Browsing by Author "PROSPERETTI, ANDREA"

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    Drag and lift forces on bubbles in a rotating flow
    (2007)
    VAN NIEROP, ERNST A.
    ;
    Luther, Stefan  
    ;
    BLUEMINK, JOHANNA J.
    ;
    MAGNAUDET, JACQUES
    ;
    PROSPERETTI, ANDREA
    ;
    Lohse, Detlef  
    The motion of small air bubbles in a horizontal solid-body rotating flow is investigated experimentally. Bubbles with a typical radius of 1 mm are released in a liquid-filled horizontally rotating cylinder. We measure the transient motion of the bubbles in solid-body rotation and their final equilibrium position from which we compute drag and lift coefficients for a wide range of dimensionless shear rates 0.1< Sr <2 ( Sr is the velocity difference over one bubble diameter divided by the slip velocity of the bubble) and Reynolds numbers 0.01< Re <500 ( Re is based on the slip velocity and bubble diameter). For large Sr , we find that the drag force is increased by the shear rate. The lift force shows strong dependence on viscous effects. In particular, for Re <5, we measure negative lift forces, in line with theoretical predictions.