Rozprawy doktorskie na temat „Propriétés d'écoulement”
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Collet, Jean-François. "Quelques propriétés mathématiques d'un modèle d'écoulement en milieu poreux". Lyon 1, 1993. http://www.theses.fr/1993LYO10237.
Pełny tekst źródłaPetrova-Bensalem, Roumania. "Étude des propriétés d'écoulement des bruts asphalténiques en milieu poreux". Lyon 1, 1998. http://www.theses.fr/1998LYO10104.
Pełny tekst źródłaDe, Dreuzy Jean-Raynald. "Analyse des propriétés hydrauliquesdes réseaux de fracturesDiscussion des modèles d'écoulement compatiblesavec les principales propriétés géométriques". Phd thesis, Université Rennes 1, 1999. http://tel.archives-ouvertes.fr/tel-00135820.
Pełny tekst źródłaLe but de ce travail de thèse a été de rechercher les modèles de réseaux cohérents avec les observations locales (distributions de longueurs et d'ouvertures) et globales (à l'échelle du réseau). Ce travail s'inscrit dans le cadre d'une approche pluridisciplinaire destinée à utiliser des données obtenues à des échelles différentes (par exemple essais de puits et données de carottage). Des modèles de réseaux bidimensionnels prenant en compte les larges distributions de longueurs et d'ouvertures ont été étudiés numériquement et théoriquement. Les résultats montrent une grande diversité de structures d'écoulement allant de la fracture unique concentrant l'intégralité du flux au modèle homogène. Le type de structure d'écoulement dépend non seulement de la densité et des distributions de longueurs et de perméabilité de fractures mais aussi de l'échelle d'observation. Dans la plupart des modèles, une échelle de transition marque le passage de structures complexes extrêmement chenalisées à des milieux dans lesquels le flux se répartit dans différentes structures indépendantes. L'évolution des structures d'écoulement s'accompagne d'une dépendance d'échelle des propriétés hydrauliques telles que la perméabilité. La perméabilité croît jusqu'à la longueur de transition avant de se stabiliser aux échelles supérieures. Cette démarche de modélisation, fondée sur des observations effectuées à des échelles locales (caractéristique de la fracturation) et validée à des échelles globales (échelles du réservoir), fournit une large gamme de modèles d'écoulement admissibles et théoriquement spécifiables à partir de données de terrain. La modélisation a été étendue à la détermination de la connectivité de réseaux d'ellipses tridimensionnels.
Les modèles d'écoulement les plus pertinents mis au point en régime permanent ont été étudiés en régime transitoire. Les évolutions spatiales et temporelles du rabattement dépendent des propriétés topologiques et métriques du réseau de fractures. Une analyse en fonction de la distance des essais de puits effectués sur le site de Ploemeur (Morbihan) a permis d'obtenir des résultats similaires sur un site naturel. Cependant aucune correspondance totale n'a pu être dégagée, peut être à cause de la nature éventuellement tridimensionnelle du réseau naturel. Au-delà de la prédiction des tendances moyennes, les modèles étudiés sont destinés à fournir une évaluation de la précision de la prédiction en fonction de la quantité de données disponibles. Du point de vue décisionnel, il s'agit de pouvoir estimer le risque associé à la nature incomplète des données de terrain.
Dreuzy, Jean-Raynald de. "Analyse des propriétés hydrauliques des réseaux de fractures : discussion des modèles d'écoulement compatibles avec les principales propriétés géométriques". Rennes 1, 1999. http://www.theses.fr/1999REN10196.
Pełny tekst źródłaDecain, Maxime. "Contribution à l'étude des relations microstructures : propriétés thermiques et d'écoulement pour les matériaux fibreux cellulosiques". Grenoble INPG, 2009. http://www.theses.fr/2009INPG0101.
