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Auteur Toufik Boufendi |
Documents disponibles écrits par cet auteur (5)
Affiner la recherche Interroger des sources externesContribution à l’etude théorique des fluides caloporteurs tel les nanofluides; / Oussama Benzeggouta
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Titre : Contribution à l’etude théorique des fluides caloporteurs tel les nanofluides; : Comparaison avec les fluides caloporteurs usuels. Type de document : texte imprimé Auteurs : Oussama Benzeggouta, Auteur ; Toufik Boufendi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 127 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Energies Renouvelables Nanofluide convection forcée et mixte simulation numérique conductivité thermique conduit cylindrique horizontal Nanofluid Forced and mixed convection Numerical simulation Thermal conductivity Horizontal pipe سائل يحتوي جسيمات نانومتريه حمل قسري وهجين محاكاة رقمية ناقلية حرارية أنبوب أفقي Index. décimale : 530 Physique Résumé :
The present work is concerned of numerical simulation of three-dimensional laminar forced and mixed convection of nanofluids. The effects of nanoparticle material, base fluid and volume concentration were highlighted. Al2O3-eau, Cu-eau and Al2O3-eau/ éthylène-glycol nanofluides were employed in this study at multiple volume fractions. The flow geometry is horizontal smooth pipe submitted to a constant and uniform heat flux. Based on single-phase approach, three dimensional conservation equations of mass, momentum and energy with the appropriate boundary conditions have been solved using finite volume method with the schemes of spatial and temporal discretization of second order precision and by using the SIMPLER. At a fixed Reynolds number Re = 300 and Grashof number varying from 0 to 5×105. The results show an increase in heat transfer ratio compared to pure water at several volume fractions for both alumina and copper based nanofluids. At a fixed volume fraction, the axial Nusselt number does not increase significantly in forced convection case. However, in mixed convection case the axial Nusselt number augments considerably especially with Cu-water nanofluid. Instead, the dispersion of the alumina nanoparticles in the water / ethylene glycol mixture with two volume concentrations 30 and 50% gives a better heat transfer ratio compared to pure water base fluid. On the other hand, secondary flow and axial velocity are slightly affected by nanoparticles volume fraction. It is proved in this study that nanofluids can also contributes to optimise pipes compactness, using 2% and 4% of alumina and copper respectively dispersed in water flowing through a pipe with given length gives higher axial Nusselt number ratio compared to pipes larger length but containing pure water.Diplôme : Doctorat En ligne : ../theses/physique/BEN7543.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11383 Contribution à l’etude théorique des fluides caloporteurs tel les nanofluides; : Comparaison avec les fluides caloporteurs usuels. [texte imprimé] / Oussama Benzeggouta, Auteur ; Toufik Boufendi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 127 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Energies Renouvelables Nanofluide convection forcée et mixte simulation numérique conductivité thermique conduit cylindrique horizontal Nanofluid Forced and mixed convection Numerical simulation Thermal conductivity Horizontal pipe سائل يحتوي جسيمات نانومتريه حمل قسري وهجين محاكاة رقمية ناقلية حرارية أنبوب أفقي Index. décimale : 530 Physique Résumé :
The present work is concerned of numerical simulation of three-dimensional laminar forced and mixed convection of nanofluids. The effects of nanoparticle material, base fluid and volume concentration were highlighted. Al2O3-eau, Cu-eau and Al2O3-eau/ éthylène-glycol nanofluides were employed in this study at multiple volume fractions. The flow geometry is horizontal smooth pipe submitted to a constant and uniform heat flux. Based on single-phase approach, three dimensional conservation equations of mass, momentum and energy with the appropriate boundary conditions have been solved using finite volume method with the schemes of spatial and temporal discretization of second order precision and by using the SIMPLER. At a fixed Reynolds number Re = 300 and Grashof number varying from 0 to 5×105. The results show an increase in heat transfer ratio compared to pure water at several volume fractions for both alumina and copper based nanofluids. At a fixed volume fraction, the axial Nusselt number does not increase significantly in forced convection case. However, in mixed convection case the axial Nusselt number augments considerably especially with Cu-water nanofluid. Instead, the dispersion of the alumina nanoparticles in the water / ethylene glycol mixture with two volume concentrations 30 and 50% gives a better heat transfer ratio compared to pure water base fluid. On the other hand, secondary flow and axial velocity are slightly affected by nanoparticles volume fraction. It is proved in this study that nanofluids can also contributes to optimise pipes compactness, using 2% and 4% of alumina and copper respectively dispersed in water flowing through a pipe with given length gives higher axial Nusselt number ratio compared to pipes larger length but containing pure water.Diplôme : Doctorat En ligne : ../theses/physique/BEN7543.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11383 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7543 BEN/7543 Thèse Bibliothèque principale Thèses Disponible
