elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Turbulent structures and budgets behind permeable ribs

Panigrahi, Pradipta Kumar und Schröder, Andreas und Kompenhans, Jürgen (2007) Turbulent structures and budgets behind permeable ribs. Experimental Thermal and Fluid Sciences (32), Seiten 1011-1033. ELSEVIER. DOI: 10.1016/j.expthermflusci.2007.11.019.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Offizielle URL: http://www.sciencedirect.com

Kurzfassung

Different rib geometries are traditionally used to improve heat transfer and enhance mixing in different industrial applications i.e. heat exchangers, cooling passages of gas turbine blades and fuel elements of nuclear reactors etc. Permeable ribs have been proposed in literature for passive control of the reattaching flow past surface mounted ribs leading to superior performance. The flow past different surface mounted permeable rib geometries i.e. solid, slit, split-slit and inclined split-slit ribs have been investigated in this study. Both two-component and stereo Particle image velocimetry (PIV) have been used in streamwise and cross stream planes to study the underlying flow structures. The detailed turbulent statistics i.e. mean and rms velocity, higher order moments, quadrant decomposition of turbulent shear stress producing motions, skewness and components of the turbulent kinetic energy budgets have been compared for different rib geometries. The reattachment length of the inclined split-slit rib is lowest among all rib geometries. The average Reynolds stresses and the production of turbulent kinetic energy are highest for the inclined split-slit rib. The pressure transport calculated as residual of the turbulent kinetic energy budget equation is highest for the inclined split-slit rib. This is attributed to the smaller reattachment length leading to greater adverse pressure gradient for the inclined split-slit rib. The quadrant motions, turbulent fluxes, skewness and kinetic energy budgets at post reattachment region compares well with that of flat plate turbulent boundary layer from hot wire measurements in literature. Overall, this study demonstrates the effectiveness of PIV technique for the detailed turbulent structures characterization of complex flows.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:2nd Review
Titel:Turbulent structures and budgets behind permeable ribs
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Panigrahi, Pradipta KumarDepartment of Mechanical Engineering, IIT Kanpur, U.P. 208016, India
Schröder, AndreasNICHT SPEZIFIZIERT
Kompenhans, JürgenNICHT SPEZIFIZIERT
Datum:2007
Erschienen in:Experimental Thermal and Fluid Sciences
Referierte Publikation:Ja
In ISI Web of Science:Ja
DOI :10.1016/j.expthermflusci.2007.11.019
Seitenbereich:Seiten 1011-1033
Verlag:ELSEVIER
Name der Reihe:ScieneDirect
Status:veröffentlicht
Stichwörter:PIV, Rib, Skewness, Coherent structures, Quadrant analysis, Wavelet, Kinetic energy Budget
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
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 > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:07 Apr 2008
Letzte Änderung:15 Jan 2010 01:59

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.