Using cavitation as a probe of low-pressure filaments in turbulence

Moisy, F.; la Porta, A.; Voth, G.; Bodenschatz, E.

doi:10.1007/3-540-44535-8_17

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Using cavitation as a probe of low-pressure filaments in turbulence

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Bodenschatz, E.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Moisy, F., la Porta, A., Voth, G., & Bodenschatz, E. (2000). Using cavitation as a probe of low-pressure filaments in turbulence. In A. Maurel, & P. Petitjeans (Eds.), Vortex Structure and Dynamics. Springer.

Cite as: https://hdl.handle.net/21.11116/0000-0003-FD3D-D

Abstract

We report new observations of low-pressure filaments in a turbulent flow between counter-rotating disks. Cavitation from microscopic gas bubbles seeding the water is used to probe the structure of the pressure field. The spatial structure of the low-pressure events, mainly vertical filaments standing along the disks axis, are visualized using a high speed video system. The negative tail of the probability density functions of pressure is determined from light scattering measurements performed with a fast photo detector, and is found to be exponential. These observations highlight the importance of the large scales on the pressure fluctuations