Relevant bibliographies by topics / Interface gaz

Academic literature on the topic 'Interface gaz'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Interface gaz":

1

Imano, Adolphe Moukengué. "Rigidité diélectrique d'un interface gaz–support avec contaminant métallique dans l'air sec et ses mélanges avec le SF6." Canadian Journal of Physics 84, no. 5 (May 1, 2006): 381–98. http://dx.doi.org/10.1139/p06-061.

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In this paper, we conduct a series of experiments aimed at analysing the dielectric properties of compressed dry air, and some SF6–air mixtures up to 700 kPa, under application of AC 50 Hz and lightning impulse (LI) 1.2 μs/50 μs voltage. The investigations were carried out by using a cylindrical spacer model with an adhering particle on the surface under homogenous field conditions. We measure the partial discharges (PD) propagation characteristics under LI voltage stress, as well as the PD inception voltage and the flashover voltage for the contaminated particle. We also investigate the surface charge accumulation on the spacer surface under contaminated particle conditions. The results of the experiments reveal the influence a conducting particle has on the determined flashover field strength, for SF6–air mixtures compared with pure, compressed dry air. This influence is discussed for different particle lengths, but also for three different particle positions in the gap. Pure dry air achieves a higher dielectric strength when the particle gets into contact with the high voltage electrode, under negative LI voltage stress. The same result is obtained for the SF6–air mixtures, when the particle is located in the middle of the gap, as floating electrode on the spacer surface. The reported results contribute to the improvement of the models of breakdown through the interface gas–solid isolator. The application of these models should offer the possibility for considering the use of dry air, or its mixtures with SF6 which, normally have a lower relative global warming potential than pure SF6.[Traduit par la Rédaction]
2

Lakehal, Djamel. "Modélisation des écoulements avec interface gaz-liquide par simulation des grands tourbouillons (LES) des échelles de sous maille." La Houille Blanche, no. 6 (November 2005): 125–31. http://dx.doi.org/10.1051/lhb:200506011.

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Nimmala, Seshu, S. Aria Hosseini, Jackson Harter, Todd Palmer, Eric Lenz, and P. Alex Greaney. "Characterizing Macroscopic Thermal Resistance Across Contacting Interfaces Through Local Understanding of Thermal Transport." MRS Advances 3, no. 44 (2018): 2735–41. http://dx.doi.org/10.1557/adv.2018.485.

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ABSTRACTThermal resistance across the interface between touching surfaces is critical for many industrial applications. We developed a network model to predict the macroscopic thermal resistance of mechanically contacting surfaces. Contacting interfaces are fractally rough, with small islands of locally intimate contact separated by regions with a wider gas filled boundary gap. Heat flow across the interface is therefore heterogeneous and thus the contact model is based on a network of thermal resistors representing boundary resistance at local contacts and the access resistance for lateral transport to contacts. Molecular dynamics simulations have been performed to characterize boundary resistance of Silicon Alumina interfaces for testing the sensitivity of thermal resistance to contact opening. Boltzmann transport simulations of access resistance in Si are conducted in the ballistic transport regime.
4

Zhan, Wei, Andrey Yurievich Kosinskiy, Lasse Vines, Klaus Magnus Johansen, Patricia Almeida Carvalho, and Øystein Prytz. "ZnCr2O4 Inclusions in ZnO Matrix Investigated by Probe-Corrected STEM-EELS." Materials 12, no. 6 (March 16, 2019): 888. http://dx.doi.org/10.3390/ma12060888.

