Investigation of the mixed convection of power-law fluids between two horizontal concentric cylinders: Effect of various operating conditions

Laidoudi, Houssem; Ameur, Houari

doi:10.1016/j.tsep.2020.100731

Cited by 29 publications

(27 citation statements)

References 36 publications

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“…The accuracy and the performance of the calculation of the software were verified in our previous research [35] and [47]. This was done by comparing the results obtained with the previous results of Kuehn and Goldstein 45 (which is experimental) and Matin and Khan 20 (which is numerical).…”

Section: Simulation Procedures and Validation Testmentioning

confidence: 60%

“…On the other hand, for Ri ≠ 0 and for all values of d/D, new flows are created by the thermal buoyancy in the space. A hot flow moving upward (from the vicinity of inner cylinders to the outer enclosure) and cold flow moving downward near the outer cylinder, as shown in [35] and [46]. These new flows combine with the rotating flow produced by the outer cylinder to form a hybrid fluid movement pattern within the space.…”

Section: Resultsmentioning

confidence: 94%

“…For the first stage, the software Gambit 46 was used to create the grid, a tetra-lateral form of elements with nonuniform grid distribution was adopted (Figure 2). The grid distribution has a For the second stage, ANSYS-CFX (14.5) was used for the simulation.…”

Section: Simulation Procedures and Validation Testmentioning

confidence: 99%

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Complex fluid flow in annular space under the effects of mixed convection and rotating wall of the outer enclosure

Laidoudi

Ameur

2022

Heat Trans

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This study aims to investigate the roles of pertinent parameters on the mixed convection of complex liquids in annular devices. The investigated area consists of two circular cylinders with fixed and heat walls. Both cylinders are enclosed within a circular room with a cold wall and rotate regularly. The zone between the inner obstacles and the outer space contains complex power-law fluids. This investigation is numerically achieved by How to cite this article: Laidoudi H, Ameur H. Complex fluid flow in annular space under the effects of mixed convection and rotating wall of the outer enclosure.

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Section: Simulation Procedures and Validation Testmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 94%

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Complex fluid flow in annular space under the effects of mixed convection and rotating wall of the outer enclosure

Laidoudi

Ameur

2022

Heat Trans

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“…An iterative procedure based on successive Non Linear Over Relaxation method (NLOR) was used to solve the discredited stream function equation [23]. There are different studies related the applications in the literature [24][25][26][27][28][29]. A convergence criterion for the stream function was imposed as each time step.…”

Section: Methodsmentioning

confidence: 99%

Numerical Simulation of Prandtl Number Effect on Entropy Generation in a Square Cavity

Ferroudj¹,

Köten²

2021

Journal of Thermal Engineering

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In this study, entropy generation in laminar mixed convection in a square fluid-filled cavity is numerically studied. The middle of the lower wall of the cavity is heated to a constant temperature Th while the side-walls are maintained at a constant temperature Tc, and moving upper ward at a constant velocity to understand the effects of irreversibility distribution on the entropy generation for different engineering applications. For the studied control surface, remaining parts of lower and upper walls are adiabatic. The finite difference method is used to solve the governing equation. The entropy analysis is carried out to determine the irreversibility which is generated in the cavity for different Prandtl number (Pr=0.0212, 0.71 and 6.35), the effect of the irreversibility distribution ratio on entropy generation was investigated. It seen that effect of irreversibility distribution ratio (γ=10 -2 and 10 -4 ) have play important role on the total entropy for different Prandtl number. Also it is clear that, for all Prandtl number, the total entropy generation increase by increasing the irreversibility distribution ratio and the increase of Prandtl number regardless the values of Ri=1 and Re=100 because of the increase of the velocity gradients.

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“…Moreover, the contribution of Lorentz force for bio-convective model is another important task which is addressed in this model. The flow though moving cylinder is interesting topic and some continuations are performed by researchers [ 41 – 50 ]. This investigation presents the answer of following thermal flow questions:…”

Section: Introductionmentioning

confidence: 99%

Applications of bioconvection for tiny particles due to two concentric cylinders when role of Lorentz force is significant

et al. 2022

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The bioconvection flow of tiny fluid conveying the nanoparticles has been investigated between two concentric cylinders. The contribution of Lorenz force is also focused to inspect the bioconvection thermal transport of tiny particles. The tiny particles are assumed to flow between two concentric cylinders of different radii. The first cylinder remains at rest while flow is induced due to second cylinder which rotates with uniform velocity. Furthermore, the movement of tiny particles follows the principle of thermophoresis and Brownian motion as a part of thermal and mass gradient. Similarly, the gyro-tactic microorganisms swim in the nanofluid as a response to the density gradient and constitute bio-convection. The problem is modeled by using the certain laws. The numerical outcomes are computed by using RKF -45 method. The graphical simulations are performed for flow parameters with specific range like 1≤Re≤5, 1≤Ha≤5, 0.5≤Nt≤2.5, 1≤Nb≤3, 0.2≤Sc≤1.8, 0.2≤Pe≤1.0 and 0.2≤Ω≤1.0. It is observed that the flow velocity decreases with the increase in the Hartmann number that signifies the magnetic field. This outcome indicates that the flow velocity can be controlled externally through the magnetic field. Also, the increase in the Schmidt numbers increases the nanoparticle concentration and the motile density.

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Investigation of the mixed convection of power-law fluids between two horizontal concentric cylinders: Effect of various operating conditions

Cited by 29 publications

References 36 publications

Complex fluid flow in annular space under the effects of mixed convection and rotating wall of the outer enclosure

Complex fluid flow in annular space under the effects of mixed convection and rotating wall of the outer enclosure

Numerical Simulation of Prandtl Number Effect on Entropy Generation in a Square Cavity

Applications of bioconvection for tiny particles due to two concentric cylinders when role of Lorentz force is significant

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