A comparison between the wake behind finned and foamed circular cylinders in cross-flow

Khashehchi, M., Ashtiani Abdi, I., Hooman, K. and Roesgen, T. (2014) A comparison between the wake behind finned and foamed circular cylinders in cross-flow. Experimental Thermal and Fluid Science, 52 328-338. doi:10.1016/j.expthermflusci.2013.10.008

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Author Khashehchi, M.
Ashtiani Abdi, I.
Hooman, K.
Roesgen, T.
Title A comparison between the wake behind finned and foamed circular cylinders in cross-flow
Journal name Experimental Thermal and Fluid Science   Check publisher's open access policy
ISSN 0894-1777
1879-2286
Publication date 2014-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.expthermflusci.2013.10.008
Open Access Status
Volume 52
Start page 328
End page 338
Total pages 11
Place of publication Philadelphia, PA, United States
Publisher Elsevier
Collection year 2014
Language eng
Abstract The flow pattern behind a circular cylinder is associated with various instabilities. These instabilities are characterized by the Reynolds number and include the wake, separated shear layer and boundary layer. Depending on the physical application of the cylinder, increasing the level of turbulence on the surface of the cylinder would be a target for drag reduction or heat transfer enhancement. Particle Image Velocimetry (PIV) has been carried out to investigate the wake region behind a foamed and a finned cylinder. The purpose of this analysis is to investigate the flow characteristics for these two cases. The experiments are conducted for a wide range of Reynolds numbers (based on the mean air velocity and the cylinder diameter) from 1000 to 10,000. Two dimensional results of planar PIV reveal the important aspects of the local flow features of the circular finned and foamed cylinders. These include turbulent boundary layer development over the surface and a delayed separation of the flow resulting in a smaller wake size at each speed. The application of Proper Orthogonal Decomposition (POD) to the PIV velocity fields of the two cylinder types is also discussed. The POD computed for the measured velocity fields for all cases shows that the first two spatial modes contain most of the kinetic energy of the flow, irrespective to the cylinder type. These two modes are also responsible for the large-scale coherence of the fluctuations. For three different cylinder types, the first four eigenmodes of the flow field were calculated and their structures were analyzed.
Keyword Fluid dynamics
Low speed air flow
Finned and foamed tubes
Planar-PIV
Turbulence
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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Created: Mon, 17 Mar 2014, 10:22:28 EST by Alex Fitzgerald on behalf of School of Mechanical and Mining Engineering