.1080/00028896509342711
  2. Conner, W. D., "An Inertial-Type Particle Separator for Collecting Large Samples," Journal of the Air Pollution Control Association, Vol. 16, pp. 35-38, 1966. https://doi.org/10.1080/00022470.1966.10468438
  3. Dzubay, T. G., Stevens, R. K., "Ambient Air Analysis with Dichotomous Sampler and X-ray Fluorescence Spectrometer," Environmental Science and Technology, Vol. 9, pp. 663-668, 1975. https://doi.org/10.1021/es60105a011
  4. Forney, L. J., "Aerosol Fractionator for Large- Scale Sampling," Review of Scientific Instruments, Vol. 47, pp. 1264-1269, 1976. https://doi.org/10.1063/1.1134504
  5. Marple, V. A., Chien, C. M., "Virtual Impactors: A Theoretical Study," Environmental Science and Technology, Vol. 14, pp. 976-985, 1980. https://doi.org/10.1021/es60168a019
  6. Wada, M., Tsukada, M., Namiki, N., Szymanski, W. W., Noda, N., Makino, H., Kanaoka, C., Kamiya, H., "A Two-Stage Virtual Impactor for In-Stack Sampling of PM2.5 and PM10 in Flue Gas of Stationary Sources," Aerosol and Air Quality Research, Vol. 16, pp. 36-45, 2016. https://doi.org/10.4209/aaqr.2015.06.0383
  7. Chen, B. T., Yeh, H. C., "An Improved Virtual Impactor: Design and Performance," Journal of Aerosol Science, Vol. 18, pp. 203-214, 1987. https://doi.org/10.1016/0021-8502(87)90056-5
  8. Loo, B. W., Cork, C. P., "Development of High Efficiency Virtual Impactors," Aerosol Science and Technology, Vol. 9, pp. 167-176, 1988. https://doi.org/10.1080/02786828808959205
  9. Chein, H., Lundgren, D. A., "A Virtual Impactor with Clean Air Core for the Generation of Aerosols with Narrow Size Distributions," Aerosol Science and Technology, Vol. 18, pp. 376-388, 1993. https://doi.org/10.1080/02786829308959611
  10. Ding, Y., Koutrakis, P., "Development of a Dichotomous Slit Nozzle Virtual Impactor," Journal of Aerosol Science, Vol. 31, pp. 1421-1431, 2000. https://doi.org/10.1016/S0021-8502(00)00048-3
  11. Lee, H., Jo, D. H., Kim, W. G., Yook, S. J., Ahn, K. H., "Effect of an Orifice on Collection Efficiency and Wall Loss of a Slit Virtual Impactor," Aerosol Science and Technology, Vol. 48, pp. 121-127, 2014. https://doi.org/10.1080/02786826.2013.862333
  12. Heo, J. E., Zahir, M. Z., Park, H., Seo, J., Park, H., Yook, S. J., "Effect of Horizontal Inlet on Slit-Nozzle Virtual Impactor Performance," Journal of Mechanical Science and Technology, Vol. 32, pp. 2419-2424, 2018. https://doi.org/10.1007/s12206-018-0454-8
  13. Choi, Y., Kim, S., "An Improved Method for Charging Submicron and Nano Particles with Uniform Charging Performance," Aerosol Science and Technology, Vol. 41, pp. 259-265, 2007. https://doi.org/10.1080/02786820601148262