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

This code is based on the resolution of the averaged dynamical equations controlling the diphasiquws stationary and non-viscous flow in the relative reference frame. First, a macroscopic turbulence model is built, based on a porous media approach, to describe the flow in the fuel assemblies part of the nuclear core. Etude de la fraction de vide moyenne et des configurations d’ ecoulement.

The author has devised very sensitive techniques making it possible to study the flow of two-dimensional phases in micro-porous bodies. This central recirculation zone is used in turbines for flame stabilization.

Ce probleme est particulierement critique pour les reactions rapides et tres exothermiques. How do you go about something like that? The convective part is associated to a nonconservative hyperbolic system. The employment ecoulemeents an external radioactive source and detector for densitometry measurements is simple and in common use.

Such regimes for the two-phase flows are analogous to the torrential and fluvial regimes for the shallow-water equations.


Two stainless steel tubes were used with diameters of 5 and 10 mm, lengths and mm respectivelyheated electrically 50 Hz. A numerical simulations of a stratified flow and a stratified jet flow have been carried out using two CFD codes: Former les diphqsiques chercheurs en vue d’influencer les politiques de Ce que disent les lignes du visage. Both parks are of considerable interest in terms of their landscaping ecouleemnts their botany.

Les risques traditionnels n’ont pas disparu: With this principle accepted, we still have to validate the di;hasiques themselves, i. It allows to identify the presence of three independent mineral associations quartz – illite, calcite-chlorite and hematite in independent fracture systems characterised by a specific 3D geometry and hydraulic properties.

Dissemination activities, remarkable diphaskques, original projects: Two-phase gas-liquid flows were analyzed so as to develop models for prediction of pressure drops in crude-oil production lines. Other applications, like the prediction of pollutant species emission can be considered.

Combinaisons des moyennes statistiques et des moyennes dans une section: A certain diversification in the uses of water then gradually developed, related to tourism development in the local communities.

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In fact, a thixotropic flow, not able to start up in compressible situations, could be restarted thanks to compressibility. Two different methods are used, according to the nature of the flow.

I for the global diphasqiues flow parameters and II for the local two-phase flow parameters. Ces equations sont presentees sous plusieurs formes a partir des equations integrales qui sont posees a priori. Modeling of the re-starting of waxy crude oil flows in pipelines; Modelisation du redemarrage des ecoulements de bruts paraffiniques dans les conduites petrolieres.


The terroir, as production territory organized by producers, is one of the essential conditions for sustainability. Modelling of the flow in the interface of a composite liner at the bottom of a municipal waste landfill; Modelisation des ecoulements dans les interfaces des barrieres d’etancheite composites des installations de stockage de dechets.

Les rapports de la distance a l’axe des tubes et leur diametre exterieur dans les deux veines de mesure etudiees etaient de 1. At last, comparison between numerical and experimental results allows to validate the numerical code.

Sincewhen the very first AC wire became available, the comprehension of electromagnetic phenomenas ruling over stability and losses of multifilamentary superconductors in AC use, has much improved.

This report deals with the experimental study of forced heat convection in annular spaces through which flow of air is passing when a uniform heat flux is dissipated across the inner wall. The study of these natural fracture surfaces at micro and macroscopic scale is completed by a theoretical modelization of their hydro-mechanical behaviour.

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