A comparison between the separated flow structures near the wake of a bare and a foam-covered circular cylinder

Ashtiani Abdi, Iman, Hooman, Kamel and Khashehchi, Morteza (2014) A comparison between the separated flow structures near the wake of a bare and a foam-covered circular cylinder. Journal of Fluids Engineering, 136 12: 121203-1-121203-8. doi:10.1115/1.4027686


Author Ashtiani Abdi, Iman
Hooman, Kamel
Khashehchi, Morteza
Title A comparison between the separated flow structures near the wake of a bare and a foam-covered circular cylinder
Journal name Journal of Fluids Engineering   Check publisher's open access policy
ISSN 0098-2202
1528-901X
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1115/1.4027686
Volume 136
Issue 12
Start page 121203-1
End page 121203-8
Total pages 8
Place of publication New York, NY, United States
Publisher The American Society of Mechanical Engineers
Collection year 2015
Language eng
Abstract The flow structures behind bare and aluminum foam-covered single circular cylinders were investigated using particle image velocimetry (PIV). The experiments are conducted for a range of Reynolds numbers from 2000 to 8000, based on the outer cylinders diameter and the air velocity upstream of the cylinder. The analysis of the PIV data shows the important effects of the foam cover and the inlet velocity on the separated structures. The results show a considerable increase in the wake size behind a foam-covered cylinder compared to that of a bare cylinder. Furthermore, the turbulence intensity is found to be around 10% higher in the case of the foam-covered cylinder where the wake size is approximately doubled for the former case compared to the latter. The turbulence kinetic energy, however, is found to be less Reynolds dependent in the case of the foam-covered cylinder. In addition, small scale structures contribute to the formation of the flow structures in the foam-covered cylinder making them a more efficient turbulent generator for the next rows when used in a heat exchanger tube bundle. On the other hand, a higher energy level in such separated structures will translate into increased pressure drop compared to bare cylinders. Finally, the results of this study can be used as an accurate set of boundary conditions for modeling the flow field past such cylinders.
Q-Index Code CX
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Mon, 02 Feb 2015, 21:34:19 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering