Lagrangian simulation of turbulent particle dispersion in electrostatic precipitators

Lagrangian simulation of turbulent particle dispersion in electrostatic precipitators Industrial design of electrostatic precipitators is based on the transport theory developed by Deutsch (1922), which assumes that transverse turbulent mixing is effective enough to maintain the concentration profile uniform throughout the cross section (i.e., turbulent diffusivity is assumed infinite). To improve understanding of turbulent particle dispersion under the influence of electrostatic forces, a database on particle trajectories was first generated, based on the flow field from a direct numerical simulation of a plate‐plate precipitator (Soldati et al., 1993). The effect of various parameters, such as particle size, charge and particle migration velocity, on dispersion and collection efficiency was investigated. Results show that particle concentration profiles are not uniform due to finite values of “turbulent diffusion” coefficient. The simulations indicate that the early stages of particle collection are controlled by particle migration velocity, while final stages are controlled by turbulence diffusion mechanisms. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aiche Journal Wiley

Lagrangian simulation of turbulent particle dispersion in electrostatic precipitators

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Publisher
Wiley
Copyright
Copyright © 1997 American Institute of Chemical Engineers
ISSN
0001-1541
eISSN
1547-5905
DOI
10.1002/aic.690430604
Publisher site
See Article on Publisher Site

Abstract

Industrial design of electrostatic precipitators is based on the transport theory developed by Deutsch (1922), which assumes that transverse turbulent mixing is effective enough to maintain the concentration profile uniform throughout the cross section (i.e., turbulent diffusivity is assumed infinite). To improve understanding of turbulent particle dispersion under the influence of electrostatic forces, a database on particle trajectories was first generated, based on the flow field from a direct numerical simulation of a plate‐plate precipitator (Soldati et al., 1993). The effect of various parameters, such as particle size, charge and particle migration velocity, on dispersion and collection efficiency was investigated. Results show that particle concentration profiles are not uniform due to finite values of “turbulent diffusion” coefficient. The simulations indicate that the early stages of particle collection are controlled by particle migration velocity, while final stages are controlled by turbulence diffusion mechanisms.

Journal

Aiche JournalWiley

Published: Jun 1, 1997

References

  • Simulation of Particle Dispersion in a Two‐Dimensional Mixing Layer
    Chein, Chein; Chung, Chung
  • A New Correlation for the Aerosol Deposition Rate in Vertical Ducts
    Chen, Chen; McLaughlin, McLaughlin
  • Direct Simulation of Turbulent Particle Transport in Electrostatic Precipitators
    Soldati, Soldati; Andreussi, Andreussi; Banerjee, Banerjee

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