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Turbulence attenuation by large neutrally buoyant particles

MPG-Autoren
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Saw,  E. W.
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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

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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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Zitation

Cisse, M., Saw, E. W., Gibert, M., Bodenschatz, E., & Bec, J. (2015). Turbulence attenuation by large neutrally buoyant particles. Physics of Fluids, 27(6): 061702. doi:10.1063/1.4922241.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0029-7DB4-9
Zusammenfassung
Turbulence modulation by inertial-range-size, neutrally buoyant particles is investigated experimentally in a von K?rm?n flow. Increasing the particle volume fraction �v, maintaining constant impellers Reynolds number attenuates the fluid turbulence. The inertial-range energy transfer rate decreases as ? �2/3 v , suggesting that only particles located on a surface affect the flow. Small-scale turbulent properties, such as structure functions or acceleration distribution, are unchanged. Finally, measurements hint at the existence of a transition between two different regimes occurring when the average distance between large particles is of the order of the thickness of their boundary layers.