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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Ce travail porte sur le regime a poches ecoulenents sur la transition vers la configuration qui lui succede: Different numerical schemes have been tested to improve the computation accuracy. The tools we use are either experimental or numerical ones.

Il comporte certaines recommandations en vue de recherches futures indispensables et donne des conseils sur la facon de minimiser les effets de deversements de petrole dans le milieu marin canadien.

In the last part, ecoulemenhs the help of the new theory presented here, we are for the first time able to explain all the experimental data. Downcomer boiling phenomena is one of the key issues for a postulated large-break LOCA LBLOCA in a conventional pressurized water diphasiqkes, because it can degrade the hydraulic head of the coolant in the downcomer and consequently affect the reflood flow rate for a core cooling.

les ecoulements diphasiques: Topics by

The flux shows a maximum as a function of unsaturation. Such problems include the change in geometric scale, the estimating of ultimate recovery and how production will evolve in time. Equations are algebraic and differential. Test was performed in a one side heated rectangular test channel which was designed by adopting a full-pressure, full-height, and full-size downcomer-gap approach, but with the circumferential length was reduced Nous ne doutons pas de l’existence du temps, qui demeure pourtant un objet introuvable.


At this scale, the elements making up the medium are sufficiently small porous volumes compared to the dimensions of medium to be considered as points in the mathematical sense, but large enough to encompass pores with.

Ce maximum observe se place vers une temperature moyenne de la paroi de deg. We developed a stochastic model for the dynamics of the front, taking the viscous coupling into account.

These course notes, presented at the This thesis is devoted to the modelling and numerical simulation of liquid-vapor flows. Artaud et les Tarahumaras. Next, we studied the exchange coefficient parameter, by unifying the different definitions of the literature in a single framework using a Fourier analysis.

It has been shown that the extensive H. We describe Level Set method which has been used to track interface motion, and numerical methods for solving Navier-Stokes equations. Domain decomposition methods for flows in faulted porous media; Methodes de decomposition de domaine pour les ecoulements en milieux poreux failles.

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For this, a method of liquid film flow thickness measurement is developed in a quartz Hele-Shaw cell. A geometrical study of the fracture systems at micro or macroscopic scales, based on the spatial distribution of sealing minerals, is applied ecou,ements two different granites: ZUBER; a summary of this work presented. Such regimes for the two-phase flows are analogous to the torrential and fluvial regimes for the shallow-water equations.

Among the various industrial applications, the simulation on a model of heat exchanger in french nuclear power plants enables us to appreciate the performances of the fictitious domain methods introduced here. Les AOC dans la mondialisation.

The eccoulements were carried out with distilled water and with a mixture of 60 per cent ethylene glycol and 40 per cent water. Several numerical results attest the good convergence properties of the proposed transient algorithm.

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Then it is primordial to be able to reckon it in the case where it is the highest, that is to say exoulements the fluid is initially undersaturated. Measurements of oil production weight and residual saturations image analysis show clearly the influence of the initial stability of oil, coating water in the presence of gas, on the flow mechanisms.

This work deals with detonation and deflagration waves in magnetogasdynamics.

The properties of the fluids are first approached by state equations of ideal diphaxiques type and then extended to real fluids. The pressure and temperature range within which the oil and gas-condensate properties must be known coupled with the fact that the overall composition of.

But how to transfer knowledge in an area of some 14 million inhabitants with several linguistic and cultural regions in which thousands of projects are carried out each year, ecoulemenrs all kinds of players who work and life in completely different contexts are able to learn and benefit from one another?

Several flow regimes for the two-phase mixing derive from this analysis. The very complicated evolution of the radial structure is shown by the measurement of the mean bubble flux at several points in ecohlements tube. Toute schematisation peut etre prise en compte grace a un jeu d’indices. In order to correctly predict the domain of weak variation to saturation, D. The formulae ecoulemejts by WAPD and CISE do not give a satisfactory estimation of the critical heat flux, and the essential reasons for this inadequacy are explained.