Analysis of the convective heat transfer and flow behavior around two counter‐rotating side‐by‐side cylinders

Darvishyadegari, Mohsen; Hassanzadeh, Rahim

doi:10.1002/htj.21345

Cited by 13 publications

(5 citation statements)

References 43 publications

(43 reference statements)

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“…Typical assumptions such as the laminar, incompressible flow of Newtonian fluid with constant properties are applied. [34][35][36][37] All the parameters in equations ( 1) to (3) are dimensionless. The scaling parameter for velocity u…”

Section: Numerical Analysismentioning

confidence: 99%

“…Typical assumptions such as the laminar, incompressible flow of Newtonian fluid with constant properties are applied. 34–37 …”

Section: Numerical Analysismentioning

confidence: 99%

“…The forced convection heat transfer over co-rotating/counter-rotating cylinders arranged in tandem or side-by-side configurations are analyzed in. [34][35][36][37] For the co-rotating cylinders in the side-by-side arrangement, the wake zones behind the cylinders are impaired and the vortex strength of the bottom cylinder against the rotation is stronger than the top cylinder. Additionally, a negative lift force is developed on both the cylinders.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the thermo-fluidic transport around counter-rotating tandem circular cylinders

Chatterjee

Chaitanya

Mondal

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The work physically relates to the influence of thermal buoyancy on the flow and heat transfer of an incompressible fluid around two counter-rotating circular cylinders arranged in tandem configuration within an unconfined domain. Two-dimensional numerical simulations are conducted using a finite volume based computational fluid dynamics tool to explore the problem. The Reynolds number is taken as 100 with Prandtl number 0.71, keeping the non-dimensional spacing between the cylinders fixed at 1.5. The cylinder rotations are considered in the range of a dimensionless speed of 0 to 5. The upstream cylinder is rotating in the clockwise sense, whereas, the downstream one in the counter-clockwise sense. The buoyancy effect is analyzed for the Richardson number range 0 to 1. The flow is unsteady periodic characterized by vortex shedding around the stationary cylinders at the chosen value of the Reynolds number. The flow shows unsteadiness with vortex shedding initially with increasing rotational speed; however, at a critical value of the rotation, the flow becomes stabilized with suppression of vortex shedding. On the contrary, the cross thermal buoyancy effect destabilizes the flow into an unsteady periodic pattern. This complex interplay among the free stream flow, cross buoyancy, and counter-rotation produces intriguing fluid dynamic and thermal phenomena. The critical rotational speeds for the range of Richardson numbers are obtained as [Formula: see text] respectively for Ri = 0, 0.25, 0.5 and 1. A corresponding regime diagram is also constructed to depict the unsteady and steady zones of operation.

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Section: Numerical Analysismentioning

confidence: 99%

“…Typical assumptions such as the laminar, incompressible flow of Newtonian fluid with constant properties are applied. 34–37 …”

Section: Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the thermo-fluidic transport around counter-rotating tandem circular cylinders

Chatterjee

Chaitanya

Mondal

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…It is noted that the thermal features of the heat transfer between the cylinder and its cavity lie in accordance with the value of the Ra and cylinder location. Convection in two opposite rotating cylinders is analysed by Darvishyadegari and Hassanzadeh . Authors proposed that vortex shedding process and flow structure is heavily affected by the rotating speed of cylinders and gap spaces between them.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of mixed convective heat transfer in a lid‐driven enclosure with rotating cylinders

Dalvi

Bali

Nayka

et al. 2019

Heat Trans. Asian Res.

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A numerical simulation is performed to characterize the mixed convective transport in a three‐dimensional square lid‐driven enclosure with two rotating cylinders. The top wall is moving in the positive x‐direction, and the bottom wall is at a higher fixed temperature compared with all other isothermal walls. Both cylinders are rotating in its own plane about their centroidal axis. On the basis of rotation of both cylinders in clockwise or counter‐clockwise directions, four rotational models are studied. Various controlling parameters considered in the present study are Grashof number (10 3 < Gr < 10 5), rotating speed of the cylinder (5 < ω < 50), and the Reynolds number based on top wall movement is fixed to 100. The effect of cylinder rotation on the heat transfer of bottom wall is reported with the help of streamlines, contour plots of z‐component of vorticity, averaged and local Nusselt number, ratios of secondary flow and drag coefficient. It is observed that the heat transfer at the bottom wall is substantially dependent on the rotational model and rotational speed of the cylinder.

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“…In another work by the same authors [29] regarding the heat and fluid flow around two co-rotating tandem cylinders, it has been demonstrated that a uniform Nusselt number distribution can be observed on both cylinders regardless of the gap space between them. Analysis of convective heat transfer and flow nature around two counter-rotating side-by-side cylinders is the subject of a research work performed by Darvishyadegari and Hassanzadeh [30]. They examined several gap spaces and rotating speeds at constant Reynolds number of 200.…”

Section: Introductionmentioning

confidence: 99%

Analysis of heat and fluid flow around two co-rotating side-by-side cylinders

Hassanzadeh

Darvishyadegari

2019

Sādhanā

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Analysis of the heat and fluid flow around two co-rotating side-by-side cylinders is the subject of this numerical study which is done at constant Reynolds and Prandtl numbers of 200 and 7.0, respectively. Both cylinders rotate in the counterclockwise direction with an identical rotating speed (RS) in the range from 0 to 4. On the other hand, several gap spaces between the rotating cylinders such as G/D = 1.5, 2.0, and 3.0 are considered in the present study. The obtained results are validated against the available data in the open literature. Many different results have been reported in this investigation. It is observed that co-rotating the cylinders deforms the wake region downstream of both cylinders which the vortex strength of the lower cylinder against the rotation is stronger than that of the upper cylinder. On the other hand, co-rotating the cylinders develops a negative lift force on both cylinders. Finally, it was concluded that rotating the side-by-side cylinders reduces the heat transfer rate between the fluid flow and cylinders in general. At whole RS and G/D values, the heat transfer rate of the upper cylinder is realized to be less than that of the lower cylinder. adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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Analysis of the convective heat transfer and flow behavior around two counter‐rotating side‐by‐side cylinders

Cited by 13 publications

References 43 publications

Analysis of the thermo-fluidic transport around counter-rotating tandem circular cylinders

Analysis of the thermo-fluidic transport around counter-rotating tandem circular cylinders

Numerical study of mixed convective heat transfer in a lid‐driven enclosure with rotating cylinders

Analysis of heat and fluid flow around two co-rotating side-by-side cylinders

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