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Non-linear Shape Oscillations of Rising Drops and Bubbles: Experiments and Simulations.

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    0453424 - ÚCHP 2016 RIV US eng J - Journal Article
    Lalanne, B. - Abi Chebel, N. - Vejražka, Jiří - Tanguy, S. - Masbernat, O. - Risso, F.
    Non-linear Shape Oscillations of Rising Drops and Bubbles: Experiments and Simulations.
    Physics of Fluids. Roč. 27, č. 12 (2015), s. 123305. ISSN 1070-6631. E-ISSN 1089-7666.
    [Conference of European Colloid and Interface Society /27./. Sofia, 01.09.2013-06.09.2013]
    R&D Projects: GA MŠk(CZ) LD13018
    Institutional support: RVO:67985858
    Keywords : shape oscillations * nonlinearitites * interface dynamics
    Subject RIV: CI - Industrial Chemistry, Chemical Engineering
    Impact factor: 2.017, year: 2015

    This paper focuses on shape-oscillations of a gas bubble or a liquid drop rising in another liquid. The bubble/drop is initially attached to a capillary and is released by a sudden motion of that capillary, resulting in the rise of the bubble/drop along with the oscillations of its shape. Such experimental conditions make difficult the interpretation of the oscillation dynamics with regard to the standard linear theory of oscillation because amplitude of deformation is large enough to induce nonlinearities, the rising motion may be coupled with the oscillation dynamics, and clean conditions without residual surfactants may not be achieved. These differences with the theory are addressed by comparing experimental observation with numerical simulation. Simulations are carried out using Level-Set and Ghost-Fluid methods with clean interfaces. The effect of the rising motion is investigated by performing simulations under different gravity conditions.
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