Titre : Ecoulement de couette sphérique contrarotatif- Effet du nombre de Rossby Type de document : texte imprimé Auteurs : Meriem Khemici, Auteur ; Univ. de Constantine, Éditeur scientifique ; Toufik Boufendi, Directeur de thèse Année de publication : 2008 Importance : 97 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Volumes finis Ecoulement de couette sphérique Sphères contrarotatives Effet du nombre de Rossby Index. décimale : 530 Physique Diplôme : Magistère En ligne : ../theses/physique/KHE5242.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3455 Ecoulement de couette sphérique contrarotatif- Effet du nombre de Rossby [texte imprimé] / Meriem Khemici, Auteur ; Univ. de Constantine, Éditeur scientifique ; Toufik Boufendi, Directeur de thèse . - 2008 . - 97 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Volumes finis Ecoulement de couette sphérique Sphères contrarotatives Effet du nombre de Rossby Index. décimale : 530 Physique Diplôme : Magistère En ligne : ../theses/physique/KHE5242.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3455 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KHE/5242 KHE/5242 Thèse Bibliothèque principale Thèses Disponible
Titre : Elaboration et caractérisation physico chimique des matériaux biosourcés. Type de document : texte imprimé Auteurs : Nadjoua Bellel, Auteur ; Toufik Boufendi, Directeur de thèse Mention d'édition : 17/06/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 103 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Energies Renouvelables Propriétés physico-chimiques Matériaux biosourcés Ciment Portland Fibre de palmier-dattier Conductivité thermique Physico-chemical properties Biosourced materials Portland cement Date palm fiber Thermal conductivity الخواص الفيزيائية - الكيميائية المواد الحيوية الاسمنت البورتلاندي ألياف الناقلية الحرارية Index. décimale : 530 Physique Résumé :
This thesis is devoted, on the one hand, to the analysis of the physico-chemical and morphological properties of date palm fibers and, on the other hand, to the physico-chemical characterization of biosourced materials composed of Portland cement and fibers (DPF) through IRTF, XRD, Raman, SEM analyses. The main objective is the use of these materials as thermal insulating materials in wall cladding. The experimental results obtained show that the high content of cellulose in DPF gives them a very high absorption capacity. The chemical composition of the matrix was not affected by the incorporation of date palm fiber, it was also noted that the reinforcement of the cement with the fiber induces an increase in porosity. Thermogravimetric tests (TGA) coupled with Differential Scanning Calorimetry (DSC) are carried out to study mass loss and degradation as a function of temperature rise of fibrous cement composites. Thermal conductivity measurement susing the hot-wire method have also been carried out to evaluate the effect of fiber content on the thermal properties of the materials. The results show that the addition of date palm fibbers decreases the thermal conductivity of
composite materials. Thus, date palm fiber cement is a good candidate for thermal insulation applications in housing.
Diplôme : Doctorat En ligne : ../theses/physique/BEL7770.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11603 Elaboration et caractérisation physico chimique des matériaux biosourcés. [texte imprimé] / Nadjoua Bellel, Auteur ; Toufik Boufendi, Directeur de thèse . - 17/06/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 103 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Energies Renouvelables Propriétés physico-chimiques Matériaux biosourcés Ciment Portland Fibre de palmier-dattier Conductivité thermique Physico-chemical properties Biosourced materials Portland cement Date palm fiber Thermal conductivity الخواص الفيزيائية - الكيميائية المواد الحيوية الاسمنت البورتلاندي ألياف الناقلية الحرارية Index. décimale : 530 Physique Résumé :
This thesis is devoted, on the one hand, to the analysis of the physico-chemical and morphological properties of date palm fibers and, on the other hand, to the physico-chemical characterization of biosourced materials composed of Portland cement and fibers (DPF) through IRTF, XRD, Raman, SEM analyses. The main objective is the use of these materials as thermal insulating materials in wall cladding. The experimental results obtained show that the high content of cellulose in DPF gives them a very high absorption capacity. The chemical composition of the matrix was not affected by the incorporation of date palm fiber, it was also noted that the reinforcement of the cement with the fiber induces an increase in porosity. Thermogravimetric tests (TGA) coupled with Differential Scanning Calorimetry (DSC) are carried out to study mass loss and degradation as a function of temperature rise of fibrous cement composites. Thermal conductivity measurement susing the hot-wire method have also been carried out to evaluate the effect of fiber content on the thermal properties of the materials. The results show that the addition of date palm fibbers decreases the thermal conductivity of
composite materials. Thus, date palm fiber cement is a good candidate for thermal insulation applications in housing.
