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

These observations took place chiefly in the region where thermal equilibrium are not yet established. Finalement, une analyse theorique du phenomene est donnee ainsi que les perspectives d’applications. Finally, a theoretical analysis of the phenomenon is given as well as possibilities of application.

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First, we focus on the definition of its weak solutions. On a etabli un modele de variation continue du taux de vide dans un canal. Experimental study of improvement of exchanged power in gases by catalytic dissociation: Shocks in magneto-reactive-gas dynamics with ecoluements to the piston problem; Sur les chocs dans un milieu magnetodynamique reactif avec application au probleme du piston.

Les supraconducteurs en courant alternatif. L’emploi d’une source radioactive externe est un procede simple et courant de densimetrie; il est helas difficile a adapter dans le cas actuel. We introduce an original splitting technique of the system of equations.


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 results. These characteristics are fed into deterministic models that describe fluid flows. Un projet gagnant sur tous les tableaux: Several flow regimes for the two-phase mixing derive from this analysis. The step-I test has already been completed.

les ecoulements diphasiques: Topics by

Oil relative permeabilities are found to be a function of both the gas saturation and the supersaturation. We have achieved the synthesis of these two pieces of information, mean local bubble flux and local velocity, by computing the mean weighed velocity in the tube. Structure of two-phase air-water flows. Controverses sur les sucres [Controversies about sugars. Using suitable numerical methods, we have performed a systematic study of these parameters as a function of the topology of the fracture network and matrix to fracture permeability contrast.

A convergence analysis of a Q1 finite element method with non-boundary fitted meshes is also presented.

When it comes to validating physical models of these flows, the analytical process highlights the main descriptive parameters of local flow conditions: The use of classical wall models having shown some weaknesses as for the estimation of parietal temperature fluctuations, two new approaches are proposed and tested. Depending on the applications planned, it is easy to define different observation scales of diphsiques porous media. The two methods give results in a good agreement especially ecoluements bubble flow.


The used fluids are water and CFC Combustion quality in Direct Injection Diesel engine depends strongly on the jet atomization in the combustion chamber. Under certain conditions oscillations with a period of several seconds and perfectly stable have been observed.

We study two modelling of the immersed boundary. Bloody nipple discharge – Breast cancer – Prognosis An analytical method has been developed and experiments have been carried out in which the two walls of the annular space were heated in such a way as to transmit unequal heat flows.

Former les jeunes chercheurs en vue d’influencer les politiques de This PhD attempts to improve waxy crude oil behaviour understanding thanks to experiment, modelling and numerical simulation in order to predict more accurately time and pressure required to restart the flow. We first establish a hierarchy of two-phase flow models, obtained according to equilibrium hypothesis between the physical variables of each phase.