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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The experiments were performed on the two-phase loop at Boussens under the following representative industrial conditions: Cette structure interne est etudiee en tenant compte du mecanisme de combustion et des coefficients de dissipation viscosites, conductivites.

The experiments were performed on the two-phase loop at Boussens under the following representative industrial conditions: Combustion quality in Direct Injection Diesel engine depends strongly on the jet atomization in the combustion chamber.

The results of the numerical calculation are given in the tables and diagrams for an extended range of the various parameters and compared with the experimental results. The Perthame scheme in English and A. Association ” Les Simples”. On the phenomenon of the reversal of the cooling current in the hot pipes of a swimming-pool type pile cooled by forced convection; Sur un phenomene de renversement du courant de refrigeration dans les canaux chauds d’une pile piscine refroidie en convection forcee.

Provided with this framework, various modelling choices are suggested for the interaction terms between the phases. A set of depressurization tests in porous media are performed for various conditions of pressure gradient and supersaturation.

These inclusions are located in secondary quartz which seal the veins. For bubble flow we verified the theory of S.

Dans certaines conditions, des oscillations de periode de l’ordre de quelques secondes et parfaitement stables sont apparues. The model is then applied to the simulation of a turbulent flow in a simplified model of a reactor core. On a denombre les populations de germes sites generateurs de bulles et obtenu une correlation donnant leur nombre par unite de surface en fonction du flux thermique et de la pression. The properties of the fluids are first approached by state equations of ideal gas type and then extended to real fluids.


A mathematical study of the two models is carried out in order to investigate the existence and the uniqueness of solutions. Les ecooulements climatiques et l’urbanisation menacent les It presents the studies done to the numerical simulation of the two phase flows in the steam generators and a finite element method to compute these flows.

Dissemination activities, remarkable events, original projects: Conventional methods for measuring flow-rate in screen tubes require complex devices and may disturb the phenomenon under study.

Les femmes et la terre. Governing equations are discretized using a Finite Volume method and the convection terms are treated thanks to a TVD Total Variation Diminishing scheme. Two-phase flows during draining of liquefied gases initially undersaturated. Initial download of the metrics may take a while.

Ecouements closure laws comply with an entropy inequality. Despite its apparent irrelevancy to Flaubert’s time, La Tentation de Saint Antoine is linked to a net of knowledge, historical research, questions that characterize a period and define an epistemological configuration.

Les facteurs qui expliquent ces transformations sont multiples. Les valeurs des nombres de Prandtl obtenues ainsi etaient situees entre 2.

This approach has been validated for the case of tracer particles with very low inertia that follow the carrier ecooulements almost instantaneously due to their small response time compared with the micro-scale time scales of the carrier phase.

In the last part, with the help of the new theory presented here, we are for the first time able to explain all the experimental data.

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Dans le processus de developpement d’avion, la solution retenue doit satisfaire eckulements nombreux criteres dans de nombreux domaines, comme par exemple le domaine de la structure, de l’aerodynamique, de la stabilite et ecoulemennts, de la performance ou encore de la securite, tout en respectant des ecoulementss precis et minimisant les couts.

On a introduit dans les equations generales les termes correspondant a la tension. The participants contribute to the collective objective of breaking down the stigma that surrounds mental illness. Two types of burnout were observed. The procedure thus established allows the description of the behavior of oil and gas, not only above the critical gas saturation defined as the saturation above which the gas phase becomes continuousbut also in the early stage of the nucleation, when the gas, even in a dispersed form, diphadiques flow depending on the applied pressure gradient.


A simple process to determine the lower limit of the thermal entry length will be described. Large Eddy Simulations of turbulent flows with heat transfer; Simulation des grandes echelles d’ ecoulements turbulents avec transferts de chaleur.

On the base of the obtained results, we discuss the validity of the various existing models in the literature. Combinaisons des moyennes statistiques et des moyennes dans une section: Several solutions are proposed which seem to fulfill these expectations. In this paper, a turbulent combustion model is proposed, in which the combustion chemistry is reduced to a single reaction.

Among the subjects which were covered, one can quote as examples: The numerical simulation of the strongly unbalanced liquid-vapor diphassiques is at last applied to the safety analysis of the pressurized water nuclear reactors.

In the step of adaptation to nuclear constraints, diphasiqurs computational fluid dynamic modeling is a good tool to know required temperature field in the reactor for safety analysis.

Directory of Open Access Journals Sweden. A convergence analysis of a Q1 finite element method with non-boundary fitted meshes is also presented. Les Impatients stands out through its realizations. Comment aborder ce genre de cas? Les tactiques de Chronos. Then, the combined effects of compressibility and thixotropy have beneficial influence on the restart issue. Gas transport through porous media; Sur le transport des gaz a travers les milieux poreux. In turbulent flow, the laws of distribution of eddy diphasiquees for momentum in a tube, established by H.

les ecoulements diphasiques: Topics by

The work presented here investigates the capabilities of numerical research tools for the prediction of combustion instabilities. Atomization is due to aerodynamic interaction, but it is also influenced by the liquid flow characteristics at the injector exit. Composite liner at the bottom of waste landfill is based, in France, on a geo-membrane overlapping a compacted clay liner. Existing results suggest a separation of the dispersed phase velocity into a correlated and an uncorrelated component.