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The ZnCr2O4/ZnO materials system has a wide range of potential applications, for example, as a photocatalytic material for waste-water treatment and gas sensing. In this study, probe-corrected high-resolution scanning transmission electron microscopy and geometric phase analysis were utilized to study the dislocation structure and strain distribution at the interface between zinc oxide (ZnO) and embedded zinc chromium oxide (ZnCr2O4) particles. Ball-milled and dry-pressed ZnO and chromium oxide (α-Cr2O3) powder formed ZnCr2O4 inclusions in ZnO with size ~400 nm, where the interface properties depended on the interface orientation. In particular, sharp interfaces were observed for ZnO [2113]/ZnCr2O4 [110] orientations, while ZnO [1210]/ZnCr2O4 [112] orientations revealed an interface over several atomic layers, with a high density of dislocations. Further, monochromated electron energy-loss spectroscopy was employed to map the optical band gap of ZnCr2O4 nanoparticles in the ZnO matrix and their interface, where the average band gap of ZnCr2O4 nanoparticles was measured to be 3.84 ± 0.03 eV, in contrast to 3.22 ± 0.01 eV for the ZnO matrix.
5

Pantelides, Sokrates T., Sanwu Wang, A. Franceschetti, Ryszard Buczko, M. Di Ventra, Sergey N. Rashkeev, L. Tsetseris, et al. "Si/SiO2 and SiC/SiO2 Interfaces for MOSFETs – Challenges and Advances." Materials Science Forum 527-529 (October 2006): 935–48. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.935.

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Silicon has been the semiconductor of choice for microelectronics largely because of the unique properties of its native oxide (SiO2) and the Si/SiO2 interface. For high-temperature and/or high-power applications, however, one needs a semiconductor with a wider energy gap and higher thermal conductivity. Silicon carbide has the right properties and the same native oxide as Si. However, in the late 1990’s it was found that the SiC/SiO2 interface had high interface trap densities, resulting in poor electron mobilities. Annealing in hydrogen, which is key to the quality of Si/SiO2 interfaces, proved ineffective. This paper presents a synthesis of theoretical and experimental work by the authors in the last six years and parallel work in the literature. High-quality SiC/SiO2 interfaces were achieved by annealing in NO gas and monatomic H. The key elements that lead to highquality Si/SiO2 interfaces and low-quality SiC/SiO2 interfaces are identified and the role of N and H treatments is described. More specifically, optimal Si and SiC surfaces for oxidation are identified and the atomic-scale processes of oxidation and resulting interface defects are described. In the case of SiC, we conclude that excess carbon at the SiC/SiO2 interface leads to a bonded Si-C-O interlayer with a mix of fourfold- and threefold-coordinated C and Si atoms. The threefold coordinated atoms are responsible for the high interface trap density and can be eliminated either by H-passivation or replacement by N. Residual Si-Si bonds, which are partially passivated by H and N remain the main limitation. Perspectives for the future for both Si- and SiC-based MOSFETs are discussed.
6

Lu, Haitian, Ning Zhao, and Donghong Wang. "A Front Tracking Method for the Simulation of Compressible Multimedium Flows." Communications in Computational Physics 19, no. 1 (January 2016): 124–42. http://dx.doi.org/10.4208/cicp.260314.310315a.

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AbstractA front tracking method combined with the real ghost fluid method (RGFM) is proposed for simulations of fluid interfaces in two-dimensional compressible flows. In this paper the Riemann problem is constructed along the normal direction of interface and the corresponding Riemann solutions are used to track fluid interfaces. The interface boundary conditions are defined by the RGFM, and the fluid interfaces are explicitly tracked by several connected marker points. The Riemann solutions are also used directly to update the flow states on both sides of the interface in the RGFM. In order to validate the accuracy and capacity of the new method, extensive numerical tests including the bubble advection, the Sod tube, the shock-bubble interaction, the Richtmyer-Meshkov instability and the gas-water interface, are simulated by using the Euler equations. The computational results are also compared with earlier computational studies and it shows good agreements including the compressible gas-water system with large density differences.
7

Si, Ting, Tong Long, Zhigang Zhai, and Xisheng Luo. "Experimental investigation of cylindrical converging shock waves interacting with a polygonal heavy gas cylinder." Journal of Fluid Mechanics 784 (November 4, 2015): 225–51. http://dx.doi.org/10.1017/jfm.2015.581.

