Numerical Investigation of the Transfer Heat in a Annulus Cylindrical Space

Dellil, Ahmed Zineddine; Azzi, Abbès

doi:10.5755/j01.mech.19.1.3613

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…As it is observed from Table 1, M = 16 and N = 32 prove adequate validity of the numerical solutions for l = 2, while M = 16 and N = 48 for l = 3. [45] and numerical result by Dallil et al [46] with the data from the current study…”

Section: Model Validation and Grid Dependency Testsupporting

confidence: 69%

“…The speed of rotation of the duct affects heat transfer through the Nusselt number. In order to measure the effect of rotation on heat generation, the Nusselt number was calculated and compared with the experimental results conducted by Becker et al [45] and computational findings by Dallil et al [46], as shown in Fig. 5.…”

Section: Model Validation and Grid Dependency Testmentioning

confidence: 99%

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Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Islam¹,

Mondal²,

Saha³

2022

Energy Engineering

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A depth understanding of fluid flow past a curved duct having rectangular cross-section with different aspect ratios (l) are essential for various engineering applications such as in chemical, mechanical, biomechanical and bio-medical engineering. So highly ambitious researchers have given significant attention to study new characteristics of fluid flow in a curved duct. The flow characterization in the rectangular duct has been studied over a wide range of numerical and selective experimental studies. However, proper knowledge with the effects of Coriolis force for different aspect ratios is important for better understanding of the transitional behaviour and the subsequent heat generation, which is required to improve further. The purpose of this study is to reveal insight into the transitional flow pattern and heat transfer in a curved rectangular domain. The Navier-Stokes equations are solved using the spectral method, while the Crank-Nicolson method is used to solve the energy equation. An in-house FORTRAN code is developed to get the numerical solution. For post-processing purposes, Tecplot-360 and Ghost-script tools are used. The present study exposes development of Dean vortices that affect heat generation as well as thermal enhancement in the flow with underlying the flow controlling parameters, the Dean number (Dn), the Grashof number (Gr) and the Taylor number (Tr). Time-dependent results followed by phase spaces show that transient flow undergoes in the scenario 'chaotic → multi-periodic→ periodic → steady-state' generating 2-to 8-vortices for the periodic/multi-periodic flow at 2000 ≤ Tr ≤ 2205 for l = 2, whereas similar sort of flow is observed in the range of 3100 ≤ Tr ≤ 3195 for l = 3. More complicated 4-to 13-vortex solutions are obtained for the chaotic flow regime at l = 2 in the range of 0 ≤ Tr < 2200 and at l = 3 in the range of 0 ≤ Tr < 3100. The chaotic flow that occurs at the certain range of Tr proficiently intensifies the heat transfer than the unperturbed, periodic or multi-periodic flow. The overall investigation reveals that in the rotating duct, the temperature-influenced buoyancy compulsion and centrifugal-coriolis joint forces are dominant, influencing the characteristic of the fluid and thus optimizing the transfer of heat. The present investigation will contribute to enhancing the understanding of fluid flow and heat transfer of internal heating/cooling/gas turbines, electric generators, biological systems, and some separation processes.

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Section: Model Validation and Grid Dependency Testsupporting

confidence: 69%

Section: Model Validation and Grid Dependency Testmentioning

confidence: 99%

Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Islam¹,

Mondal²,

Saha³

2022

Energy Engineering

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“…They showed that the average Nusselt number increases with increase in the grooves number. Dellil and Azzi [24] have studied numerically heat transfer by convection in the cylindrical annular space. They used three geometrical configurations (the surfaces of the rotor-stator are smooth, the wall of the rotor is undulated along the cylinder and the other is smooth and the last case is: grooved stator).…”

Section: Introductionmentioning

confidence: 99%

Effect of Fin Inclination Angel on Heat Transfer Improvement in an Annular Space of a Rotor Stator

Attou

Kebir

2021

DDF

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The present work deals with the numerical investigation of forced convection flow and heat transfer in a finned concentric annulus. The outer cylinder is axially finned while the rotating inner cylinder has a smooth surface. Our research focus on the impact of the fin inclination angle on heat transfer enhancement in rotating annular channels. Tests were carried out for different geometrical configurations using fins with inclined angle (α = 30°, 60°, 90° and 120°). Numerical study is based on effective Reynolds number and Taylor number. The results obtained using the code ANSYS-Fluent with SST k-ω turbulence model show a good agreement between the experimental and the numerical results. In the presence of rotational flow (Ta = 1.14 × 106), the results indicate that α =120° is the optimal case which improves significantly the heat and mass transfer inside the finned channel.

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A review of studies on forced, natural and mixed heat transfer to fluid and nanofluid flow in an annular passage

Togun

Abdulrazzaq

Kazi

et al. 2014

Renewable and Sustainable Energy Reviews

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Numerical Investigation of the Transfer Heat in a Annulus Cylindrical Space

Cited by 3 publications

References 16 publications

Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Impacts of Rotation on Unsteady Fluid Flow and Energy Distribution through a Bending Duct with Rectangular Cross Section

Effect of Fin Inclination Angel on Heat Transfer Improvement in an Annular Space of a Rotor Stator

A review of studies on forced, natural and mixed heat transfer to fluid and nanofluid flow in an annular passage

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