How gravity and size affect the acceleration statistics of bubbles in turbulence

Details How gravity and size affect the acceleration statistics of bubbles in turbulence How gravity and size affect the acceleration statistics of bubbles in turbulence

2012-04-18

arxiv.org/abs/1204.4108v1

Physics

Fluid Dynamics

5 pages, 5 figures

Scientific paper

We report results from the first systematic Lagrangian experimental investigation in the regime of very light (air bubbles in water) and large particles (D/{\eta} in the range of 7.3--12.5) in turbulence. The experiments reveal that gravity increases the acceleration variance and reduces the intermittency of the PDF in the vertical direction. Once the gravity offset is subtracted, the variances of both the horizontal and vertical acceleration components are about 5\pm2 times larger than the one measured in the same flow for fluid tracers. Moreover, for these light particles, the experimental acceleration PDF shows a substantial reduction in intermittency at growing size ratios, in contrast to neutrally buoyant or heavy particles. All these results are closely matched by numerical simulations of finite-size bubbles with the Fax\'en corrections.

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