Conjugate Heat Transfer With Variable Fluid Properties in a Heated Horizontal Annulus

Touahri, Sofiane; Boufendi, Toufik

doi:10.1615/heattransres.2015005019

Cited by 4 publications

(3 citation statements)

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“…In addition to the inertial and centrifugal forces, the buoyancy forces generated by temperature gradients must be taken into account. These forces are at the origin of a secondary flow in mixed convection and have been shown to improve heat transfer in horizontal ducts [12][13]. For rotating flows, their influence in mixed convection mode is developed by Lei and Bakhtier [14] and Choi and Kim [15].…”

Section: Introductionmentioning

confidence: 99%

Taylor-Couette flow with mixed convection heat transfer and variable properties in a horizontal annular pipe

2022

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Taylor-Couette flows in a horizontal annular gap between finite coaxial cylinders in rotor-stator configuration are numerically investigated. The inner cylinder (rotor) rotates at a constant angular velocity while the outer cylinder (stator) is at rest. They are limited at their extremities by two fixed walls that prevent axial fluid flow. In addition, a heat transfer is generated by an imposed temperature difference, with the rotor hotter than the stator while the end-walls are adiabatic. The fluid physical properties are temperature dependent. This non-linear physics problem, with a strong coupling of the conservation equations and boundary conditions, is solved by a finite volume method with numerical schemes of second order space and time accuracies. The radius and aspect ratios and the Taylor, Grashof and Prandt numbers are the control parameters. The developed numerical code has been tested for different meshes and perfectly validated. Extensive calculations have been made in large ranges of the Taylor and Grashof numbers to analyze the Taylor-Couette flow in convection modes. The results highlight the dynamic and thermal instabilities generated in the Taylor Couette flow from the appearance of Ekman cells to the Taylor vortex propagation in the entire annulus. The combined effect of these vortices with the secondary flow improves the heat transfer. Furthermore, the influence of the physical properties in the radial direction is more marked in the vicinity of the walls. Finally, we propose an empirical correlation of the Nusselt number in the studied parameter ranges.

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Section: Introductionmentioning

confidence: 99%

Taylor-Couette flow with mixed convection heat transfer and variable properties in a horizontal annular pipe

2022

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“…The effect of variable fluid properties on the mixed convection has been numerically studied by Touahri and Boufendi. [9,10] with a 3-D conjugate heat transfer in an annular space between two horizontal cylinders, the external cylinder heated by an electric current passing through its small thickness and the internal cylinder being insulated. The thermal convection in the fluid domain is conjugated to the thermal conduction in the solid.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of developing laminar mixed convection in a heated annular duct with temperature dependent properties

2019

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This study presents a numerical simulation of the 3-D laminar mixed convection between two concentric horizontal cylinders with physical properties which depend on temperature. The outer cylinder is subjected to an internal energy generated by the Joule effect whereas the inner cylinder is adiabatic. The flow and thermal fields are modeled by the continuity, momentum, and energy equations with appropriate initial and boundary conditions using a cylindrical coordinate system. The model equations are numerically solved by a finite volume method with a second order accurate spatiotemporal discretization. For the considered geometric, dynamic and thermal controlling parameters, it is found that the transverse flow is always the cause of the circumferential variation of the temperature and the physical properties of the fluid. The phenomenon of the temperature stratification is highlighted and the vortices obtained lead to an improvement in the heat transfer quantified by the increase in the number of Nusselt. The obtained axial Nusselt number increases with the increased of Grashof number which is proportional to the heat flux imposed at the surface of the outer cylinder.

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“…Moreover, radioactive heat transfer play a vital role in science and technology such as heating and cooling chamber, rivers, canals, dams, food processing, textile engineering and many other industrial processes. Many researchers [1][2][3][4][5] are developing new energy sources and technologies of renewable energy. In addition, most of the computer system and electrical powers dissipate the heat energy therefore heat source and sink are important for the reliable performance of electronic operators.…”

Section: Introductionmentioning

confidence: 99%

Radiative Heat Transfer in the Chemically Reactive Unsteady MHD Squeezed Flow of Second Order Fluid with Heat Source

Maqbool

Sohail

et al. 2018

RDMS

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This study investigates the radiative heat and mass transfer effects on squeezed flow of unsteady MHD second order fluid with heat source and chemical reaction. This study is carried out between two parallel circular plates under the assumption of axisymmetric squeezed flow. Similarity transform method is used to reduce the system of partial differential equation (PDE's) into the system of ordinary differential equations (ODE's). Advanced Collocation Method is used to find the solutions of nonlinear ordinary differential equations for velocity profile, pressure distribution, and temperature and concentration field. Effects of pertinent physical parameters on the computational results for the radial and axial velocity, pressure distrinution, and temperature and concentration profile are presented via graphs. The shear stress, heat transfer rate and mass transfer rate on the upper wall are also shown by the help of graphs.

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Conjugate Heat Transfer With Variable Fluid Properties in a Heated Horizontal Annulus

Cited by 4 publications

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Taylor-Couette flow with mixed convection heat transfer and variable properties in a horizontal annular pipe

Taylor-Couette flow with mixed convection heat transfer and variable properties in a horizontal annular pipe

Numerical study of developing laminar mixed convection in a heated annular duct with temperature dependent properties

Radiative Heat Transfer in the Chemically Reactive Unsteady MHD Squeezed Flow of Second Order Fluid with Heat Source

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