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Статті в журналах з теми "Étanchéités"
Pugnet, J. M., A. Gelin, and D. Tricot. "Influence des étanchéités sur le comportement vibratoire des compresseurs centrifuges." La Houille Blanche, no. 3-4 (June 1998): 117–22. http://dx.doi.org/10.1051/lhb/1998048.
Повний текст джерелаKhelalfa, Raouf, Jean-Sylvestre Darrozès, and Jean-Félix Durastanti. "Étanchéités statiques des écoulements de filtration au voisinage du point critique." Mécanique & Industries 12, no. 2 (2011): 123–30. http://dx.doi.org/10.1051/meca/2011009.
Повний текст джерелаLefebvre, Marie-Thérèse. "Porosité des pratiques. Étanchéité du discours." Globe 15, no. 1-2 (March 6, 2013): 65–81. http://dx.doi.org/10.7202/1014626ar.
Повний текст джерелаMonteil, J. B., and G. Schorsch. "Collage et étanchéité avec les silicones." Matériaux & Techniques 78, no. 11 (1990): 13–15. http://dx.doi.org/10.1051/mattech/199078110013.
Повний текст джерелаGenser, L., C. Poitou, E. Brot-Laroche, M. Rousset, S. Thenet, and A. Leturque. "La perméabilité intestinale dans les maladies métaboliques : porosité, ou étanchéité ?" Médecine des Maladies Métaboliques 9, no. 1 (February 2015): 11–17. http://dx.doi.org/10.1016/s1957-2557(15)30004-3.
Повний текст джерелаMezin, A., J. Lepage, N. Pacia, and D. Paulmier. "Étanchéité à l’hydrogène de revêtements de molybdène. Évolution sous sollicitation mécanique." Matériaux & Techniques 78, no. 1-2 (1990): 19–24. http://dx.doi.org/10.1051/mattech/199078010019.
Повний текст джерелаAbbes, Claude, and Christian Rouaud. "Le point de vue du concepteur : La maîtrise de la fonction étanchéité." Revue Générale Nucléaire, no. 6 (November 1991): 433–34. http://dx.doi.org/10.1051/rgn/19916433.
Повний текст джерелаBertrand, Denis, and Veronica Estay Stange. "Transversalité du sens et relations interartistiques : l’héritage greimassien." Semiotica 2017, no. 219 (November 27, 2017): 315–33. http://dx.doi.org/10.1515/sem-2017-0070.
Повний текст джерелаBrunelle, Dorval, Yves Bélanger, and Christian Deblock. "L’intégration économique continentale et ses effets sur les gouvernements infra-étatiques : de l’ALE à l’ALENA et au-delà." Cahiers de recherche sociologique, no. 32 (May 3, 2011): 85–117. http://dx.doi.org/10.7202/1002400ar.
Повний текст джерелаBouteloup, Claire. "40 ans après l’Amoco Cadiz : science et militance." Natures Sciences Sociétés 27, no. 1 (January 2019): 82–88. http://dx.doi.org/10.1051/nss/2019023.
Повний текст джерелаДисертації з теми "Étanchéités"
Nguyen, Manh Hung. "Analyse des étanchéités annulaires à bague flottante." Poitiers, 2011. http://www.theses.fr/2011POIT2255.
Повний текст джерелаThe annular floating ring seals can significantly reduce the leakage in rotating machines operating with gas or cryogenic fluids. Their integration into the machine is not simple because the floating ring must be able to follow the vibrations of the rotor. The presented work has two parts. The first part consists of the analysis of static and dynamic behavior of the annular seal which forms the primary seal. The model developed is based on the theory of thin lubrication films dominated by inertia effects together with a total enthalpy form of the energy equation. This model can handle the phase change in cryogenic fluids. The dynamic response of the annular seal is expressed as the linear dynamic coefficients (derived for small perturbations). The dynamic coefficients vary with the operating regime of the seal ring (eccentricity, upstream / downstream pressure, rotation speed) but do not depend on the excitation frequency. The second part is dedicated to the development of a dynamic model. The floating ring is subject to forces generated by the fluid flow in the annular (primary) seal, the mixed friction forces between its nose and the stator (the secondary seal is similar to a mechanical face seal) and the inertia forces caused by its own weight. The rotor acts as an external excitation. A suitable model is developed for each of these forces. Two dynamic models are proposed. The first model is based on the assumption that the floating ring follows the rotor according to a periodic precession motion. This model allows a simple and fast quasi-analytical solution but is limited by the fact that the dynamic response of the ring may be more complex. The second model is fully nonlinear and takes into account the possible impacts between the rotor and the ring and between the ring and the anti-rotation pins. The model shows that under certain conditions the trajectory of the ring can be quasi-periodic or chaotic. Overall, the results of the second part underline design rules for properly integrating annular floating ring seals into a rotating machine
Rouillon, Mathieu. "Modélisation et caractérisation expérimentale des étanchéités faciales hydrodynamiques." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2267/document.
