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  • Observation and modelling of barrel droplets on vertical fibres subjected to gravitational and drag forces

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    Author(s)
    Mullins, Benjamin J
    Braddock, Roger D
    Agranovski, Igor E
    Cropp, Roger A
    Griffith University Author(s)
    Braddock, Roger D.
    Cropp, Roger A.
    Agranovski, Igor E.
    Year published
    2006
    Metadata
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    Abstract
    Extensive experimental investigation of the wetting processes of fibre/liquid systems during air filtration (when drag and gravitational forces are acting) has shown many important features, including droplet extension, oscillatory motion, and detachment or flow of drops from fibres as airflow velocity increases. A detailed experimental study of the aforementioned processes was conducted using glass filter fibres and H2O aerosol, which coalesce on the fibre to form barrel droplets with small contact angles. The droplets were predominantly observed in the Reynolds transition (or unsteady laminar) flow region. The droplet ...
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    Extensive experimental investigation of the wetting processes of fibre/liquid systems during air filtration (when drag and gravitational forces are acting) has shown many important features, including droplet extension, oscillatory motion, and detachment or flow of drops from fibres as airflow velocity increases. A detailed experimental study of the aforementioned processes was conducted using glass filter fibres and H2O aerosol, which coalesce on the fibre to form barrel droplets with small contact angles. The droplets were predominantly observed in the Reynolds transition (or unsteady laminar) flow region. The droplet oscillation appears to be induced by the onset of vortexes in the flow field around the droplet as the increasing droplet size increases the Reynolds number. Flow in this region is usually modelled using the classical two-dimensional Karman vortex street, and there exist no 3D equivalents. Therefore to model such oscillation it was necessary to create a new conceptual model to account for the forces both inducing and inhibiting such oscillation. The agreement between the model and experimental results is acceptable for both the radial and transverse oscillations.
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    Journal Title
    Journal of Colloid and Interface Science
    Volume
    300
    Publisher URI
    http://www.elsevier.com/wps/find/journaldescription.cws_home/622861/description#description
    DOI
    https://doi.org/10.1016/j.jcis.2006.02.059
    Copyright Statement
    © 2006 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Physical sciences
    Chemical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/13854
    Collection
    • Journal articles

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