Particle Bounce During Filtration of Particles on Wet and Dry Filters.

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Title Particle Bounce During Filtration of Particles on Wet and Dry Filters.
Author Mullins, Benjamin James; Agranovski, Igor E; Braddock, Roger David
Journal Name Aerosol Science and Technology
Year Published 2003
Place of publication USA
Publisher Taylor and Francis
Abstract This paper experimentally examines the bounce and immediate re-entrainment of liquid and solid monodisperse aerosols under a stable filtration regime (precake formation) by wet and dry fibrous filters. PSL and DEHS were the solid and liquid aerosols, respectively, used in four monodisperse sizes of 0.52, 0.83, 1.50, and 3.00 μm. Three different fibrous filters were used to filter the aerosol streams, and the efficiency of the filtration process for each aerosol type under dry and wet regimes was measured. It was found that the solid particles generally exhibited a lower fractional filtration efficiency than liquid particles, although this difference decreased in the smaller size fractions. The difference between solid and liquid efficiencies was found to be greatest in the 1.5 μm size range. As particle sizes of liquid/solid aerosols and filtration parameters were similar, this difference is most likely to be due to the effect of particle bounce and or immediate re-entrainment occurring inside the filter, with the greater efficiency of filtration of the liquid particles being due to their greater capacity to plastically/elastically deform in order to absorb the impact forces. However, for the wet filtration regime (each fibre of the filter was coated by a film of water), no significant difference in filtration efficiency was detectable between solid and liquid aerosols. Therefore, the conclusion can be drawn that the either the bounce effect of the particles is inhibited by the liquid film, or the filtration conditions in the wet filter are so different that the aerosol properties are less significant with respect to capture.
Peer Reviewed Yes
Published Yes
Alternative URI
Volume 37
Page from 587
Page to 600
ISSN 0278-6826
Date Accessioned 2004-03-22
Date Available 2015-02-03T03:03:20Z
Language en_US
Faculty Faculty of Environmental Sciences
Subject PRE2009-Environmental Engineering
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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