Electrostatic mechanisms of aerosol collection by granular filters: A review

Michael Shapiro*, Chaim Gutfinger, Gabriel Laufer

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

10 Scopus citations

Abstract

The paper reviews the state of the art of aerosol filtration by granular filters in the presence of electrostatic forces. Firstly, six types of electrostatic interactions are described, together with the respective means of electrostatic enhancement, namely electric charging of aerosol particles, charging of filter granules and application of an external electrostatic field to the filter bed. Solution methods for calculating the efficiency of diffusionally, inertially and electrostatically governed aerosol deposition processes are presented. Existing flow field and electrostatic force models within the filter bed and their merits in accounting for bed void fraction, when calculating aerosol collection rates, are described. Known theoretical results are generalized and conveniently presented in the form of tables for each specific electrostatic interaction. Experimental data on the role of electrostatic forces in aerosol filtration are given. Several industrial applications of electrostatically enhanced granular filters are described. The advantages and the limitations of the existing aerosol filtration models are emphasized by means of a comparison between theoretical and experimental results.

Original languageEnglish
Pages (from-to)651-677
Number of pages27
JournalJournal of Aerosol Science
Volume19
Issue number6
DOIs
StatePublished - Dec 1988
Externally publishedYes

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