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The interaction of cylindrical converging shock waves with a polygonal heavy gas cylinder is studied experimentally in a vertical annular diaphragmless shock tube. The reliability of the shock tube facility is verified in advance by capturing the cylindrical shock movements during the convergence and reflection processes using high-speed schlieren photography. Three types of air/SF6 polygonal interfaces with cross-sections of an octagon, a square and an equilateral triangle are formed by the soap film technique. A high-speed laser sheet imaging method is employed to monitor the evolution of the three polygonal interfaces subjected to the converging shock waves. In the experiments, the Mach number of the incident cylindrical shock at its first contact with each interface is maintained to be 1.35 for all three cases. The results show that the evolution of the polygonal interfaces is heavily dependent on the initial conditions, such as the interface shapes and the shock features. A theoretical model for circulation initially deposited along the air/SF6 polygonal interface is developed based on the theory of Samtaney & Zabusky (J. Fluid Mech., vol. 269, 1994, pp. 45–78). The circulation depositions along the initial interface result in the differences in flow features among the three polygonal interfaces, including the interface velocities and the perturbation growth rates. In comparison with planar shock cases, there are distinct phenomena caused by the convergence effects, including the variation of shock strength during imploding and exploding (geometric convergence), consecutive reshocks on the interface (compressibility), and special behaviours of the movement of the interface structures (phase inversion).
8

Kim, Kwangeun, and Jaewon Jang. "Polarization-Charge Inversion at Al2O3/GaN Interfaces through Post-Deposition Annealing." Electronics 9, no. 7 (June 30, 2020): 1068. http://dx.doi.org/10.3390/electronics9071068.

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The effects of post-deposition annealing (PDA) on the formation of polarization-charge inversion at ultrathin Al2O3/Ga-polar GaN interfaces are assessed by the analysis of energy band bending and measurement of electrical conduction. The PDA-induced positive interface charges form downward energy band bending at the Al2O3/GaN interfaces with polarization-charge inversion, which is analyzed using X-ray photoelectron spectroscopy. Net charge and interface charge densities at the Al2O3/GaN interfaces are estimated after PDA at 500 °C, 700 °C, and 900 °C. The PDA temperatures affect the formation of charge densities. That is, the charge density increases up to 700 °C and then decreases at 900 °C. Electrical characteristics of GaN Schottky diodes with ultrathin Al2O3 layers exhibit the passivation ability of the Al2O3 surface layer and the effects of polarization-charge inversion through PDA. This result can be applied to improvement in GaN-based electronic devices where surface states and process temperature work important role in device performance.
9

Mkhoyan, K. A., E. S. Alldredge, J. Silcox, and N. W. Ashcroft. "Determination of the Width of the GaN/AlxGa1-xN Heterointerface Using EELS." Microscopy and Microanalysis 7, S2 (August 2001): 216–17. http://dx.doi.org/10.1017/s143192760002715x.

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It is known that wurtzite III-V nitrides are highly polarized in the c-direction, which is usually the growth direction. This polarization (spontaneous and piezoelectric) in GaN/AlxGa1-xN heterostructure field effect transistors (HFET) results in high carrier concentrations at the interfaces, in addition to the large conduction band offset. This high-density 2D electron gas formed at a GaN/AlxGa1-xN heterointerface in its turn increases the mobility of the heterostructure. Therefore, questions about the measurement of the physical width of a GaN/AlxGa1-xN interface and the calculation of its effects on the physical characteristics of devices naturally arise. Since the electrical field distribution, as well as the location and density of the 2D electron gas, depends on the width of the GaN/AlxGa1-xN heterointerface, accurate determination of the width is critical.Measurements with high spatial resolution EELS using transmission electron spectroscopy with a ∽2Å focused electron beam permits atomic-level studies of such specimens.
10

Godin, Oleg A., and Iosif M. Fuks. "Transmission of acoustic-gravity waves through gas–liquid interfaces." Journal of Fluid Mechanics 709 (August 10, 2012): 313–40. http://dx.doi.org/10.1017/jfm.2012.336.

