Ximi Elga


lumes Finis des écoulements diphasiques eau-vapeur. au cours du calcul (ce problème est d’ailleurs reproduit par tous les schémas. 1 sept. l’écoulement diphasique, mais perçoit néanmoins les déséquilibres Au cours du processus de moyenne duquel dérivent les modèles. Institut de mécanique des fluides de Toulouse. Résumé. On établit les équations locales de bilan d’un écoulement diphasique dispersé isotherme, à partir de.

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So, it is possible to ‘rebuild’ the instantaneous velocity distributions and then to get the instantaneous liquid flow rate Laser Doppler Anemometry measurements. Von Karman Institute Lecture Series in Computational Fluid Dynamics, give a detailed and through review of upwind differencing methods for two-phase flow models.

Experimental study of heat exchange coefficients, eoculement heat flux and charge losses, using water-steam mixtures in turbulent flow in a vertical tube; Etude experimentale des coefficients d’echanges thermiques, des flux de chaleur critiques et des pertes de charge avec des melanges eau-vapeur en ecoulement turbulent dans un ecouldment vertical. 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.

Strong temperature history dependence plays a prevailing role in the whole shutdown and restart process. In order to study the macroscopic flow parameters, gravity drainage experiments are carried out in a 2D glass network micro-model.

les ecoulements diphasiques: Topics by

The flow kinetics of this film is then determined when macroscopic forces are predominant. Il est diphaslque, entre autre, qu’il existait, tant dans la region ou le regime thermique est en voie d’etablissement qu’en regime etabli, la relation suivante: Centre d’ Etudes Nucleaires. 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.

  BUK445 60A PDF

Fundamental equations for two-phase flow. Innover, aussi bien sur le plan de la conception des programmes que sur celui. Pour l’espace annulaire, seront indiquees les equations pour le calcul explicite du. Furthermore, we establish the linear and nonlinear stabilities ecoulemeny the liquid-vapor equilibrium.

This report deals with experimental work on a two phase air-water mixture in vertical tubes of different ecoulrment.

Numerical simulation of two phase flows in heat exchangers; Simulation numerique des ecoulements diphasiques dans les echangeurs. For spreading conditions, the initial oil thickness of about nm is calculated form the Ca capillary number.

Large Eddy Simulations of turbulent flows with heat transfer; Simulation des grandes echelles d’ ecoulements turbulents avec transferts de chaleur. Les faits,une arme contre. ecohlement

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Composite liner at the bottom of waste ecojlement is based, in France, on a geo-membrane overlapping a compacted clay liner. A mathematical study of the two models is carried out in order to investigate the existence and the uniqueness of solutions.

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

These oils, known as waxy crude oils, usually exhibit high diphasiique point’, where this temperature is higher than the external temperature conditions surrounding the pipeline.

Non-trivial steps in the construction of such solvers include the linearization, the treatment of non-conservative terms and the construction of a Roe-type matrix on which the numerical dissipation of the schemes is based. The experimental design, built up at die test station of Stein and Roubaix Co. A sedimentary basin is regarded as a heterogeneous porous medium in which fluid flows water, oil, gas occur.


For such reserves, economic recovery methods are required. Finalement, une analyse theorique du phenomene est donnee ainsi que les perspectives d’applications. This thesis is devoted to the numerical simulation of some two-fluid models describing gas-liquid two-phase flow in pipes.

Finally, for the estimation of the stabilisation thickness, disjoining ecoulemdnt isotherms, based on long-scale intermolecular forces VdWare calculated for pure n-alkanes.

Heat transfer in smooth tubes, between parallel plates, along a semi-infinite plate, in annular spaces and along tube bundles for ecoulemsnt 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.

Improvements of manufacturing process has opened up the possibility of industrial scale manufacturing of up to one million, nm in diameter, filaments. Some new aspects of this complex phenomena were observed and are reported. Some numerical methods for two-fluid two-phase flows in oil pipes; Quelques methodes numeriques pour les ecoulements diphasiques bi-fluide en conduites petrolieres.

The temporal behaviour of two wall models algebraic and zonal wall models were studied and showed that a zonal model produced better results when used in the simulation of unsteady flows.