Drag an lift forces on bubbles in a rotating flow

Ernst A. van Nierop, S. Luther, J.J. Bluemink, Jacques Magnaudet, Andrea Prosperetti, Detlef Lohse

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Abstract

The motion of small air bubbles in a horizontal solid-body rotating flow is investigated experimentally. Bubbles with a typical radius of 1mm 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.
Original languageUndefined
Pages (from-to)439-444
Number of pages6
JournalJournal of fluid mechanics
Volume571
DOIs
Publication statusPublished - 2007

Keywords

  • METIS-242500
  • IR-60293

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