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Force measurements on rising bubbles

Published online by Cambridge University Press:  15 November 2006

WOODROW L. SHEW
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, 69007 Lyon, France
SEBASTIEN PONCET
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, 69007 Lyon, FrancePresent address: Laboratoire de Modélisation et Simulation Numérique en Mécanique et Génie des Procédés, Technople de Chateau-Gombert, 38 rue F. Joliot Curie, 13451 Marseille, France.
JEAN-FRANÇOIS PINTON
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, 69007 Lyon, France
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Abstract

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The dynamics of millimetre-sized air bubbles rising through still water are investigated using ultrasound velocimetry combined with high-speed video. From measurements of speed and three-dimensional trajectories we calculate time-resolved precise drag and lift forces on the bubble, which give rise to planar zigzag and three-dimensional spiralling motion. Temporal correlations of forces and the oscillatory bubble motions, particularly the lift force, emphasize the importance of the wake vortices found in previous studies.

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Type
Papers
Copyright
© 2006 Cambridge University Press