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Lioua Kolsi

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Papers by Lioua Kolsi

Research paper thumbnail of Natural convection and entropy generation in a three dimensional volumetrically heated and partially divided cavity

International Journal of Numerical Methods for Heat & Fluid Flow, 2016

Research paper thumbnail of Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

International Journal of ADVANCED AND APPLIED SCIENCES, 2016

Research paper thumbnail of Computational study of the performance of the Etoile flow conditioner

International Journal of ADVANCED AND APPLIED SCIENCES, 2016

Research paper thumbnail of Numerical investigation of combined buoyancy-thermocapillary convection and entropy generation in 3D cavity filled with Al2O3 nanofluid

Alexandria Engineering Journal, 2016

Research paper thumbnail of Numerical simulation of three-dimensional double diffusive convection in a lid-driven cavity

International Journal of Thermal Sciences, 2016

Research paper thumbnail of 3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

Research paper thumbnail of A computational work on a three dimensional analysis of natural convection and entropy generation in nanofluid filled enclosures with triangular solid insert at the corners

Journal of Molecular Liquids, 2016

Research paper thumbnail of Three dimensional CFD analysis of buoyancy-driven natural ventilation and entropy generation in a prismatic greenhouse

Research paper thumbnail of Hydromagnetic Double-Diffusive Laminar Natural Convection in a Radiatively Participating Fluid

Http Dx Doi Org 10 1080 10407780590959907, Feb 24, 2007

Two-dimensional hydromagnetic double-diffusive convection of a radiatively participating fluid co... more Two-dimensional hydromagnetic double-diffusive convection of a radiatively participating fluid confined in a rectangular enclosure is studied numerically for fixed Prandtl, Rayleigh, and Lewis numbers, Pr ¼ 13.6, Ra ¼ 10 5 , Le ¼ 2. Uniform temperatures and concentrations are imposed along the vertical walls, while the horizontal walls are assumed to be adiabatic and impermeable. The damping and stabilization effects of an external horizontal magnetic field are studied for three different optical thicknesses of the semitransparent fluid as well as for an opaque medium. For moderate optical thickness, a steady compositionally dominated flow is observed for all values of Hartmann number considered, and the magnetic damping is remarkably lower than in the opaque medium, for which the flow is always thermally dominated. For optically thin and optically thick media, the thermally dominated flow is stabilized and becomes compositionally dominated as soon as the Hartmann number is increased.

Research paper thumbnail of Three dimensional analysis of natural convection and entropy generation in a sharp edged finned cavity

Alexandria Engineering Journal, 2016

Research paper thumbnail of Combined radiation-natural convection in three-dimensional verticals cavities

Research paper thumbnail of Modeling of MHD natural convection in a square enclosure having an adiabatic square shaped body using Lattice Boltzmann Method

Alexandria Engineering Journal, 2016

Research paper thumbnail of Numerical Study of Three-Dimensional Combined Buoyancy and Thermocapillary Convection and Evaluation of Entropy Generation

Purpose -The main purpose of this paper is to conduct on three-dimensional buoyancy and thermocap... more Purpose -The main purpose of this paper is to conduct on three-dimensional buoyancy and thermocapillary convection in an enclosure. Entropy generation is obtained from the calculated values of velocities and temperatures. Design/methodology/approach -As numerical method, the vorticity-vector potential formalism allows, in a three-dimensional configuration, the elimination of the pressure, which is a delicate term to treat. The control volume finite difference method is used to discretize equations. The central-difference scheme for treating convective terms and the fully implicit procedure to discretize the temporal derivatives are retained. The grid is uniform in all directions with additional nodes on boundaries. The successive relaxation iterating scheme is used to solve the resulting non-linear algebraic equations. Findings -Results are presented via entropy generation due to heat transfer, entropy generation due to fluid friction and total entropy generation. It is found that Marangoni number becomes more effective parameter on total entropy generation for lower values of Rayleigh numbers. Practical implications -In any thermal system under buoyancy induced and thermocapillary flow. Originality/value -It is believed that this is the first paper on three-dimensional solution of entropy generation in a cubical cavity under thermocapillary buoyancy flow.

Research paper thumbnail of Numerical study of heat and mass transfer optimization in a 3D inclined solar distiller

Research paper thumbnail of Inclination effects of magnetic field direction in 3D double-diffusive natural convection

Applied Mathematics and Computation, 2016

Research paper thumbnail of Influence du facteur de forme sur la convection naturelle de l’air dans des cavités rectangulaires allongées verticalement

Research paper thumbnail of Convection Naturelle Oscillatoire D’Un Melange Eau-Glycerine Dans Une Cavite Rectangulaire Allongee – Transition Vers Le Chaos

Research paper thumbnail of Three-dimensional double diffusive natural convection in a cavity with heat and mass diffusive walls

Research paper thumbnail of Experimental and Numerical Investigations of Transient Natural Convection in Differentially Heated Air-Filled Tall Cavity

Research paper thumbnail of Couplage convection gravitationnelle et thermocapillaire dans une cavité cubique

Dans ce travail nous considérons le problème de la convection naturelle d’origine gravitationnell... more Dans ce travail nous considérons le problème de la convection naturelle d’origine gravitationnelle combinée avec la convection thermocapillaire d’un métal liauide contenu dans une enceinte cubique avec une surface supérieure libre. La surface libre au dessus de l’enceinte est indéformable et les interactions avec la phase gazeuse sont négligées audessus. Les résultats concernent l’effet du nombre de Marangoni sur la structure de l’écoulement et le champ de température. Le nombre de Marangoni est égal à -103, -102, 0, 102, 103 et le nombre de Grashof égales à 2.103, 2.104 et 2.105.

