Schmeling, Daniel und Bosbach, Johannes und Wagner, Claus (2012) PERIODIC AND QUASIPERIODIC TEMPERATURE OSCILLATIONS IN MIXED CONVECTION. 23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012), 2012-08-19 - 2012-08-24, Peking, China.
PDF
- Nur DLR-intern zugänglich
428kB |
Offizielle URL: http://www.ictam2012.org/
Kurzfassung
We report on temperature oscillations which we observed during experiments in turbulent mixed convection at Ra=2.0x10e8 in a rectangular enclosure with a length of L=2500 mm and aspect ratios of L/H=5 (length over height) and W/H=1 (width over height), heated from below and cooled from above. The measurements were conducted using an arrangement of PT-100 temperature sensors. Depending on the Reynolds number of the flow entering the cell, and thus the Archimedes number, we detected stable flow conditions as well as quasiperiodic and periodic oscillations in the temperature field. Comparison with smoke visualisations allowed us to ascribe the respective temperature distribution to a certain number and arrangement of large scale circulations (LSCs) in the flow. We interpret the temperature oscillations, which reach the highest frequency f=2.0x10e-3 1/s at Ar=1.8, as motions of the LSCs in longitudinal cell direction.
elib-URL des Eintrags: | https://elib.dlr.de/74304/ | ||||||||
---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Konferenzbeitrag (Vortrag, Paper) | ||||||||
Zusätzliche Informationen: | Abstract Book of the 23rd International Congress of Theoretical and Applied Mechanics, Page: 311, ISBN: 978-988-16022-3-7 | ||||||||
Titel: | PERIODIC AND QUASIPERIODIC TEMPERATURE OSCILLATIONS IN MIXED CONVECTION | ||||||||
Autoren: |
| ||||||||
Datum: | 2012 | ||||||||
Open Access: | Nein | ||||||||
In SCOPUS: | Nein | ||||||||
In ISI Web of Science: | Nein | ||||||||
Name der Reihe: | Conference Proceedings on DVD-ROM 1.4G | ||||||||
Stichwörter: | Turbulent mixed convection, Experimental temperature measurements, Temperature oscillations, Large scale circulations | ||||||||
Veranstaltungstitel: | 23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012) | ||||||||
Veranstaltungsort: | Peking, China | ||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||
Veranstaltungsbeginn: | 19 August 2012 | ||||||||
Veranstaltungsende: | 24 August 2012 | ||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||
Standort: | Göttingen | ||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Fluidsysteme |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags