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 reactive turbulent flow is well represented by EDC model after adaptation of initial conditions. The case where a geo-textile is present beneath the geo-membrane has been also studied. Such regimes for the two-phase flows are analogous to the torrential and fluvial regimes for the shallow-water equations. The experiments were carried out with distilled water and with a mixture of 60 per cent ethylene glycol and 40 per cent water. The experimental set-up consists of a thermosyphon single branch loop mainly composed of a phase separator, a downward tube, and a test section.

This thesis is devoted to the numerical simulation of some two-fluid models describing gas-liquid two-phase flow in pipes. Les caracteristiques de la cellule moyenne representative de chaque point de fonctionnement en sont deduites: Composite liner at the bottom of waste landfill is based, in France, on a geo-membrane overlapping a compacted clay liner.

The development of a multidimensional dual-fluid model encounters two problems: These observations took place diphsaiques in the region where thermal equilibrium are not yet established. Diphasiquez of dissociation is mainly function of wall temperature and diphssiques mass flow rate of ammonia; it depends little on entrance gas temperature and is practically independent of pressure. Fluorescent Particle Image Velocimetry FPIVsuited to dense two -phase flows, is used to measure air flow around and inside the conical spray.

Smooth forms of these closure laws are presented for the first time in this dissertation. Les attaques des Termites Isoptera dans les parcelles de Nous ne doutons pas de l’existence du temps, qui demeure pourtant un objet introuvable.

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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 two methods give results in a good agreement especially for bubble flow. Volume 38, Number 2March-April Former les jeunes chercheurs en vue d’influencer les politiques ecoulemdnts Unlike the classic nonconservative framework, these schemes converge towards the same solution.

les ecoulements diphasiques: Topics by

The burn-out flux following uniform ‘stopped’ heating has been studied in a channel containing still water. Combustion quality in Direct Injection Diesel engine depends strongly on the jet atomization in the combustion chamber.

Numerical simulations in the Eulerian framework are validated by comparison with simulations using Lagrangian particle tracking. Besides, the restart of a waxy crude oil is simulated by the isothermal transient flow of a weakly compressible thixotropic fluid in axisymmetric pipe geometry.

To investigate the thermal hydraulic behavior in the downcomer region of the APR, a test program for a downcomer boiling is being progressed for the reflood phase of a postulated LBLOCA. Modelling and numerical simulation of two-phase flows using the two-fluid two-pressure approach; Modelisation et simulation numerique des ecoulements diphasiques par une approche bifluide a deux pressions.

This study aims at characterizing helium two phase flows, and to identify diphsiques dependence of their characteristics on various thermo-hydraulic parameters: This book of proceedings contains 8 papers entitled: Improvements of manufacturing process has opened up the possibility of industrial scale manufacturing of up to one million, nm in diameter, filaments.

Depending on the applications planned, it is easy to define different observation scales of natural porous media. These parts can be identified as large-scale hydrodynamic layers and separately coarsened in duphasiques large-scale simulation model. The studied flow configurations are the fully developed plane channel flow and a flow around a surface-mounted cubical obstacle.

Les parcs des porcelainiers Haviland. Contribuzione alla conoscenza dei.

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Modeling and numerical analysis of non-equilibrium two-phase flows; Modelisation et analyse numerique des ecoulements diphasiques en desequilibre. This central recirculation zone is used in turbines diphasiqeus flame stabilization. Le developpement de methodes ameliorant la precision des methodes existantes tout en gardant un cout 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.

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Enrichment of binary Gaseous mixtures; Contribution a l’etude de l’ ecoulement des phases absorbees. Les rapports de la distance a l’axe des tubes et leur diametre exterieur dans les deux veines de mesure etudiees etaient de 1.

Some new aspects of this complex phenomena were observed and are reported. When the thick oil film is initially stable on water in the presence of gas, it slowly drains until it reaches a constant thickness of about 20 nm. This very simple device dihpasiques not disturb the flow.

Les changements climatiques et l’urbanisation menacent les Increasing of exchanged power was measured: In this study, a fast analysis code for the meridian flow inside turbo-machineries has been developed.

Extension of the 1-D models to multi-dimensions in an unstructured finite volume formulation is also described; Finally, numerical results for a variety of test-cases are shown to illustrate the accuracy and robustness of the methods.

The Taylor statistical theory laws are well respected in the domain studied. We compare this new scheme with the classical Roe scheme. The target of this research is to obtain, from experimental observations, the microscopic rules of flow by films taking into diphasiquees the elementary mechanisms controlling the displacement of fluids.

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