Title: Influence of secondary flow corner vortex to boundary layer in a channel flow
Other Titles: Vliv sekundárního proudění na mezní vrstvu v kanále
Authors: Duda, Daniel
Bém, Jindřich
Kovařík, Jiří
Yanovych, Vitalii
Uruba, Václav
Citation: DUDA, D., BÉM, J., KOVAŘÍK, J., YANOVYCH, V., URUBA, V. Influence of secondary flow corner vortex to boundary layer in a channel flow. In: AIP Conference Proceedings. Liptovský Mikuláš: American Institute of Physics Inc., 2019. s. 030011-1-030011-4. ISBN 978-0-7354-1858-5 , ISSN 0094-243X.
Issue Date: 2019
Publisher: American Institute of Physics Inc.
Document type: konferenční příspěvek
URI: 2-s2.0-85068409180
ISBN: 978-0-7354-1858-5
ISSN: 0094-243X
Keywords: Sekundární proudění druhého druhu, sekundární proudění, proudění kanálem, particle image velocimetry
Keywords in different language: Secondary flow of second kind, secondary flow, channel flow, particle image velocimetry
Abstract: Boundary layer in developing channel flow of air is experimentally studied by using the Stereo Particle Image Velocimetry (PIV) technique. The measurement is performed at fixed distance 400 mm from the channel inlet and the Reynolds number (based on the channel length, i.e. the distance from the boundary layer origin) is controlled via the imposed velocity. Re ranges from 8·104 to 8·105. The displacement boundary layer thickness δ varies from 1.7 to 2.5 mm while the momentum one θ from 0.9 to 1.3 mm. It is found, that the critical Reynolds number of transition to turbulence of the boundary layer is lowered by the vicinity of the other perpendicular wall of the square channel; more accurately - it is accelerated by the larger-scale secondary flow, which results into turbulence at slightly lower Reynolds numbers. The laminar-turbulent transition is first apparent on the profiles of the turbulent kinetic energy, later on the velocity profiles. The mechanism might be probably such, that the turbulent flow structures generated in the secondary flow in the corner via Richardson energy transfer mechanism migrate into the laminar boundary layer. While the large- scale structures cannot feed from the limited-size boundary layer, the smaller ones can strengthen there.
Rights: Plný text není přístupný. Plný text bude přístupný od 27.06.2020.
© American Institute of Physics Inc.
Appears in Collections:Konferenční příspěvky / Conference papers (KKE)

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