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

Schmeling, Daniel und Westhoff, Andreas und Kühn, Matthias und Bosbach, Johannes und 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), Seiten 889-900. Elsevier. DOI: 10.1016/j.ijheatfluidflow.2011.06.006. ISBN 0142-727X. ISSN 0142-727X.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Large-Scale Structures and Heat Transport of Turbulent Forced and Mixed Convection in a Closed Cavity
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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
Datum:2011
Erschienen in:International Journal of Heat and Fluid Flow
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:Vol. 3
DOI :10.1016/j.ijheatfluidflow.2011.06.006
Seitenbereich:Seiten 889-900
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Gatski, T.B.NICHT SPEZIFIZIERT
Kasagi, N.NICHT SPEZIFIZIERT
Launder, B.E.NICHT SPEZIFIZIERT
Verlag:Elsevier
Name der Reihe:Science Direct
ISSN:0142-727X
ISBN:0142-727X
Status:veröffentlicht
Stichwörter:PIV; mixed convection; rectangular cavity; large scale structures; heat transport; enthalpy flux
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme
Hinterlegt von: Daniel Schmeling
Hinterlegt am:14 Jan 2010 15:14
Letzte Änderung:12 Dez 2013 20:52

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