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Partager le résultat de cette recherche Interroger des sources externesGénération d’entropie due au refroidissement par convection naturelle d’un nanofluide / Abd el malik Bouchoucha
Titre : Génération d’entropie due au refroidissement par convection naturelle d’un nanofluide Type de document : texte imprimé Auteurs : Abd el malik Bouchoucha, Auteur ; Rachid Bessaih, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 159 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Nanofluide Génération d’entropie Convection naturelle Cavité Nanofluid Entropy generation Natural convection Cavity محلول نانوني توليد ا ألنتروبي الحمل الحراري الطبيعي وعاء Index. décimale : 620 Génie Mécanique Résumé : Venous thromboembolism (VTE) is a multifactorial disease in which the genetic
component is important.Many genetic risk factors have been identified for causing VTE.
Most of them affect the function of natural anticoagulant pathways, particularly the prote
Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU7046.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10553 Génération d’entropie due au refroidissement par convection naturelle d’un nanofluide [texte imprimé] / Abd el malik Bouchoucha, Auteur ; Rachid Bessaih, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 159 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Nanofluide Génération d’entropie Convection naturelle Cavité Nanofluid Entropy generation Natural convection Cavity محلول نانوني توليد ا ألنتروبي الحمل الحراري الطبيعي وعاء Index. décimale : 620 Génie Mécanique Résumé : Venous thromboembolism (VTE) is a multifactorial disease in which the genetic
component is important.Many genetic risk factors have been identified for causing VTE.
Most of them affect the function of natural anticoagulant pathways, particularly the prote
Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU7046.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10553 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7046 BOU/7046 Thèse Bibliothèque principale Thèses Disponible
Titre : Contribution à l’étude des transferts thermiques dans les nanofluides. Type de document : texte imprimé Auteurs : Ahlam Ghennai, Auteur ; Rachid Bessaih, Directeur de thèse Mention d'édition : 07/06/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 136 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : G.Mécanique: Energétique Transfert thermique simulation numérique cavité canal nanofluides génération d’entropie modèle de mélange
Heat transfer numerical simulation cavity channel nanofluids entropy generation mixture model الحمل الحراري المحاكاة العددية التجويف القناة الموائع النانوية توليد الإنتروبيا نموذج الخليطIndex. décimale : 620 Génie Mécanique Résumé :
This thesis deals with the numerical modelling of laminar natural and mixed convection flows of different anofluids types. Numerical simulations were performed using Ansysfluent software, considering three configurations: the square cavity, the cubic cavity, and the inclined channel. The numerical results obtained were validated with those found in the literature. A good agreement was obtained. We present three parts grouping the treated configurations: The first part concerns the study of 2-D natural convection in a square cavity equipped with a pentagonal obstacle, filled with a nanofluid (Cu/Water). The effects of the Rayleigh number Ra, the volumetric concentration of nanoparticles , the aspect ratio r and the orientation of the block were discussed The second part examines the 3-D mixed convection inside a cubic cavity with a heated square-section obstacle. This study compares the single carbon nanotube CNT/water nanofluid and the hybrid CNT-Copper/water nanofluid with different concentration ratios, Richardson number Ri, Reynolds number Re, and block aspect ratio r. In this case, three correlations have been developed to predict the average Nusselt number Nu's variation as a function of the chosen parameters. The third part deals with the numerical study of laminar mixed convection with entropy generation in an inclined channel with four heated blocks, traversed by a hybrid Al2O3- Cu/water nanofluid. In this part, the use of a two-phase mixing model approach was considered to demonstrate the effects of several parameters such as Ri, Re, , θ (the channel tilt), and the position of the block on Nusselt number, entropy generations, and Bejan number. Two different correlations were also determined to express Nu's average values for the position of aligned and non-aligned blocks.