Diplôme : Doctorat En ligne : ../theses/physique/BEL7770.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11603 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7770 BEL/7770 Thèse Bibliothèque principale Thèses Disponible Étude Numérique des écoulements thermoconvectifs d’un nanofluide à travers un espace cylindrique annulaire muni d’ailettes / Mohammed Benkhedda
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Titre : Étude Numérique des écoulements thermoconvectifs d’un nanofluide à travers un espace cylindrique annulaire muni d’ailettes Type de document : texte imprimé Auteurs : Mohammed Benkhedda, Auteur ; Toufik Boufendi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 251 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Nanofluide Convection mixte Cylindre annulaire horizontal Monophasique Ailettes longitudinales Nanofluide hybride Volumes finis Nanofluid Mixed convection Horizontal annular cylinder Single phase longitudinal fins Hybrid nanofluid Finite volume ائع نانوي الحمل الحراري مختلطة اسطوانة حلقية أفقية أحادي الطور زعانف طولية مائع نانوي
هجين الحجوم المنتهيةIndex. décimale : 530 Physique Résumé : The doctoral project concerns a three-dimensional numerical study of the thermo-convective flows of a nanofluid through an annular cylindrical space without fin and equipped with fins. Newtonian, incompressible and laminar flow with temperature dependent physical properties. The single-phase approach is adopted. The outer cylinder is uniformly heated while the inner cylinder is adiabatic. The flow and thermal fields are modeled by the continuity equation, the three momentum equations and the energy equation of the nanofluid with appropriate initial and boundary conditions using a cylindrical coordinate system. The nonlinear differential equations with partial derivatives are solved numerically by the finite volume method with a spatio-temporal discretization of the second order. The SIMPLER algorithm was used to solve the speed-pressure coupling. A complete parametric analysis on the effect of the presence of nanoparticles dispersed in the fluid such as volume fraction, type and shape on the development of thermal and hydrodynamic fields. The dimensionless control parameters that control the problem under consideration are the Reynolds number, the Prandtl number and the Grashof number, a radius ratio set to 2. For the volume fraction ranging from 0 to 10%, six nanoparticles Types, two metallic types Cu and Ag, three ceramics Al2O3, TiO2 and CuO. Also four forms of the nanoparticles are the shape the spherical shape, Blade, Cylinder, Platelet and Bricks shape. The study of these effects on heat transfer in a annular cylinder without fins and with fins is the main objective of this study. The results concerning the different cases studied for the effect of the volume fraction of the different nanofluids shows that the increase in the volume fraction increases the heat transfer along the annular duct. The axial and mean Nusselt numbers obtained are also higher in the case of the nanofluid (Ag / water). They also show that the use of the Ag nanoparticle induces a better improvement of the heat transfer followed by Cu, Al2O3, CuO at the end TiO2. Regarding the effect of the shape of the nanoparticles Blade shape greatly improves the heat transfer compared to other shapes. A generating correlation expresses the average Nusselt number for the different shapes as a function of the volume fraction proposed: Nu moy = a + bϕ + cϕ2. Another correlation which expresses the average Nusselt number of the nanofluid (TiO2/water) and the hybrid nanofluid (Ag-TiO2 / water) as a function of the number of Grashof, Prandtl and the volume fraction: The use of the heat-generating fins, attached longitudinally to the outer cylinder and immersed in the nanofluid, greatly improves the heat transfer compared to those of a nonfinned horizontal duct dû to the increase in the exchange area between The nanofluid and the fins in the annular space.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU7334.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10984 Étude Numérique des écoulements thermoconvectifs d’un nanofluide à travers un espace cylindrique annulaire muni d’ailettes [texte imprimé] / Mohammed Benkhedda, Auteur ; Toufik Boufendi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 251 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Nanofluide Convection mixte Cylindre annulaire horizontal Monophasique Ailettes longitudinales Nanofluide hybride Volumes finis Nanofluid Mixed convection Horizontal annular cylinder Single phase longitudinal fins Hybrid nanofluid Finite volume ائع نانوي الحمل الحراري مختلطة اسطوانة حلقية أفقية أحادي الطور زعانف طولية مائع نانوي