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AbstractIt was demonstrated recently that gas–liquid interfaces, which are usually almost perfect reflectors of acoustic waves, become anomalously transparent, and the power flux in the wave transmitted into the gas increases dramatically, when a compact sound source in the liquid approaches the interface within a fraction of the wavelength (Godin, Phys. Rev. Lett., vol. 97, 2006b, 164301). Powerful underwater explosions and certain natural sources, such as underwater landslides, generate very low-frequency waves in water and air, for which fluid buoyancy and compressibility simultaneously serve as restoring forces. In this paper, analysis of sound transmission through gas–liquid interfaces is extended to acoustic-gravity waves (AGWs) and applied to the air–water interface. It is found that, as for sound, the interface becomes anomalously transparent for sufficiently shallow compact sources of AGWs. Depending on the source type, the increase of a wave power flux into gas due to diffraction effects can reach several orders of magnitude. The physical mechanisms responsible for the anomalous transparency are discussed. Excitation of an interface wave by a point source in the liquid is shown to be an important channel of AGW transmission into the gas, which has no counterpart in the case of sound.
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Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "Interface gaz":

1

Boulesteix, Sylvain. "Cisaillement d'une interface gaz-liquide en conduite et entraînement de gouttelettes." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/967/.

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Lorsqu'une couche de liquide est cisaillée par un écoulement de gaz plus rapide, des vagues de forte amplitude peuvent alors se former à l'interface et se déplacer à la surface du liquide. Si la vitesse du gaz est suffisante, on peut alors observer que de très nombreuses gouttelettes sont arrachées du sommet de ces vagues. Cette configuration se rencontre notamment dans l'industrie pétrolière, où elle est à l'origine d'une augmentation des pertes de charge dans les pipelines. Un dispositif expérimental a donc été conçu pour l'étude de ces phénomènes, dans le cas d'un écoulement eau-air dans une conduite horizontale de 5cm de diamètre. Des observations à l'aide d'une caméra rapide (6000 images/seconde) nous ont alors permis d'identifier les différents modes par lesquels les gouttes sont entraînées, et de les comparer à la littérature. Le développement de procédures complexes de traitement d'images numériques pour la détection et le suivi des gouttes nous ont également permis de mesurer les tailles, vitesses (axiales et verticales), concentrations et flux massiques des gouttes entraînées pour différentes conditions expérimentales. Une étude statistique de ces différentes quantités a ensuite été menée afin d'étudier le comportement des gouttes, notamment la manière dont elles sont transportées par le gaz environnant. Un modèle permettant de déduire la distribution des tailles de gouttes à partir de celle de leurs vitesses axiales a ainsi pu être proposé. Enfin, grâce à ces mesures, il a été montré que la perte de charge pouvait être obtenue à partir des équations-bilan de masse et de quantité de mouvement des deux phases. Diverses relations ont également été proposées, permettant de très bien prédire le gradient de pression dans notre dispositif expérimental. Bien que celles-ci soient essentiellement semi-empiriques, elles constituent un premier pas vers une modélisation plus phénoménologique du phénomène
When a liquid layer is sheared by a faster gas stream, large-amplitude waves can appear at the interface and travel along the liquid interface. If the gas velocity is large enough, numerous droplets can then be observed to be torn off from the top of the waves. Among others, this configuration can be found in oil industry, where it can lead to an increase of the pressure gradient. We have build an experimental set-up to study these phenomena, for an air-water flow in a 5 cm in diameter horizontal pipe. Visualizations by means of a high-speed camera (6000 fps) then allowed us to identify the different atomization modes for the droplets and to compare them with literature description. We developed complex Digital Image Processing routines for the detection and the tracking of entrained drops. This allowed us to measure their sizes, axial and vertical velocities, concentration and mass flux for different experimental regimes. A statistical investigation of these properties was led in order to study the behavior of drops, and especially they way they are carried on by the gas phase. A simple model allowing to deduce drop sizes pdf from axial velocities pdf was then proposed. Thanks to measurements, we also shown that the pressure gradient in the pipe could be fairly well deduced using mass and momentum balance for both phases. We then proposed different relations allowing to predict correctly this gradient in our experiment, when only gas and liquid injection flow-rates are known. Though these relations are still essentially semi-empirical, it is believed that they represent a first step toward a more phenomenological modeling of these phenomena
2

