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  Confined inclined thermal convection in low-Prandtl-number fluids

Zwirner, L., & Shishkina, O. (2018). Confined inclined thermal convection in low-Prandtl-number fluids. Journal of Fluid Mechanics, 850, 984-1008. doi:10.1017/jfm.2018.477.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D9F9-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D977-3
Genre: Journal Article

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 Creators:
Zwirner, Lukas1, Author              
Shishkina, Olga1, Author              
Affiliations:
1Laboratory for Fluid Physics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

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Free keywords: Bénard convection, convection in cavities, turbulent convection
 Abstract: Any tilt of a Rayleigh–Bénard convection cell against gravity changes the global flow structure inside the cell, which leads to a change of the heat and momentum transport. Especially sensitive to the inclination angle is the heat transport in low-Prandtl-number fluids and confined geometries. The purpose of the present work is to investigate the global flow structure and its influence on the global heat transport in inclined convection in a cylindrical container of diameter-to-height aspect ratio Γ = 1/5. The study is based on direct numerical simulations where two different Prandtl numbers Pr = 0.1 and 1.0 are considered, while the Rayleigh number, Ra, ranges from 106 to 109. For each combination of Ra and Pr, the inclination angle is varied between 0 and π/2. An optimal inclination angle of the convection cell, which provides the maximal global heat transport, is determined. For inclined convection we observe the formation of two system-sized plume columns, a hot and a cold one, that impinge on the opposite boundary layers. These are related to a strong increase in the heat transport.

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Language(s): eng - English
 Dates: 2018-07-102018-09-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1017/jfm.2018.477
 Degree: -

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Title: Journal of Fluid Mechanics
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 850 Sequence Number: - Start / End Page: 984 - 1008 Identifier: -