Pełny tekst źródłaThis thesis deals with the characterization of the relationship between microstructural properties and physical properties of fibrous cellulosic media. The nicrostructural properties were estimated by analysis of 3D images obtained from synchrotron X-ray microtomographies of industrial and laboratory paper ;amples. The thermal conductivity tensor and the permeability tensor of the fibrous media are estimated by solving numerically the boundary problems, Irising from the periodic homogenization, on representative elementary volume (REV) extracts from the microtomographies. Particular attention was paid to he determination of REV associated with each property (structural and physlcal) using determinlstic and statistic approaches. Ln particular, these REV are !xpressed ln terms of number of heterogeneities of the microstructure, represented by the lengths of covariance, and depending on the desired precision. Ne estimated properties are compared with experimental measurements for validation. Finally, the influence on the physical properties of different nicrostructural parameters (porosity, volume fraction of fillers, microstructure gradient. . . ) resulting from the manufacturing process of these materials is lighlighted
Dion-Martin, Olivier. "Caractérisation de l'alliage AA5754 pour la détermination d'un critère d'écoulement". Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19297.
Pełny tekst źródłaAlgive, Lionnel. "Évolution des propriétés pétrophysiques d'écoulement pendant une injection de CO2 et impact induit au niveau de l'injectivité". Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL072N/document.
Pełny tekst źródłaThe geological storage of CO2 is considered as an attractive option to reduce the greenhouse gas emissions in the atmosphere. CO2 is not an inert gas, however. Its dissolution in brine forms a weak acid that has the potential to react with the host rock formation. The induced pores structure modification impacts the flow properties. Thus, to ensure the viability and sustainability of CO2 storage, operators need simulations that take into account the specificities of reactive transport. However, the macroscopic coefficients of the reactive transport equation are modified from the values of an inert tracer by surface reactions. These specificities due to mass transfer are currently not considered. Similarly, the permeability-porosity (K-F) relationship is only estimated semi-empirically. The aim of this thesis was to develop a method to obtain the macroscopic coefficients and the K-F laws, by solving the equations governing the pore-scale phenomena. To do this, we used the Pore Network Modelling approach (PNM). The advantage of the PNM is that it explicitly takes into account the pore structure, while conceptualizing the latter to a set of pores and throats whose morphology is simplified into spheres or cylinders for instance. The study is based into two successive upscalings: from local-scale to pore-scale, then from pore-scale to core-scale. The reactive transport problem is solved for basic elements, analytically or numerically. Then, using the solutions previously found at the pore scale, the reactive transport phenomena are treated throughout the network. Our model was validated by observations on micromodels and by a comparison with an acid-induced alteration experiment
Chatté, Guillaume. "Propriétés d'écoulement de suspensions concentrées de particules de PVC et leur lien avec la physico-chimie du système". Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET005.
Pełny tekst źródłaHighly concentrated and non-colloidal suspensions consisting of micrometric PVC particles dispersed in a liquid phase, were studied. These suspensions, called plastisol, are mostly used in vinyl flooring manufacture.A key feature of these suspensions is shear-thickening, since viscosity greatly increases as a function of the applied shear rate. This phenomenon is explained as being related to frictional forces between particles. Indeed, using an Atomic Force Microscope, we were able, for the first time, to link the macroscopic stress, at which shear-thickening appears, with the microscopic stress needed to enter a frictional regime.We then characterize the suspension viscosity up to 100 000 s-1. We observed that shear thickening is lowered with a more polydisperse powder. Large normal stress differences N1 and N2 were also measured, along with shear thickening. In addition, using both X-ray radiography and ultrasound, no particle migration in the sheared suspension could be detected.We also found that geometry plays a major role in the features of the flow of concentrated suspensions. For a smaller gap, the viscosity is lower and shear-thickening is pushed to higher shear rates. A non-local approach accounts for our experimental results.Replacing a number of PVC particles with CaCO3 particles changes both the viscosity and the maximum packing fraction quite dramatically. For both of these, we developed simple models that matched quite well with the experimental data. Moreover, we elucidate the rheological changes resulting from adding surfactant at the surface of each particle type.Finally, we investigated some instabilities observed while coating at high speed. At a moderate speed, a ribbing phenomenon appears. At a higher speed, a deposit is formed on the knife (downstream). The appearance of these instabilities correlates with normal stress differences
Chatté, Guillaume. "Propriétés d'écoulement de suspensions concentrées de particules de PVC et leur lien avec la physico-chimie du système". Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2017. https://pastel.hal.science/tel-03934778.
