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    Interaction of bubbles rising inline in quiescent liquid

    Access Status
    Fulltext not available
    Authors
    Gumulya, Monica
    Utikar, Ranjeet
    Evans, G.
    Joshi, J.
    Pareek, V.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Gumulya, M. and Utikar, R. and Evans, G. and Joshi, J. and Pareek, V. 2017. Interaction of bubbles rising inline in quiescent liquid. Chemical Engineering Science. 166: pp. 1-10.
    Source Title
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2017.03.013
    ISSN
    0009-2509
    School
    Department of Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP140104510
    URI
    http://hdl.handle.net/20.500.11937/52824
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier LtdIn the buoyant rise of two bubbles arranged in an inline configuration, the trailing bubble tends to accelerate beyond its terminal velocity, due to its interaction with the wake of the preceding bubble. It is demonstrated that several different interactive behaviours could be obtained due to this acceleration. Firstly, at low values of Reynolds numbers (Re=?lVtD/µ?35), the inline configuration was found to be stable, and the two bubbles would collide and coalesce due to the velocity difference between the two. Secondly, at higher Re values (Re > 50), vorticity development around the trailing bubble causes it to deviate away from the inline configuration, thus preventing the occurrence of a head-on collision between the two bubbles. The deviation of the bubble was found occur if a certain critical velocity is exceeded by the trailing bubble. The value of the critical velocity was found to decrease with increasing Re values. Further, an increase in Eotvos number (Eo=?lgD2/s) tends to increase the critical velocity, indicating that enhanced bubble deformability actually improves the path stability of the trailing bubble. The interaction of bubbles can therefore significantly influence the tendency of the bubbles to collide and coalesce.

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