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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

Abstract

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.

Document Type:Article
Title:Large-Scale Structures and Heat Transport of Turbulent Forced and Mixed Convection in a Closed Cavity
Authors:
AuthorsInstitution or Email of Authors
Schmeling, DanielDaniel.Schmeling@dlr.de
Westhoff, AndreasAndreas.Westhoff@dlr.de
Kühn, MatthiasMatthias.Kuehn@dlr.de
Bosbach, JohannesJohannes.Bosbach@dlr.de
Wagner, ClausClaus.Wagner@dlr.de
Date:2011
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.2011.06.006
Page Range:pp. 889-900
Editors:
EditorsEmail
Gatski, T.B.UNSPECIFIED
Kasagi, N.UNSPECIFIED
Launder, B.E.UNSPECIFIED
Publisher:Elsevier
Series Name:Science Direct
ISSN:0142-727X
ISBN:0142-727X
Status:Published
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
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: Daniel Schmeling
Deposited On:14 Jan 2010 15:14
Last Modified:12 Dec 2013 20:52

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