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Partager le résultat de cette recherche Interroger des sources externesContribution a l’etude de la convection naturelle au sein d’un tube elliptique rempli d’un milieu poreux sature de fluide / Amel Labed
Titre : Contribution a l’etude de la convection naturelle au sein d’un tube elliptique rempli d’un milieu poreux sature de fluide Type de document : texte imprimé Auteurs : Amel Labed, Auteur ; Mahfoud Djezzar, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2012 Importance : 84 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : convection naturelle équations de Boussinesq milieu poreux espace annulaire elliptique Formulation vorticité-fonction de courant natural convection Boussinesq equations porous medium elliptical annulus Darcy flow model velocity-function formulation الحمل الطبيعي-مقاربةبوسينسك-وسط مسامي-فضاء حلقي اهليليجي-طريقة الحجوم المنتهية Index. décimale : 530 Physique Résumé : The purpose of the present paper is to analyze numerically the flow and heat transfer by steady laminar natural convection in a elliptical horizontal annulus filled with a Newtonian incompressible fluid saturated porous medium, with an isothermal inner and outer boundary. This study is carried out using the Darcy flow model, Boussinesq’s approximation and the vorticity-stream function formulation, the continuity and the momentum equations are expressed in a frame of reference known as "elliptic ", to facilitate the writing of the boundary conditions and to transform the curvilinear field into a rectangular field. A computer code was developed, using finite volume method. The stream lines and temperature distributions are presented and analyzed, examining the slope, geometric parameters and Rayleigh-Darcy effect. Diplôme : Magistère En ligne : ../theses/physique/LAB6321.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6288 Contribution a l’etude de la convection naturelle au sein d’un tube elliptique rempli d’un milieu poreux sature de fluide [texte imprimé] / Amel Labed, Auteur ; Mahfoud Djezzar, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2012 . - 84 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : convection naturelle équations de Boussinesq milieu poreux espace annulaire elliptique Formulation vorticité-fonction de courant natural convection Boussinesq equations porous medium elliptical annulus Darcy flow model velocity-function formulation الحمل الطبيعي-مقاربةبوسينسك-وسط مسامي-فضاء حلقي اهليليجي-طريقة الحجوم المنتهية Index. décimale : 530 Physique Résumé : The purpose of the present paper is to analyze numerically the flow and heat transfer by steady laminar natural convection in a elliptical horizontal annulus filled with a Newtonian incompressible fluid saturated porous medium, with an isothermal inner and outer boundary. This study is carried out using the Darcy flow model, Boussinesq’s approximation and the vorticity-stream function formulation, the continuity and the momentum equations are expressed in a frame of reference known as "elliptic ", to facilitate the writing of the boundary conditions and to transform the curvilinear field into a rectangular field. A computer code was developed, using finite volume method. The stream lines and temperature distributions are presented and analyzed, examining the slope, geometric parameters and Rayleigh-Darcy effect. Diplôme : Magistère En ligne : ../theses/physique/LAB6321.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6288 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité LAB/6321 LAB/6321 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
Titre : Etude hydrodynamique et thermique d’un écoulement en régime laminaire dans une conduite remplie par un milieu poreux. Type de document : texte imprimé Auteurs : Abdelkrim Bouaffane, Auteur ; Kamel Talbi, Directeur de thèse Mention d'édition : 21/12/2020 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2020 Importance : 108 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : milieu poreux convection forcée déséquilibre thermique local performance thermique modèle de Darcy- Brinkman- Forchheimer Porous medium forced convection local thermal non-equilibrium Thermal performance Darcy- Brinkman- Forchheimer model الحمل الحراري القسري المادة المسامية الأداء الحراري دارسي برينكمان فورشايمر Index. décimale : 620 Génie Mécanique Résumé :
