Flow structures in a swirl flow - vortex breakdown condition
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F18%3A43954225" target="_blank" >RIV/49777513:23640/18:43954225 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11025/34730" target="_blank" >http://hdl.handle.net/11025/34730</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1742-6596/1045/1/012031" target="_blank" >10.1088/1742-6596/1045/1/012031</a>
Alternative languages
Result language
angličtina
Original language name
Flow structures in a swirl flow - vortex breakdown condition
Original language description
This paper presents an experimental and numerical analysis of swirl flow in a circular tube. Swirl flow is important for technical and natural processes, where high heat transfer and good fluid mixing are needed. Flow and vortex structures respecting redistribution of momentum and possible occurrence of vortex breakdown are taken into account. The swirl flow is analysed experimentally by the measurement of the velocity field using Particle Image Velocimetry (PIV) and numerically via the commercial CFD code ANSYS CFX. Three cases are investigated: laminar flow regime (Re = 1,000), intermediate flow regime (Re = 2,000), and turbulent flow regime (Re = 5,000). The redistribution of the velocity field and the decrease of the swirl strength towards the outlet are shown. This redistribution affects the Reynolds number. Concerning the Rossby number, the occurrence of vortex breakdown in the swirl flow is determined. It is shown that the vortex breakdown takes place in the flow with higher Reynolds numbers, where an axial backflow may occur. Changes of the Reynolds numbers Re_phi and Re_z along the tube length also confirm this statement. Furthermore, a thermodynamic perspective of vortex breakdown phenomena is presented.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20303 - Thermodynamics
Result continuities
Project
<a href="/en/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Journal of Physics: Conference Series
ISBN
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ISSN
1742-6588
e-ISSN
1742-6596
Number of pages
9
Pages from-to
"NESTRÁNKOVÁNO"
Publisher name
IOP Publishing Ltd.
Place of publication
Bristol, UK
Event location
Miskolc-Lillafüred, Maďarsko
Event date
Oct 2, 2017
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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