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Electrically stimulated aerosol filtration in packed beds
Author(s) -
Harriott G. M.,
Saville D. A.
Publication year - 1980
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690260311
Subject(s) - aerosol , electric field , filtration (mathematics) , charge (physics) , electric charge , particle (ecology) , charged particle , chemistry , electrostatics , surface charge , packed bed , mechanics , chemical physics , analytical chemistry (journal) , ion , chromatography , physics , organic chemistry , statistics , mathematics , oceanography , quantum mechanics , geology
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.