Повний текст джерелаThe main objective of this thesis is to study, through a numerical model and experimentations, the performance and behaviour of different spiral groove face seals, usually used for gas applications, in the case of liquid lubrication. The aim of this work will be to evaluate the eventuality to replace smooth mechanical face seals used in liquid cryogenic turbopumps space rocket applications by spiral groove face seals.The literature presents different theoretical and experimental studies on surface texturing, two-phase flow and turbulence. These last two points may appear when sealing a cryogenic fluid. A numerical model has been developped in finite elements. It solves the Reynolds equation and the energy equation into the fluid film. This equation is expressed using the enthalpy and can thus be used in case of homogeneous fluid phase change. Fluid/structure coupling is considered to obtain thermoelastic deformations of the solids. The next part of this study is dedicated to experiments with water lubricated spiral groove face seals with different groove depths. A comparison with smooth face seals has been done showing that the friction torque of the spiral groove face seals is lower than the smooth face seals one. On the other hand, the spiral groove flow rate is higher. Sharp changes in behaviour such as, laminar to turbulent transition from a Reynolds number equals to 1500, or two-phase flow at low pressure, high angular speed and supplying temperature of the fluid, are observed. The last part compares the thermoelastohydrodynamic theoretical model to experimental results in laminar flow, for one-phase and two-phase flow. The model is able to capture the experimental findings. Even if some convergence difficulties are encountered in two-phase flow, the model can be used for seal design in industrial applications
Minet, Christophe. "Lubrification mixte dans les étanchéités dynamiques : application aux garnitures mécaniques d'étanchéité." Poitiers, 2009. http://theses.edel.univ-poitiers.fr/theses/2009/Minet-Christophe/2009-Minet-Christophe-These.pdf.
Повний текст джерелаMechanical face seals are commonly used in industrial applications. The main purpose of these components is to insure the sealing of rotating shafts. A mechanical seal is basically a set of two rings whose contact is lubricated by the sealed fluid. The optimal point of operation is reached by minimizing both leakage and wear. The average film thickness is then about one micrometer and the seal is operating in mixed lubrication conditions. In this case, the faces are not completely separated by the fluid film and asperity contact occurs. The choice of a deterministic approach was justified from a detailed bibliographical analysis. An accurate description of the surfaces roughness was required, as well as the development of a numerical modelling tool able to simulate it. A metrological study was realised on samples of mechanical seal surfaces at several stages of operation. The statistical parameters obtained from the surfaces roughness could thus be evaluated and used in a numerical model enabling the generation of non Gaussian surfaces. A deterministic flow model for mixed lubrication in mechanical seals is then presented. It takes the cavitation effects and normal hertzian asperity contact into account. The equation of flow rate conservation in the contact was solved using finite volume method. A parametric study was carried out on four statistically equivalent simulated surfaces. The model highlights the increase in load capacity due to the roughness, although the mean surfaces are flat and parallel. Stribeck curves have been obtained for each studied case. The standard deviation of the roughness is the major parameter influencing the coefficient of friction. Furthermore, the development of microcavitation, which mostly depends on the roughness distribution, influences the results to a great extent
Touze-Foltz, Nathalie. "Modélisation des transferts advectifs dans les étanchéités composites de centres de stockage de déchets." Paris, ENMP, 2001. http://www.theses.fr/2001ENMP1038.
