Secondary flow of second kind in a short channel observed by PIV

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F20%3A43957446" target="_blank" >RIV/49777513:23210/20:43957446 - isvavai.cz</a>
Alternative codes found
RIV/61388998:_____/19:00517246 RIV/61388998:_____/20:00517246
Result on the web
<a href="https://doi.org/10.1016/j.euromechflu.2019.10.005" target="_blank" >https://doi.org/10.1016/j.euromechflu.2019.10.005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.euromechflu.2019.10.005" target="_blank" >10.1016/j.euromechflu.2019.10.005</a>

Result language
angličtina
Original language name
Secondary flow of second kind in a short channel observed by PIV
Original language description
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.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/EF16_026%2F0008389" target="_blank" >EF16_026/0008389: Research Cooperation for Higher Efficiency and Reliability of Blade Machines</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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