Drag Force on Bubbles in Bubble Swarms

Ivo Roghair, Martin van Sint Annaland, Hans J.A.M. Kuipers

    Research output: Contribution to conferencePaper

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    Abstract

    Direct Numerical Simulations with a Front Tracking model have been used to study the hydrodynamic behavior of bubble swarms for the air/water system. In this work, we focus on the effect of the presence of neighboring bubbles on the drag as a function of the void fraction, especially at higher void fractions. Mimicking bubble swarms with a relatively small number of bubbles in a periodic domain, the number of bubbles was varied while keeping the overall void fraction constant. We have observed a strong hindered rise effect, while bubbles tend to arrange themselves in horizontal clusters. The observed minimum in the drag coefficient as a function of the number of bubbles at a fixed void fraction was related to the maximum number of bubbles that can coordinate themselves in a horizontal plane.
    The normalized drag coefficient increases for higher void fractions (i.e. hindered rise). Again, significant effects of horizontal bubble clustering on the drag coefficient were found and explained.
    Original languageEnglish
    Number of pages6
    Publication statusPublished - 9 Dec 2010
    Event7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009 - Melbourne, Australia
    Duration: 9 Dec 200911 Dec 2009

    Conference

    Conference7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009
    CountryAustralia
    CityMelbourne
    Period9/12/0911/12/09

    Keywords

    • METIS-263264

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  • Cite this

    Roghair, I., van Sint Annaland, M., & Kuipers, H. J. A. M. (2010). Drag Force on Bubbles in Bubble Swarms. Paper presented at 7th International Conference on Computational Fluid Dynamics in the Minerals and Process Industries 2009, Melbourne, Australia.