Literatura académica sobre el tema "Milieux granulaires – Dynamique des fluides"
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Artículos de revistas sobre el tema "Milieux granulaires – Dynamique des fluides"
Youcef, Ahmed y Rachid Saim. "Simulation numérique du comportement dynamique et thermique de deux fluides en contre courant". Journal of Renewable Energies 20, n.º 1 (12 de octubre de 2023): 69–80. http://dx.doi.org/10.54966/jreen.v20i1.610.
Texto completoTesis sobre el tema "Milieux granulaires – Dynamique des fluides"
Abriak, Nor-Edine. "Ecoulement d'un matériau granulaire à travers un orifice effet de paroi". Lille 1, 1991. http://www.theses.fr/1991LIL10122.
Texto completoKhati, Salah. "Comportement des matériaux : étude micro-macro du frottement et de la dilatance". Lille 1, 1996. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1996/50376-1996-77.pdf.
Texto completoFélix, Gwenaëlle. "Écoulements de milieux granulaires en tambour tournant : étude de quelques transitions de régime : application à la ségrégation". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL080N.
Texto completoDjouwe, Meffeja Merline Flore. "Simulation et modélisation de milieux granulaire confinés". Rennes 1, 2012. http://www.theses.fr/2012REN1S005.
Texto completoBecause of their industrial and geophysical applications, granular flows have a prominent place in our environment. In this thesis, we study these flows by numerical simulation of type "discrete elements" (where the grains are treated explicitly) and of type "continuous medium" (where the granular material behaves as an effective medium obeying a given rheology). We first studied the granular flows by the "discrete elements" method in silo geometries. By changing the micro-mechanical properties of the grains (restitution and friction) we showed that they had a significant influence on the flow discharge. A detailed study of the behavior of grains has shown that this influence comes from a variation of the packing fraction at the outlet of the silo, the grains velocity experiencing very little change. Although models such as "discrete elements" provide access to all the individual properties of the grains, they have one major drawback : the computation time is very important that prohibits the modeling of geophysical and industrial situations. To overcome this problem, we used the "continuous medium" approach, which consider that the granular medium studied follows a rheology recently proposed in the literature. After discussing the numerical implementation, we have studied this rheology for steady and fully developed flows with a semi-analytical method in two configurations: a shear cell and a channel. This allowed us to highlight the differences between a granular medium and a Newtonian fluid
Chrząszcz, Kamil. "Ondes dans les milieux granulaires : de l’échelle microscopique à l’échelle macroscopique". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC064/document.
Texto completoThis thesis deals with the study of mechanical wave propagation in dry or wet granular media, with the aim of relating the phenomena at the microscopic scale (particles dynamics, interaction potentials between grains, rheology of the interstitial fluid) to the features at the macroscopic scale (dispersion relation, wave speed and attenuation in the long wavelength approximation). The systems under study are either large one-dimensional granular media, as the analogs of the paths of the most compressed grains (the force chains) in real granular packings, or the real granular media themselves. In a first place, we study experimentally the wave transmission through alignments of dry centimetric spheres, which we model via the Hertz potential. We show that the elasto-frictional coupling between the grains and a substrate (the spheres’ support) induces an on-site elastic potential, which in turn induces a band gap at zero frequency in the transfer function. In a second place, we show that the presence of an infinitesimal amount of viscous fluid at the contact between every particle induces an elasto-hydrodynamic (EHD) interaction. The later affects the attenuation of waves in addition to a significant increase of the wave speed, which in this case both non-trivially depend on the elasticity of the particles, on the viscosity of the fluid and on the frequency. In a third place, we check the reliability of our analysis to describe ultrasonic wave propagation in real granular materials such as dry or wet sand; our particles are here millimetric spheres. In the dry configuration, our results are consistent with an effective medium theory (EMT) which relies on the Hertz-Mindlin interaction in the long wavelength approximation. In the wet configuration, the EMT model combined with an EHD mechanism fairly reproduces our preliminary observations
Sierra, Christophe. "Instabilité en fluidisation gaz-solide : dynamique des lits denses et influence des conditions aux limites". Aix-Marseille 1, 2002. http://www.theses.fr/2002AIX11064.
Texto completoMutabaruka, Patrick. "Modélisation numérique des milieux granulaires immergés : initiation et propagation des avalanches dans un fluide". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00984870.
Texto completoJop, Pierre. "Ecoulements granulaires sur fond meuble". Phd thesis, Université de Provence - Aix-Marseille I, 2006. http://tel.archives-ouvertes.fr/tel-00106185.
Texto completoCe travail s'articule principalement en trois parties. Premièrement, dans le but de fournir une description détaillée des écoulements sur tas, une étude expérimentale systématique des écoulements stationnaires a été menée dans un canal. Nous avons ainsi pu mettre en évidence l'importance des parois latérales du système dans le cadre des écoulements à la surface d'un tas : les propriétés de l'écoulement sont complètement contrôlé par la largeur du canal. Ce constat nous a ensuite conduit à la proposition d'une modélisation fondée sur une rhéologie récemment développée.
