PIV measurement of separated flow in a square channel with streamwise periodic ribs on one wall
(2007) In Journal of Fluids Engineering 129(7). p.834-841- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/586468
- author
- Wang, Lei LU ; Hejcik, J. and Sundén, Bengt LU
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- PIV, turbulence properties, separated flow
- in
- Journal of Fluids Engineering
- volume
- 129
- issue
- 7
- pages
- 834 - 841
- publisher
- American Society Of Mechanical Engineers (ASME)
- external identifiers
-
- wos:000248070900003
- scopus:34547652821
- ISSN
- 0098-2202
- DOI
- 10.1115/1.2742723
- language
- English
- LU publication?
- yes
- id
- 6ba96262-cf5f-44d5-88a5-52039e27ccfb (old id 586468)
- date added to LUP
- 2016-04-04 09:36:22
- date last changed
- 2022-03-23 06:19:46
@article{6ba96262-cf5f-44d5-88a5-52039e27ccfb, abstract = {{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.}}, author = {{Wang, Lei and Hejcik, J. and Sundén, Bengt}}, issn = {{0098-2202}}, keywords = {{PIV; turbulence properties; separated flow}}, language = {{eng}}, number = {{7}}, pages = {{834--841}}, publisher = {{American Society Of Mechanical Engineers (ASME)}}, series = {{Journal of Fluids Engineering}}, title = {{PIV measurement of separated flow in a square channel with streamwise periodic ribs on one wall}}, url = {{http://dx.doi.org/10.1115/1.2742723}}, doi = {{10.1115/1.2742723}}, volume = {{129}}, year = {{2007}}, }