Numerical investigation of heat transfer characteristics of the heated blocks in the channel with a transversely oscillating cylinder

Fu, Wu‐Shung; Tong, Baohong

doi:10.1016/s0017-9310(03)00303-x

Cited by 57 publications

(26 citation statements)

References 22 publications

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“…Compared with an external flow past a circular cylinder, the flow around a circular cylinder confined in a channel is quite complicated because of interaction of the vortices shed from the cylinder with the shear layers formed on the channel walls [2,18]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Heat transfer enhancement in a straight channel via a rotationally oscillating adiabatic cylinder

Beşkök

Raisee

Çelik

et al. 2012

International Journal of Thermal Sciences

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Lock-in regime Time periodic flow and heat transfer a b s t r a c t Heat convection from the uniformly heated walls of a straight channel in presence of a rotationally oscillating cylinder (ROC) is simulated at Re ¼ 100. Heat transfer enhancement due to vortex shedding from the ROC is investigated. Systematic studies are performed to explore the rotation angle and frequency influences on heat transfer by varying the latter in range of the lock-in regime and the former from 0 to 2p/3. All simulation results are based on the numerical solutions of two-dimensional, unsteady, incompressible NaviereStokes and energy equations using an h/p type finite element algorithm. Considering time periodicity of the resulting flow and temperature fields, time averaged wall Nusselt number is reported to quantify the heat transfer enhancement for Pr ¼ 0.1, 1.0, 5.0 and 10.0 fluids. Performance analyses of the ROC device based on its total power consumption and heat transfer enhancement are also presented.

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Section: Resultsmentioning

confidence: 99%

Heat transfer enhancement in a straight channel via a rotationally oscillating adiabatic cylinder

Beşkök

Raisee

Çelik

et al. 2012

International Journal of Thermal Sciences

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“…On top of that, the fact that additional power and some sort of variable-frequency pump was required takes away from the practicality of such strategy. Some researchers used oscillating objects, such as plates and cylinder, within the channel to help break the eddies formed between heated blocks [9,10]. The same dependence on frequency was observed but with much better heat transfer than when the flow itself is oscillated.…”

Section: Introductionmentioning

confidence: 86%

Enhancement of conjugate heat transfer from electronic chips with a rotating tri-vane assembly

Bourisli

2010

WIT Transactions on Engineering Sciences

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The enhancement of heat transfer from heat-dissipating devices is investigated. The laminar convection-conduction heat transfer from five heat-generating block in a channel at different Reynolds numbers is numerically simulated using the finite volume method. Newly proposed tri-vane structures with constant angular velocities are placed near the upper downstream corners of the blocks. The vanes in the structures drive significant portions of the core channel flow into the dead zones between the blocks. An optimum angular velocity for the structure is shown to exist, giving a reduction in maximum temperature of 16.3% at Re = 1000. The location of the optimum angular velocity was shown to bifurcate because of the influence of the natural frequency of the structure. It is concluded that this effect can have a positive effect on the overall heat transfer from the blocks.

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“…The development of the physical properties of the flow at early times is captured and used to explain observed changes in flow quantities such as lift and drag coefficients. Fu and Tong [8] and Ghazanfarian and Nobari [9] also showed that heat transfer from any downstream heated blocks can also benefit greatly from that optimum oscillation frequency of the cylinder.…”

Section: Introductionmentioning

confidence: 97%

Passive Drag Reduction Techniques for Modulating the Effects of Vortex Shedding

Bourisli¹

2014

IJMMM

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Abstract-Over a wide range of Reynolds numbers, the phenomenon of vortex shedding and the associated fluctuations in drag and lift, and the possible vibration in the structure, can be a formidable problem in many applications. Attempts have been made to control, reduce, or altogether eliminate these vortex-induced fluctuations in flow properties. In this study, unsteady laminar flow around a circular cylinder is numerically simulated using the finite volume method. The passive technique of introducing simple slits at specified locations around the cylinder for the purpose of modulating the effect of vortex shedding is investigated. It was found that at a Reynolds number of 1000 the reduction in the coefficient of drag is over 14%, which decreases in Nusselt number, and thus the total heat transfer from the cylinder, of 15.5% and 4.44%, respectively. Physical insight is given to explain the source of the phenomenon, and the advantages of applying such passive techniques to control free flows are discussed.

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Numerical investigation of heat transfer characteristics of the heated blocks in the channel with a transversely oscillating cylinder

Cited by 57 publications

References 22 publications

Heat transfer enhancement in a straight channel via a rotationally oscillating adiabatic cylinder

Heat transfer enhancement in a straight channel via a rotationally oscillating adiabatic cylinder

Enhancement of conjugate heat transfer from electronic chips with a rotating tri-vane assembly

Passive Drag Reduction Techniques for Modulating the Effects of Vortex Shedding

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