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The path of a circular air bubble rising in a viscous fluid of a Hele-Shaw cell is found to change from a straight path to a zigzag path when the Reynolds number of the bubble (proportional to the bubble terminal velocity) exceeds a threshold. By visualizing the wake structures of the rising bubbles, and measuring the actual paths of the bubbles, we demonstrate that the path instability is a consequence of the vortex shedding behind the bubble.
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Kelley et al. (1997) studied this question.
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