1999
DOI: 10.1063/1.870043
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Structure and dynamics of the wake of bubbles and its relevance for bubble interaction

Abstract: The flow in the wake of single and two interacting air bubbles freely rising in water is studied experimentally using digital-particle-image-velocimetry in combination with high-speed recording. The experiments focus on ellipsoidal bubbles of diameter of about 0.4–0.8 cm which show spiraling, zigzagging, and rocking motion during their rise in water, which was seeded with small tracer particles for flow visualization. Under counterflow conditions in the vertical channel, the bubbles are retained in the center … Show more

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Cited by 228 publications
(120 citation statements)
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“…As the bubble size is increased, one observes a transition to a planar zigzag path [8,23]. A second instability, often preceded by the zigzag, results in a spiraling path [5,8,15,23]. For even larger bubbles, a third type of oscillating path occurs, which has similarities to the zigzag, sometimes called "rocking".…”
mentioning
confidence: 93%
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“…As the bubble size is increased, one observes a transition to a planar zigzag path [8,23]. A second instability, often preceded by the zigzag, results in a spiraling path [5,8,15,23]. For even larger bubbles, a third type of oscillating path occurs, which has similarities to the zigzag, sometimes called "rocking".…”
mentioning
confidence: 93%
“…We do not address this state and emphasize that it is different than the zigzag mentioned above. Unlike the zigzag state that we study, the rocking bubble undergoes dramatic shape oscillations and the frequency of path oscillation is several times higher than the zigzag or spiral [5,15]. Our approach is to use well resolved measurements of three-dimensional bubble trajectories to calculate the hydrodynamic forces on the bubbles.…”
Section: Introductionmentioning
confidence: 99%
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“…These vortices can impact on a heated surface, transporting heated fluid away and allowing cooler fluid from the bulk to replenish it, thus increasing the heat transfer coefficient. In a study by Brucker [3], PIV (Particle Image Velocimetry) was used to obtain the temporal evolution of the flow field in the near wake of single rising bubbles of 5-7 mm diameter in water. The existence of a pair of counter-rotating vortices close to the bubble base was confirmed.…”
Section: Introductionmentioning
confidence: 99%
“…The flow field in the wake of rising bubbles has been studied using particle image velocimetry (Brücker 1999;Lindken and Merzkirch 2000;Fujiwara et al 2004), laser doppler anemometry (Ellingsen and Risso 2001), dye visualization (Lunde and Perkins 1997) and schlieren optics (de Vries et al 2002). While these studies primarily aimed to improve the understanding of the path instabilities, the detailed mechanisms of mass transfer remain largely unclear because the spatio-temporal dynamics in the close vicinity of the bubble, i.e., the boundary layer at the interface, could not be sufficiently resolved.…”
Section: Introductionmentioning
confidence: 99%