Diplôme : Doctorat En ligne : ../theses/gmecanique/GHE7758.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11591 Contribution à l’étude des transferts thermiques dans les nanofluides. [texte imprimé] / Ahlam Ghennai, Auteur ; Rachid Bessaih, Directeur de thèse . - 07/06/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 136 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : G.Mécanique: Energétique Transfert thermique simulation numérique cavité canal nanofluides génération d’entropie modèle de mélange
Heat transfer numerical simulation cavity channel nanofluids entropy generation mixture model الحمل الحراري المحاكاة العددية التجويف القناة الموائع النانوية توليد الإنتروبيا نموذج الخليطIndex. décimale : 620 Génie Mécanique Résumé :
This thesis deals with the numerical modelling of laminar natural and mixed convection flows of different anofluids types. Numerical simulations were performed using Ansysfluent software, considering three configurations: the square cavity, the cubic cavity, and the inclined channel. The numerical results obtained were validated with those found in the literature. A good agreement was obtained. We present three parts grouping the treated configurations: The first part concerns the study of 2-D natural convection in a square cavity equipped with a pentagonal obstacle, filled with a nanofluid (Cu/Water). The effects of the Rayleigh number Ra, the volumetric concentration of nanoparticles , the aspect ratio r and the orientation of the block were discussed The second part examines the 3-D mixed convection inside a cubic cavity with a heated square-section obstacle. This study compares the single carbon nanotube CNT/water nanofluid and the hybrid CNT-Copper/water nanofluid with different concentration ratios, Richardson number Ri, Reynolds number Re, and block aspect ratio r. In this case, three correlations have been developed to predict the average Nusselt number Nu's variation as a function of the chosen parameters. The third part deals with the numerical study of laminar mixed convection with entropy generation in an inclined channel with four heated blocks, traversed by a hybrid Al2O3- Cu/water nanofluid. In this part, the use of a two-phase mixing model approach was considered to demonstrate the effects of several parameters such as Ri, Re, , θ (the channel tilt), and the position of the block on Nusselt number, entropy generations, and Bejan number. Two different correlations were also determined to express Nu's average values for the position of aligned and non-aligned blocks.
Diplôme : Doctorat En ligne : ../theses/gmecanique/GHE7758.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11591 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité GHE/7758 GHE/7758 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude de la convection mixte dans des cavités. Type de document : texte imprimé Auteurs : Ilhem Zeghbid, Auteur ; R. Bessaih, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 172 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Mixed convection Cavities Entropy generation Nanofluid Convection mixte Cavités Génération d’entropie Nanofluide وليد الكون الحمل الحراري مختلط تجاويف Index. décimale : 620 Génie Mécanique Résumé : The aim of this work is to study numerically the laminar mixed convection and
entropy generation in cavities. The calculations were performed for water (Cu, Ag)
metallic nanofluids and water-(AlO3, TiO2) metal oxides. The fluids are supposed
incompressible and Newtonian. The equations governing the flow and heat transfer have
been solved using the finite volume method. A house code in FORTRAN has been
developed to calculate the flow and temperature fields, the Nusselt number, and the
entropy generation. The effects of Rayleigh and Reynolds numbers , the volume fraction
of the nanofluid, the nanofluid type, and the position of the heat sources on the flow and
thermal fields, the average Nusselt number, entropy generation, and the Bejan number
are studied in detail. The results show that the use of nanofluids improves heat transfer
and reduces the entropy generation. Finally, a three-dimensional numerical study of
laminar forced convection in a cubic cavity filled with different nanofluids is presented.
In this study, the Ansys-Fluent 14 software was used to solve the equations of the
problem in questionDiplôme : Doctorat en sciences En ligne : ../theses/gmecanique/ZEG7096.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10508 Etude de la convection mixte dans des cavités. [texte imprimé] / Ilhem Zeghbid, Auteur ; R. Bessaih, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 172 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Mixed convection Cavities Entropy generation Nanofluid Convection mixte Cavités Génération d’entropie Nanofluide وليد الكون الحمل الحراري مختلط تجاويف Index. décimale : 620 Génie Mécanique Résumé : The aim of this work is to study numerically the laminar mixed convection and
entropy generation in cavities. The calculations were performed for water (Cu, Ag)
metallic nanofluids and water-(AlO3, TiO2) metal oxides. The fluids are supposed
incompressible and Newtonian. The equations governing the flow and heat transfer have
been solved using the finite volume method. A house code in FORTRAN has been
developed to calculate the flow and temperature fields, the Nusselt number, and the
entropy generation. The effects of Rayleigh and Reynolds numbers , the volume fraction
of the nanofluid, the nanofluid type, and the position of the heat sources on the flow and
thermal fields, the average Nusselt number, entropy generation, and the Bejan number
are studied in detail. The results show that the use of nanofluids improves heat transfer
and reduces the entropy generation. Finally, a three-dimensional numerical study of
laminar forced convection in a cubic cavity filled with different nanofluids is presented.