The present work involves the thermal numerical simulation of laminar forced convection inside an annular pipe completely filled porous material. The DarcyBrinkman-Forcheimer- model is considered to describe the fluid transport in the porous media. The energy transport is simulated using the LTNE model: Local Thermal Non-Equilibrium between the fluid and the solid phases. The final form of the governing equations with their boundary conditions are transformed in dimensionless form and discretized by the finite volume method. SIMPLE algorithm was adopted to solve the set of algebraic discretized coupled equations. This work is divided in two parts: In the first part, the effect of the pertinent dimensionless parameters which govern the study such as Biot number (Bi), Reynolds number (Re), solid-fluid thermal conductivity ratio (Rc) and porosity ( ) on the LTNE intensity are analyzed by calculating the local difference of temperature (LDT) and the average difference of temperature DMT. The results show that the increase of Biot number and the solid-fluid thermal conductivity ratio, porosity and the decrease of Re reduces the LTNE intensity. The intensity of the LDT in the developing region is greater than that of the fully developed region. It is difficult to achieve a thermal equilibrium between the solid and fluid phases except in the case of high values of the Bio number. Therefore, the use of the thermal equilibrium model is not suitable in most cases. In the second part, the thermal performance is studied, the results illustrate that the increase of Bi, and Rc, and the decrease of porosity, Rr and Re represent good factors to improve the thermal performance.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7703.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11537 Etude hydrodynamique et thermique d’un écoulement en régime laminaire dans une conduite remplie par un milieu poreux. [texte imprimé] / Abdelkrim Bouaffane, Auteur ; Kamel Talbi, Directeur de thèse . - 21/12/2020 . - جامعة الإخوة منتوري قسنطينة, 2020 . - 108 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : milieu poreux convection forcée déséquilibre thermique local performance thermique modèle de Darcy- Brinkman- Forchheimer Porous medium forced convection local thermal non-equilibrium Thermal performance Darcy- Brinkman- Forchheimer model الحمل الحراري القسري المادة المسامية الأداء الحراري دارسي برينكمان فورشايمر Index. décimale : 620 Génie Mécanique Résumé :
The present work involves the thermal numerical simulation of laminar forced convection inside an annular pipe completely filled porous material. The DarcyBrinkman-Forcheimer- model is considered to describe the fluid transport in the porous media. The energy transport is simulated using the LTNE model: Local Thermal Non-Equilibrium between the fluid and the solid phases. The final form of the governing equations with their boundary conditions are transformed in dimensionless form and discretized by the finite volume method. SIMPLE algorithm was adopted to solve the set of algebraic discretized coupled equations. This work is divided in two parts: In the first part, the effect of the pertinent dimensionless parameters which govern the study such as Biot number (Bi), Reynolds number (Re), solid-fluid thermal conductivity ratio (Rc) and porosity ( ) on the LTNE intensity are analyzed by calculating the local difference of temperature (LDT) and the average difference of temperature DMT. The results show that the increase of Biot number and the solid-fluid thermal conductivity ratio, porosity and the decrease of Re reduces the LTNE intensity. The intensity of the LDT in the developing region is greater than that of the fully developed region. It is difficult to achieve a thermal equilibrium between the solid and fluid phases except in the case of high values of the Bio number. Therefore, the use of the thermal equilibrium model is not suitable in most cases. In the second part, the thermal performance is studied, the results illustrate that the increase of Bi, and Rc, and the decrease of porosity, Rr and Re represent good factors to improve the thermal performance.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7703.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11537 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7703 BOU/7703 Thèse Bibliothèque principale Thèses Disponible
Titre : Étude numérique de la convection mixte en milieu poreux dans un canal contenant des composants électroniques Type de document : texte imprimé Auteurs : Lyes Boutina, Auteur ; R. Bessaih, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2014 Importance : 115 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Convection mixte Canal Refroidissement à air Composants électroniques milieux poreux mixed convection channel air-cooling electronic components porous medium الحمل المزدوج قناة تبريد بالهواء المصفوفة المسامية Index. décimale : 620 Génie Mécanique Résumé :
A numerical study of laminar mixed convection air-cooling of two identical heat sources enveloped by a porous matrix has been presented in this work. The flow field is governed by the Navier–Stokes equations in the fluid region, the Darcy–Brinkman–Forchheimer model in the porous region, and the thermal field by the energy equation. The numerical calculation was carried out using the software ""FLUENT"", based on the finite volume method.