Morel, Christophe. "Modélisation multidimensionnelle des écoulements diphasiques gaz - liquide : application à la simulation des écoulements à bulles ascendants en conduite verticale." Châtenay-Malabry, Ecole centrale de Paris, 1997. http://www.theses.fr/1997ECAP0543.

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Cette étude comporte en premier lieu une réflexion générale sur la modélisation multidimensionnelle des écoulements diphasiques gaz - liquide. Une nouvelle notion de carte de configuration locale de l'écoulement est proposée. L’effort de modélisation est porté plus particulièrement sur les écoulements dispersés à bulles. La fermeture des termes de diffusion turbulente et de transferts interfaciaux est explicitée dans le cadre d'un modèle à deux fluides. Le modèle K- a été retenu pour la turbulence de la phase liquide. Les équations originales de ce modèle étant particulièrement complexes, une analyse des ordres de grandeurs a été effectuée afin de ne retenir que les termes les plus importants. Par ailleurs, les transferts interfaciaux sont proportionnels à l'aire interfaciale volumique qui est inconnue. Une équation de transport pour cette quantité a été établie à l'aide de deux méthodes différentes. La première méthode, originale, est indépendante du régime d'écoulement considéré. La seconde méthode, basée sur un formalisme statistique, est restreinte à l'étude d'écoulements dispersés. Des relations de fermeture sont également proposées pour les termes dus à la coalescence des bulles et à la compressibilité et la dilatabilité du gaz qui apparaissent dans l'équation d'aire interfaciale volumique. Les différents modèles proposes ont été implantés dans le module tridimensionnel du code CATHARE. De nombreux tests de sensibilité aux constantes intervenants dans ces modèles ont été effectués. Les résultats des simulations ont été comparés aux résultats expérimentaux disponibles dans la littérature et discutés.
3

Thiéry, Régis. "Les systèmes eau-gaz-sels : modélisation des équilibres de phases et application aux fluides géologiques." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_THIERY_R.pdf.

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Les équilibres de phase dans les systèmes eau-gaz-sels jouent un rôle central en géologie, et trois aspects importants de leur modélisation à partir des équations d'état sont développés. Une nouvelle méthode est proposée afin de faciliter le calcul formel des fonctions thermodynamiques. La première application est la description de tous les équilibres de phases à basse température (T < 30°C) dans le système CO2-CH4-N2 à l'aide d'une équation cubique. La reproduction des pressions de saturation a été améliorée sensiblement dans le domaine critique. Associé a un modèle de calcul des densités, ce nouveau modèle permet de déterminer avec précision les propriétés v-x des inclusions fluides. La deuxième application concerne la modélisation des équilibres liquide-gaz des systèmes eau-sels à haute température (T > 100°C) à partir d'un modèle développé avec l'aide de la mean spherical approximation (msa) et décrivant les propriétés thermodynamiques des mélanges d'ions et de dipôles. Le diagramme de phases global a été établi et montre l'influence des paramètres physiques (moment dipolaire, diamètre des ions et des dipôles) sur la topologie des diagrammes de phases. Le modèle msa permet de reproduire de manière satisfaisante les équilibres liquide-vapeur du système H2O-NaCl, à condition de prendre en compte la formation des paires d'ions à haute température (T > 400°C) ou dans les phases de faible densité. La troisième application concerne les équilibres de phases dans les systèmes eau-gaz-sels impliquant des clathrates de gaz à basse température (T < 30°C), qui se forment dans les inclusions fluides et dans les sédiments des marges continentales (leg odp 164). La distribution des hydrates de gaz marins et la nature des fluides associés ont été interprétées à l'aide d'un modèle de stabilité des hydrates et à partir des analyses des fluides échantillonnés
4

Timounay, Yousra. "Rhéologie d'interface liquide/air chargées de grains : vers la consolidation d'un milieu aéré." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1156/document.