Pełny tekst źródłaHighly concentrated and non-colloidal suspensions consisting of micrometric PVC particles dispersed in a liquid phase, were studied. These suspensions, called plastisol, are mostly used in vinyl flooring manufacture.A key feature of these suspensions is shear-thickening, since viscosity greatly increases as a function of the applied shear rate. This phenomenon is explained as being related to frictional forces between particles. Indeed, using an Atomic Force Microscope, we were able, for the first time, to link the macroscopic stress, at which shear-thickening appears, with the microscopic stress needed to enter a frictional regime.We then characterize the suspension viscosity up to 100 000 s-1. We observed that shear thickening is lowered with a more polydisperse powder. Large normal stress differences N1 and N2 were also measured, along with shear thickening. In addition, using both X-ray radiography and ultrasound, no particle migration in the sheared suspension could be detected.We also found that geometry plays a major role in the features of the flow of concentrated suspensions. For a smaller gap, the viscosity is lower and shear-thickening is pushed to higher shear rates. A non-local approach accounts for our experimental results.Replacing a number of PVC particles with CaCO3 particles changes both the viscosity and the maximum packing fraction quite dramatically. For both of these, we developed simple models that matched quite well with the experimental data. Moreover, we elucidate the rheological changes resulting from adding surfactant at the surface of each particle type.Finally, we investigated some instabilities observed while coating at high speed. At a moderate speed, a ribbing phenomenon appears. At a higher speed, a deposit is formed on the knife (downstream). The appearance of these instabilities correlates with normal stress differences
Roche, Jean-Michel. "Simulation numérique de l'absorption acoustique de matériaux résonants en présence d'écoulement". Le Mans, 2011. http://www.theses.fr/2011LEMA1027.
Pełny tekst źródłaPerforated honeycomb panels are set in the aircraft inlet nacelles to reduce fan noise. The absorption of these resonant liners can be analytically predicted at low sound level, without a flow, but not when they are excited by high-level sound waves coupled with a grazing flow. Therefore, in order to improve their acoustic properties, a better understanding of their dissipation mechanisms and of the associated variations of their impedance is needed: this is the purpose of this PhD work. To achieve this aim, the behavior of a resonator impacted by different kinds of excitations is numerically computed, by three-dimensional direct numerical simulations (the compressible Navier-Stokes equations are solved) performed on the ONERA CFD CEDRE code. The effects of a rise of sound level over the acoustic properties of the resonator are first highlighted and evaluated, for a normal incidence and then for a grazing one, by "global" approaches (based only on the fluctuating fields in areas far from the resonator opening) and "local'' approaches (based on the fluctuating fields in the opening inlet). The relative efficiency of the dissipation mechanisms by wall friction and by vortex shedding is studied and the nature of the nonlinearity of absorption is clarified and discussed. The more complex configuration of an acoustic excitation coupled with a stationary 0. 1 Mach number flow is then studied. The additional nonlinearities generated by the presence of the flow are highlighted by numerical simulation and validated by comparison with Laser Doppler Velocimetry measurements carried out on the aerotherrno-acoustic bench of ONERA. Their impact on the impedance of the resonator is quantified, the results being ultimately compared to empiric models
Jory, Myriam. "Approche biophysique de la fonction muco-ciliaire de l'épithélium bronchique : propriétés d'écoulement du mucus et coordination du battement ciliaire". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS078.
