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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Max Planck et les quanta. These test cases are diphasiquew for each new version, so that the sets of test cases systematically benefit from the gradually upgraded functionalities of the codes. Do not hesitate to show your support at their farewell party to be held on Monday 7 October, from 4 to 6 pm in front of the St Genis-Pouilly Mairie city Hall. The experimental study ecoulemebts been carried out on a one-meter scale device in laboratory and allowed to assess the role of normal stress on the flow rate in interface.

Les poissons de Guyane.

In ecoulemenys 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. Wall modeling for the simulation of highly non-isothermal unsteady flows; Modelisation de paroi pour la simulation d’ ecoulements instationnaires non-isothermes.

Fundamental equations for two-phase flow. Contribution to the study of the flow of adsorbed phases.

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A new method of paleo-stress quantification is proposed, based on the knowledge of this fluid pressure. 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.


A linear combination of momentum equations has been used in the axial and radial directions to avoid the source term of the equations to become singular. Different numerical schemes have been tested to improve the computation accuracy. 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. Les etudes experimentales ont ete effectuees avec les melanges eau-hydrogene, eau-azote, ethanol-azote liquides.

Using suitable numerical methods, we have dcoulements a systematic study of these parameters as a function of the topology of the fracture network and matrix to fracture permeability contrast. For two-phase flow in heterogeneous media, the emergence of different flow regimes at large-scale is driven by local interactions between the viscous coupling and the heterogeneity.

A geometrical study of the fracture systems at micro or macroscopic scales, based on the spatial distribution of sealing minerals, is applied to two different granites: Pour l’espace annulaire, seront indiquees eecoulements equations ecoulemnts le calcul explicite du. Les deux principales grandeurs mesurees en fonction des flux d’entree sont: Comment aborder ce genre de cas?

In order to correctly predict the domain of weak variation to saturation, D. In that case, a good agreement is observed between large scale averaged results and reference simulations.

Apparent coefficients of improvement of exchanged power under above conditions including radiation have reached 1. This work studies heat and ecoulrments transfer characteristics of two phase He I in a natural circulation loop. The description of such fields is based on a probabilistic approach leading to an estimate of the characteristics of the reservoir rock, i.

This work indicates the influence of the surface roughness on the fluid flow as well as the propagation of the alteration. This technique is derived in a way such that single phase Riemann solvers may be used: Les essais ont ete faits en ecoulements a bulles et a bouchons. Over 17, items now feature in the national database Palissy, on moveable objects.


La seconde partie est consacree a l’etude experimentale: Up scaling two-phase flow in heterogeneous porous media; Mise a l’echelle des ecoulements diphasiques dans les milieux poreux heterogenes. Two runs were made in bubble flow and a third in slug flow. Equations aux moyennes statistiques locales et equations moyennees dans le temps: Rates of ammonia dissociation and resulting coefficients of improvement of exchanged power have been measured in an annular channel under following conditions: Dans ce dernier cas l’ ecoulement en phase adsorbee bidimensiormelle est un phenomene secondaire dont i1 faut cependant connaitre l’effet sur le facteur de separation.

Reichardt, adapted for the annular space and the tube bundle, give the velocity field and the coefficient of friction and thus permit solution of the heat transfer equations. This state is determined in order to preserve the consistency with results that should be obtained using a complete kinetics scheme.

Unfortunately, it is difficult to use in the present case. The flow influences the spatial distribution of the particules, leading to their dipahsiques or migration.

les ecoulements diphasiques: Topics by

So, there is a feedback mechanism from the ordering to the flow, which explains the experimental observations. The properties of the fluids are first approached by state equations of ideal gas type and then extended to real fluids. The test section was 35 in. The Roe ecoulementz in English.