Transport of Charged Particles in Gas Streams

  • C. P. Wu
  • M. K. Mazumder


This paper presents a brief description of electrodynamic screens and their applications for: (1) minimizing deposition of charged particles inside sampling tubes and (2) transporting charged particles away from nonconducting substrates for shielding and removal of contaminants. Ring electrodes attached to the inner wall of a sampling tube were used to produce a radial confinement force on the charged particles when an ac field was applied. Effects of varying the applied voltage and the frequency of the ac field are discussed. The higher the voltage, the stronger the confinement force on the charged particles, but the upper limit of the voltage is set by the breakdown of the dielectric medium between the rings. The distribution of the electrical field was calculated using a single-phase electrodynamic field, and the motion of particles inside the tube was computed using a theoretical model. Experiments were performed to design an optimal configuration of the electrodynamic screen. A computer model of the electrodynamic sampling tube for several ring-type electrodes with different wire and ring diameters, and for different spacings between rings, has been developed. Experimental data are compared with the values predicted from the model. Applications of the electrodynamic screen for sampling and measuring charge-to-mass ratio distributions of particles are discussed.


Charged Particle Sampling Tube Image Force Faraday Cage Flat Screen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    D. S. Ensor, A. C. Clayton, T. Yamamoto, and R. P. Donovan, Particle deposition velocity studies in silicon technology, in “Particles in Gases and Liquids I: Detection, Characterization and Control,” K. L. Mittal, editor, p. 195, Plenum Press, New York (1989).CrossRefGoogle Scholar
  2. 2.
    M. K. Mazumder, R. E. Ware, T. Yokoyama, B. Rubin, and D. Kamp, Measurement of particle size and electrostatic charge distributions on toners using E-SPART analyzers, IEEE ISA Conf. Proceedings 87CH2499-2, p. 1606 (1987).Google Scholar
  3. 3.
    S. Masuda, Electric curtain for confinement and transport of charged aerosol particles, Proceedings of the Albany Conference on Electrostatics (1971).Google Scholar
  4. 4.
    S. Masuda, K. Fujibayashi, K. Ishida, and H. Inaba, Confinement and transportation of charged aerosol clouds via electric curtain, Electrical Eng. in Japan, 92(1) 43 (1972).CrossRefGoogle Scholar
  5. 5.
    S. Masuda and Y. Matsumoto, Theoretical characteristics of standing-wave electric curtains, Electrical Eng. in Japan, 93(1) 71 (1973).CrossRefGoogle Scholar
  6. 6.
    J. R. Mel cher, E. P. Warren, and R. H. Kotwal, Traveling-wave delivery of single component developer, IEEE ISA Conf. Proceedings 87CH2499-2, 1585 (1987).Google Scholar
  7. 7.
    H. Singer, H. Steinbigler, and P. Weiss, A charge simulation method for the calculation of high voltage fields, IEEE PAS 93 1660 (1974).Google Scholar
  8. 8.
    B. J. Savilonis and J. S. Lee, Particle deposition in a charged aerosol flowing through a conducting tube, J. Fluids Eng., 109, 449 (December 1978).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • C. P. Wu
    • 1
  • M. K. Mazumder
    • 1
  1. 1.Dept. of Electronics and InstrumentationUniversity of Arkansas at Little RockLittle RockUSA

Personalised recommendations