The first application is to examine the effects of the Reynolds number, the inclination angle, the size of electronic components and the space between them on the heat transfer inside a two-dimensional (2D) vertical channel. The results show that increasing of the Reynolds number and the separation distance can enhance the cooling of electronic components. For an inclinaison angle (α = 45 °), the maximum heat transfer was obtained. For the second application, we have considered a two-dimensional (2D) vertical channel, containing two electronic components wrapped by a porous matrix. The effects of the Reynolds number, the inclination angle, the Darcy number, the thickness of the porous layer and their conductivity have been examined. The results show that the thickness of the porous matrix improves the cooling of electronic components inside the channel, about 60% higher compared to the case without integration of the porous matrix. The increase of the Darcy number (10-3 ≤ Da ≤ 10-6) causes a decrease of the maximum temperature in the channel, which contributes to the cooling of electronic components. The insertion of the porous matrix with a thermal conductivity in the range ke/kf ≤ 50 improves the cooling of heat sources. For the third application, we have considered a three-dimensional (3D) vertical channel, containing two electronic components wrapped by a porous matrix. The effects of the Reynolds number, the Darcy number and the thickness of the porous layer have been examined. The results show that proper cooling of electronic components is obtained for a channel completely filled with a porous matrix with high thermal conductivity (ke / kf = 100), with Re = 200 and Gr = 104 ( Ri = Gr/Re2=0.25) and for all values of the Darcy number (10-3 ≤ Da ≤ 10-6).Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6604.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9717 Étude numérique de la convection mixte en milieu poreux dans un canal contenant des composants électroniques [texte imprimé] / Lyes Boutina, Auteur ; R. Bessaih, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2014 . - 115 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Convection mixte Canal Refroidissement à air Composants électroniques milieux poreux mixed convection channel air-cooling electronic components porous medium الحمل المزدوج قناة تبريد بالهواء المصفوفة المسامية Index. décimale : 620 Génie Mécanique Résumé :
A numerical study of laminar mixed convection air-cooling of two identical heat sources enveloped by a porous matrix has been presented in this work. The flow field is governed by the Navier–Stokes equations in the fluid region, the Darcy–Brinkman–Forchheimer model in the porous region, and the thermal field by the energy equation. The numerical calculation was carried out using the software ""FLUENT"", based on the finite volume method.
The first application is to examine the effects of the Reynolds number, the inclination angle, the size of electronic components and the space between them on the heat transfer inside a two-dimensional (2D) vertical channel. The results show that increasing of the Reynolds number and the separation distance can enhance the cooling of electronic components. For an inclinaison angle (α = 45 °), the maximum heat transfer was obtained. For the second application, we have considered a two-dimensional (2D) vertical channel, containing two electronic components wrapped by a porous matrix. The effects of the Reynolds number, the inclination angle, the Darcy number, the thickness of the porous layer and their conductivity have been examined. The results show that the thickness of the porous matrix improves the cooling of electronic components inside the channel, about 60% higher compared to the case without integration of the porous matrix. The increase of the Darcy number (10-3 ≤ Da ≤ 10-6) causes a decrease of the maximum temperature in the channel, which contributes to the cooling of electronic components. The insertion of the porous matrix with a thermal conductivity in the range ke/kf ≤ 50 improves the cooling of heat sources. For the third application, we have considered a three-dimensional (3D) vertical channel, containing two electronic components wrapped by a porous matrix. The effects of the Reynolds number, the Darcy number and the thickness of the porous layer have been examined. The results show that proper cooling of electronic components is obtained for a channel completely filled with a porous matrix with high thermal conductivity (ke / kf = 100), with Re = 200 and Gr = 104 ( Ri = Gr/Re2=0.25) and for all values of the Darcy number (10-3 ≤ Da ≤ 10-6).Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6604.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9717 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6604 BOU/6604 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégreAdobe Acrobat PDF
Titre : Simulation numérique de la convection naturelle dans une cavité carrée poreuse Type de document : texte imprimé Auteurs : Esma Belahmadi, Auteur ; Smail Benissaad, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 84 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Natural convection finite volumes porous medium Convection naturelle Volumes finis Milieu poreux الحمل الحراري الطبیعي كمیات محدودة والمتوسطة التي يسهل اختراقها Index. décimale : 620 Génie Mécanique Résumé : In this work, we present a numerical study of two-dimensional and steady flow of a fluid generated by a temperature gradient in a porous square cavity. The vertical walls of the enclosure are maintained isotherms, whose left wall at a warm temperature (Th) and the
right wall at a cold temperature (Tc), while the horizontal walls (upper and lower) are adiabatic. A Fortran code based on the finite volume method and the SIMPLER algorithm was used to solve the equations that govern physical phenomena. The results are validated with previous results found in the literature, and presented in graphical form. The effects of the Grashof Gr, Darcy Da and Prandlt Pr numbers, porosity e, size and position of the heat source are studied. The results show that increasing the dimensionless parameters (Gr,Da, Pr, e) improve the heat transfer rate, but increase the entropy generation in the cavity.
