Simulation of Non Newtonian Power-Law Fluid Flows and Mixed Convection Heat Transfer inside of Curved Duct

Bouzit, Fayçal; Laidoudi, Houssem; Bouzit, Mohamed

doi:10.4028/www.scientific.net/ddf.378.113

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…The forced and natural have an equal contribution of heat transfer at Ri = 1. Bouzit et al [17] simulated through two-dimensional numerical investigation the effect of thermal buoyancy and rheological flow behavior of non-Newtonian flow inside a curved channel the governing equations are solved with the range of following conditions: Re = 40 to 1000, Ri = 0 to 1 and n = 0.4 to 1.2 at fixed value of Prandtl number 0f Pr = 7. The results showed that some alternative vortices are seen to be appeared on duct walls and its number is seen to be increased with gradual increase in Richardson number as well as Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

3D Simulation of Incompressible Poiseuille Flow through 180° Curved Duct of Square Cross-section under Effect of Thermal Buoyancy

Mokeddem

Laidoudi

Makinde

et al. 2019

Period. Polytech. Mech. Eng.

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In this paper, three-dimensional numerical simulations are carried out to investigate and analyze the gradual effects of thermal buoyancy strength on laminar flow of an incompressible viscous fluid and heat transfer rate inside a 180° curved channel of square cross-section. The governing equations of continuity, momentum and energy balance are obtained and solved numerically using finite volume method. The effect of Dean number, De, and Richardson number, Ri, on dimensionless velocity profiles and Nusselt number are examined for the conditions: De = 125 to 150, Ri = 0 to 2 at Pr = 1. The mean results are illustrated in terms of streamline and isotherm contours to interpret the flow behaviors and its effect on heat transfer rate. Dimensionless velocity profiles and the local Nusselt number at the angle 0° and 90° are presented and discussed. Also, the average Nusselt number on surfaces of curved duct is computed. The obtained results showed that by adding thermal buoyancy to computed domain, some early Dean vortices are observed at the angle 0° and new sort are observed at 90°. Furthermore, increase in Dean number increases the heat transfer rate. In other hand, increase in Richardson number decreases the average Nusselt number of 180° curved duct.

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Section: Introductionmentioning

confidence: 99%

3D Simulation of Incompressible Poiseuille Flow through 180° Curved Duct of Square Cross-section under Effect of Thermal Buoyancy

Mokeddem

Laidoudi

Makinde

et al. 2019

Period. Polytech. Mech. Eng.

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Natural Convection of Non-Newtonian Dilatant Fluid in the Gap Between an Outer Cylinder and Inner Cylinder With Grooves

Benhizia,

Bouzit

2024

Heat Trans Res

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This paper reports a numerical study of the laminar free convection of dilatant fluid between two concentric cylinders. The simulations have been performed for the two-dimensional steady state and the ANSYS CFX 16.2 was used as theoretical-computational approach to achieve detailed and realistic results. The finite volume method was used for that objective. The governing problem parameters are taken as 1 ≤ n ≤ 1.6,10 ≤ Pr ≤ 103, 103≤ Ra ≤ 105 and a different number of grooves was added to the inner cylinder (4, 8, 12, and 16). We give detailed explanations on the effects of the precedent coefficients on the streamlines, isotherms, velocity, and dimensionless temperature. It is found that dilatant fluids display the behavior like a solid more than a solution. The Rayleigh number strengthens the convective flow which refers by increasing in the Nusselt number at the same set of the other parameters. Also, the important phenomenon here (effects of the grooves) will take a large part from the discussion section. When the grooves accomplished a given number and n is high, the fluid is stiff and the heat transfer mode is purely by conduction.

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Study of the Rheological Behaviour and the Curvature Radius Effects on a Non Newtonian Fluid Flow in a Curved Square Duct

Bouzit

Mokeddem

2022

JERA

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Abstract. Fluid flows through curved pipes are frequently encountered in various industrial or biomedical applications. These flows, under the effect of the centrifugal force resulting from the curvature of the pipe, causes an instability phenomenon known as Dean instability, which results in the appearance of two or more counter-rotating vortex cells. The objective of this work is to determine numerically the effect of geometric parameters and rheological behavior of the fluid, including the index of behavior on the occurrence and development of the instability of Dean in a 180° curved duct. The governing equations including the full Navier-Stokes, the continuity and the Momentum are solved in three dimensions using the commercial code ANSYS-CFX, under the conditions of laminar, stationary and incompressible flow. In the first part, the results of the flow of a shear thinning fluid and a shear thickening fluid for a Dean number Dn = 125 and a radius of curvature Rc = 15.1 are presented. These calculation results gave a good agreement with the measured values extracted from the literature. The second part concerns the influence of the curvature ratio and the rheological behaviour of the fluid, the presence of two stationary secondary recirculations, as well as the appearance and the development of two additional vortices are highlighted. The main point observed is that the decrease in the curvature radius increases the instability of the flow through the pipe and this increases the number of vortex cells (Dean vortex). The velocity of the flow and its rheological nature are essential parameters for the reduction of instability in the canal.

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Simulation of Non Newtonian Power-Law Fluid Flows and Mixed Convection Heat Transfer inside of Curved Duct

Cited by 5 publications

References 16 publications

3D Simulation of Incompressible Poiseuille Flow through 180° Curved Duct of Square Cross-section under Effect of Thermal Buoyancy

3D Simulation of Incompressible Poiseuille Flow through 180° Curved Duct of Square Cross-section under Effect of Thermal Buoyancy

Natural Convection of Non-Newtonian Dilatant Fluid in the Gap Between an Outer Cylinder and Inner Cylinder With Grooves

Study of the Rheological Behaviour and the Curvature Radius Effects on a Non Newtonian Fluid Flow in a Curved Square Duct

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