Pełny tekst źródłaUnderstanding and treating chronic respiratory diseases are growing medical challenges due to changes in our lifestyles and environment. The epithelium of the respiratory tract is the first barrier against external aggression, in particular thanks to the mucociliary function. Functional elements are the mucus layer lining the tissue and the beating of cilia from the ciliated cells of the epithelium. Mucus is a complex and heterogeneous fluid that acts as a protective barrier by trapping particles and pathogens present in the inhaled air, while the coordination of the cilia beating allows the directed transport of the mucus layer and its evacuation from the bronchi. The mechanical properties of mucus coupled with the coordination mechanisms of beating cilia are still poorly understood. My thesis work focused on two biophysical aspects of these mechanisms: i) the study of mucus rheology at two scales, in macro-rheology and by active micro-rheology using optical tweezers directly on the tissue; ii) the understanding and quantification of the spatiotemporal coordination of ciliary activity and on the associated mucus transport, by developing a new tool for processing video-microscopy images and data analysis
Azzouzi, Houssain. "Propriétés rhéophysiques d'un système micellaire viscoélastique : rhéoépaississement apparent et oscillations des contraintes". Metz, 2005. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2005/Azzouzi.Houssain.SMZ0521.pdf.
Pełny tekst źródłaWe have studied rheological and optical properties of viscoelastic micellar solutions. We focus on a specific solution of CTAB/NaSal (50/100 mM), which shows, apparent shear-thickening in a narrow range of shear rates after a perfect plateau of shear stress characteristic of shear-banding. In this regime, in phase oscillations of the shear stress and of the first normal stress difference are recorded in a shearing device operating under controlled strain. The main goal of this work consists in finding correlations between rheological reponses, optical observations and ultrasonic velocimetry measurements in order to bring information on the mechanism which leads to the formation of these time periodic variations of shear stress. The direct observation of the annular gap of a Couette cell in a direction perpendicular to a plane containing the vorticity shows that the turbidity of the whole sample also undergoes time dependent variations with the same period as the shear stress; these variations are related to a periodic variations of the concentration of shear induced structures (SIS). However local velocity measurements reveal clearly the presence of slip at the walls of the Couette cell. In the shear-thickening regime, velocities present periodic fluctuations which probably induce shear stress oscillations
Chami, Nada. "Etude multi-échelles de la formation de coulis frigoporteurs diphasiques pour la réfrigération secondaire". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. https://theses.hal.science/tel-04329711.
Pełny tekst źródłaWith 20% of electricity consumption worldwidel, refrigeration and air conditioning (RAC) industry is one of the most energy-intensive sector. Among the solutions to reduce RAC carbon footprint, it is possible to implement environment-friendly fluids in indirect refrigeration systems which roled is to carry thermal energy from the cold production machine (containing primary refrigerant) to the places of use. indirect refrigeration systems using secondary refrigerants thus greatly reduces primary refrigerant amount (by about a factor of 10). Currently, the use of phase change materials (PCM) in indirect refrigeration systems (to form PCM slurry) is an innovative design in development. They improve the process by increasing the energy density of the fluid. Currently, the use of phase change materials (PCMs) in secondary refrigeration systems (to form a PCM slurry) is an innovative design in full development.This study focused on a secondary refrigeration process based on the use of gas hydrate slurry as MCP. Mixed gas hydrates, which are formed with water and CO2 and cyclopentane (CP) are studied in this work. The first experiments focused on the study of four-phase equilibria (CO2, liquid water, liquid cyclopentane and hydrate). The presence of cyclopentane as a promoter to the formation of mixed CP + CO2 hydrates allows the formation of hydrates at low pressure and moderate temperature. A second study of the flow conditions of the cyclopentane hydrate slurry and the CP + CO2 mixed hydrate slurry is performed in a dynamic circulation loop at different cyclopentane fractions ranging from 3 wt% to 15 wt%. The rheological parameters (viscosity, flow behavior...) related to these two types of slurries are compared. The rheological study allowed to highlight the shear-thinning behavior of the hydrate slurry for differents cyclopentane fractions. In addition, the rheological behavior of the mixed CP + CO2 hydrate slurry showed an evolution in time. The first results of the thermal characterization at a heating tube complete this work
Frąś, Teresa. "Modélisation de la surface d'écoulement des matériaux incluant l'anisotropie initiale et l'effet différentiel des contraintes : approche expérimentale et numérique". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0271/document.
