Electrically stimulated aerosol filtration in packed beds

Authors

  • G. M. Harriott,

    1. Textile Research Institute and, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540
    Current affiliation:
    1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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  • D. A. Saville

    1. Textile Research Institute and, Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08540
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Abstract

Since charged particles are quite mobile in an electric field, charge is often added to aerosol particles to facilitate capture; indeed, provision for such charging is an indispensable part of electrostatic precipitators. Nevertheless, calculations disclose that a very slight amount of charge may suffice when the distance the aerosol particle must travel to the collector surface is small, contrary to the usual situation. In the experiments described, here, a model aerosol containing 0.5 μm polystyrene particles passed through a radioactive charge neutralizer to deliberately reduce the charge as much as practicable and then through a packed bed under the influence of a fairly large external electric field. Filtration efficiencies approaching 100% were obtained owing to the influence of the field on small amounts of residual charge.

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