Research paper thumbnail of Natural convection and entropy generation in a three dimensional volumetrically heated and partially divided cavity

International Journal of Numerical Methods for Heat & Fluid Flow, 2016

Research paper thumbnail of Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

International Journal of ADVANCED AND APPLIED SCIENCES, 2016

Research paper thumbnail of Computational study of the performance of the Etoile flow conditioner

International Journal of ADVANCED AND APPLIED SCIENCES, 2016

Research paper thumbnail of Numerical investigation of combined buoyancy-thermocapillary convection and entropy generation in 3D cavity filled with Al2O3 nanofluid

Alexandria Engineering Journal, 2016

Research paper thumbnail of Numerical simulation of three-dimensional double diffusive convection in a lid-driven cavity

International Journal of Thermal Sciences, 2016

Research paper thumbnail of 3D Buoyancy-Induced Flow and Entropy Generation of Nanofluid-Filled Open Cavities Having Adiabatic Diamond Shaped Obstacles

Research paper thumbnail of A computational work on a three dimensional analysis of natural convection and entropy generation in nanofluid filled enclosures with triangular solid insert at the corners

Journal of Molecular Liquids, 2016

Research paper thumbnail of Three dimensional CFD analysis of buoyancy-driven natural ventilation and entropy generation in a prismatic greenhouse

Research paper thumbnail of Hydromagnetic Double-Diffusive Laminar Natural Convection in a Radiatively Participating Fluid

Http Dx Doi Org 10 1080 10407780590959907, Feb 24, 2007

Two-dimensional hydromagnetic double-diffusive convection of a radiatively participating fluid co... more Two-dimensional hydromagnetic double-diffusive convection of a radiatively participating fluid confined in a rectangular enclosure is studied numerically for fixed Prandtl, Rayleigh, and Lewis numbers, Pr ¼ 13.6, Ra ¼ 10 5 , Le ¼ 2. Uniform temperatures and concentrations are imposed along the vertical walls, while the horizontal walls are assumed to be adiabatic and impermeable. The damping and stabilization effects of an external horizontal magnetic field are studied for three different optical thicknesses of the semitransparent fluid as well as for an opaque medium. For moderate optical thickness, a steady compositionally dominated flow is observed for all values of Hartmann number considered, and the magnetic damping is remarkably lower than in the opaque medium, for which the flow is always thermally dominated. For optically thin and optically thick media, the thermally dominated flow is stabilized and becomes compositionally dominated as soon as the Hartmann number is increased.

Research paper thumbnail of Three dimensional analysis of natural convection and entropy generation in a sharp edged finned cavity

Alexandria Engineering Journal, 2016

Research paper thumbnail of Combined radiation-natural convection in three-dimensional verticals cavities

Research paper thumbnail of Modeling of MHD natural convection in a square enclosure having an adiabatic square shaped body using Lattice Boltzmann Method

Alexandria Engineering Journal, 2016

Research paper thumbnail of Numerical Study of Three-Dimensional Combined Buoyancy and Thermocapillary Convection and Evaluation of Entropy Generation

Purpose -The main purpose of this paper is to conduct on three-dimensional buoyancy and thermocap... more Purpose -The main purpose of this paper is to conduct on three-dimensional buoyancy and thermocapillary convection in an enclosure. Entropy generation is obtained from the calculated values of velocities and temperatures. Design/methodology/approach -As numerical method, the vorticity-vector potential formalism allows, in a three-dimensional configuration, the elimination of the pressure, which is a delicate term to treat. The control volume finite difference method is used to discretize equations. The central-difference scheme for treating convective terms and the fully implicit procedure to discretize the temporal derivatives are retained. The grid is uniform in all directions with additional nodes on boundaries. The successive relaxation iterating scheme is used to solve the resulting non-linear algebraic equations. Findings -Results are presented via entropy generation due to heat transfer, entropy generation due to fluid friction and total entropy generation. It is found that Marangoni number becomes more effective parameter on total entropy generation for lower values of Rayleigh numbers. Practical implications -In any thermal system under buoyancy induced and thermocapillary flow. Originality/value -It is believed that this is the first paper on three-dimensional solution of entropy generation in a cubical cavity under thermocapillary buoyancy flow.

Research paper thumbnail of Numerical study of heat and mass transfer optimization in a 3D inclined solar distiller

Research paper thumbnail of Inclination effects of magnetic field direction in 3D double-diffusive natural convection

Applied Mathematics and Computation, 2016

Research paper thumbnail of Influence du facteur de forme sur la convection naturelle de l’air dans des cavités rectangulaires allongées verticalement

Research paper thumbnail of Convection Naturelle Oscillatoire D’Un Melange Eau-Glycerine Dans Une Cavite Rectangulaire Allongee – Transition Vers Le Chaos

Research paper thumbnail of Three-dimensional double diffusive natural convection in a cavity with heat and mass diffusive walls

Research paper thumbnail of Experimental and Numerical Investigations of Transient Natural Convection in Differentially Heated Air-Filled Tall Cavity

Research paper thumbnail of Couplage convection gravitationnelle et thermocapillaire dans une cavité cubique

Dans ce travail nous considérons le problème de la convection naturelle d’origine gravitationnell... more Dans ce travail nous considérons le problème de la convection naturelle d’origine gravitationnelle combinée avec la convection thermocapillaire d’un métal liauide contenu dans une enceinte cubique avec une surface supérieure libre. La surface libre au dessus de l’enceinte est indéformable et les interactions avec la phase gazeuse sont négligées audessus. Les résultats concernent l’effet du nombre de Marangoni sur la structure de l’écoulement et le champ de température. Le nombre de Marangoni est égal à -103, -102, 0, 102, 103 et le nombre de Grashof égales à 2.103, 2.104 et 2.105.

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