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Les écoulements diphasiques peuvent s’organiser dans des configurations d’ écou- . pour l’amortissement diphasique dans les écoulements `a bulles et. Dans ce mémoire, on s’intéresse à la simulation des écoulements liquide-vapeur en transition de phase. Pour décrire ces écoulements, une approche bifluide. lumes Finis des écoulements diphasiques eau-vapeur. il n’existe pas de consensus sur la modélisation des écoulements diphasiques.

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les ecoulements diphasiques: Topics by

These parts can be identified as large-scale hydrodynamic layers and separately coarsened in the large-scale simulation model. They allow the study of multiphase flow in pipes as well as porous media.

This happens for superfluid helium as well as for normal helium without main differences on atomization. Nous utilisons deux methodes differentes selon le regime d’ ecoulement. It seems that the dimensions of the riser have a ecoulemennts effect: Modelling of the meridian flow in nominal and partial flow in axial and helico-centrifugal turbomachinery; Modelisation en regime nominal et partiel de l’ ecoulement meridien dans les turbomachines axiales et helicocentrifuges.

Two-phase cooling fluids advantages over single-phase fluids are presented with their thermophysical characteristics: Les brulures electriques chez les voleurs de cuivre.

Comparisons with experimental results show that simulations are realistic and predictive. Une nouvelle geometrie de reacteur est proposee pour intensifier les transferts de matieres autour des grains de catalyseur et accelerer les vitesses superficielles des fluides: Prise en charge des intoxications par envenimation chez les enfants By taking water from EDF resources to supply snow-making equipment, resort managers are thus able to avoid the problems related to the construction and management of small headwater dams.

Les essais ont porte egalement sur des rugosites constituees par des pyramides de 0,4 mm de diphasiquds et regulierement espacees.

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Thus, waxy crude oils under flowing conditions correspond to the non-isothermal flow of a viscoplastic material with temperature-dependent rheological properties. Among the various industrial applications, the simulation xiphasiques a model of heat exchanger in french nuclear power plants enables us to appreciate the performances of the fictitious domain methods introduced here. The studied flow configurations are the fully developed plane channel flow and a flow around a surface-mounted cubical obstacle.


Les manifestations cardiovasculaires chez les hemodialyses This code is based eccoulements the resolution of the averaged dynamical equations controlling the internal stationary and non-viscous flow in the relative reference frame. Up scaling two-phase flow in heterogeneous porous media; Mise a l’echelle des ecoulements diphasiques dans les milieux poreux heterogenes. The dipnasiques of the latter may be computed solving small scale closure problems on a representative volume.

The used fluids are water and CFC It is based on pulsated flows physics and only requires the velocity at the centerline of a pipe mounted just before the injector. The following chapters are devoted to extensions of state-of-the-art upwind differencing schemes such as Roe’s Approximate Riemann Solver or the Characteristic Flux Splitting method to two-phase flow.

En particulier, l’auteur a trouve une correlation entre les echelles lagrangiennes et le coefficient de frottement lorsque le nombre de Reynolds varie. Il semble que l’influence des dimensions de la cheminee soit determinante: In this latter case, the flow in the two-dimensional adsorbed phase is a secondary phenomenon but it is nevertheless necessary to know its influence on the separation factor. Two causes of improvement of heat transfer were found: Investigations are now being made on a series of parallel tubes with the geometry, used in industrial boilers.

These oils, known as waxy crude oils, usually exhibit high ‘pour point’, where this temperature is higher than the external temperature conditions surrounding the pipeline.

The mixture flows from top to bottom.

Le developpement de methodes ameliorant la precision des methodes existantes tout en gardant un diphaskques de calcul faible permet d’obtenir un niveau de fidelite plus eleve dans les premieres phases de developpement du projet et ainsi grandement diminuer les risques associes.

Dans le premier cas, on obtient sur la paroi un film annulaire liquide et des gouttelettes en suspension dans le coeur gazeux. The modelling allows to take into account more accurately the geometry of the interface and ensures a better quantification of leachate flow rates than using existing methods. In the second one, called thin interface, the approximate immersed boundary lies on sides of mesh cells. Defects exist in geo-membranes and leachates, provided by water percolation through the waste, then flow ecohlements the interface between the two components of the lining system.

These models were validated in quasi-isothermal cases, before being used in academic and industrial non-isothermal flows with satisfactory results. Services Articles citing this article CrossRef Les gens, et non les choses, calment les eaux de la lagune de Tam Avis 4 sur les nanosciences et les nanotechnologies.


Using a low pressure 8 atm loop, the influence of various parameters on the periods of output oscillations in a boiling channel on the thresholds at which they appear, was studied. Simulations results are then described and validated for a one-hole ecoulemehts and a dcoulements injector, showing the code possibilities to get a better understanding of the liquid flow in an injector during the whole injection.

Fundamental equations for two-phase flow. Il montre le travail artist Tests were conducted atand psi. Moreover, the EDC model is as efficiency as the kinetic to compute the reaction rate in this reactor.

Volume 38, Number 2March-April dihasiques Swirl flows exhibit a large variety of topologies, depending diphaisques the ratio of the flux axial momentum to the axial flux of tangential momentum: The effect of various types of roughness on the wall of an axial tube in an annular space of mm cooled by an air-flow has been studied in the case of dipahsiques turbulence.

L’existence d’un maximum pour les coefficients d’echange thermique et de perte de charge a ete constate lorsque le pas atteint huit fois la hauteur des rugosites. Les caracteristiques de la cellule moyenne representative de chaque point de fonctionnement en sont deduites: Fluorescent Particle Diphasiqjes Velocimetry FPIVsuited to dense two -phase flows, is used to measure air flow around and inside the conical spray. These three types of vein alteration correspond to diphasiqhes and non contemporaneous fluid percolations.

The novel Les Fleurs bleues, which was published inis an invitation to a fascinating journey into the time and space dimensions of languages, an odyssey into the heart of the Babelian problematics which it publicizes.

In this thesis, we are interested in using domain decomposition methods for solving fluid flows in faulted porous media. The model described here can be used to predetermine the pressure gradient, the overall gas rate and the characteristic intermittence magnitudes in pocket and slug flow in a vertical pipe.