Numerical Study of Laminar Natural Convection in a Finned Annulus: Low Isothermal Blocks Positions

Touzani, Sara; Idrissi, Ahmed; Cheddadi, Abdesselam; Ouazzani, M. T.

doi:10.1007/s10891-019-02021-6

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Laidoudi [20] numerically examined the free convection from four circular cylinders in enclosed space of circular form. There are also new researches that touched the natural convection in annular space as: [21][22][23][24][25]. In addition to this, there are other works with similar research objectives [26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space

Zoubai,

Bouhamida

2023

DDF

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We try through this research to present a detailed study on free convection heat transfer inside a closed space. The work is carried out in numerical way, using the method called finite volume. The governing equations are solved for numerical simulations of steady state and laminar regime. The studied domain is an annular space consisting mainly of two cylinders positioned horizontally, the inner cylinder has an elliptical shape with different aspect ratio (E) while the outer one has a single shape which is circular. The primary conditions adopted in this research are as follow: the outer cylinder has a cold surface, while the inner cylinder has a cold surface. The space between cylinders is considered to be filled with fluid of different values of thermo-physical proprieties (Pr). The fluid in the space moves under the influence of thermal buoyancy which is controlled by Ri number. The pertinent parameters for this research are: the aspect ratio of elliptical cylinder which is E = 0.1 to 1, the Prandtl number Pr = 1 to 100 and finally the Richardson number Ri = 103, 104 and 105. The results of this work show that the elliptical form allows an increase in thermal transfer activity. Also, values of the number Pr have a limited effect on heat transfer.

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Section: Introductionmentioning

confidence: 99%

The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space

Zoubai,

Bouhamida

2023

DDF

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“…The concentration of nanoparticles, Ra number and the size of inner cylinder on the flow and thermal activity was the treated point. Here [15][16][17][18][19][20][21][22][23], there are also new works on the natural convection in a horizontal annulus for different situation such as porous domain, nanofluids, MHD etc. There are also some new works on the buoyancy-driven flow enclosed annular space [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Natural Convection from Two Hot Semi-Circular Cylinder Confined in Cold Circular Cylinder

Helmaoui

Laidoudi

Ghenaim³

2021

DDF

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Numerical simulations were performed to study the pertinent parameters of natural convection in annular space. The studied geometry consists of two semi-circular cylinders of hot walls confined in cold cavity of circular cross-sectional form. The simulations were done by solving numerically the governing equations via the commercial software ANSYS-CFX. The results showed that this new form of inner cylinders is suitable for insulating applications. The pertinent parameters were selected for this work were: Prandtl number (Pr = 0.71 to 1000) and Rayleigh number (Ra = 103, 104 and 105).

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“…When the natural convection occurs between two enclosed cylinders is usually called an annular system [1][2][3]. Some numerical and experimental works studied the geometrical configurations of the horizontal annulus, the thermophysical parameters of fluid and the strength of thermal buoyancy [4][5][6][7][8]. The previous researches in this field showed that the thermophysical characteristics of the fluids are controlled by a dimensionless number called Prandtl number [9,10]; for example, the Prandtl number corresponding to the air is 0.71, water is 7.01 and for certain kinds of polymers are 50 and 100.…”

Section: Introductionmentioning

confidence: 99%

Buoyancy-driven flow in annular space from two circular cylinders in tandem arrangement

Laidoudi

2020

Metall Mater Eng

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The two-dimensional numerical investigation is well accomplished to understand the behavior of buoyancy-driven flow in closed annular space. The studied domain consists of a pair of equal-sized circular cylinders in tandem arrangement confined in a circular enclosure which is filled with incompressible Newtonian fluid. The inner cylinders are identical in size and they are supposed to be hot with constant temperature, the outer circular enclosure is kept cold with a constant temperature. The descriptive governing equations of continuity, momentum and energy for the present problem are solved numerically using the finite-volume method. The present research studies the effects of thermal buoyancy strength, the thermophysical characteristics of the fluid, and the size of the inner cylinders on the flow patterns inside the circular domain and rate of heat transfer exchanging between the inner cylinders and fluid flow. The results showed that the studied governing parameters significantly affect the fluid flow and heat transfer rate. An increase in the diameter of inner cylinders makes the effect of buoyancy strength on fluid flow and heat transfer negligible for all values of thermo-physical parameters. Also, the average Nusselt number of each inner cylinder is computed and plotted for industrial applications.

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Numerical Study of Laminar Natural Convection in a Finned Annulus: Low Isothermal Blocks Positions

Cited by 7 publications

References 23 publications

The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space

The Effect of Elliptical Form of Cylinder on Free Convection in Annular Space

Natural Convection from Two Hot Semi-Circular Cylinder Confined in Cold Circular Cylinder

Buoyancy-driven flow in annular space from two circular cylinders in tandem arrangement

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