286 research outputs found

    Steam generators two phase flows numerical simulation with liquid and gas momentum equations

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    International audienceThis work takes place in steam generators flow studies and we consider here steady state three dimensional two-phase (liquid and gas) flows. The main goal is to improve the modeling of kinetic imbalance between the phases. We present a method that solves the mixture (liquid-gas) mass and enthalpy equations, and two momentum equations: one for the mixture and one for the gas. This choice is equivalent of solving the gas and the liquid momentum equations, but it is better suited to the Chorin projection method used for the pressure calculation. Solving two momentum equations instead of solving only the one for the mixture introduces the use of correlations for the gas-liquid friction but avoids the use of a correlation for the drift velocity and opens the way to a finer analysis of the relative dynamic behavior of each phase

    « D’Ille, le fil Eliduc ». Le héros à la croisée des héritages dans Ille et Galeron de Gautier d’Arras

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    Ille est le fils d’Eliduc. L’attribution de cette origine au héros, associée à la désignation de l’œuvre comme un « lai », a suscité de nombreuses réflexions sur la filiation entre le roman Ille et Galeron, composé dans le dernier quart du xiie siècle par Gautier d’Arras, et le lai d’Eliduc de Marie de France. Les intrigues développent en effet toutes deux le « cas d’amour » d’un homme pris entre deux femmes. Que Gautier réactive le souvenir du texte de Marie ou qu’il existe une source commun..

    Dissipation characteristics of quantized spin waves in nano-scaled magnetic ring structures

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    The spatial profiles and the dissipation characteristics of spin-wave quasi-eigenmodes are investigated in small magnetic Ni81_{81}Fe19_{19} ring structures using Brillouin light scattering microscopy. It is found, that the decay constant of a mode decreases with increasing mode frequency. Indications for a contribution of three-magnon processes to the dissipation of higher-order spin-wave quasi-eigenmodes are found

    "Celui qui le jaiant ocist". Réflexions sur le nom et ses substituts dans le Chevalier au lion

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