Abstract
In this paper, computational fluid dynamics was used to study the dynamics of a single and multiple bubbles in quiescent liquids using the volume of fluid method. The effect of liquid viscosity, bubbles size and initial bubbles configuration on the bubbles dynamics and interactions was investigated. It is found that the bubble rising trajectory changes from rectilinear to zigzag trajectory as liquid viscosity decreases. The different behaviors of bubbles introduce various liquid flow structures. For three bubbles rising side by side, the magnitude of bubble shape oscillations increases compared to the case of a single bubble. This is due to the fluctuations in liquid phase velocity fields which were induced by the liquid flow around the two neighboring bubbles. However, for two in-line bubbles with different sizes, the larger bubble always has a strong effect on the smaller one for each initial configuration.
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