Near-wake behavior of a heated circular cylinder: Viscosity-buoyancy duality

Michaux-Leblond, Nathalie; Bélorgey, Michel

doi:10.1016/s0894-1777(97)00046-0

Cited by 32 publications

(10 citation statements)

References 15 publications

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“…Their numerical simulation of the parallel flow arrangement confirmed the findings of Noto et al (1985). Similar results were also reported in the experimental study of Michaux-Leblond & Belorgey (1997), and the dualism between thermal effects and viscous effects was suggested to be responsible for the abrupt disappearance of the wake vortex shedding behind a heated cylinder exposed to a parallel approach flow.…”

Section: Introductionsupporting

confidence: 77%

Thermal effects on the wake of a heated circular cylinder operating in mixed convection regime

Koochesfahani

2011

J. Fluid Mech.

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The thermal effects on the wake flow behind a heated circular cylinder operating in the mixed convection regime were investigated experimentally in the present study. The experiments were conducted in a vertical water channel with the heated cylinder placed horizontally and the flow approaching the cylinder downwards. With such a flow arrangement, the direction of the thermally induced buoyancy force acting on the fluid surrounding the heated cylinder would be opposite to the approach flow. During the experiments, the temperature and Reynolds number of the approach flow were held constant. By adjusting the surface temperature of the heated cylinder, the corresponding Richardson number (Ri = Gr/Re 2 ) was varied between 0.0 (unheated) and 1.04, resulting in a change in the heat transfer process from forced convection to mixed convection. A novel flow diagnostic technique, molecular tagging velocimetry and thermometry (MTV&T), was used for qualitative flow visualization of thermally induced flow structures and quantitative, simultaneous measurements of flow velocity and temperature distributions in the wake of the heated cylinder. With increasing temperature of the heated cylinder (i.e. Richardson number), significant modifications of the wake flow pattern and wake vortex shedding process were clearly revealed. When the Richardson number was relatively small (Ri 0.31), the vortex shedding process in the wake of the heated cylinder was found to be quite similar to that of an unheated cylinder. As the Richardson number increased to ∼0.50, the wake vortex shedding process was found to be 'delayed', with the wake vortex structures beginning to shed much further downstream. As the Richardson number approached unity (Ri 0.72), instead of having 'Kármán' vortices shedding alternately at the two sides of the heated cylinder, concurrent shedding of smaller vortex structures was observed in the near wake of the heated cylinder. The smaller vortex structures were found to behave more like 'Kelvin-Helmholtz' vortices than 'Kármán' vortices, and adjacent small vortices would merge to form larger vortex structures further downstream. It was also found that the shedding frequency of the wake vortex structures decreased with increasing Richardson number. The wake closure length and the drag coefficient of the heated cylinder were found initially to decrease slightly when the Richardson number was relatively small (Ri < 0.31), and then to increase monotonically with increasing Richardson number as the Richardson number became relatively large (Ri > 0.31). The † Email address for correspondence: huhui@iastate.edu 236 H. Hu and M. M. Koochesfahani average Nusselt number (Nu) of the heated cylinder was found to decrease almost linearly with increasing Richardson number.

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Section: Introductionsupporting

confidence: 77%

Thermal effects on the wake of a heated circular cylinder operating in mixed convection regime

Koochesfahani

2011

J. Fluid Mech.

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“…By increasing the temperature the vortex-shedding process can even be suppressed. These results were later experimentally verified in Michaux- Leblond and Bélorgey (1997). However, the effect of heat on the actual vortex for- mation and shedding process are not discussed in these investigations.…”

Section: Introduction and Problem Definitionmentioning

confidence: 88%

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

Kieft

Rindt

Steenhoven

2007

International Journal of Heat and Fluid Flow

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“…Considering the upward flow around a heated cylinder, it turns out that heat stabilises the vortex street characteristics [6][7][8]. First a slight increase in the vortex shedding frequency can be observed but a further increase of heat addition results in the formation of two steady twin vortices.…”

Section: Introduction and Problem Definitionmentioning

confidence: 99%

Heat induced transition of a stable vortex street

Kieft¹,

Rindt²,

Steenhoven³

2002

International Journal of Heat and Mass Transfer

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A combined numerical and experimental investigation is presented showing the effect of heat on the stability of a horizontal vortex street for Re D ¼ 75 and Ri D between 1 and 2. Detailed 2D-HiRes PV experiments are compared with 2D numerical results. The results show that an early transition to 3D of the vortex street takes place for Ri D > 1. Furthermore, the location at which the 2D wake becomes essentially 3D turns out to be dependent on Ri D . For an increasing addition of heat (increasing Ri D ), this location is shifted into the direction of the cylinder. By applying 3D measuring techniques, such as 3D-PTV and 3D visualisation techniques, the transition process and the behaviour downstream of the transition point are investigated. Ó

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Near-wake behavior of a heated circular cylinder: Viscosity-buoyancy duality

Cited by 32 publications

References 15 publications

Thermal effects on the wake of a heated circular cylinder operating in mixed convection regime

Thermal effects on the wake of a heated circular cylinder operating in mixed convection regime

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

Heat induced transition of a stable vortex street

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