The impact of diffusion on confined oscillated bubbly fluid

Details The impact of diffusion on confined oscillated bubbly fluid The impact of diffusion on confined oscillated bubbly fluid

2008-11-25

arxiv.org/abs/0811.4189v1

Physics

Fluid Dynamics

12 pages, 9 figures, submitted to Phys. Fluids

Scientific paper

We consider the dynamics of monodisperse bubbly fluid confined by two plane solid walls and subjected to small-amplitude high-frequency transversal oscillations. The frequency these oscillations is assumed to be high in comparison with typical relaxation times for a single bubble, but comparable with the eigenfrequency of volume oscillations. A time-averaged description accounting for mutual coupling of the phases and the diffusivity of bubbles is applied. We find nonuniform steady states with the liquid quiescent on average. At relatively low frequencies accumulation of bubbles either at the walls or in planes oriented parallel to the walls is detected. These one-dimensional states are shown to be unstable. At relatively high frequencies the bubbles accumulate at the central plane and the solution is stable.

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