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Temperature Oscillations in Turbulent Mixed Convective Air Flows

Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2014) Temperature Oscillations in Turbulent Mixed Convective Air Flows. In: Turbulence and Interactions Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 125. Springer Verlag, Berlin Heidelberg. pp. 157-163. ISBN 978-3-662-43488-8. ISSN 1612-2909

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Official URL: http://link.springer.com/chapter/10.1007/978-3-662-43489-5_19

Abstract

We report on measurements of temperature oscillations observed in turbulent mixed convection in a rectangular enclosure. They are correlated to fluctuations and spontaneous reorientations of the large-scale circulations in the flow. Stable temperature configurations, periodic reconfigurations as well as spontaneous reversals and reorientations were detected. We ascribe the observed dynamics of the largescale flow to the interaction between the superimposed shear forces of the forced convective flow and the buoyancy driven flow. Comparison with smoke visualisations allowed to assign the observed temperature distributions to a certain number and configuration of convection rolls. A frequency analysis of the oscillations as a function of the characteristic numbers is conducted revealing a sophisticated dependency of the dynamics of the large-scale flow on Ar, Re or Ra.

Item URL in elib:https://elib.dlr.de/75617/
Document Type:Contribution to a Collection
Additional Information:DOI: 10.1007/978-3-662-43489-5_19, Online ISBN: 978-3-662-43489-5, Proceedings of the TI 2012 Conference
Title:Temperature Oscillations in Turbulent Mixed Convective Air Flows
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmeling, DanielDaniel.Schmeling (at) dlr.deUNSPECIFIED
Bosbach, JohannesJohannes.Bosbach (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:2014
Journal or Publication Title:Turbulence and Interactions
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:125
Page Range:pp. 157-163
Editors:
EditorsEmail
Deville, Michel O.Ecole Polytechnique Fédérale de Lausanne, Switzerland
Lê, Thien-HiepONERA Chatillon, France
Estivalezes, Jean-LucONERA Toulouse, France
Terracol, MarcONERA Chatillon, France
Gleize, VincentONERA Chatillon, France
Vincent, StéphaneENSCBP Pessac, France
Publisher:Springer Verlag, Berlin Heidelberg
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-662-43488-8
Status:Published
Keywords:Temperature Oscillations, Mixed Convection, Air Flow
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:18 Sep 2014 15:57
Last Modified:18 Sep 2014 15:57

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