هجين الحجوم المنتهيةIndex. décimale : 530 Physique Résumé : The doctoral project concerns a three-dimensional numerical study of the thermo-convective flows of a nanofluid through an annular cylindrical space without fin and equipped with fins. Newtonian, incompressible and laminar flow with temperature dependent physical properties. The single-phase approach is adopted. The outer cylinder is uniformly heated while the inner cylinder is adiabatic. The flow and thermal fields are modeled by the continuity equation, the three momentum equations and the energy equation of the nanofluid with appropriate initial and boundary conditions using a cylindrical coordinate system. The nonlinear differential equations with partial derivatives are solved numerically by the finite volume method with a spatio-temporal discretization of the second order. The SIMPLER algorithm was used to solve the speed-pressure coupling. A complete parametric analysis on the effect of the presence of nanoparticles dispersed in the fluid such as volume fraction, type and shape on the development of thermal and hydrodynamic fields. The dimensionless control parameters that control the problem under consideration are the Reynolds number, the Prandtl number and the Grashof number, a radius ratio set to 2. For the volume fraction ranging from 0 to 10%, six nanoparticles Types, two metallic types Cu and Ag, three ceramics Al2O3, TiO2 and CuO. Also four forms of the nanoparticles are the shape the spherical shape, Blade, Cylinder, Platelet and Bricks shape. The study of these effects on heat transfer in a annular cylinder without fins and with fins is the main objective of this study. The results concerning the different cases studied for the effect of the volume fraction of the different nanofluids shows that the increase in the volume fraction increases the heat transfer along the annular duct. The axial and mean Nusselt numbers obtained are also higher in the case of the nanofluid (Ag / water). They also show that the use of the Ag nanoparticle induces a better improvement of the heat transfer followed by Cu, Al2O3, CuO at the end TiO2. Regarding the effect of the shape of the nanoparticles Blade shape greatly improves the heat transfer compared to other shapes. A generating correlation expresses the average Nusselt number for the different shapes as a function of the volume fraction proposed: Nu moy = a + bϕ + cϕ2. Another correlation which expresses the average Nusselt number of the nanofluid (TiO2/water) and the hybrid nanofluid (Ag-TiO2 / water) as a function of the number of Grashof, Prandtl and the volume fraction: The use of the heat-generating fins, attached longitudinally to the outer cylinder and immersed in the nanofluid, greatly improves the heat transfer compared to those of a nonfinned horizontal duct dû to the increase in the exchange area between The nanofluid and the fins in the annular space.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU7334.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10984 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7334 BEN/7334 Thèse Bibliothèque principale Thèses Disponible Intégration des énergies renouvelables pour le chauffage et la climatisation des bâtiments en utilisant les pompes à chaleur. / Meriem Khemici
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Titre : Intégration des énergies renouvelables pour le chauffage et la climatisation des bâtiments en utilisant les pompes à chaleur. Type de document : texte imprimé Auteurs : Meriem Khemici, Auteur ; Toufik Boufendi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 125 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: énergétique Convection Forcée et Mixte Cylindres concentriques et horizontaux Propriétés
physiques dépendent de la température Méthode des volumes finis Forced and Mixed Convection Concentric and horizontal cylinders Physical
properties depend on temperature finite volume method الحمل القسري والمختلط أسطوانات متحدة المركز و افقية الخصائص الفيزيائية
متعلقة بدرجة الحرارة طريقة الحجوم المنتهيةIndex. décimale : 530 Physique Résumé :
The mixed convection between two concentric horizontal cylinders with physical properties which depend on temperature is presented in this three-dimensional numerical study of laminar, viscous and incompressible flow. The fluid considered is water with a Prandtl number equal to 8.082 and its viscosity and thermal conductivity are considered variable functions of the temperature. The thermal conditions are as follows: a uniform volume heating produced by an internal source of energy in the thickness of the outer cylinder, while the inner cylinder is adiabatic. The mixed convection generated in the fluid, and the thermal conduction in the wall of the outer cylinder are at the origin of a conjugated thermal transfer. The thermal losses by radiation and convection towards the ambient are considered. The flow and thermal fields are modeled by the continuity equation, momentum and energy equations with appropriate initial and boundary conditions using a cylindrical coordinate system. The system of nonlinear partial differential equations is solved by a finite volume numerical method with second order accurate spatiotemporal discretizations. The mesh used in this study is 26 × 44 × 162 in the radial, azimuth and axial directions respectively. In this study, two adimensional control parameters are fixed: the Reynolds numbers, which indicates the flow dynamics, and the Prandtl number which is a physical characteristic of the