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    Bubbles in viscous liquids: Time dependent behaviour and wake characteristics

    239734.pdf (967.6Kb)
    Access Status
    Open access
    Authors
    Gumulya, M.
    Joshi, J.
    Utikar, R.
    Evans, G.
    Pareek, Vishnu
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gumulya, M. and Joshi, J. and Utikar, R. and Evans, G. and Pareek, V. 2016. Bubbles in viscous liquids: Time dependent behaviour and wake characteristics. Chemical Engineering Science. 144: pp. 298-309.
    Source Title
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2016.01.051
    ISSN
    0009-2509
    School
    School of Chemical and Petroleum Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP140104510
    URI
    http://hdl.handle.net/20.500.11937/42830
    Collection
    • Curtin Research Publications
    Abstract

    The dynamics of a bubble, initially stationary and spherical, rising in a viscous Newtonian liquid have been studied numerically using 3-D Volume-of-Fluid (VOF) method implemented in the Gerris flow solver. The study encompasses 8.7≤Eo (=ΔρgD2/σΔρgD2/σ)≤641 and Re≤151. Additionally, results published in the literature encompassing bubbles with lower values of Eo numbers were also considered, such that the overall dependencies of bubble shape, wake characteristics, and drag coefficient over a large range of Eo and Re values can be identified. While it was found that the deformation of the bubbles as predicted through the numerical study can generally replicate experimental observations presented, several limitations were identified, such as in the representation of skirt formation behind a skirted bubble and the formation of satellite bubbles behind a bubble rising at high Reynolds numbers. The dependency of the bubble aspect ratio on the Weber and Morton numbers was confirmed for cases of spherical and ellipsoidal bubbles; whilst for spherical cap and skirted bubbles the aspect ratio was found to depend largely on the Reynolds and Capillary numbers, respectively. Finally, the expansion and formation of closed/open laminar wakes behind the rising bubble were analysed and was found to correlate well with the bubble Re and Eo numbers.

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