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Auteur Rachid Bessaih |
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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 : 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 : Effet thèrmique d'un craque mécanique dans un micro- processeur Type de document : texte imprimé Auteurs : Rachid Bessaih ; Univ. de Constantine, Éditeur scientifique ; M. Afrid, Directeur de thèse Année de publication : 1994 Importance : 121 f. Note générale : 01 Disponible au magasin de la bibliothèque centrale Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Craque Index. décimale : 620 Génie Mécanique Permalink : index.php?lvl=notice_display&id=840 Effet thèrmique d'un craque mécanique dans un micro- processeur [texte imprimé] / Rachid Bessaih ; Univ. de Constantine, Éditeur scientifique ; M. Afrid, Directeur de thèse . - 1994 . - 121 f.
01 Disponible au magasin de la bibliothèque centrale
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Craque Index. décimale : 620 Génie Mécanique Permalink : index.php?lvl=notice_display&id=840 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BES/2560 BES/2560 Thèse Bibliothèque principale Thèses Disponible Étude du comportement dynamique Du transfert de chaleur et de masse d'un réacteur de métal-hydrogène fermé / Ali Boukhari
Titre : Étude du comportement dynamique Du transfert de chaleur et de masse d'un réacteur de métal-hydrogène fermé Type de document : texte imprimé Auteurs : Ali Boukhari, Auteur ; Rachid Bessaih, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 115 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Stockage d’hydrogène Réacteur à lit absorbant Hydrure de métal Simulation
numérique Transferts de chaleur et de masse couplés Hydrogen storage Packed bed reactor Metal hydride Numerical simulation Coupled
heat and mass transfer تخزین الھیدروجین مفاعل مغلق ھیدرید-المعادن المحاكاة العددیة انتقال الحرارة والمادةIndex. décimale : 620 Génie Mécanique Résumé : The purpose of this work is to numerically study the dynamic behavior of heat and mass
transfer in an annulus-disc metal hydride reactor used for hydrogen solid storage. A twodimensional mathematical model of a simple geometry consisting of the equations governing the phenomenon of hydrogen storage has been proposed, in which the Navier-Stokes equations were used in addition of the source term with the Forchheimer’s modification, to adequately describe fluid flow in the packed bed considered as porous medium. The equations of continuity, momentum and energy were solved using the finite volume method; by accommodating the commercial code ANSYS FLUENT through user-defined functions (UDF), to numerically solve the equations governing the sorption processes studied.
The numerical model results were compared to experimental results reported in the literature for the case of a simple regular geometry. A good agreement was found between present calculations results and experimental data.
Numerical simulations have shown that the pressure drop in the metal hydride packed bed
caused by the fluid inertia can be considerable in this flow type. Moreover, the hydrogen sorption time depends on the configuration and geometrical dimensions of the heat exchange device. Thus, the minimization of absorption or desorption time is reduced to the reliability of the heat exchange process in the packed bed reactor. In addition, the conductivity is a key factor in the efficient design of the metal hydride reactors.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6817.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10086 Étude du comportement dynamique Du transfert de chaleur et de masse d'un réacteur de métal-hydrogène fermé [texte imprimé] / Ali Boukhari, Auteur ; Rachid Bessaih, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 115 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Stockage d’hydrogène Réacteur à lit absorbant Hydrure de métal Simulation
numérique Transferts de chaleur et de masse couplés Hydrogen storage Packed bed reactor Metal hydride Numerical simulation Coupled
heat and mass transfer تخزین الھیدروجین مفاعل مغلق ھیدرید-المعادن المحاكاة العددیة انتقال الحرارة والمادةIndex. décimale : 620 Génie Mécanique Résumé : The purpose of this work is to numerically study the dynamic behavior of heat and mass
transfer in an annulus-disc metal hydride reactor used for hydrogen solid storage. A twodimensional mathematical model of a simple geometry consisting of the equations governing the phenomenon of hydrogen storage has been proposed, in which the Navier-Stokes equations were used in addition of the source term with the Forchheimer’s modification, to adequately describe fluid flow in the packed bed considered as porous medium. The equations of continuity, momentum and energy were solved using the finite volume method; by accommodating the commercial code ANSYS FLUENT through user-defined functions (UDF), to numerically solve the equations governing the sorption processes studied.
The numerical model results were compared to experimental results reported in the literature for the case of a simple regular geometry. A good agreement was found between present calculations results and experimental data.