Повний текст джерелаGeomembranes of composite liners often exhibit holes representing preferential advective flow paths for leachate. Various authors have developed mathematical models and empirical equations in order to interpret flow rates due to advective transfers obtained in the laboratory and extrapolate them to field conditions, for steady-state flow, unifrom interface transmissivity, and saturated soils and interfaces. Limits of validity of these mathematical models and empirical equations were determined for a uniform interface transmissivity. But the transmissivity proves to be non-uniform. The work performed thus consisted in studying the influence of this non-uniformity on flow rates thanks to analytical equations and experimental devices. The influence of the respective location of the hole in the geomembrane as well as the spatial repartition of transmissivity. For this latestt point two methods were used during the PhD in order to describe geomembrane and compacted soil surfaces topography
Touze-Foltz, Nathalie. "Modélisation des transferts advectifs dans les étanchéités composites de centres de stockage de déchets." Paris, ENMP, 2001. http://www.theses.fr/2001ENMPA001.
Повний текст джерелаBerger, Sébastien. "Etude du comportement dynamique non linéaire d'un rotor monté sur éléments fluides : caractérisation des étanchéités ; influence de la butée." Poitiers, 1999. https://tel.archives-ouvertes.fr/tel-00204946.
Повний текст джерелаjolly, pascal. "Contribution à l'étude du changement de phase liquide-vapeur dans des capillaires micrométriques en vue des applications aux étanchéités statiques." Phd thesis, Université de Poitiers, 2004. http://tel.archives-ouvertes.fr/tel-00008547.
Повний текст джерелаJolly, Pascal. "Contribution à l'étude du changement de phase liquide-vapeur dans des capillaires micrométriques en vue des applications aux étanchéités statiques." Poitiers, 2004. http://www.theses.fr/2004POIT2274.
Повний текст джерелаThe matter of this work is the comprehension of liquid-vapor phase change phenomenology in micrometric paths that remain from the contact of two rough surfaces in a static gasket. The main objective is to evaluate the consequences of boiling on flow rate value. The leakage path is supposed to be a capillary tube, of micrometric diameter. Inlet and outlet pressures correspond respectively to liquid phase and vapor phase. Boiling occur when the local pressure falls below the saturation pressure during the liquid flow. Besides, no heat is carried out to the fluid. Conservation and interfacial equations are written in a non dimensional form in order to identify, by a phenomenological analysis, the preponderant mechanisms of boiling of R134a in confined space. It is shown that phase change occurs by heterogeneous nucleation and that the growth of the resulting vapor bubble is controlled by thermal phenomena. An experimental facility is designed for the visualization of boiling in glass capillary tubes of circular cross section whose diameter is comprised in the range 20 to 100 æm. Experimentations are ruled by a protocol that includes three steps. The steps 2 and 3 correspond to a situation of phase change, but with different initial conditions. During the second step, evolution of the vapor phase is measured, with a webcam or a fast cam. This enables to estimate the repercussion of boiling on leakage flow rate. During the third step, despite the fact that the outlet pressure is much smaller than the saturation pressure, no boiling bubbles are observed in the capillary
Bannour, Hajer. "Evalution des transferts advectifs à travers les étanchéités composites géomenbranes-géosynthétiques bentonitiques des barrières de fonds d'installations de stockage de déchets." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU048/document.
