Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2013) Oscillations of the large-scale circulation in turbulent mixed convection in a closed rectangular cavity. Experiments in Fluids, Vol. 5 (5), pp. 1-15. Springer. doi: 10.1007/s00348-013-1517-3. ISSN 0723-4864.
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Official URL: http://link.springer.com/article/10.1007/s00348-013-1517-3
Abstract
Fluid temperature time series are recorded in turbulent mixed convection at specific locations inside a cuboidal convection cell. They reveal instabilities of the large-scale flow structures, which organise the heat transport in an intermediate range of Archimedes numbers, where buoyancy and inertia forces are of similar strength. The instabilities lead to periodic or spontaneous transitions between three and four convection rolls. Further, for either high Rayleigh or Reynolds numbers, for which the flow is either governed by buoyancy or by inertia forces, respectively, stable large-scale circulations (LSCs) develop. In the intermediate Ra–Re number regime, we ascribe the complex dynamics, visible as oscillation in the temperature time series, to the interaction of the pressure-driven wall jet at the ceiling with the buoyancy-driven LSCs. The maximal main oscillation frequency is about one order of magnitude smaller than the turnover frequencies of either the wall jet-induced circulation rolls or thermally induced LSCs. It is further shown that the periodic reconfigurations of the LSCs can be controlled by adjusting the inflow velocity, that is, the Reynolds number, to generate stable LSCs.
Item URL in elib: | https://elib.dlr.de/76707/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Additional Information: | Online ISSN: 1432-1114, Article:1517 | ||||||||||||
Title: | Oscillations of the large-scale circulation in turbulent mixed convection in a closed rectangular cavity | ||||||||||||
Authors: |
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Date: | 2013 | ||||||||||||
Journal or Publication Title: | Experiments in Fluids | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | Yes | ||||||||||||
In ISI Web of Science: | Yes | ||||||||||||
Volume: | Vol. 5 | ||||||||||||
DOI: | 10.1007/s00348-013-1517-3 | ||||||||||||
Page Range: | pp. 1-15 | ||||||||||||
Publisher: | Springer | ||||||||||||
ISSN: | 0723-4864 | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | mixed convection, cuboidal cavity, oscillations, reconfigurations, large-scale circulation | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||
HGF - Program: | Transport | ||||||||||||
HGF - Program Themes: | Terrestrial Vehicles (old) | ||||||||||||
DLR - Research area: | Transport | ||||||||||||
DLR - Program: | V BF - Bodengebundene Fahrzeuge | ||||||||||||
DLR - Research theme (Project): | V - Projekt Next Generation Train (old) | ||||||||||||
Location: | Göttingen | ||||||||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Fluid Systems | ||||||||||||
Deposited By: | Schmeling, Dr Daniel | ||||||||||||
Deposited On: | 15 May 2013 16:08 | ||||||||||||
Last Modified: | 06 Sep 2019 15:25 |
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