Near wake effects of a heat input on the vortex shedding mechanism

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Abstract

This article presents the investigation on the vortex formation and shedding process behind a heated cylinder which is exposed to a cold cross flow. The Reynolds number is chosen to be 75 while the Grashof number is varied between 0 and 5000 (resulting in a variation from forced to mixed convection). The numerical results show that the addition of heat disturbs the vortex formation process. The vortices shed from the upper half of the cylinder become stronger for increasing heat input. Therefore, the shedding process at the upper half of the cylinder becomes more effective compared with the process at the lower half. Consequently, the vortices shed from the upper half of the cylinder have a higher vorticity extreme and a higher temperature. The results show that the difference in effectiveness is mainly caused by a decreasing effect of strain rate during the formation of an upper vortex. This change in strain rate is caused by a change in flow pattern around the cylinder for increasing Grashof number. For higher heat input more fluid flows underneath the cylinder, resulting in weaker shear layers at the upper part of the cylinder.
Original languageEnglish
Pages (from-to)938-947
JournalInternational Journal of Heat and Fluid Flow
Volume28
Issue number5
DOIs
Publication statusPublished - 2007

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near wakes
vortex shedding
Vortex shedding
Vortex flow
heat
Grashof number
vortices
Strain rate
strain rate
Mixed convection
Vorticity
Flow patterns
Flow of fluids
cross flow
Reynolds number
shear layers
Hot Temperature
vorticity
fluid flow
flow distribution

Cite this

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title = "Near wake effects of a heat input on the vortex shedding mechanism",
abstract = "This article presents the investigation on the vortex formation and shedding process behind a heated cylinder which is exposed to a cold cross flow. The Reynolds number is chosen to be 75 while the Grashof number is varied between 0 and 5000 (resulting in a variation from forced to mixed convection). The numerical results show that the addition of heat disturbs the vortex formation process. The vortices shed from the upper half of the cylinder become stronger for increasing heat input. Therefore, the shedding process at the upper half of the cylinder becomes more effective compared with the process at the lower half. Consequently, the vortices shed from the upper half of the cylinder have a higher vorticity extreme and a higher temperature. The results show that the difference in effectiveness is mainly caused by a decreasing effect of strain rate during the formation of an upper vortex. This change in strain rate is caused by a change in flow pattern around the cylinder for increasing Grashof number. For higher heat input more fluid flows underneath the cylinder, resulting in weaker shear layers at the upper part of the cylinder.",
author = "R.N. Kieft and C.C.M. Rindt and {Steenhoven, van}, A.A.",
year = "2007",
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language = "English",
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Near wake effects of a heat input on the vortex shedding mechanism. / Kieft, R.N.; Rindt, C.C.M.; Steenhoven, van, A.A.

In: International Journal of Heat and Fluid Flow, Vol. 28, No. 5, 2007, p. 938-947.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Near wake effects of a heat input on the vortex shedding mechanism

AU - Kieft, R.N.

AU - Rindt, C.C.M.

AU - Steenhoven, van, A.A.

PY - 2007

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N2 - This article presents the investigation on the vortex formation and shedding process behind a heated cylinder which is exposed to a cold cross flow. The Reynolds number is chosen to be 75 while the Grashof number is varied between 0 and 5000 (resulting in a variation from forced to mixed convection). The numerical results show that the addition of heat disturbs the vortex formation process. The vortices shed from the upper half of the cylinder become stronger for increasing heat input. Therefore, the shedding process at the upper half of the cylinder becomes more effective compared with the process at the lower half. Consequently, the vortices shed from the upper half of the cylinder have a higher vorticity extreme and a higher temperature. The results show that the difference in effectiveness is mainly caused by a decreasing effect of strain rate during the formation of an upper vortex. This change in strain rate is caused by a change in flow pattern around the cylinder for increasing Grashof number. For higher heat input more fluid flows underneath the cylinder, resulting in weaker shear layers at the upper part of the cylinder.

AB - This article presents the investigation on the vortex formation and shedding process behind a heated cylinder which is exposed to a cold cross flow. The Reynolds number is chosen to be 75 while the Grashof number is varied between 0 and 5000 (resulting in a variation from forced to mixed convection). The numerical results show that the addition of heat disturbs the vortex formation process. The vortices shed from the upper half of the cylinder become stronger for increasing heat input. Therefore, the shedding process at the upper half of the cylinder becomes more effective compared with the process at the lower half. Consequently, the vortices shed from the upper half of the cylinder have a higher vorticity extreme and a higher temperature. The results show that the difference in effectiveness is mainly caused by a decreasing effect of strain rate during the formation of an upper vortex. This change in strain rate is caused by a change in flow pattern around the cylinder for increasing Grashof number. For higher heat input more fluid flows underneath the cylinder, resulting in weaker shear layers at the upper part of the cylinder.

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DO - 10.1016/j.ijheatfluidflow.2007.03.002

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JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

SN - 0142-727X

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