Modeling Laminar Heat Transfer in a Curved Rectangular Duct with a Computational Fluid Dynamics Code

Facão, Jorge; Oliveira, Armando C.

doi:10.1080/10407780590948918

Cited by 21 publications

(5 citation statements)

References 26 publications

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“…It is one of the most widely used commercial codes for simulating engineering fluid flow and heat transfer problems due to its accuracy, robustness and convenience [18][19][20]. It uses a control-volume-based technique to convert the governing equations to algebraic equations that can be solved numerically.…”

Section: Methodsmentioning

confidence: 99%

A numerical investigation on effects of ceiling and floor surface temperatures and room dimensions on the Nusselt number for a floor heating system

Karadağ

Teke

Bulut

2007

International Communications in Heat and Mass Transfer

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Section: Methodsmentioning

confidence: 99%

A numerical investigation on effects of ceiling and floor surface temperatures and room dimensions on the Nusselt number for a floor heating system

Karadağ

Teke

Bulut

2007

International Communications in Heat and Mass Transfer

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“…A combined numerical and experimental study by Jiang et al [174] for flow through curved rectangular microchannel confirmed chaotic mixing to begin beyond a DN of around 100. The numerical study of Facao and Oliviera [188] revealed up to a ten-fold increase in Nu due to curvature of a rectangular channel along with splitting of the rolling pair to three vortex pairs at DN of 131. Similar investigations by Rosaguti et al [189][190][191] and Geyer et al [192] showed two and half to three times rise in Nu for flow of water through wavy microchannels depending on whether the flow section is circular, semi-circular or square.…”

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 99%

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

2019

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Since the realization of microchannel devices more than three and half decades ago with water as the cooling fluid providing heat transfer enhancement, significant progress has been made to improve the cooling performance. Thermal management for electronic devices with their ever-widening user profile remains the major driving force for performance improvement in terms of miniaturisation, long-term reliability, and ease of maintenance. The ever-increasing requirement of meeting higher heat flux density in more compact and powerful electronic systems calls for further innovative solutions. Some recent studies indicate the promise offered by processes with phase change and the use of active devices. But their adoption for electronic cooling still weighs unfavourably against long-term fluid stability and simplicity of device profile with moderate to high heat transfer capability. Applications and reviews of these promising research trends have been briefly visited in this work. The main focus of this review is the flow and heat transfer regime related to electronic cooling in evolving channel forms, whose fabrication are being enabled by the significant advancement in micro-technologies. Use of disruptive wall structures like ribs, cavities, dimples, protrusions, secondary channels and other interrupts along with smooth-walled channels with curved flow passages remain the two chief geometrical innovations envisaged for these applications. These innovations target higher thermal enhancement factor since this implies more heat transfer capability for the same pumping power in comparison with the corresponding straight-axis, smooth-wall channel configuration. The sophistication necessary to deal with the experimental uncertainties associated with the micron-level characteristic length scale of any microchannel device delayed the availability of results that exhibited acceptable matching with numerical investigations. It is indeed encouraging that the experimental results pertaining to simple smooth channels to grooved, ribbed and curved microchannels without unreasonable increase in pumping power have shown good agreement with conventional numerical analyses based on laminar-flow conjugate heat-transfer model with no-slip boundary condition. The flow mechanism with the different disruptive structures like dimple, cavity and rib, fin and interruption, vortex generator, convergingdiverging side walls or curved axis are reviewed to augment the heat transfer. While the disruptions cause heat transfer enhancement by interrupting the boundary layer growth and promoting mixing by the shed vortices or secondary channel flow, the flow curvature brings in enhancement by the formation of secondary rolls culminating into chaotic advection at higher Reynolds number. Besides these revelations, the numerical studies helped in identifying the parameter ranges, promoting a particular enhancement mechanism. Also, the use of modern tools like Poincare section and the analysis of flow bifurcation leading to chaotic advection is discussed....

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“…Dolon et al [42] calculated heat transfer in the stable and oscillating flow behavior for the non-rotating curved duct of large aspect ratio. Facao and Oliveira [43] used the CFD method and fluent code to manipulate heat transfer in the rectangular duct for several Dean numbers. To the best of the authors' knowledge, the physical phenomena of the negative rotation through a curved duct is yet to understand.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rotation on Transient Fluid Flow and Heat Transfer Through a Curved Square Duct: The Case of Negative Rotation

Hasan

Mollah

Kumar

et al. 2021

International Journal of Applied Mechanics and Engineering

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The fluid flow and heat transfer through a rotating curved duct has received much attention in recent years because of vast applications in mechanical devices. It is noticed that there occur two different types of rotations in a rotating curved duct such as positive and negative rotation. The positive rotation through the curved duct is widely investigated while the investigation on the negative rotation is rarely available. The paper investigates the influence of negative rotation for a wide range of Taylor number (−10 ≤ Tr ≤ −2500) when the duct itself rotates about the center of curvature. Due to the rotation, three types of forces including Coriolis, centrifugal, and buoyancy forces are generated. The study focuses and explains the combined effect of these forces on the fluid flow in details. First, the linear stability of the steady solution is performed. An unsteady solution is then obtained by time-evolution calculation and flow transition is determined by calculating phase space and power spectrum. When Tr is raised in the negative direction, the flow behavior shows different flow instabilities including steady-state, periodic, multi-periodic, and chaotic oscillations. Furthermore, the pattern variations of axial and secondary flow velocity and isotherms are obtained, and it is found that there is a strong interaction between the flow velocities and the isotherms. Then temperature gradients are calculated which show that the fluid mixing and the acts of secondary flow have a strong influence on heat transfer in the fluid. Diagrams of unsteady flow and vortex structure are further sketched and precisely elucidate the curvature effects on unsteady fluid flow. Finally, a comparison between the numerical and experimental data is discussed which demonstrates that both data coincide with each other.

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Modeling Laminar Heat Transfer in a Curved Rectangular Duct with a Computational Fluid Dynamics Code

Cited by 21 publications

References 26 publications

A numerical investigation on effects of ceiling and floor surface temperatures and room dimensions on the Nusselt number for a floor heating system

A numerical investigation on effects of ceiling and floor surface temperatures and room dimensions on the Nusselt number for a floor heating system

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

Effects of Rotation on Transient Fluid Flow and Heat Transfer Through a Curved Square Duct: The Case of Negative Rotation

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