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  Flutter to tumble transition of buoyant spheres triggered by rotational inertia changes

Mathai, V., Zhu, X., Sun, C., & Lohse, D. (2018). Flutter to tumble transition of buoyant spheres triggered by rotational inertia changes. Nature Communications, 9: 1792. doi:10.1038/s41467-018-04177-w.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-44FA-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CCC0-E
Genre: Journal Article

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 Creators:
Mathai, V., Author
Zhu, X., Author
Sun, C., Author
Lohse, Detlef1, Author              
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: Heavy particles sink straight in water, while buoyant bubbles and spheres may zigzag or spiral as they rise. The precise conditions that trigger such path-instabilities are still not completely understood. For a buoyant rising sphere, two parameters are believed to govern the development of unsteady dynamics: the particle's density relative to the fluid, and its Galileo number. Consequently, with these parameters specified, the opportunities for variation in particle dynamics appear limited. In contrast to this picture, here we demonstrate that vigorous path-oscillations can be triggered by modulating a spherical particle's moment of inertia (MoI). For a buoyant sphere rising in a turbulent flow, MoI reduction triggers a tumble-flutter transition, while in quiescent liquid, it induces a modification of the sphere wake resulting in large-amplitude path-oscillations. The present finding opens the door for control of particle path- and wake-instabilities, with potential for enhanced mixing and heat transfer in particle-laden and dispersed multiphase environments.

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Language(s): eng - English
 Dates: 2018-05-04
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41467-018-04177-w
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Title: Nature Communications
Source Genre: Journal
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Pages: 7 Volume / Issue: 9 Sequence Number: 1792 Start / End Page: - Identifier: -