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Experimental study of low-frequency oscillations and large-scale circulations in turbulent mixed convection

Westhoff, Andreas and Bosbach, Johannes and Schmeling, Daniel and Wagner, Claus (2010) Experimental study of low-frequency oscillations and large-scale circulations in turbulent mixed convection. International Journal of Heat and Fluid Flow, Vol. 3 (5), pp. 794-804. ELSEVIER. DOI: 10.1016/j.ijheatfluidflow.2010.04.013. ISSN 0142-727X.

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Official URL: http://www.elsevier.com/locate/ijhff

Abstract

The formation and dynamics of large-scale circulations in forced and mixed convection has been studied at ambient and elevated fluid pressure by means of particle image velocimetry and temperature measurements. The study has been conducted in two rectangular containers of the same shape and aspect ratios of Cxz = 1 and Cyz = 5. For the measurements at high fluid pressure the dimensions of the cell have been scaled down by a factor of 5. Air with Pr = 0.7 has been used as fluid in both configurations. Forced convection has been investigated at Re = 1.01 x 104 and mixed convection has been studied at Ar = 3.3, Re = 1.01 x 10 up4 and Ra = 2.4 x 10 up8. In this configuration low-frequency oscillations in the heat transfer between the inlet and outlet have been found for mixed convection. Instantaneous velocity vector fields obtained from particle image velocimetry have been analysed using proper orthogonal decomposition and an algorithm to detect the core and the core centre position of large-scale circulations.

Document Type:Article
Additional Information:Available online 1 June 2010
Title:Experimental study of low-frequency oscillations and large-scale circulations in turbulent mixed convection
Authors:
AuthorsInstitution or Email of Authors
Westhoff, Andreasandreas.westhoff@dlr.de
Bosbach, JohannesUNSPECIFIED
Schmeling, DanielUNSPECIFIED
Wagner, ClausUNSPECIFIED
Date:2010
Journal or Publication Title:International Journal of Heat and Fluid Flow
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 3
DOI:10.1016/j.ijheatfluidflow.2010.04.013
Page Range:pp. 794-804
Editors:
EditorsEmail
Kasagi, N.UNSPECIFIED
Launder, B.E.UNSPECIFIED
Publisher:ELSEVIER
ISSN:0142-727X
Status:Published
Keywords:Large-scale circulations, Particle image velocimetry, Proper orthogonal decomposition, Turbulent mixed convection Forced convection, Low-frequency oscillations, low frequency oscillations
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 - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Andreas Westhoff
Deposited On:24 Aug 2010 10:08
Last Modified:12 Dec 2013 20:49

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