Combined effect of grid turbulence and unsteady wake on convective heat transfer around a heated cylinder

Huang, C.K.; Cheng, Yu-Jen; Kang, Ying

doi:10.1016/j.icheatmasstransfer.2007.05.001

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…This is important for example in the aerodynamic design of high-performance vehicles, because turbulent flow characteristics of the outlets of cooling ducts strongly affect the behaviour of all aerodynamics devices placed downstream the heat exchanger. More in general turbulent wakes can affect fluid flow and heat transfer performances of many technical devices [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of turbulence in the wake of a metal foam

Corsini

Stalio

2020

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of turbulence in the wake of a metal foam

Corsini

Stalio

2020

International Communications in Heat and Mass Transfer

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“…swirl effect, which could enhance the heat transfer performance as well as high CHF performance. In the heat transfer enhancement studies, most studies focused the influence of turbulent intensity on heat transfer coefficient and pressure drop [15][16][17]. The studies showed that an increase of turbulent intensity makes to an increase of the Nusselt number; the heat transfer coefficient could be increased.…”

Section: Resultsmentioning

confidence: 99%

Swirling performance of flow-driven rotating mixing vane toward critical heat flux enhancement

Seo

Park

Seo

et al. 2015

International Journal of Heat and Mass Transfer

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“…For isothermal and heated wakes, previous studies are shown to [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], where studies [19,24] are relevant to studies [1, 2]. The study [24] regards characteristics, e.g., analogies, averaging the whole wake as important.…”

Section: Previous Studies On Heated Wakementioning

confidence: 99%

Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State. Part I: Cylinder Heating Effect on Strong Turbulence Anisotropy (STA), and Determination of STA Suppression

Noto

2014

Numerical Heat Transfer, Part B: Fundamentals

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A variation of strong turbulence anisotropy (STA) with cylinder heating, and, as a result, STA suppression, are here first elucidated in the air heated wake in the transitional state at Reynolds number Re ¼ 300 and Richardson number Ri ¼ 0.3. Simultaneously, new facts for variations of velocities u, v, and w, i.e., the upward, horizontal, and spanwise directions, and wake motion by cylinder heating are first elucidated. Here STA is defined such that, in velocities u, v, and w, laminar velocities arise in at least one directions but turbulence arises in the remainder of directions.1. STA is determined to arise in isothermal and heated wakes by employing the new method. With cylinder heating, STA is found to be suppressed because the turbulent region in w is decreased, the three-dimensionality is suppressed, but the twodimensionality and laminarization are enhanced in the heated wake. 2. With cylinder heating, the spanwise velocity jwj is found to be suppressed strongly in the probability density function (PDF), whose peak value is decreased strongly near w % 0, and becomes 20% of that in the isothermal wake. 3. The above decrease in jwj is found to be equivalent to the increase of laminar state in time records. With cylinder heating, the laminar region is increased, but the region with turbulence is decreased. 4. The wake stability is extremely different in thermal flows with or without turbulence in w. When w has turbulence, here u and v are laminar, STA arises, and the thermal flow field becomes the transitional state, has instability, and is destabilized. 5. When w does not have turbulence, and is laminar, velocities u, v, and w are all laminar, form only 3-D flow, and do not have turbulence anisotropy. The wake does not have instability, and is stabilized.

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Combined effect of grid turbulence and unsteady wake on convective heat transfer around a heated cylinder

Cited by 14 publications

References 12 publications

Direct numerical simulation of turbulence in the wake of a metal foam

Direct numerical simulation of turbulence in the wake of a metal foam

Swirling performance of flow-driven rotating mixing vane toward critical heat flux enhancement

Direct Numerical Simulation of Air Heated Cylinder Wake in Transitional State. Part I: Cylinder Heating Effect on Strong Turbulence Anisotropy (STA), and Determination of STA Suppression

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