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Large-scale coherent structure dynamics and heat transport in turbulent mixed convective air

Westhoff, Andreas and Bosbach, Johannes and Wagner, Claus (2014) Large-scale coherent structure dynamics and heat transport in turbulent mixed convective air. In: New Results in Numerical and Experimental Fluid Mechanics IX Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 124. Springer Verlag, Cham Heidelberg New York Dordrecht London. pp. 285-292. ISBN 978-3-319-03157-6. ISSN 1612-2909

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Official URL: http://link.springer.com/chapter/10.1007/978-3-319-03158-3_29

Abstract

We report on an experimental study of mixed convective air flow in a cuboidal container with an inlet and outlet slot at Ar = 3.3, Re = 1.0 × 10^4, Ra = 2.4×10^8 at a fluid pressure of P = 11.6 bar. Particle image velocimetry were performed with the objective to identify the dynamics of the large-scale circulations. In addition, we applied temperature measurements to determine the heat transport. Due to the unsteady nature of mixed convection in the present configuration, the velocity vector fields were subjected to a proper orthogonal decomposition in order to extract the predominant coherent structures. The analysis uncovers two structures consisting of three and four thermally induced large-scale circulations, which are arranged in longitudinal direction. Further, we found that the dynamics and the topology of the convection rolls strongly influences the heat transport between the container‘s inlet and outlet.

Item URL in elib:https://elib.dlr.de/79335/
Document Type:Contribution to a Collection
Additional Information:DOI: 10.1007/978-3-319-03158-3_29; ISSN: 1860-0824 (electronic); ISBN 978-3-319-03158-3: (eBook); Library of Congress Control Number: 2013957123
Title:Large-scale coherent structure dynamics and heat transport in turbulent mixed convective air
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Westhoff, Andreasandreas.westhoff (at) dlr.deUNSPECIFIED
Bosbach, Johannesjohannes.bosbach (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:New Results in Numerical and Experimental Fluid Mechanics IX
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:124
Page Range:pp. 285-292
Editors:
EditorsEmail
Dillmann, AndreasDLR
Heller, GerdAirbus Deutschalnd
Krämer, EwaldUni Stuttgart
Kreplin, Hans-PeterDLR
Nitsche, WolfgangTU Berlin
Rist, UlrichUni Stuttgart
Publisher:Springer Verlag, Cham Heidelberg New York Dordrecht London
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-319-03157-6
Status:Published
Keywords:turbulent mixed convection, proper orthogonal decomposition, coherent structures, large-scale circulation, heat transport
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 - Project Next Generation Train II (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Westhoff, Andreas
Deposited On:26 Mar 2014 13:32
Last Modified:13 Apr 2015 16:59

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