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PIV investigation of flow behind surface mounted permeable ribs

Panigrahi, Praditpa K. und Schröder, Andreas und Kompenhans, Jürgen (2005) PIV investigation of flow behind surface mounted permeable ribs. Experiments in Fluids, Vol. 40, Seiten 277-300. Springer-Verlag GmbH. DOI: 10.1007/s00348-005-0067-8. ISSN 0723-4864 Paper.

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Kurzfassung

The flow behind surface mounted permeable rib geometries, i.e. solid, slit, split-slit and inclined split-slit ribs have been studied using flow visualization and PIV (2-C and 3-C) technique in streamwise and cross-stream measurement planes. The objective behind this study is to understand the flow structures responsible for heat transfer/mixing enhancement with simultaneous pressure penalty reduction by permeable rib geometries. The Reynolds number based on the rib height has been set equal to 5,538 and the open area ratio of permeable ribs is equal to 20%. The permeable rib geometries have shorter reattachment length in comparison to the solid rib. The maximum 41% reduction in reattachment length is observed for the inclined split-slit rib. The splitter mounted inside the slit leads to two corner vortices behind it. The corner vortices drag the flow from the primary recirculation bubble region towards the rib resulting in drop of the reattachment length. Two horseshoe vortices are present in the flow through the slit at both sides of the splitter due to the upstream flow separation. The slit inclination moves these horseshoe vortices closer to the bottom wall. A film like flow through the slit is present near the downstream corner of the inclined split-slit rib. The spanwise velocity gradient due to the splitter leads to vorticity and turbulence enhancement by vortex stretching. The inclination of the slit and the use of a splitter inside the slit are two important design parameters responsible in generation of near-wall longitudinal vortices. The flow field behind permeable ribs is dominated by vortical structures with definable critical flow patterns, i.e. node, saddle and foci. These predominant swirling flow motions contribute to the mixing enhancement behind permeable rib geometries.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen:Published online: 23. November 2005, 1432-114 (Online), Springer-Verlag
Titel:PIV investigation of flow behind surface mounted permeable ribs
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Panigrahi, Praditpa K.NICHT SPEZIFIZIERT
Schröder, AndreasNICHT SPEZIFIZIERT
Kompenhans, JürgenNICHT SPEZIFIZIERT
Datum:März 2005
Erschienen in:Experiments in Fluids
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:Vol. 40
DOI :10.1007/s00348-005-0067-8
Seitenbereich:Seiten 277-300
Verlag:Springer-Verlag GmbH
ISSN:0723-4864 Paper
Status:veröffentlicht
Stichwörter:flow visualization, PIV, Reynolds number
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:19 Jun 2006
Letzte Änderung:14 Jan 2010 20:38

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