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  Bubble drag reduction requires large bubbles.

Verschoof, R. A., van der Veen, R. C. A., Sun, C., & Lohse, D. (2016). Bubble drag reduction requires large bubbles. Physical Review Letters, 117(10): 104502. doi:10.1103/PhysRevLett.117.104502.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-8585-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-411E-E
Genre: Journal Article

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 Creators:
Verschoof, R. A., Author
van der Veen, R. C. A., 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: In the maritime industry, the injection of air bubbles into the turbulent boundary layer under the ship hull is seen as one of the most promising techniques to reduce the overall fuel consumption. However, the exact mechanism behind bubble drag reduction is unknown. Here we show that bubble drag reduction in turbulent flow dramatically depends on the bubble size. By adding minute concentrations (6 ppm) of the surfactant Triton X-100 into otherwise completely unchanged strongly turbulent Taylor-Couette flow containing bubbles, we dramatically reduce the drag reduction from more than 40% to about 4%, corresponding to the trivial effect of the bubbles on the density and viscosity of the liquid. The reason for this striking behavior is that the addition of surfactants prevents bubble coalescence, leading to much smaller bubbles. Our result demonstrates that bubble deformability is crucial for bubble drag reduction in turbulent flow and opens the door for an optimization of the process.

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Language(s): eng - English
 Dates: 2016-09-012016-09-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.117.104502
 Degree: -

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Title: Physical Review Letters
Source Genre: Journal
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Pages: 4 Volume / Issue: 117 (10) Sequence Number: 104502 Start / End Page: - Identifier: -