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    Modelling the Influence of Filter Structure on Efficiency nd Pressure Drop in Knitted Filters

    171873_46907_Modelling the Influence of Filter.pdf (280.3Kb)
    Access Status
    Open access
    Authors
    Mullins, Benjamin
    King, Andrew
    Braddock, R.
    Date
    2011
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Mullins, B.J. and King, A.J.C. and Braddock, R.D. 2011. Modelling the Influence of Filter Structure on Efficiency and Pressure Drop in Knitted Filters, in Chan, F. and Marinova, D. and Anderssen, R.S. (ed), MODSIM2011: 19th International Congress on Modelling and Simulation, Dec 12-16 2011. Perth: Modelling and Simulation Society of Australia and New Zealand.
    Source Title
    MODSIM 2011
    Source Conference
    19th International Congress on Modelling and Simulation
    Additional URLs
    http://www.mssanz.org.au/modsim2011/A7/mullins.pdf
    School
    School of Public Health
    Remarks

    Copyright © 2011 Modelling and Simulation Society of Australia and New Zealand

    URI
    http://hdl.handle.net/20.500.11937/18227
    Collection
    • Curtin Research Publications
    Abstract

    Fibrous filters are used extensively in a range of applications, including process engineering, automotive filtration and for worker (respiratory) protection. These filters are usually a felted, nonwoven structure of randomly arranged fibres. However, a special class of such filters exists - knitted filters. These filters are advantageous for many applications, as their knitted structure imparts significant mechanical strength. The structure of the fibres in such filters can be described by the classical strophoid equation. There has been relatively little study on the pressure drop and efficiency of such filters. This work has developed a geometric model of a knitted metal filter, by applying the strophoid equation. The geometric model thus allows a range of geometries to be generated, based on the strophoid variables, and also fibre/wire diameter, then the knits layered at a given bulk porosity (packing density), to create a geometry of desired properties. The geometric model outputs can then be coupled with a novel computational fluid dynamics (CFD) model for fibrous filtration (developed by the authors). This then allows, the relationship between the aforementioned structural properties and critical filter properties such as particle capture efficiency and pressure drop to be investigated. This work examined the pressure drop and efficiency of a knitted filter geometry at 3 different packing densities. The CFD results were compared to classical single fibre efficiency theory for conventional fibrous filters. The CFD results showed increased capture efficiency and pressure drop compared to fibrous filter theory.

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      This work details the results of a study into the relationship between pressure drop and liquid saturation in mist (or coalescing) filters. Liquid saturation (clogging) in mist filters is of critical importance as it is ...
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