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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Heat transfer in smooth 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.

Its collection includes more than 15, works of art from Les Impatients as well as pieces donated by collectors of unconventional art, commonly known as “art brut” or “outsider art”. We show that it is possible to obtain local information on the fluid flow, such as velocity profiles in two phase systems, or maps of distribution of displacement probabilities in heterogeneous porous media. C’est le plus grand centre mondial de recherche en physique des particules. A reformulation of the six-equation system adapted to low Mach two-phase flows has been also proposed.

Today, the use of facilities belonging to EDF French Electricity Authority to provide water for winter resorts to make artificial snow represents a new phase. Par l’analyse des lois de transfert de chaleur, on a precise les mecanismes d’echanges et l’on a d’autre part determine dans quelles conditions le flux de chaleur critique peut etre depasse sans danger de ‘burnout’ proprement dit.

Special attention is paid to problems raised by the transposition of laboratory results obtained on small samples to a field. Adaptation dans les zones cruciales au regard des changements Considering droplets momentum exchange with air and thanks to droplets diameters and liquid velocities measurements at the nozzle exit, a transient air entrainment model is proposed according to FPIV measurements.

The mathematical properties of this model are thereafter examined.

With a view to determining the changes occurring in gas reactors after cooling accidents, a calculation programme is established for unidimensional gas flows with pressure drops, heat exchanges and in certain cases blowing, in a reticulated lattice.


Under certain conditions oscillations with a period of several seconds and perfectly stable have been observed. To fix the ideas we consider the piston problem and we show that in some cases more conditions must be added to the conservation laws in order to provide sufficient data diphasiqque the unique determination of the propagation process.

This technique is derived in a way such that single phase Riemann solvers may be used: Comme consequences de la theorie de Taylor, une loi de diffusion est etablie et permet de preciser la notion de conductibilite turbulente. Combustion quality in Ecoulemeht Injection Diesel engine depends strongly on the jet atomization in the combustion chamber.

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Both reactive and non-reactive regimes are successfully compared with experimental data in terms of mean temperature and mean and RMS velocities. This thesis is aimed at the validation of models describing these flows with various fluids water, R 11, methanol, ethyl acetate, pure butane, commercial butaneusing a pilot experimental plant.

He has demonstrated not only the role of the relative pressure and of the nature of the components gas and solid but also the relationship between the mobility of the adsorbate and the thermodynamic characteristics of the adsorption.

This dissertation presents a new way to model two-phase flows in pipelines such as pipeline-riser systems. Dans ce dernier cas l’ ecoulement en phase adsorbee bidimensiormelle est un phenomene secondaire dont i1 faut cependant connaitre l’effet sur le facteur de separation.

Effect of the nature of the fluid; Ecoulements diphasiques lors de la vidange de gaz liquefies initialement a saturation. Algorithmes de couplage RANS et ecoulement potentiel.

The results obtained seem to be very consistent in nominal flow but also in partial flow conditions as shown by the qualitative comparisons with test diphaeique. Two-phase flows applications; Developpement d’une methode de suivi d’interface. These microstructures, which are very numerous in granites, imply high but variable matrix permeabilities.

Conventional methods for diphasque flow-rate in screen tubes require complex devices and may disturb the phenomenon under study. The methods developed here may be extended to ionizing shocks.

Centre d’ Etudes Nucleaires, Direction des piles atomiques. Par visualisation en strioscopie on observe les mouvements du film thermique associes a l’amorcage des germes, au depart et a la condensation des bulles; les mecanismes responsables de l’excellent transfert de chaleur ont pu ainsi etre precises. Improvement of heat transfer to gases ecoulrment mean of electric fields ; Etude de l’amelioration des echanges de chaleur dans les gaz au moyen de champs electriques On a pu chiffrer les ordres de grandeur diphasiue accroissements d’echanges observes qui, en convection libre, atteignent a pour cent et, en convection forcee, dependent beaucoup de la vitesse d’ ecoulement.


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 diphawique channels. First, a two-velocity two-pressure model is used, where non-instantaneous velocity and pressure relaxations are applied so that a balancing of these variables is obtained.

les ecoulements diphasiques: Topics by

The same generic numerical scheme is used to impose the ceoulement boundary conditions. Equations generales relatives aux emulsions: The terroir, as production territory organized by producers, is one of the essential conditions for sustainability. Follow their exciting adventure on the blog leslueursdessables.

This happens for superfluid helium as well as for normal helium without main differences on atomization. In particular, we studied the complex dynamics of a transport barrier and we show through a simulation that resonant magnetic perturbations could control relaxation oscillations without a significant loss of confinement.

Such identified terroirs had to be defended: We consider pressure diffusion in fractured media, with application to well test interpretation. Le taux de dissociation est surtout fonction de la temperature de paroi et du debit en masse total d’ammoniac; il depend peu de la temperature d’entree du gaz et est pratiquement independant de la pression.

Cette these se focalise sur le couplage entre une methode d’ ecoulement potentiel tridimensionnelle et des donnees de section bidimensionnelles visqueuses. The main part of this study is devoted to the design of Robin interface conditions and to the formulation of the interface problem.

The studied flow configurations are the fully developed plane channel flow and a flow around a surface-mounted cubical obstacle. They are interpreted using a model relating the gas saturation to the supersaturation, as well as the nucleation rate J.

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