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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 (2009) Dynamics of large-scale structures and heat transfer in turbulent mixed convection. Begell House Inc. New York, Wallingford (UK). Turbulence, Heat and Mass transfer 6, 14.-18. Sep. 2009, Rom, Italy.

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## 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:Conference or Workshop Item (Speech, Paper)
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 2009
Refereed publication:No
In ISI Web of Science:No
Publisher:Begell House Inc. New York, Wallingford (UK)
Status:Published
Keywords:mixed convection, turbulence, heat transfer, large scale circulations
Event Title:Turbulence, Heat and Mass transfer 6
Event Location:Rom, Italy
Event Type:international Conference
Event Dates:14.-18. Sep. 2009
Organizer:Department of Mechanics and Aeronautics Sapienza University of Rome, Italy
HGF - Research field:Aeronautics, Space and Transport
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: Andreas Westhoff
Deposited On:20 Dec 2010 15:12

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