| Issue |
Mechanics & Industry
Volume 22, 2021
Application of Experimental and Numerical Methods in Fluid Mechanics and Energy
|
|
|---|---|---|
| Article Number | 25 | |
| Number of page(s) | 14 | |
| DOI | https://doi.org/10.1051/meca/2021014 | |
| Published online | 09 April 2021 | |
Regular Article
Dynamics of flow in a branching channel
1
Institute of Thermomechanics of the Czech Academy of Sciences, Dolejškova 5, Praha 8, Czech Republic
2
UWB, Faculty of Mech. Eng., Depart. of Power System Engineering, Universitní 8, Plzeň, Czech Republic
* e-mail: uruba@it.cas.cz
Received:
29
March
2019
Accepted:
12
February
2021
Flow in a branched channel is studied experimentally using the PIV technique. The presented study is concentrated on clarifying the dynamical behaviour in individual branches. The 11 branches issuing from the main channel perpendicularly, all channels are of rectangular cross-section. First, the time-mean flow-field is shown, then the flow dynamics is investigated using the OPD method. Flow patterns and frequencies are evaluated in three selected branches. The separated flow in branches exhibits highly dynamical behaviour, which differs substantially in the branches close to the inflow, in the main channel middle and close to its end. The typical topologies and frequencies of the detected quasi-periodical structures in the channel braches are shown in the study. Mostly, the flow-fields are populated by trains of vortices with alternating orientation and saddle-like structures. The flow-field close to the channel walls affects heat transfer process between the wall and fluid.
Key words: Branching channel / turbulence / dynamics / OPD
© V. Uruba et al., published by EDP Sciences 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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