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HEJČÍK, J. SUNDÉN, B. WANG, L.
Originální název
PIV Measurement of Separated Flow in a Square Channel With Streamwise Periodic Ribs on One Wall
Typ
článek v časopise - ostatní, Jost
Jazyk
angličtina
Originální abstrakt
In this study, particle image velocimetry (PIV) is used to investigate the physical process of separated flow in a square channel roughened with periodically transverse ribs on one wall. The ribs obstruct the channel by 15% of its height and are arranged 12 rib heights apart. The Reynolds number, based on the bulk-mean velocity and the corresponding hydraulic diameter of the channel, is fixed at 22,000. Assuming flow periodicity in the streamwise direction, the investigated domain is between two consecutive ribs. The emphasis of this study is to give some insight into the turbulence mechanism associated with separation, reattachment, and subsequent redevelopment. Results are included for mean velocity, friction coefficient, vorticity thickness, Reynolds shear stress, anisotropy parameter, and production of turbulent kinetic energy and shear stress. Based on the two-point correlation profiles, Taylor microscales are derived to reveal the sizes of the turbulence structure in the longitudinal and lateral directions. Moreover, Galilean decomposition is applied to the instantaneous velocity fields. The result shows that the separated shear layer is dominated by the large-scale, unsteady vortical structures.
Klíčová slova
Separated Flow, Turbulence Properties, PIV
Autoři
HEJČÍK, J.; SUNDÉN, B.; WANG, L.
Rok RIV
2007
Vydáno
1. 7. 2007
Nakladatel
ASME
Místo
ASME Technical Publishing Office Three Park Avenue New York NY 10016
ISSN
0098-2202
Periodikum
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
Ročník
129
Číslo
7
Stát
Spojené státy americké
Strany od
834
Strany do
841
Strany počet
8
BibTex
@article{BUT44808, author="Jiří {Hejčík} and Bengt {Sundén} and Lei {Wang}", title="PIV Measurement of Separated Flow in a Square Channel With Streamwise Periodic Ribs on One Wall", journal="JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME", year="2007", volume="129", number="7", pages="8", issn="0098-2202" }