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Title: Numerical investigation into the loading behaviour of filters operating in the diffusional and interception deposition regimes
Authors: Dunnett, Sarah J.
Clement, Charles F.
Keywords: Fibrous filter
Numerical model
Issue Date: 2012
Publisher: © Elsevier
Citation: DUNNETT, S.J. and CLEMENT, C.F., 2012. Numerical investigation into the loading behaviour of filters operating in the diffusional and interception deposition regimes. Journal of Aerosol Science, 53, pp. 85 - 99.
Abstract: Using a previously developed theory, which allows for changes in gas flow from deposit growth, calculations are performed for deposition on an initially cylindrical fibre. The deposit is given a specified porosity through which the flow is calculated from Darcy's equation using the Beavers and Joseph (1967) boundary condition at the outer boundary. Results are obtained for different porosities φ the volume fraction of space in the deposit, for flow conditions such that deposition occurs by the mechanisms of diffusion and interception, but not impaction (Stk<1). Dependencies given in the literature of the deposit permeability on φ are examined. The dominant mechanism is determined by the value of the parameter, s=R/δ where R is particle to fibre radius ratio and δ is the non-dimensional thickness of the flow diffusion layer. Where diffusion dominates, s<1, increase in porosity does not significantly increase deposition, apart from the effect of its lower density. Where s>1 and interception dominates, deposition increases with increase in φ and is significant for φ ≥0.9 where more streamlines pass through the deposit. The shape of the deposit remains peaked at the front of the fibre, at the forward stagnation point, but, if a deposit has an initial flat front, it grows into a shape peaked away from the stagnation point, as observed by Kanaoka et al. (1986). Possible reasons for this behaviour are discussed.
Description: This article was published in the Journal of Aerosol Science [© Elsevier] and the definitive version is available at: http://dx.doi.org/10.1016/j.jaerosci.2012.06.008
Version: Accepted for publication
DOI: 10.1016/j.jaerosci.2012.06.008
URI: https://dspace.lboro.ac.uk/2134/11179
Publisher Link: http://dx.doi.org/10.1016/j.jaerosci.2012.06.008
ISSN: 0021-8502
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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