fluid, are equal respectively, 373.28 and 8.082. While the geometric aspect ratio equal 277.77. By varying the number of Grashof, which indicate the effect of, buoyancy forces on the flow. We study its effects on the two modes of convection, forced and mixed. For geometric, dynamic and thermal control parameters considered, the results of the flows and thermal fields of forced convection and mixed convection with varying physical properties were presented and compared. The passage from forced convection to mixed convection completely changes the axisymmetric structure of thermal and dynamic fields; this change becomes more and more important by increasing the number of Grashof. For the Grashofs numbers studied, a secondary flow develops in the polar plane in the form of two contrarotating vortices, is always the cause of the circumferential variation of the temperature and in consequence, the physical properties of the fluid. The phenomenon of stratification of temperature is highlighted and the vortices obtained lead to an improvement of the heat transfer quantified by the increase of the number of Nusselt. The thermo-dependence of the properties is well evidenced with a stratified behavior in any polar plane and an axial variation more important for the viscosity than for the conductivity.Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHE7433.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11173 Intégration des énergies renouvelables pour le chauffage et la climatisation des bâtiments en utilisant les pompes à chaleur. [texte imprimé] / Meriem Khemici, Auteur ; Toufik Boufendi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 125 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: énergétique Convection Forcée et Mixte Cylindres concentriques et horizontaux Propriétés
physiques dépendent de la température Méthode des volumes finis Forced and Mixed Convection Concentric and horizontal cylinders Physical
properties depend on temperature finite volume method الحمل القسري والمختلط أسطوانات متحدة المركز و افقية الخصائص الفيزيائية
متعلقة بدرجة الحرارة طريقة الحجوم المنتهيةIndex. décimale : 530 Physique Résumé :
The mixed convection between two concentric horizontal cylinders with physical properties which depend on temperature is presented in this three-dimensional numerical study of laminar, viscous and incompressible flow. The fluid considered is water with a Prandtl number equal to 8.082 and its viscosity and thermal conductivity are considered variable functions of the temperature. The thermal conditions are as follows: a uniform volume heating produced by an internal source of energy in the thickness of the outer cylinder, while the inner cylinder is adiabatic. The mixed convection generated in the fluid, and the thermal conduction in the wall of the outer cylinder are at the origin of a conjugated thermal transfer. The thermal losses by radiation and convection towards the ambient are considered. The flow and thermal fields are modeled by the continuity equation, momentum and energy equations with appropriate initial and boundary conditions using a cylindrical coordinate system. The system of nonlinear partial differential equations is solved by a finite volume numerical method with second order accurate spatiotemporal discretizations. The mesh used in this study is 26 × 44 × 162 in the radial, azimuth and axial directions respectively. In this study, two adimensional control parameters are fixed: the Reynolds numbers, which indicates the flow dynamics, and the Prandtl number which is a physical characteristic of the fluid, are equal respectively, 373.28 and 8.082. While the geometric aspect ratio equal 277.77. By varying the number of Grashof, which indicate the effect of, buoyancy forces on the flow. We study its effects on the two modes of convection, forced and mixed. For geometric, dynamic and thermal control parameters considered, the results of the flows and thermal fields of forced convection and mixed convection with varying physical properties were presented and compared. The passage from forced convection to mixed convection completely changes the axisymmetric structure of thermal and dynamic fields; this change becomes more and more important by increasing the number of Grashof. For the Grashofs numbers studied, a secondary flow develops in the polar plane in the form of two contrarotating vortices, is always the cause of the circumferential variation of the temperature and in consequence, the physical properties of the fluid. The phenomenon of stratification of temperature is highlighted and the vortices obtained lead to an improvement of the heat transfer quantified by the increase of the number of Nusselt. The thermo-dependence of the properties is well evidenced with a stratified behavior in any polar plane and an axial variation more important for the viscosity than for the conductivity.Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHE7433.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11173 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité KHE/7433 KHE/7433 Thèse Bibliothèque principale Thèses Disponible