Повний текст джерелаGeomembrane (GM)-geosynthetic clay liner placed in bottom landfill barriers could be faced to advective transfers caused by the appearance of GM defects. Leachate could percolate naturally through the GCL; penetrate the soil and the ground water which could result in environmental damage. It's therefore important to understand leakage transfer mechanism though GM-GCL composite liners and quantify them in order to be aware, to master and to minimize advective transfer impact through the barrier to the environment. However, the GM is not accessible in bottom land fill liner which makes it harder to correctly estimate leakage through the composite liner. The present work used to evaluate advective transfer through GM-GCL composite liner via an experimental and numerical approach. This work used also to ameliorate the comprehension of leakage transfer mechanisms as a function of external solicitations compared to the literature. The purpose of this study was thus to properly identify advective transfer problem through composite liner by highlighting the main parameters affecting advective transfers through composite liners (confining stress, heterogeneity of the GCL composition, contact quality at the GM-GCL interface, chemical and physical alteration during its service life). Those parameters influence the whole barrier performances and material characteristics evolution were studied. Experimental program was dealing with acquiring water retention data of GCL by introducing state surface concept under the confining stress generated by the waste. It has been found that confining stress used to reduce GCL swelling facilities while hydrated and consequently lead to the decrease of the saturated hydraulic conductivity. This result emphasizes on landfill conception recommendations based on rapidly covering the GCL in in order to acquiring its watertightness capabilities. This experimental study was reinforced by a numerical computation study dealing with water transfer through composite liner due to a GM defect and a hydraulic head with considering the heterogeneity of the GCL. This numerical study highlighted new phenomena regulating flow rate through composite liners consisting of geotextile deaturation due to high suction performed by the bentonite as part of the GCL. Indeed, in addition to containing the bentonite and providing tensile shear stresses, the geotextile contribute to reduce the flow rate through composite liner thanks to its high hydraulic conductivity while desaturated. Interface transmissivity tests were also carried for different composite liners combinations. Measurements concluded that neither external solicitations resulting from chemical and physical alteration conducting to the increase of the hydraulic conductivity of the GCL nor the quality of the GM (in relation with its roughness, rigidity and thickness) significantly affect advective transfer through composite liners at the steady state. However an effect was highlighted during transient state. A synthetic approach was thus given to summarize composite liners transfers mechanism and anticipate environmental impact of its leakage. It was later confirmed that the bentonite swelling contributes also to flow rate reduction through composite liner regardless of the bentonite nature and granulometry. In addition, it has been concluded that the transient state within which flow rate reduction though has been observed must be taken into consideration to realistically predict flow rate leakage through composite liners
Minet, Christophe. "Lubrification Mixte des Etanchéités dynamiques : application aux garnitures mécaniques d'étanchéité." Phd thesis, Université de Poitiers, 2009. http://tel.archives-ouvertes.fr/tel-00441030.
Повний текст джерелаКниги з теми "Étanchéités"
Lyberg, Mats. Determination of air leakiness of building envelopes using pressurization at low pressures. Stockholm: Swedish Council for Building Research, 1989.
Знайти повний текст джерелаPetrone, Mario V. Pare-air rigide. Ottawa, Ont: Société canadienne d'hypothèques et de logement, 1995.
Знайти повний текст джерелаCanada. Office de l'efficacité énergétique., ed. La réduction des fuites d'air: Pourquoi devrais-je me soucier des problèmes de fuite d'air? Ottawa, Ont: Ressources naturelles Canada, 2007.
Знайти повний текст джерелаJoining: Understanding the basics. Materials Park, Ohio: ASM International, 2011.
Знайти повний текст джерелаPopielas, Frank. Dana Sealing Products Group embarks on an analysis-led design journey. [New York, N.Y.]: Knovel, 2009.
Знайти повний текст джерелаInsulation handbook. New York: McGraw-Hill, 2001.
Знайти повний текст джерелаC, Chien Calvin, Inyang Hilary I, Everett Lorne G, United States. Dept. of Energy., United States. Environmental Protection Agency., and E.I. du Pont de Nemours & Company., eds. Barrier systems for environmental contaminant containment and treatment. Boca Raton, FL: CRC/Taylor & Francis, 2006.
Знайти повний текст джерелаC, Chien Calvin, Inyang Hilary I, Everett Lorne G, United States. Dept. of Energy., United States. Environmental Protection Agency., and E.I. du Pont de Nemours & Company., eds. Barrier systems for containment and environmental treatment: Advances in performance prediction and verification. Boca Raton, FL: CRC Press, 2005.
Знайти повний текст джерелаGreenhouse, Hal. Hermeticity of electronic packages. Park Ridge, N.J: Noyes Publications, 2000.
Знайти повний текст джерелаHermeticity of electronic packages. Norwich, N.Y: Noyes Publications, 1999.
Знайти повний текст джерела