Also, the Nusselt number is higher for a length greater of the heater, contrary, the total entropy is low when the size of the heating element is small. Finally, the heat transfer rate in the cavity is much higher in the case where the position of the heat source is in the middle of
the wall, but the total entropy is small when the heat source is positioned in the section of the upper wall.Diplôme : Magistère En ligne : ../theses/gmecanique/BEL6418.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9452 Simulation numérique de la convection naturelle dans une cavité carrée poreuse [texte imprimé] / Esma Belahmadi, Auteur ; Smail Benissaad, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 84 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Natural convection finite volumes porous medium Convection naturelle Volumes finis Milieu poreux الحمل الحراري الطبیعي كمیات محدودة والمتوسطة التي يسهل اختراقها Index. décimale : 620 Génie Mécanique Résumé : In this work, we present a numerical study of two-dimensional and steady flow of a fluid generated by a temperature gradient in a porous square cavity. The vertical walls of the enclosure are maintained isotherms, whose left wall at a warm temperature (Th) and the
right wall at a cold temperature (Tc), while the horizontal walls (upper and lower) are adiabatic. A Fortran code based on the finite volume method and the SIMPLER algorithm was used to solve the equations that govern physical phenomena. The results are validated with previous results found in the literature, and presented in graphical form. The effects of the Grashof Gr, Darcy Da and Prandlt Pr numbers, porosity e, size and position of the heat source are studied. The results show that increasing the dimensionless parameters (Gr,Da, Pr, e) improve the heat transfer rate, but increase the entropy generation in the cavity.
Also, the Nusselt number is higher for a length greater of the heater, contrary, the total entropy is low when the size of the heating element is small. Finally, the heat transfer rate in the cavity is much higher in the case where the position of the heat source is in the middle of
the wall, but the total entropy is small when the heat source is positioned in the section of the upper wall.Diplôme : Magistère En ligne : ../theses/gmecanique/BEL6418.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9452 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/6418 BEL/6418 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
Titre : Transfert convectif dans une cavité totalement ou partiellement occupée par une matrice poreuse en ETL ou HETL Type de document : texte imprimé Auteurs : Abderrahim Bourouis, Auteur ; Abdeslam Omara, Auteur Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 131 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Physique Energétique Convection Mixte Conjuguée Convection Naturelle Milieu Poreux Hors Équilibre Thermique Local Phase Solide Phase Fluide Volumes Finis Conjugate Mixed Convection Natural Convection Porous Medium Local Thermal non Equilibrium Solid Phase Fluid Phase Finite-Volume Method حمل حراري مختلط حمل حراري طبیعي وسط مسامي عدم التوازن الحراري الموضعي طور مائع طور صلب الحجوم المنتھیة Index. décimale : 530 Physique Résumé : In this work, a numerical study of convective heat transfer in confined fluid and porous media was considered. The fluid flow is governed by the Navier–Stokes equations in the fluid region whereas the Darcy–Brinkman–Forchheimer model in the porous region. The finite volume method is used in order to discrete the governing equations, and the SIMPLE algorithm is used to treat the coupling pressure-velocity.
