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  Controlling heat transport and flow structures in thermal turbulence using ratchet surfaces

Jiang, H., Zhu, X., Mathai, V., Verzicco, R., Lohse, D., & Sun, C. (2018). Controlling heat transport and flow structures in thermal turbulence using ratchet surfaces. Physical Review Letters, 120(4): 044501. doi:10.1103/PhysRevLett.120.044501.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-72E0-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CF47-5
Genre: Journal Article

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

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 Abstract: In this combined experimental and numerical study on thermally driven turbulence in a rectangular cell, the global heat transport and the coherent flow structures are controlled with an asymmetric ratchetlike roughness on the top and bottom plates. We show that, by means of symmetry breaking due to the presence of the ratchet structures on the conducting plates, the orientation of the large scale circulation roll (LSCR) can be locked to a preferred direction even when the cell is perfectly leveled out. By introducing a small tilt to the system, we show that the LSCR orientation can be tuned and controlled. The two different orientations of LSCR give two quite different heat transport efficiencies, indicating that heat transport is sensitive to the LSCR direction over the asymmetric roughness structure. Through a quantitative analysis of the dynamics of thermal plume emissions and the orientation of the LSCR over the asymmetric structure, we provide a physical explanation for these findings. The current work has important implications for passive and active flow control in engineering, biofluid dynamics, and geophysical flows.

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Language(s): eng - English
 Dates: 2018-01-262018-01-26
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.120.044501
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Title: Physical Review Letters
Source Genre: Journal
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Pages: 5 Volume / Issue: 120 (4) Sequence Number: 044501 Start / End Page: - Identifier: -