Cette rhéologie a été ensuite étendue à trois dimensions et appliquée à notre configuration. Des simulations numériques permettent de reproduire correctement les propriétés des écoulements stationnaires. Nous avons enfin étudié un phénomène transitoire particulier afin de comprendre la manière dont l'épaisseur coulante évolue. Malgré la présence de certaines limitations, ce travail montre qu'une description locale des écoulements granulaire est appropriée et que la rhéologie proposée ouvre la voie à des modélisations plus complètes des écoulements granulaires denses.
Lecointre, Pierre. "A la recherche de la texture hydrophobe, et quelques effets collectifs dans les milieux granulaires et en économie". Thesis, Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAX009.
Texto completoFog or hot water can destroy the superhydrophobic properties of a textured surface owing to the condensation inside the texture. However, it was recently shown that such surfaces covered with cones at a scale of hundred nanometers could resist fog: condensed droplets can be ejected during their coalescence. We first experimentally show by electronic microscopy that a conical texture enables water drops to remain in a “fakir state”, even at a very small scale. We then studied different families of cone-textured surfaces by varying the spacing and the texture height. At the nanoscale, we showed that the texture size has a low influence on the antifogging efficiency whose limits rather lie in the water properties themselves, especially its viscosity. At the microscale, we described new situations where spontaneous ejection of condensed drops occurs despite a local trapping of water. We also studied the trajectory of expelled drops on such surfaces and confirmed that viscous effects play a major role in their ballistics. Finally, we focused on the ability of superhydropho- bic surfaces to repel hot water, a challenging situation for which we identified two independent recipes. In the second part of the thesis, we studied the ability of wetted fibers to capture dust. We showed that the quantities of captured particles is only influenced by the quantity of oil deposited on the fiber and not by its configuration (film or drop) on the fiber, unlike the growth kinetics of the aggregate where large differences are observed between the two configurations. The last part of the thesis focused on the Slutsky equation, a classical equation encountered in microeconomics. We described how the Slutsky matrix is modified when challenging classical economics hypotheses such as irrationality, interactions between goods or agents’ heterogeneity, and how it exhibits surprising features not predicted by consumer choice theory. The three parts can be addressed independently
Pascot, Arthur. "Rhéologie et propriétés de vidange de milieux granulaires modèles : application à l’écoulement en silo". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0156.
Texto completoThe discharge of grain in a silo is a common application in industry, but this typical granular flow is still not fully understood. Without a real fundamental understanding, the optimization of this application is done by empirical means, for example by applying vibrations to improve the discharge. Understanding the behaviour of this flow, and in particular the link between the apparent flow rate and the particle reorganization dynamics, would therefore allow a theoretical breakthrough and would open up practical ways of optimizing these flows in an industrial configuration. In this thesis, we study the discharge of model granular matter (monodisperse spherical beads) in a quasi-2D silo under the influence of mechanical vibrations. Experimental measurements and discrete element simulations (DEM) are performed to determine the effect of the geometry, particle properties and vibration characteristics. We evidence that vibrations make appear two distinct regimes, governed by the Froude number Fr and the relative frequency Ω of the vibrations. In the first regime, a decreased flow rate is observed when increasing the vibration intensity. This behavior is explained by the setting in motion, due to the vibration, of areas previously at rest and a higher energy dissipation. In the second regime, an increased flow rate is observed when increasing the vibration intensity. We find this behavior comes from the intermittent nature of the flow, with bursts of flow rate created by the propagation of shock waves all along the silo. As a first step, we propose for each regime an empirical law for the flow rate depending on the different parameters. Then, we studied the flow at the local scale in order to relate the apparent flow rate to local particle dynamics through flow rheology
Libros sobre el tema "Milieux granulaires – Dynamique des fluides"
1945-, Drew Donald A., Joseph Daniel D y Passman Stephen L, eds. Particulate flows: Processing and rheology. New York: Springer, 1998.
Buscar texto completoPal, Rajinder. Rheology of Particulate Dispersions and Composites. Taylor & Francis Group, 2006.
Buscar texto completoPal, Rajinder. Rheology of Particulate Dispersions and Composites. Taylor & Francis Group, 2006.
Buscar texto completoPal, Rajinder. Rheology of Particulate Dispersions and Composites. Taylor & Francis Group, 2006.
Buscar texto completoAn Introduction to Modeling and Simulation of Particulate Flows (Computational Science and Engineering). SIAM, Society for Industrial and Applied Mathematics, 2007.
Buscar texto completoVekstein, G. E. Physics of Continuous Media: A Collection of Problems with Solutions for Physics Students. Taylor & Francis Group, 2020.
Buscar texto completoDrew, Donald A., Daniel D. Joseph y Stephen L. Passman. Particulate Flows: Processing and Rheology. Springer, 2012.
Buscar texto completoDrew, Donald A., Daniel D. Joseph y Stephen L. Passman. Particulate Flows: Processing and Rheology. Springer, 2012.
Buscar texto completo(Editor), Donald A. Drew, Daniel D. Joseph (Editor) y Stephen L. Passman (Editor), eds. Particulate Flows: Processing and Rheology (The IMA Volumes in Mathematics and its Applications). Springer, 1997.
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