Název:	Secondary flow of second kind in a short channel observed by PIV
Autoři:	Duda, Daniel Bém, Jindřich Yanovych, Vitalii Pavlíček, Petr Uruba, Václav
Citace zdrojového dokumentu:	DUDA, D., BÉM, J., YANOVYCH, V., PAVLÍČEK, P., URUBA, V. Secondary flow of second kind in a short channel observed by PIV. European Journal of Mechanics - B/Fluids, 2020, roč. 79, č. January - February 2020, s. 444-453. ISSN 0997-7546.
Datum vydání:	2020
Nakladatel:	Elsevier
Typ dokumentu:	preprint preprint
URI:	2-s2.0-85074360691 http://hdl.handle.net/11025/42745
ISSN:	0997-7546
Klíčová slova v dalším jazyce:	Particle image velocimetry secondary flow secondary flow of second kind Vortex Boundary layer Transition to turbulence Anisotropy
Abstrakt v dalším jazyce:	By using the Stereo Particle Image Velocimetry (PIV) technique we observe the secondary flow of second kind in a corner of a channel of square cross-section. The boundary layer thickness is much lower than the channel size. Therefore, the flow is still developing, not filling the entire channel cross-section, which is the case more widely reported in literature studied in a very long channel. The non-linear secondary effects of interacting boundary layers are observed as a single stream-wise vortex close to the channel corner in case of laminar boundary layers. In the case of turbulent boundary layers, the secondary flow takes shape of a symmetric pair of counter-rotating vortices. This pattern is observable only in the average velocity field, while the instantaneous ones display large amount of vortices, whose spatial distribution close to the corner in dependence on their orientation leads to statistically emergent net vorticity. At the same time, this pattern is reproduced by using a numerical simulation.
Práva:	Plný text není přístupný. © Elsevier
Vyskytuje se v kolekcích:	Preprinty / Preprints (KKE) Preprinty / Preprints (CEV) OBD

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