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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Tests were also carried out using the roughness provided evoulements regularly spaced pyramids 0. These models were validated in quasi-isothermal cases, before being used in academic and industrial non-isothermal flows with satisfactory results.

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First, we focus on the definition of its weak solutions. In this review, we report the di;hasiques experimental studies performed on suspensions of solid particules in liquids, and concerning the rheological behaviour of such systems and the ordering of particules under the applied velocity fields. Sincewhen the very first AC wire became available, the comprehension of electromagnetic phenomenas ruling over stability and losses of multifilamentary superconductors in AC use, has much improved.

Diphasiquew estimations predict that over half the remaining offshore oil and gas reserves are located in deep water and marginal fields. Metrics Show article metrics.

The Lagrangian functional technique usually used for incompressible viscoplastic flows, is adapted to compressible situations. The results obtained are in ecoulemehts agreement with those obtained both from the graphical method using the dphasiques and from experimental recorded data.

Ecoulemenrs determining the void-fraction profile along a diameter of a vertical pipe 40 mm I. Les non-usages des TIC. Two-phase flows during draining of liquefied gases initially undersaturated. Rate of dissociation is mainly function of wall temperature and total mass flow rate of ammonia; it depends little on entrance gas temperature and is practically independent of pressure. The choice of a proper convection scheme for the transport of passive scalars led to the adoption of a high order upwind scheme with slope limiter.

Le taux de vide moyenne dans la section, calcule a partir des differents profils, a egalement ete compare avec succes aux resultats experimentaux de R.


In this paper, a turbulent combustion model is proposed, in which the combustion chemistry is reduced to a single reaction. 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.

Chapter 3 deals with the voluminal interface area used in the interface mass, momentum diphasjques energy transfers, and chapters 4 and 5 concern the ecouements of the developed models to concrete situations. Non-trivial steps in the construction of such solvers include the linearization, the treatment ecoulementd non-conservative terms and the construction of a Roe-type matrix on which the numerical dissipation of the schemes is based. Modeling of turbulent flows in porous diphaiques and at the interface with a free fluid medium; Modelisation des ecoulements turbulents dans les milieux poreux et a l’interface avec un milieu libre.

They allow the study of multiphase flow in pipes as well as porous media. The pressure gradient, average content and local phase distribution were measured. Simulations are validated by both ‘rebuilding’ method results and common rail pressure measurements.

ELM instabilities trigger violent quasi-periodical ejections of matter and heat that induce quasi-periodical relaxations of the transport barrier called relaxation oscillations. I for the global two-phase flow parameters and II for the local two-phase flow parameters. In order diphawiques describe these phase transition flows, a two-fluid two-pressure approach is considered.

Friday, April 9, – 1: A new one-velocity one-pressure dissipative model is then proposed, where the arising of second-order diphasiiques enables us to take into account unbalances between the phase velocities.

Les AOC dans la mondialisation. Une nouvelle geometrie de reacteur est proposee pour intensifier les transferts de matieres autour des grains de catalyseur et accelerer les vitesses superficielles des fluides: This internal structure is investigated for the eight types of process under the influence of the combustion mechanism and the dissipative coefficients viscosities, electrical and thermal conductivity.

Modelling of the flow in the interface of a composite liner at the bottom of a municipal waste landfill; Modelisation des ecoulements dans les interfaces des barrieres d’etancheite composites des installations de stockage de dechets.

Les rapports de la distance a l’axe des tubes et leur diametre exterieur dans les deux veines de mesure etudiees etaient de 1. En regime turbulent etabli, on observe dans un tube deux modes d’ ecoulements selon que le liquide mouille ou ne mouille pas la paroi. The numerical models developed here can be more generally used in the modelling of a wide class of physical models which can be put under an hyperbolic form.


The relation between the mean heat transfer coefficients and the friction factor in the tube bundles was found from the experiments as: We develop a numerical method based on a fractional step approach for this model. The authors have therefore developed a method consisting of the introduction of a calculated amount of sodium into the boiler water. We are interested in the numerical approximation of two-fluid models of nonequilibrium two-phase flows described by six balance equations.

les ecoulements diphasiques: Topics by

First, various nonconservative adaptations of standard Riemann solvers are developed to approach the convective part. Mountain reservoirs were initially built in the Alps to meet energy needs in the winter. The main advantages are the possibilities of studying non transparent media at small length scales. In both cases, there is some uncertainty as to the identity of their designers.

These closure laws comply with an entropy inequality. Renforcer les partenariats entre les conseils subventionnaires de la Knowing the thermodynamic properties of petroleum fluids, and in particular the density and liquid-vapor equilibrium coefficients, is important at different stages of production, i.

The two used permeability models geometrical or statistical remain very dependent on the definition of the characteristic opening of fracture or fissure. Un projet ecuolements sur tous les tableaux: Dans le deuxieme cas, il se forme un veritable brouillard sans film liquide sur la paroi.

A second experimental set-up simulating a compact heat exchanger has been designed to identify the functional and geometrical parameters creating the best distribution of the two phases in the different channels.