Characteristics of the wake behind a heated cylinder in relatively high Reynolds number

Khashehchi, Morteza, Abdi, Iman Ashtiani and Hooman, Kamel (2015) Characteristics of the wake behind a heated cylinder in relatively high Reynolds number. International Journal of Heat and Mass Transfer, 86 589-599. doi:10.1016/j.ijheatmasstransfer.2015.03.053

Author Khashehchi, Morteza
Abdi, Iman Ashtiani
Hooman, Kamel
Title Characteristics of the wake behind a heated cylinder in relatively high Reynolds number
Journal name International Journal of Heat and Mass Transfer   Check publisher's open access policy
ISSN 0017-9310
Publication date 2015-07-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.ijheatmasstransfer.2015.03.053
Open Access Status Not Open Access
Volume 86
Start page 589
End page 599
Total pages 11
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Language eng
Abstract Thermal effects on the dynamics and stability of the flow past a circular cylinder operating in the forced convection regime is studied experimentally for Reynolds numbers (Red) between 1000 and 4000, and different cylinder wall temperatures (Tw) between 25 and 75 °C by means of Particle Image Velocimetry (PIV). In each experiment, to acquire 3000 PIV image pairs, the temperature and Reynolds number of the approach flow were held constant. By adjusting different temperatures in different Reynolds numbers, the corresponding Richardson number was varied between 0.0 and 0.2. With increasing temperature of the wall cylinder, significant modifications of the wake flow pattern and wake vortex shedding process were clearly revealed. By increasing the Richardson number, the high temperature gradient in the wake shear layer creates a type of vorticity with opposite sign to that of the shear layer vorticity. This temperature gradient-vorticity weakens the strength of the shear layer vorticity, causing delay in reaching the recreation point. In addition to the wake characteristics, it is found that, as the Richardson number is increased, the organization of the vortex shedding is altered and the relative position of the first detached vortices with respect to the second one is changed. This change varies the frequency of the shedding process.
Keyword Planar-PIV
Conditional averaging
Low speed air flow
Circular cylinder
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 2016 Collection
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