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Turbulence-induced secondary motion in a buoyancy-driven flow in a circular pipe

Hallez, Yannick and Magnaudet, Jacques Turbulence-induced secondary motion in a buoyancy-driven flow in a circular pipe. (2009) Physics of Fluids, vol. 21 (n° 8). pp. 1-4. ISSN 1070-6631

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Official URL: http://dx.doi.org/10.1063/1.3213246

Abstract

We analyze the results of a direct numerical simulation of the turbulent buoyancy-driven flow that sets in after two miscible fluids of slightly different densities have been initially superimposed in an unstable configuration in an inclined circular pipe closed at both ends. In the central region located midway between the end walls, where the flow is fully developed, the resulting mean flow is found to exhibit nonzero secondary velocity components in the tube cross section. We present a detailed analysis of the generation mechanism of this secondary flow which turns out to be due to the combined effect of the lateral wall and the shear-induced anisotropy between the transverse components of the turbulent velocity fluctuations.

Item Type:Article
Additional Information:Thanks to American Institute of Physics editor. The definitive version is available at http://pof.aip.org/ The original PDF of the article can be found at Physics of Fluids website : http://pof.aip.org/resource/1/phfle6/v21/i8/p081704_s1
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Yannick Hallez

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