Pełny tekst źródłaThis thesis proposes physically consistent description of the elastic limit of the material on the basis of the results associated with FEM simulations experiments. The theoretical approach is based on the assumption that the limit of elasticity of material Burzynski. The hypothesis effort material is derived from the definition of the end energy of variable stroke volume change or distortion. In special cases, the criteria include asymmetry elastic range and in an expanded form, it is applicable to initially anisotropic materials. The thesis has demonstrated the need to provide an integrated view on experiments and numerical simulations to obtain the description of the onset of plasticity. To achieve this goal, a specific methodology was developed - the procedure which combines experimental techniques with numerical simulations supported by a precise description of the behavior of materials. As part of the approach to numerical modeling, numerical analyzes were performed to correct the inaccuracies of the experimental results presented. In addition, Burzy?ski isotropically been implemented in the finite element method via UMAT (user subroutine for ABAQUS). The versatility of description performance is illustrated by the application of materials with amorphous structure and cubic crystals of different systems: structure FCC (face centered cubic) and BCC (body centered cubic). Examples : - type material FCC structure - OFHC Cu, Oxygen Free High Conductivity Copper material BCC structure type - E335 , not alloyed high strength and example of the amorphous steel materials - polycarbonate (PC) and biopolymers ( PLA / PBAT ) . Materials for specific analyzes were performed to obtain microstructural and mechanical properties via wide range of stress tests in various loading conditions. The number of copies of data found in the literature of the pressure sensitive and / or anisotropic materials was initially analyzed. It has been proven that the proposed criteria provide accurate approximation of the state of early plasticity in relation to other terms in common use. The resulting criteria appear to be universal and widely applicable method of obtaining a description of the appearance of the plasticity
Saad, Mazen. "Propriétés de quelques modèles d'écoulements en milieu poreux". Bordeaux 1, 1993. http://www.theses.fr/1993BOR10630.
Pełny tekst źródłaBayoda, Kossi Djidula. "Propriétés électriques, optiques et mécaniques d'une décharge de surface à barrière diélectrique nanoseconde pulsée. Application à la mesure de vitesse pariétale et au contrôle des écoulements aérodynamiques". Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2319/document.
Pełny tekst źródłaThis thesis aims to study new design of nanosecond pulsed dielectric barrier discharge in 3 electrodes configuration: the sliding discharge (SL-DBD), to compare it to the conventional nanosecond DBD in 2 electrodes geometry (NS-DBD) and to show also its capacity to be used as a friction velocity or wall shear stress sensor and to be used as electromechanical actuator for flow control.In its first part, the electrical properties of these two discharges are characterized and point out the key parameter governing the transition of one regime to another. The visualizations with an intensified camera confirm this transition when the mean electric field increases over 6.5 kV/cm. Therefore they extend further and cover the inter-electrode gap. Mechanical diagnostics (Schlieren and pressure measurements) characterize the pressure wave generated by these discharges. In the second part, the electrical characterization of the SL-DBD under flow conditions shows that the courant « collected » by the third electrode is almost proportional to the wall flow velocity. However, even if other studies needed to be performed, these encouraging results reveal the ability of the SL-DBD to be used as a friction velocity or a wall shear stress sensor. Finally, the third part is addressed to the effect of the SL-DBD on aerodynamics flows in order to manipulate them. Several configurations are studied (airfoil, backward facing step, flat plate) and the results have shown the complexity of the physicals phenomena governing the control authority, without being able to fully explain them
Loulergue, Patrick. "Caractérisation In-Situ de dépôts formés en filtration membranaire de suspensions particulaires et de biofluides : intéraction entre structure locale et performances du procédé". Thesis, Toulouse, INSA, 2012. http://www.theses.fr/2012ISAT0046/document.
