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Drag and lift forces on bubbles in a rotating flow

Published online by Cambridge University Press:  04 January 2007

ERNST A. VAN NIEROP ,
STEFAN LUTHER ,
JOHANNA J. BLUEMINK ,
JACQUES MAGNAUDET ,
ANDREA PROSPERETTI  and
DETLEF LOHSE
ERNST A. VAN NIEROP
Affiliation:
Faculty of Applied Sciences, Physics of Fluids, University of Twente, The Netherlands Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
STEFAN LUTHER
Affiliation:
Faculty of Applied Sciences, Physics of Fluids, University of Twente, The Netherlands
JOHANNA J. BLUEMINK
Affiliation:
Faculty of Applied Sciences, Physics of Fluids, University of Twente, The Netherlands
JACQUES MAGNAUDET
Affiliation:
Institut de Mécanique des Fluides de Toulouse, (IMFT), Allée du Professeur Camille Soula, 31400 Toulouse, France
ANDREA PROSPERETTI
Affiliation:
Faculty of Applied Sciences, Physics of Fluids, University of Twente, The Netherlands Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
DETLEF LOHSE
Affiliation:
Faculty of Applied Sciences, Physics of Fluids, University of Twente, The Netherlands
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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 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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 571 , 25 January 2007 , pp. 439 - 454
Copyright
Copyright © Cambridge University Press 2007

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