Numerical Study of Natural Convection Between Two Coaxial Inclined Cylinders

Gourari, S.; Mebarek‐Oudina, Fateh; Hussein, Ahmed Kadhim; Kolsi, Lioua; Hassen, Walid; Younis, Obai

doi:10.18280/ijht.370314

Cited by 59 publications

(15 citation statements)

References 16 publications

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“…This special attention is due to its significant applications in many industrial sectors. Examples of these sectors include solar receivers, crystal growth, float glass production, packaging of semiconductors, petroleum reservoirs, landing gear wells, geothermal energy systems, and an electronic chips . In this manner, the heat transfer and the flow field characteristics were investigated for the mixed convection problem in a cavity‐channel combination was investigated by many authors.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Laouira

Mebarek‐Oudina

Hussein

et al. 2019

Heat Trans. Asian Res.

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The heat transfer phenomena inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths was investigated numerically in the present work. The heat source is considered as a local heating element of varying length, which is embedded at the bottom wall of the enclosure and maintained at a constant temperature.The air flow enters the channel horizontally at a constant cold temperature and a fixed velocity. The other walls of the enclosure and the channel are kept thermally insulated. The flow is assumed laminar, incompressible, and two-dimensional, whereas the fluid is considered Newtonian. The results are presented in the form of the contours of velocity, isotherms, and Nusselt numbers profiles for various values of the dimensionless heat source lengths (0.16 ≤ ε ≤ 1). while, both Prandtl and Reynolds numbers are kept constant at (Pr = 0.71) and (Re = 100), respectively. The results indicated that the distribution of the isotherms depends significantly on the length of the heat source. Also, it was noted that both the local and the average Nusselt numbers increase as the local heat source length increases. Moreover, the maximum temperature is located near the heat source location.

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Section: Introductionmentioning

confidence: 99%

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Laouira

Mebarek‐Oudina

Hussein

et al. 2019

Heat Trans. Asian Res.

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“…They concluded that, the entropy generation rate is more significant near the plates than that of the channel interface. Few more investigators have discussed the entropy generation analysis in diverse situations (industrial engineering problems in complex configurations) by diverse numerical techniques such as finite volume method (Voller, 2009;Janalizadeh et al, 2013;Mebarek-Oudina, 2019, 2017Laouira et al, 2020;Mebarek-Oudina and Makinde, 2018;Gourari et al, 2019; and finite element methods (Marzougui et al, 2020;Zaim et al, 2020;Navti et al, 1998;Lewis et al, 2004;Nithiarasu et al, 2016;Lewis et al, 1996;Bevan et al, 2016;Lewis et al, 2005;Lewis et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

A computational analysis of heat transport irreversibility phenomenon in a magnetized porous channel

Marzougui

Bouabid

Mebarek‐Oudina

et al. 2020

HFF

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Purpose The purpose of this paper is to evaluate the temperature, the Dirichlet conditions have been considered to the parallel horizontal plates. The model of generalized Brinkman-extended Darcy with the Boussinesq approximation is considered and the governing equations are computed by COMSOL multiphysics. Design/methodology/approach In the current study, the thermodynamic irreversible principle is applied to study the unsteady Poiseuille–Rayleigh–Bénard (PRB) mixed convection in a channel (aspect ratio A = 5), with the effect of a uniform transverse magnetic field. Findings The effects of various flow parameters on the fluid flow, Hartmann number (Ha), Darcy number (Da), Brinkman number (Br) and porosity (ε), are presented graphically and discussed. Numerical results for temperature and velocity profiles, entropy generation variations and contour maps of streamlines, are presented as functions of the governing parameter mentioned above. Basing on the generalized Brinkman-extended Darcy formulation, which allows the satisfaction of the no-slip boundary condition on a solid wall, it is found that the flow field and then entropy generation is notably influenced by the considering control parameters. The results demonstrate that the flow tends toward the steady-state with four various regimes, which strongly depends on the Hartman and Darcy numbers variations. Local thermodynamic irreversibilities are more confined near the active top and bottom horizontal walls of the channel when increasing the Da and decreasing the Hartmann number. Entropy generation is also found to be considerably affected by Brinkman number variation. Originality/value In the present work, we are presenting our investigations on the influence of a transverse applied external magnetohydrodynamic on entropy generation at the unsteady laminar PRB flow of an incompressible, Newtonian, viscous electrically conducting binary gas mixture fluid in porous channel of two horizontal heated plates. The numerical solutions for the liquid velocity, the temperature distribution and the rates of heat transport and entropy generation are obtained and are plotted graphically.

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“…This is due its applications in various industrial sectors. Such as solar receivers, petroleum reservoirs, landing gear wells, crystal growths, geothermal energy systems, float glass production, packaging of semiconductors and electronic chips [1][2][3][4][5][6][7][8][9][10][11][12]. In fact, the characteristics of heat transfer and the flow field for the mixed.…”

Section: Introductionmentioning

confidence: 99%

“…Convection problem in a combination of cavity channel are investigated. Gourari et al [12] presented a study of convective flow between two coaxial inclined cylinders, where the inner cylinder generates a constant heat source. They found that, his improvement of heat transfer with increasing Rayleigh number, and the best heat transfer is detected for the inclination angle 90 °.…”

Section: Introductionmentioning

confidence: 99%

Convection Heat Transfer Analysis in a Channel with an Open Trapezoidal Cavity: Heat Source Locations effect

et al. 2020

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In this work, a numerical study of mixed convection inside a horizontal channel with an open trapezoidal enclosure subjected to a discrete heat source in different locations is carried out. The heat source with the length of ε = 0.75, is maintained at a constant temperature. The air flow with a fixed velocity and a cold temperature enters the channel horizontally. The other walls of the enclosure and the channel are adiabatic. The results are presented in the form of the contours of velocity, isotherms and Nusselt numbers profiles for various heat source locations, Prandtl number (Pr = 0.71) and Reynolds number (Re = 100) respectively. The distribution of the isotherms depends significantly on the position of the heat source. We noted that the best heat transfer is detected where the heat source is placed in the top of the left .

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Numerical Study of Natural Convection Between Two Coaxial Inclined Cylinders

Cited by 59 publications

References 16 publications

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

Heat transfer inside a horizontal channel with an open trapezoidal enclosure subjected to a heat source of different lengths

A computational analysis of heat transport irreversibility phenomenon in a magnetized porous channel

Convection Heat Transfer Analysis in a Channel with an Open Trapezoidal Cavity: Heat Source Locations effect

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