In this study, the Ansys-Fluent 14 software was used to solve the equations of the
problem in questionDiplôme : Doctorat en sciences En ligne : ../theses/gmecanique/ZEG7096.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10508 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ZEG/7096 ZEG/7096 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude numérique des transferts thermiques convectifs avec nano-fluides. Type de document : texte imprimé Auteurs : Esma Belahmadi, Auteur ; Rachid Bessaih, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 148 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Transfert de chaleur convectif Nanofluide Génération d’entropie Convective heat transfer Nanofluid Entropy generation نقل حرارة الحمل الحراري النانوفلويد (Nanofluide) توليد الانتروبي Index. décimale : 620 Génie Mécanique Résumé : In this work, we present the study of convective heat transfers with nanofluid and entropy generation inside three selected configurations. Two computational codes (AnsysFluent 14 and house-Fortran) were used to solve the partial differential equations describing natural convection and mixed laminar flows. Numerical results obtained by these codes were validated with those found in the literature, and a good agreement was obtained. The study presented in this thesis is divided into three parts.
The first part of this study is devoted to two-dimensional flow in a vertical channel with parallel plates traversed by a Cu-water nanofluid. The effects of Reynolds and Grashof numbers, and the nanofluid solid volume fraction on heat transfer and entropy generation are examined in detail. The results show that increasing the nanoparticle volume fraction and dimensionless numbers (Re, Gr) improves the heat transfer rate and decreases the
entropy generation in the channel.
The second part presents the axisymmetric flow of an Al2O3-water nanofluid between two vertical coaxial cylinders. The effects of Rayleigh, Hartmann numbers, inclination angle and solid volume fraction of nanoparticles on heat transfer and entropy generation are studied in detail. Results reveal that the heat transfer and entropy generation rates depend on the intensity and orientation of the magnetic field. In addition,
in all cases, the average Nusselt number and the total entropy generation increase by increasing the Rayleigh number and the volume fraction of nanoparticles.
The third part is based on heat transfer, stready state, in a horizontal cylindrical duct, traversed by a three-dimensional flow of a nanofluid subjected to a heat flux to the wall. The effects of Richardson and Hartmann numbers, solid volume fraction of the nanofluid, and the direction of the magnetic field on heat transfer and entropy generation are examined in detail. The results indicate that the heat transfer and entropy generation
rates depend on the intensity and direction of the magnetic field. In addition, the increase in the number of Richardson and the volume fraction of nanoparticles increases heat transfer and entropy generation. Finally, the application of a radial magnetic field promotes a better convective heat exchange and minimizes the entropy generation.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BEL7268.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10886 Etude numérique des transferts thermiques convectifs avec nano-fluides. [texte imprimé] / Esma Belahmadi, Auteur ; Rachid Bessaih, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 148 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Transfert de chaleur convectif Nanofluide Génération d’entropie Convective heat transfer Nanofluid Entropy generation نقل حرارة الحمل الحراري النانوفلويد (Nanofluide) توليد الانتروبي Index. décimale : 620 Génie Mécanique Résumé : In this work, we present the study of convective heat transfers with nanofluid and entropy generation inside three selected configurations. Two computational codes (AnsysFluent 14 and house-Fortran) were used to solve the partial differential equations describing natural convection and mixed laminar flows. Numerical results obtained by these codes were validated with those found in the literature, and a good agreement was obtained. The study presented in this thesis is divided into three parts.
The first part of this study is devoted to two-dimensional flow in a vertical channel with parallel plates traversed by a Cu-water nanofluid. The effects of Reynolds and Grashof numbers, and the nanofluid solid volume fraction on heat transfer and entropy generation are examined in detail. The results show that increasing the nanoparticle volume fraction and dimensionless numbers (Re, Gr) improves the heat transfer rate and decreases the
entropy generation in the channel.
The second part presents the axisymmetric flow of an Al2O3-water nanofluid between two vertical coaxial cylinders. The effects of Rayleigh, Hartmann numbers, inclination angle and solid volume fraction of nanoparticles on heat transfer and entropy generation are studied in detail. Results reveal that the heat transfer and entropy generation rates depend on the intensity and orientation of the magnetic field. In addition,
in all cases, the average Nusselt number and the total entropy generation increase by increasing the Rayleigh number and the volume fraction of nanoparticles.
The third part is based on heat transfer, stready state, in a horizontal cylindrical duct, traversed by a three-dimensional flow of a nanofluid subjected to a heat flux to the wall. The effects of Richardson and Hartmann numbers, solid volume fraction of the nanofluid, and the direction of the magnetic field on heat transfer and entropy generation are examined in detail. The results indicate that the heat transfer and entropy generation
rates depend on the intensity and direction of the magnetic field. In addition, the increase in the number of Richardson and the volume fraction of nanoparticles increases heat transfer and entropy generation. Finally, the application of a radial magnetic field promotes a better convective heat exchange and minimizes the entropy generation.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BEL7268.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10886 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7268 BEL/7268 Thèse Bibliothèque principale Thèses Disponible
