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Large-Scale Structures and Heat Transport of Turbulent Forced and Mixed Convection in a Closed Cavity

Schmeling, Daniel and Westhoff, Andreas and Kühn, Matthias and Bosbach, Johannes and Wagner, Claus (2011) Large-Scale Structures and Heat Transport of Turbulent Forced and Mixed Convection in a Closed Cavity. International Journal of Heat and Fluid Flow, Vol. 3 (5), pp. 889-900. Elsevier. doi: 10.1016/j.ijheatfluidflow.2011.06.006. ISBN 0142-727X. ISSN 0142-727X.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0142727X11000944


An experimental investigation of flow structure formation in turbulent forced and mixed convection in a closed rectangular cavity with an aspect ratio of 1:1:5 and air as working fluid is presented. Forced convection at 1.07x10^4 < Re < 3.5x10^4 and mixed convection at 1.01x10^4 < Re < 3.4x10^4 and Ra=2.4x10^8 are studied under well-defined conditions by means of Particle Image Velocimetry and local temperature measurements. For purely forced convection a 2D mean wind, which can be approximated by a solid body rotation (Rankine vortex), is found. With increasing Archimedes number (Ar), realised by a temperature gradient between bottom and ceiling of the convection cell, this structure becomes instable, leading to four convection rolls for Ar>1.7. These rolls are oriented in longitudinal direction of the cell and their rotation direction alternates for different Archimedes numbers, realising an updraught for Ar=2.2 and a downdraught for Ar=1.7 and Ar=3.3 in the central cross section. Temperature measurements of the outflowing air reveal a temporally and spatially constant fingerprint with two maxima over the length of the outlet. Investigations of the enthalpy transport of the fluid indicate the existence of a maximal enthalpy transport by the fluid for approximately Ar=0.6.

Item URL in elib:https://elib.dlr.de/62594/
Document Type:Article
Title:Large-Scale Structures and Heat Transport of Turbulent Forced and Mixed Convection in a Closed Cavity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schmeling, DanielDaniel.Schmeling (at) dlr.deUNSPECIFIED
Westhoff, AndreasAndreas.Westhoff (at) dlr.deUNSPECIFIED
Kühn, MatthiasMatthias.Kuehn (at) dlr.deUNSPECIFIED
Bosbach, JohannesJohannes.Bosbach (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Journal or Publication Title:International Journal of Heat and Fluid Flow
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 3
DOI :10.1016/j.ijheatfluidflow.2011.06.006
Page Range:pp. 889-900
EditorsEmailEditor's ORCID iD
Series Name:Science Direct
Keywords:PIV; mixed convection; rectangular cavity; large scale structures; heat transport; enthalpy flux
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Schmeling, Dr Daniel
Deposited On:14 Jan 2010 15:14
Last Modified:06 Sep 2019 15:26

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