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Les mousses liquides sont dans un état métastable. Un moyen de les stabiliser est d’y incorporer des particules solides. Lorsqu’elles sont hydrophobes, ces particules s’attachent aux interfaces liquide-air de la mousse et changent radicalement la rhéologie des films séparant les bulles. L’objectif de cette thèse est d’étudier expérimentalement deux composants élémentaires des mousses chargées en particules, à savoir les films et les bulles. La rhéologie des films particulaires est sondée grâce à des expériences d’éclatement et de compression alors que la résistance des bulles armurées est étudiée en faisant varier leur pression interne. En utilisant l’imagerie rapide, nous montrons d’abord que les particules qui pontent les deux interfaces du film peuvent inhiber l’ouverture d’un trou et que pour les autres configurations, la dynamique de rétraction peut être décrite par un équilibre inertio-capillaire pour des fractions surfaciques en particules <0.6 environ. L’étude de la dynamique de rétraction des films particulaires par Particle Image Velocimetry a permis de les caractériser par une viscosité effective qui diverge à la transition de jamming. De plus, les films particulaires flambent à fraction surfacique en particules élevée indiquant une transition d’un comportement liquide vers un comportement solide. En ce qui concerne les bulles particulaires, nous avons montré l’existence de pressions critiques 10 fois plus grandes que la pression de Laplace avant que les bulles ne se déforment aussi bien en dépression qu’en surpression ; la tension effective dans le plan de la coque granulaire est donc 10 fois plus importante que la tension dans un film liquide. Une fracture, correspondant à l’étirement du film liquide, est par ailleurs observée sur les bulles particulaires en surpression. En adoptant une approche élastique, le critère de Griffith permet de retrouver le bon ordre de grandeur de la pression de fracture
Liquid foams are in a metastable state. One way to stabilize them is incorporating solid particles. When hydrophobic, these particles attach to liquid-air interfaces of the particle-laden foam inducing a drastic change in the rheology of the films between bubbles. The aim of this thesis is to study experimentally two elementary components of particle-laden foams, namely soap films and bubbles. The rheology of particulate films is probed through bursting and compression experiments while the resistance of armored bubbles is studied by inner pressure variations. Using high speed photography, we first show that particles bridging both liquid-air interfaces of a liquid film can resist hole opening and that the retraction dynamics for the other configurations can be described by a balance between inertia and capillarity for surface fractions of particles <0.6 approximately. Then studying the retraction dynamics of particulate soap films by Particle Image Velocimetry, we characterized these systems by an effective viscosity that diverges at the jamming transition. Moreover, buckling is observed at high surface fraction of particles indicating a transition from liquid-like to solid-like behavior. Concerning particulate bubbles, we showed the existence of pressure thresholds 10 times greater than Laplace pressure that need to be exceeded in order to observe a deformation in depression and overpressure experiments; the effective tension in the granular shell is thus 10 times greater that the tension in a liquid film. When inflated, a fracture corresponding to the stretching of the liquid film appears on particulate bubbles. Through an elastic approach, Griffith’s criterion gives the right order of magnitude of fracture pressures
5

Longval-Zhang, Yuying. "Ondes électromagnétiques de surface : application à l'étude de l'adsorption de polymères à l'interface solide-liquide." Paris 11, 1988. http://www.theses.fr/1988PA112044.