Initially, the first application is to examine the effects of the Richardson number (Ri = 0.1, 1, 10) and thermal conductivity ratio (Rk = 0.1, 1, 10, 100) on the heat transfer by conjugate mixed convection and conduction in a lid-driven enclosure with thick vertical porous layer. The left vertical moving wall of enclosure takes two different directions, (upward or downward moving wall). In this study, the compression of isotherms in the porous layer is observed at low conductivity ratio, while at large conductivity ratio, isotherms span the fluid filled part of the enclosure. It is also observed that average Nusselt numbers along the right hot wall and along the fluid-porous layer interface tend to zero at large and low thermal conductivity ratio, respectively.
For the second application, we have considered a thermal non-equilibrium approach on
natural convection in a square porous cavity with partial active vertical walls. Depending on the location of hot part and cold part, respectively on the left and right side walls, two cases are considered: Upper-Lower and Lower-Upper active walls. The two equations model is used to take into account separately local temperatures of the fluid and the solid. The effect of the Rayleigh number, Darcy number, inter-phase heat transfer coefficient and modified conductivity ratio is examined. The obtained results reveal that the location of the hot and cold parts on the vertical side walls has a significant influence on the flow structure and the rate of heat transfer within the enclosure.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU6987.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10407 Transfert convectif dans une cavité totalement ou partiellement occupée par une matrice poreuse en ETL ou HETL [texte imprimé] / Abderrahim Bourouis, Auteur ; Abdeslam Omara, Auteur . - جامعة الإخوة منتوري قسنطينة, 2016 . - 131 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Physique Energétique Convection Mixte Conjuguée Convection Naturelle Milieu Poreux Hors Équilibre Thermique Local Phase Solide Phase Fluide Volumes Finis Conjugate Mixed Convection Natural Convection Porous Medium Local Thermal non Equilibrium Solid Phase Fluid Phase Finite-Volume Method حمل حراري مختلط حمل حراري طبیعي وسط مسامي عدم التوازن الحراري الموضعي طور مائع طور صلب الحجوم المنتھیة Index. décimale : 530 Physique Résumé : In this work, a numerical study of convective heat transfer in confined fluid and porous media was considered. The fluid flow is governed by the Navier–Stokes equations in the fluid region whereas the Darcy–Brinkman–Forchheimer model in the porous region. The finite volume method is used in order to discrete the governing equations, and the SIMPLE algorithm is used to treat the coupling pressure-velocity.
Initially, the first application is to examine the effects of the Richardson number (Ri = 0.1, 1, 10) and thermal conductivity ratio (Rk = 0.1, 1, 10, 100) on the heat transfer by conjugate mixed convection and conduction in a lid-driven enclosure with thick vertical porous layer. The left vertical moving wall of enclosure takes two different directions, (upward or downward moving wall). In this study, the compression of isotherms in the porous layer is observed at low conductivity ratio, while at large conductivity ratio, isotherms span the fluid filled part of the enclosure. It is also observed that average Nusselt numbers along the right hot wall and along the fluid-porous layer interface tend to zero at large and low thermal conductivity ratio, respectively.
For the second application, we have considered a thermal non-equilibrium approach on
natural convection in a square porous cavity with partial active vertical walls. Depending on the location of hot part and cold part, respectively on the left and right side walls, two cases are considered: Upper-Lower and Lower-Upper active walls. The two equations model is used to take into account separately local temperatures of the fluid and the solid. The effect of the Rayleigh number, Darcy number, inter-phase heat transfer coefficient and modified conductivity ratio is examined. The obtained results reveal that the location of the hot and cold parts on the vertical side walls has a significant influence on the flow structure and the rate of heat transfer within the enclosure.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BOU6987.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10407 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6987 BOU/6987 Thèse Bibliothèque principale Thèses Disponible
