Direct Numerical Simulation of the turbulent wake behind a heated cylinder

Boirlaud, Matthieu; Couton, D.; Plourde, Frédéric

doi:10.1016/j.ijheatfluidflow.2012.09.005

Cited by 12 publications

(11 citation statements)

References 32 publications

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“…Furthermore, results in Fig. 5a are in good agreement with those of Boirlaud et al [20] where increasing the Richardson number delays reaching the minimum velocity inside the recirculation region. Note that, data presented in Fig.…”

Section: Thermal Effects On the Flow Statisticssupporting

confidence: 89%

“…It can be seen that the effects of the heat on the mean streamwise velocity is on both the strength of the minimum velocity structure and the location of the stagnation point. Interestingly, Boirland et al [20] observed the elongation of the bubble size in the case of a heated cylinder in a mixed convection regime at Re d = 1000. However, for the mentioned regime a dissenting effect on the magnitude of the minimum value has been also observed, as the increasing of the surface temperature raises this value.…”

Section: Thermal Effects On the Flow Statisticsmentioning

confidence: 99%

“…For instance, according to [17,18], below a critical heat flux, shedding frequency is increased compared to unheated cylinder case for a vertically upward flow past a horizontal cylinder (assisting flow). The behavior of vortex structures shed from a heated cylinder were numerically and experimentally investigated by Kieft et al [19] and Boirlaud et al [20]. In the former, the forced and mixed convection has been studied while in the latter study, mixed convection has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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

Khashehchi

Abdi

Hooman

2015

International Journal of Heat and Mass Transfer

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Section: Thermal Effects On the Flow Statisticssupporting

confidence: 89%

Section: Thermal Effects On the Flow Statisticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Khashehchi

Abdi

Hooman

2015

International Journal of Heat and Mass Transfer

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“…In the former, the forced and mixed convection has been studied while in the latter study, mixed convection has been investigated. Kieft et al [215] . Surprisingly, the detached vortices were found to move down slightly; a rather unexpected behaviour considering the upward buoyancy force.…”

Section: Introductionmentioning

confidence: 99%

“…[210] and Park et al [211]); yet limited to Re ∼ 700. As described by (Incropera Kieft et al [215] and Boirlaud et al [216]. In the former, the forced and mixed convection has been studied while in the latter study, mixed convection has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Wake behind a rough (metal foam-covered) cylinder in cross-flow

Abdi¹

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The flow structures behind a circular cylinder are associated with various instabilities. These instabilities are characterized by the Reynolds number and they include the wake, separated shear layer and boundary layer. Depending on the physical application of the cylinder, increasing the level of turbulence by wrapping the cylinder with metal foam would be a target for drag reduction or heat transfer enhancement.In contrast to the extensive consideration that has been devoted to the flow around bare cylinders, the flow structures around the foam-covered cylinders and the characteristics of the wake behind such surfaces has received relatively little attention. Since the present study explores the possibility of using metal foams as replacements for fins on heat exchanger tubes, investigation on the flow-field structures downstream of a foam-covered cylinder and compare it to the bare cylinder specifies the feasibility of using the foamcovered cylinders in heat exchangers. Moreover, the outcome of this study can be used to develop an appropriate boundary condition for the porous-air interface modelling also increases the knowledge of turbulence in porous media.As it will be discussed more in detail in the following chapters, pressure drop and drag coefficient are directly linked to the wake and recirculation region, and to study these two phenomena, it is necessary to have in depth study on the flow-field down-stream of the cylinder. Hence, the purpose of this study is to investigate the wake region behind a foam- Moreover, using hot-wire anemometry, to investigate the energy of the flow inside and outside of the foam-covered cylinder's wake, let us know if a foam-covered cylinder can be treated as an obstacle to the incident flow with a rough surface or the whole foam can be considered as the combination of local jets that are coming out of the pores and disperse in random directions.III

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