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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Defects exist in geo-membranes and leachates, provided by water percolation through the waste, then flow in the interface between the two components of the lining system. Ce probleme est particulierement critique pour les reactions rapides et tres exothermiques.

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Flaubert invents a new form of grotesque diphasiwues the grotesque of ideas — and, in a mise-en-abyme from the first Tentation to the version, he questions these fields of knowledge.

Parallel direct numerical simulation of turbulent flows evoulements rotor-stator cavities. This work investigates the properties of this model in order to simulate the phase transition flows occurring in nuclear engineering. Increasing of exchanged power was measured: On a complete et precise certains points de la premiere partie de ce rapport concernant les equations generales de conservation des ecoulements diphasiques.

Renforcer les partenariats entre les conseils subventionnaires de la Previous article Next article. With this principle accepted, we still have to validate the products themselves, i.

The value of J, obtained from the oil production curve leads to the description of the bubble population, in terms of their number and size. Centre d’ Etudes Nucleaires, Direction des piles atomiques. Macroscopic models for single-phase flows in fractured porous medium: The study of these natural fracture surfaces at micro and macroscopic scale is completed by a theoretical modelization of their hydro-mechanical behaviour.


In the framework of the diminution of heat transfer fluid consumption, the concept of indirect refrigerating circuits, using cooling intermediate fluids, is reviewed and the fluids that are currently used in these systems are described.

The problem considered is of importance both from a fundamental point of view and from that of its industrial applications.

Comportements Sexuels parmi les Adolescents et Jeunes. Les attaques des Termites Isoptera dans les parcelles de Une methode analytique a ete etablie et des experiences ont ete realisees au cours desquelles les deux parois de l. First, a theoretical thermodynamic framework is constructed to describe the liquid-vapor mixing.

A framework of analysis Ecoulemfnts main part of this study is devoted to the design of Robin interface conditions and to the formulation of the interface problem.

les ecoulements diphasiques: Topics by

Heat transfer in ecoylements tubes, between parallel plates, along a semi-infinite plate, in annular spaces and along tube bundles for exponential distribution of the heat flux in forced, laminar or turbulent flow; Transfert de chaleur dans des tubes lisses, entre des plaques planes paralleles, le long d’une plaque plane, dans des espaces annulaires et le long de faisceaux tubulaires pour une repartition exponentielle du flux de chaleur en ecoulement force, laminaire ou turbulent.

Both approaches provide encouraging results and allow unsteady simulations for a low computational cost. Using the volume wcoulements theory of Quintard and Whitaker, the local problem is replaced by a double-porosity large scale description.


This study allows to answer some fundamental questions about the physical meaning of the jump conditions, the values of the jump parameters and the location of the interface. First, we focus on the definition of its weak solutions. The description of such fields is based on a probabilistic approach leading to an estimate of the characteristics of the reservoir rock, i.

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. The behaviour of an adiabatic two-phase gas.

The heat transfer parameters were determined experimentally in electrically heated tube bundles for turbulent flow parallel to the axis.

Structure of two-phase air-water flows. The first one relies on diphasisues complete resolution of the Navier-Stokes equations on a refined grid close to the wall making eckulements possible to rebuild the temperature fluctuations near the wall.

Les procedes classiques de mesure de la vitesse d’ ecoulement dans les tubes d’ecrans necessitent des montages difficiles et risquent de perturber le phenomene a mesurer. At last, comparison between numerical and experimental results allows to validate the numerical code.