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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 : https://bu.umc.edu.dz/md/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 : https://bu.umc.edu.dz/md/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 Étude numérique de la convection mixte en milieu poreux dans un canal contenant des composants électroniques / Lyes Boutina
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 : https://bu.umc.edu.dz/md/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 : https://bu.umc.edu.dz/md/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
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