3D-PTV measurements in a plane Couette flow

Dominik Krug*, Beat Lüthi, Hansjörg Seybold, Markus Holzner, Arkady Tsinober

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Genuine plane Couette flow is hard to realize experimentally, and no applications of modern spatially resolving measurement techniques have been reported for this flow so far. In order to resolve this shortcoming, we designed and built a new experimental facility and present our first results here. Our setup enables us to access the flow via 3D particle tracking velocimetry and therefore to obtain truly three-dimensional flow fields for the first time experimentally in plane Couette flow. Results are analyzed in terms of basic flow properties, and a clear distinction of flow regimes (laminar for Re<320, transitional for 320<Re<400, and turbulent when Re>400) could be made. Comparison with DNS data shows good agreement in the turbulent regime and builds trust in our data. Furthermore, vortical coherent structures are studied in detail with the additional help of kalliroscope imaging, and the typical vortex spacing is determined to be roughly one gap width. As a noteworthy result, we find that the onset of the turbulent regime coincides with the range of Reynolds numbers at which a distance of 100 wall units is comparable to the gap width.

Original languageEnglish
Pages (from-to)1349-1360
Number of pages12
JournalExperiments in Fluids
Volume52
Issue number5
DOIs
StatePublished - May 2012

Funding

FundersFunder number
Lufthansa Technik AG
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung2-77898-10

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