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  Drag reduction in boiling Taylor-Couette turbulence

Ezeta, R., Bakhuis, D., Huisman, S. G., Sun, C., & Lohse, D. (2019). Drag reduction in boiling Taylor-Couette turbulence. Journal of Fluid Mechanics, 881, 104-118. doi:10.1017/jfm.2019.758.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-80D2-C Version Permalink: http://hdl.handle.net/21.11116/0000-0005-80D3-B
Genre: Journal Article

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 Creators:
Ezeta, R., Author
Bakhuis, D., Author
Huisman, S. G., 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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Free keywords: boiling; drag reduction; rotating turbulence
 Abstract: We create a highly controlled laboratory environment - accessible to both global and local monitoring - to analyse turbulent boiling flows and in particular their shear stress in a statistically stationary state. By precisely monitoring the drag of strongly turbulent Taylor-Couette flow (the flow in between two coaxially rotating cylinders, Reynolds number Re approximate to 10(6)) during its transition from non-boiling to boiling, we show that the intuitive expectation, namely that a few volume per cent of vapour bubbles would correspondingly change the global drag by a few per cent, is wrong. Rather, we find that for these conditions a dramatic global drag reduction of up to 45% occurs. We connect this global result to our local observations, showing that for major drag reduction the vapour bubble deformability is crucial, corresponding to Weber numbers larger than one. We compare our findings with those for turbulent flows with gas bubbles, which obey very different physics from those of vapour bubbles. Nonetheless, we find remarkable similarities and explain these.

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Language(s): eng - English
 Dates: 2019-10-242019-12-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1017/jfm.2019.758
 Degree: -

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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 881 Sequence Number: - Start / End Page: 104 - 118 Identifier: -