Pełny tekst źródłaMembrane fouling is one of the major drawbacks of membrane bioreactors. This study is thus a contribution to the understanding of the dynamic structuring of complex deposits build-up during dead-end filtration of complex biofluids. Several tools were used to perform in-situ characterization of cake layer structural properties at local scale and to link them to global filtration performances. The electrokinetics properties of the deposit were also investigated. An optical and an acoustic method were used to measure local cake thickness and growth kinetics. The thicknesses given by the two methods were first compared. It was shown that for compact deposits the two different methods lead to the same thickness of the deposit. For more porous deposits, these two methods allow to obtain complementary data at two different depths of the deposits. The influence of operating conditions on cake layer structuring during filtration of modelled particles was evaluated. Using the optical method it was shown that, whatever the operating conditions, the cake structure is not constant in time. Furthermore, a spatial variability of the cake layer thickness might exist especially in the case of weak particle-particle repulsion. Finally, it has been investigated whether the different methods could be applied or not to the case of biofluid filtration. The structural properties of the complex deposits built up during diluted activated sludge filtration were investigated. Cake compressibility was observed at global scale by a monitoring of process performances and was also observed at local scale: cake thickness decreases as TMP increases. Furthermore, at local scale, a spatial variability of deposit structure was found. Particle addition into the biofluid was assessed in order to mitigate compressibility effects
Abdelmoula, Nouha. "Comportement élasto-plastique incrémental des poudres ductiles : simulation de l'écoulement plastique par la méthode des éléments finis multi-particules". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI036/document.
Pełny tekst źródłaThis thesis is concerned with the modelling of the mechanical behaviour of ductile powders during cold compaction process. A numerical method was implemented, in which a powder sample was assimilated to an assembly of 50 meshed particles in a cubic box which was submitted to compressive loadings simulated by means of the finite element method. Each particle was meshed and assigned an elastic-plastic constitutive behaviour. Particles interacted through mechanical, frictional contact and underwent large transformation during loading.The method developped in the thesis consisted in imposing boundary conditions as displacements or forces on the bounding walls of the numerical sample. The mechanical response of the sample was averaged to obtain the equivalent response of a continuum in terms of stress and strain. Various loading paths, including loading paths that are technically not attainable by experimental means, were applied up to different values of relative densities, from low (60%) to high values (98%). Much information on the phenomenological behaviour of the numerical sample could be obtained, in relation with the morphology of deformed particles and the evolution of contact surfaces.The results were interpreted based on the concepts of classical elasto-plasticity, i.e., yield surface and flow rule. The main focus of the study was the analysis of incremental plastic flow and the existence of a plastic potential. Results showed that the flow rule postulate, based in the plastic potential, could be considered as valid for stress states relatively far from the loading point. In the vicinity of the loading point, the direction of the plastic strain increment vector ceases to be unique. This behaviour, which is an original feature of ductile powders mechanical behaviour, was attributed to the anisotropic strain-hardening processes at stake, related to the anisotropic formation of contact surfaces between particles. The drop in mechanical properties related to dilatancy was also studied
Benabderrahmane, Yacine. "Modélisation dynamique et thermique d'écoulements diphasiques solide-liquide en présence d'effets non locaux et application au chauffage ohmique de mélanges agro-alimentaires". Compiègne, 2001. http://www.theses.fr/2001COMP1351.
Pełny tekst źródłaStauffert, Maxime. "Simulation numérique d'écoulements compressibles complexes par des méthodes de type Lagrange-projection : applications aux équations de Saint-Venant". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLV045/document.
Pełny tekst źródłaIn this thesis we study a family of numerical schemes solving the shallow water equations system. These schemes use a Lagrange-projection like splitting operator technique in order to separate the gravity waves and the transport waves. An implicit-explicit treatment of the acoustic system (linked to the gravity waves) allows the schemes to stay stable with large time step. The correction of the pressure fluxes enables the obtain of a precise approximation solution whatever the regime flow is with respect to the Froude number. A particular attention has been paid over the source term treatment which permits to take the topography into account. We especially obtain the so-called well-balanced property giving the exact conservation of some steady states, namely the "lake at rest" state. 1D and 2D versions of this methods have been studied and implemented in the finite volumes framework. Finally, a high order discontinuous Galerkin extension has been proposed in 1D with classical limiters along with a combined MOOD loop a posteriori limiting strategy