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Développement d'une méthode optique adaptée a l'étude des interfaces solide/liquide ou solide/gaz: réflexion totale atténuée en excitation optique du plasmon de surface. Application a l'étude de l'adsorption du polystyrène sur une paroi en bon solvant (toluène) et en solvant thêta (cyclohexane). La cinétique d'adsorption, l'isotherme d'adsorption, l'épaisseur et la concentration moyenne de la couche adsorbée sont comparables à ceux obtenus par ellipsométrie
We have developped an optical method to study the inter­ faces of the solid/liquid or solid/gaz type: attenuated total reflexion in surface plasmon oscillations. We present the theoretical principle of themethod, its experimental systems, and its application to the study of polymer adsorption at a solide/liquid interface. We have realized a general computer programme to analyze the experimental data and adjust the values of the thickness and refractive index of the adsorbed film. We demonstrated that to a first approximation, the variation of the reflectivity at a given incident angle, is proportionnal to the adsorbance. We realized two different experimental systems, one using a mechanical scan of the incident angle, and the other performing angular measurements with an array of photodiodes. To demonstrate experimentally the ability of the system, we chose to investigate the adsorption of polystyrene on silver surface, from solution in a good solvant (toluene), and in a solvant theta (cyclohexane). The results obtained kinetics of adsorption, the adsorption isotherm, the average thickness and concentration of the film, are corn- pared to those observed in ellipsometry and other techniques. The conclusion proposes the perspectives for the development of this powerful technique and its application to various systems
6

Alibert, Clément. "Contrôles physiques, chimiques et biologiques des flux de gaz à l'interface sol-atmosphère." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLE014.

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La maitrise des flux de gaz du sol vers l’atmosphère est d’importance pour plusieurs questions sociétales à forts enjeux. La mesure et l’extrapolation de ces flux est un exercice complexe du fait de leur variabilité spatiale et temporelle. Cette variabilité est liée aux nombreux processus, souvent intriqués, qui contrôlent le transport des gaz dans les sols et à l’interface sol-atmosphère. Un dispositif novateur a été développé au sein d’une plateforme expérimentale pour permettre l’étude des flux de gaz en surface d’une colonne de sol placée en conditions contrôlées, avec un suivi à long terme et à haute résolution de nombreux paramètres. Les mécanismes physiques, chimiques et biologiques responsables des variations des flux de gaz à l’interface sol-atmosphère peuvent ainsi être appréhendés séparément. Cette étude s’est particulièrement attachée aux effets du métabolisme des plantes (évapotranspiration, respiration et photosynthèse) ainsi qu’à la teneur en eau et à la pression barométrique. Ces mécanismes jouent sur le gradient de pression qui contrôle le transport advectif des gaz. Un flux de gaz constant à la base d’un sol peut ainsi montrer des variations transitoires significatives sur des échelles de temps allant de plusieurs heures à plusieurs jours. Un travail de modélisation numérique a été initié bien qu’aucun code ne soit actuellement en mesure de rendre compte du transport diphasique en présence de fronts air/eau avec évaporation. Les nombreux résultats expérimentaux obtenus permettront de valider les développements nécessaires
Mastering gas fluxes from the soil to the atmosphere is important for several high-stakes societal issues. Measuring and extrapolating these fluxes is a complex exercise due to their spatial and temporal variability. This variability is related to the many, often intertwined, processes that control the transport of gases in soils and at the soil-atmosphere interface. An innovative device has been developed within an experimental platform to study gas fluxes at the surface of a soil column placed under controlled conditions, with long-term, high-resolution monitoring of many parameters. The physical, chemical and biological mechanisms responsible for the variations of gas flux at the soil-atmosphere interface can thus be studied separately. This study focused in particular on the effects of plant metabolism (evapotranspiration, respiration and photosynthesis) as well as water content and barometric pressure. These mechanisms affect the pressure gradient that controls advective gas transport. A constant gas flow at the base of a soil can thus show significant transient variations on time scales ranging from several hours to several days. Numerical modelling has been initiated although no code is currently able to account for two-phase transport in the presence of sharp air/water fronts and evaporation. The numerous experimental results will be used to validate the necessary developments
7

Nguyen, Phuc Nghia. "Influence de composés perfluoroalkylés sur des films minces de phospholipides à une interface gaz/eau." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01017445.