Numerical simulations have shown that the pressure drop in the metal hydride packed bed
caused by the fluid inertia can be considerable in this flow type. Moreover, the hydrogen sorption time depends on the configuration and geometrical dimensions of the heat exchange device. Thus, the minimization of absorption or desorption time is reduced to the reliability of the heat exchange process in the packed bed reactor. In addition, the conductivity is a key factor in the efficient design of the metal hydride reactors.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU6817.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10086 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6817 BOU/6817 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude de la convection naturelle laminaire et turbulente dans des enceintes Type de document : texte imprimé Auteurs : Rachid Bessaih ; Univ. de Constantine, Éditeur scientifique ; M. Kadja, Directeur de thèse Année de publication : 2000 Note générale : 1 Disponible à la salle de recherche
2 Disponibles au magasin de la bibliothèque centraleLangues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Turbulence Convection naturelle Ecoulement tournant Enceintes Champs magnétique Solutions numérique et analytique Index. décimale : 620 Génie Mécanique Permalink : index.php?lvl=notice_display&id=747 Etude de la convection naturelle laminaire et turbulente dans des enceintes [texte imprimé] / Rachid Bessaih ; Univ. de Constantine, Éditeur scientifique ; M. Kadja, Directeur de thèse . - 2000.
1 Disponible à la salle de recherche
2 Disponibles au magasin de la bibliothèque centrale
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Turbulence Convection naturelle Ecoulement tournant Enceintes Champs magnétique Solutions numérique et analytique Index. décimale : 620 Génie Mécanique Permalink : index.php?lvl=notice_display&id=747 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BES/3339 BES/3339 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude Numérique des Transferts de Chaleur onjugués Lors du Refroidissement des Sources de Chaleur Type de document : texte imprimé Auteurs : Amin Bouraoui, Auteur ; Rachid Bessaih, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 166 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Convection naturelle Transfert conjugué Enceinte Simulation Régime
permanent Régime transitoire Natural convection Conjugate heat transfer Enclosure Steady state Transient regime لحمل الحراري الطبيعي ونقل المرتبط شكل معلب محاكاة الحالة
الثابتة الحالة الغير مستقرIndex. décimale : 620 Génie Mécanique Résumé :
We treat the problem related to heat transfer by natural convection through a three-dimensional numerical simulation study of two identical blocks heated and separated by a distance d, simulating the air cooling (assumed incompressible Newtonian) electronic components in a cuboid cavity . Each block is maintained at a temperature Tc (hot), which varies depending on the Rayleigh number, in the center of the bottom wall of the enclosure, the remainder of the surface is assumed adiabatic, while the other walls are maintained at a constant temperature Tf (cold).
The presentation of the physical model is translated into mathematical equations in the form of partial derivatives (E.D.P), which regulates the transport of energy by molecular motion in the cavity. Based on certain assumptions for which these equations are valid, these mathematical expressions mainly include fundamental laws: conservation of mass, momentum, and energy. According to the complex nature of these equations (nonlinear and coupling velocity-pressure), we are facing the numerical resolution. In this context, a computer code was developed at the base of Fortran language, and validated by the work found in the literature.
In the first part, our effort is focused on the laminar flow trying to clear the influence of the effects of the Rayleigh number, spacing, and aspect ratio of the length and the width components of the physical behavior of fluid, such as the flow and heat fields. In the second part, the transitional arrangements made in our study through early detection of hydrodynamic and thermal instabilities, however, we discuss the spacing influence, reports form the length and the width components of the flow bifurcation.
Finally, stability diagrams were established according to these parameters.
Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU6935.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10287 Etude Numérique des Transferts de Chaleur onjugués Lors du Refroidissement des Sources de Chaleur [texte imprimé] / Amin Bouraoui, Auteur ; Rachid Bessaih, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 166 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Convection naturelle Transfert conjugué Enceinte Simulation Régime
permanent Régime transitoire Natural convection Conjugate heat transfer Enclosure Steady state Transient regime لحمل الحراري الطبيعي ونقل المرتبط شكل معلب محاكاة الحالة
الثابتة الحالة الغير مستقرIndex. décimale : 620 Génie Mécanique Résumé :
We treat the problem related to heat transfer by natural convection through a three-dimensional numerical simulation study of two identical blocks heated and separated by a distance d, simulating the air cooling (assumed incompressible Newtonian) electronic components in a cuboid cavity . Each block is maintained at a temperature Tc (hot), which varies depending on the Rayleigh number, in the center of the bottom wall of the enclosure, the remainder of the surface is assumed adiabatic, while the other walls are maintained at a constant temperature Tf (cold).
The presentation of the physical model is translated into mathematical equations in the form of partial derivatives (E.D.P), which regulates the transport of energy by molecular motion in the cavity. Based on certain assumptions for which these equations are valid, these mathematical expressions mainly include fundamental laws: conservation of mass, momentum, and energy. According to the complex nature of these equations (nonlinear and coupling velocity-pressure), we are facing the numerical resolution. In this context, a computer code was developed at the base of Fortran language, and validated by the work found in the literature.
In the first part, our effort is focused on the laminar flow trying to clear the influence of the effects of the Rayleigh number, spacing, and aspect ratio of the length and the width components of the physical behavior of fluid, such as the flow and heat fields. In the second part, the transitional arrangements made in our study through early detection of hydrodynamic and thermal instabilities, however, we discuss the spacing influence, reports form the length and the width components of the flow bifurcation.
Finally, stability diagrams were established according to these parameters.
Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU6935.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10287 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6935 BOU/6935 Thèse Bibliothèque principale Thèses Disponible Permalink
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