Influence of Particle Shape on Filtration Processes

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Title Influence of Particle Shape on Filtration Processes
Author Boskovic, Lucija; Altman, Igor; Agranovski, Igor E; Braddock, Roger David; Myojo, Toshihiko; Choi, Mansoo
Year Published 2005
Place of publication United States
Abstract The influence of particle shape on filtration processes was investigated. Two types of particles, including spherical polystyrene latex (PSL) and iron oxide, and perfect cubes of magnesium oxide, were examined. It was found that the removal efficiency of spherical particles on fibrous filters is very similar for corresponding sizes within the range of 50-300 nm, regardless of the fact that the densities of PSL and iron oxide differ by a factor of five. On the other hand, the removal efficiency of magnesium oxide cubic particles was measured, and found to be much lower than the removal efficiency for the aerodynamically similar spheres. Such disparity was ascribed to the different nature of the motion of the spherical and cubic particles along the fiber surface, following the initial collision. After touching the fiber surface and before coming to rest, the spherical particles could either slide or roll compared to the cubic ones, which could either slide or tumble. During tumbling, the area of contact between the particle and the fiber changes significantly, thus affecting the bounce probability, whilst for the spheres, the area of contact remains the same for any point of the particle trajectory. The extra probability of particle bounce by the cubes was derived from the experimental data. The particle kinetic energy was proposed to be responsible for the difference in removal efficiency of particles with alternative shapes, if all other process parameters remain the same. The increase in kinetic energy is shown to favor the increase of the bounce probability.
Peer Reviewed Yes
Published Yes
Alternative URI
Volume 39
Page from 1184
Page to 1190
ISSN 0278-6826
Date Accessioned 2006-03-01
Date Available 2015-02-03T03:04:02Z
Language en_US
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Environmental Technologies
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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