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# Dynamics of large-scale structures and heat transfer in turbulent mixed convection

Westhoff, Andreas and Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2010) Dynamics of large-scale structures and heat transfer in turbulent mixed convection. In: Proceedings of the Sixth Int. Symposium on turbulence, Heat and Mass Transfer Turbulence, Heat and Mass Tranfer 6. Begell House Inc. New York, Wallingford (UK). pp. 107-110. ISBN 978-1-56700-262-1.

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Official URL: http://www.ichmt.org

## Abstract

Low frequency oscillations have been observed in the heat transfer of mixed convection in a rectangular cavity with an aspect ratio of $\Gamma_{\mathrm{xz}} = 1$ and $\Gamma_{\mathrm{yz}} = 5$.~Mixed convective flow at $Ra = 2.4 \times 10^8$, $Re = 1.0 \times 10^{4}$, $Ar = 3.3$ and $Pr \approx 0.7$ has been studied to determine the nature of these oscillations. Therefore Particle Image Velocimetry (PIV) and temperature measurements have been performed under ambient and high pressure conditions. The PIV results have been analysed using Proper Orthogonal Decomposion (POD) to identify the characteristic frequencies of the coherent large-scale structures and their dynamics have been compared with the low frequency oscillations found in the heat transfer.

Document Type:Contribution to a Collection
Title:Dynamics of large-scale structures and heat transfer in turbulent mixed convection
Authors:
AuthorsInstitution or Email of Authors
Westhoff, Andreasandreas.westhoff@dlr.de
Schmeling, Danieldaniel.schmeling@dlr.de
Bosbach, Johannesjohannes.bosbach@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Date:September 2010
Journal or Publication Title:Proceedings of the Sixth Int. Symposium on turbulence, Heat and Mass Transfer
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 107-110
Editors:
EditorsEmail
Hanjalic, K.UNSPECIFIED
Nagano, Y.UNSPECIFIED
Jakirlic, S.UNSPECIFIED
Publisher:Begell House Inc. New York, Wallingford (UK)
Series Name:Turbulence, Heat and Mass Tranfer 6
ISBN:978-1-56700-262-1
Status:Published
Keywords:mixed convection, turbulence, heat transfer, large scale circulations
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems & Cabin
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Ilka Micknaus
Deposited On:20 Dec 2010 15:13