The control of vortex shedding behind heated circular cylinders at low Reynolds numbers

Lecordier, Jean-Claude; Hamma, L.; Paranthoën, Pierre

doi:10.1007/bf00190392

Cited by 102 publications

(45 citation statements)

References 18 publications

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“…When the cylinder is exposed to a horizontal cross flow, Lecordier et al 9 and Wang et al 10 observed that for a Reynolds number just above the critical value of Re c ϭ49 the vortex shedding could be suppressed by a small amount of heat input to the cylinder in air. Heating the wake flow has an opposite effect in air and water, due to the difference in the thermal dependence of the kinematic viscosity.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the vortex formation process behind a heated cylinder

2004

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This paper describes the three-dimensional (3D) vortex formation process behind a heated cylinder at low Reynolds numbers. Both experimental and numerical techniques are used, including an electrochemical tin-precipitation visualization method, a two-dimensional (2D) high resolution particle velocimetry technique, and a 3D spectral element method. The wake flow is simultaneously investigated in two perpendicular planes using a “dual-plane” configuration. It appears that for Reynolds number around 100 and Richardson number larger than 1.0 thermal plumes occur in the far wake. Correspondingly distinct counterrotating vortices, with a spanwise wavelength of two cylinder diameters, are shown in the near wake. Furthermore, a difference in the flow motion for “in-plume” and “out-of-plume” positions is observed. The vortex shedding process for the “out-of-plume” positions is quite similar to the one for an unheated cylinder, which is a 2D flow. At in-plume positions, it is observed that the flow moves upward from the lower to the upper half of the wake. From the calculated temperature field, a region of unstable thermal stratification in gravity direction is observed at the in-plume positions. This indicates that the upward motion at the in-plume positions is induced by buoyancy when the temperature gradient is large enough.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the vortex formation process behind a heated cylinder

2004

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“…An original construction of the effective Reynolds number assumes that critical effective Reynolds numbers are the same for both unheated and heated cases [14,15,11]. However, the present T eff calculation could not use this approach.…”

Section: Effective Temperature and St-re Eff Relationshipmentioning

confidence: 93%

“…The idea of effective temperature was proposed originally by Lecordier et al [14], and used later by Dumouchel et al [15], who worked out this concept and calculated the effective kinematic viscosity m eff from an effective temperature T eff that is defined by…”

Section: Thermal Effects In Air and Water For Forced Convectionmentioning

confidence: 99%

The influence of temperature gradient on the Strouhal–Reynolds number relationship for water and air

Vít

Ren

Trávníček

et al. 2007

Experimental Thermal and Fluid Science

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“…For a horizontal mounted cylinder, the vortex shedding can be suppressed by heating of the cylinder at Reynolds values just above the critical value: Re c =49 ͑Lecordier et al, 5 Wang et al 6 ͒. In Lecordier et al, 7 the sudden disappearance of the vortex shedding phenomenon is analyzed and it is concluded that the influence of the temperature on the viscosity is the primary source.…”

Section: Introductionmentioning

confidence: 99%

Lift-up process in a heated-cylinder wake flow

2006

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A three-dimensional flow transition behind a heated cylinder is analyzed at low Reynolds numbers: Re=O(100). Both visualizations and numerical simulations show that the transition manifests itself in the form of mushroom-type structures in the far wake and Λ-shaped structures in the near wake. The legs of the Λ-shaped structures coincide with streamwise vorticity regions. An intermediate stage is observed between the Λ-shaped structures and the escaping mushroom-type structures. This intermediate step is characterized by a lift-up process, which takes place in the center region between the legs and head of the Λ-shaped structures. As a result, hot fluid is being pulled out of the upper vortex core. Due to this lift-up process, mushroom-type structures are generated in the form of escaping vortex rings in the far wake.

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The control of vortex shedding behind heated circular cylinders at low Reynolds numbers

Cited by 102 publications

References 18 publications

Experimental and numerical investigation of the vortex formation process behind a heated cylinder

Experimental and numerical investigation of the vortex formation process behind a heated cylinder

The influence of temperature gradient on the Strouhal–Reynolds number relationship for water and air

Lift-up process in a heated-cylinder wake flow

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