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Les fluorocarbures ont un fort potentiel en médecine. Cependant, et en dépit du fait que certaines formulations employant des fluorocarbures sont utilisées en clinique, il n'existe que relativement peu d'études visant à déterminer les interactions entre un fluorocarbure et une membrane de phospholipides. Notre étude concentre à l'interface fluorocarbure/phospholipide, qui représente d'une part un modèle simplifié du surfactant pulmonaire natif dont le composant majoritaire est la dipalmitoylphosphatiylcholine (DPPC), et d'autre part la paroi de microbulles développées comme nouveaux agents théranostiques.Tout d'abord, nous montrons que les fluorocarbures abaissent considérablement la tension interfaciale d'équilibre d'une série de phospholipides et accélèrent fortement leur adsorption. Nous montrons que des oscillations périodiques appliquées à la bulle induisent une transition du film de DPPC vers un état d'organisation plus dense. L'application d'oscillations périodiques permet aussi à la DPPC d'expulser du film interfacial une protéine, l'albumine, dont la présence est souvent liée aux troubles dus au mauvais fonctionnement du surfactant pulmonaire. L'effet des fluorocarbures, qui accélère considérablement l'expulsion de l'albumine par la DPPC, est également étudié. D'autre part, nous avons obtenu des microbulles exceptionnellement stables grâce à une série homologue de phosphates perfluoroalkylés. Nous avons également réussi à former des microbulles couvertes par des nanoparticules magnétiques, tout en gardant les propriétés échogènes des bulles. De telles microbulles offrent un potentiel comme des agents de contraste bimodaux pour l'IRM et l'échosonographie.
8

Bonhomme, Romain. "Étude expérimentale et numérique du passage de bulles de gaz au travers d’une interface entre deux liquides." Phd thesis, Toulouse, INPT, 2012. http://oatao.univ-toulouse.fr/9955/1/Bonhomme.pdf.

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Dans le but de prédire l’évolution d’un hypothétique accident au sein d’un réacteur nucléaire, nous nous proposons au travers de cette étude de comprendre la dynamique de bulles de gaz évoluant dans un bain stratifié constitué de deux liquides superposés. Pour ce faire, un dispositif expérimental muni de caméras à haute cadence a été construit afin d’observer en détail la dynamique de bulles d’air isolées et de trains de bulles traversant une interface séparant deux liquides newtoniens immiscibles initialement au repos. En faisant varier la taille des bulles injectées ainsi que les contrastes de viscosité entre les liquides d’un et quatre ordres de grandeur respectivement, ce dispositif a permis d’observer une grande variété de régimes d’écoulement. Dans certaines situations, les bulles de taille millimétrique restent piégées à l’interface liquide-liquide, tandis que les bulles plus grosses parviennent à traverser l’interface, entraînant une importante colonne de liquide lourd derrière elles. Après que l’influence des paramètres physiques a été qualitativement établie à la lumière de modèles simples, des simulations numériques de plusieurs situations sélectionnées ont été réalisées. Celles-ci ont été menées à partir de deux approches basées sur les équations de Navier-Stokes incompressibles, l’une utilisant une technique de capture d’interface, l’autre une description de type « interface diffuse » de Cahn-Hilliard. Les comparaisons entre les résultats expérimentaux et numériques ont confirmé la fiabilité des prédictions numériques dans la plupart des cas, mais ont également souligné le besoin d’améliorer la capture de phénomènes physiques à petite échelle, en particulier ceux liés au drainage de film.
9

Tijani, Niass. "Instabilités d'interfaces dans un écoulement gaz-liquide à contre courant." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL111N.

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Cette thèse porte sur l'étude de l'écoulement d'un film liquide mince tombant sous l'effet de la gravité, et soumis ou non à un contre-courant de gaz, dans une conduite cylindrique verticale. Un des objectifs principaux est la caractérisation de la forme de la surface de ce film. Pour aboutir aux équations de cette surface, nous utilisons une technique de réduction du nombre des variables et des équations du problème formulé à partir du système des équations de Navier-Stokes et des conditions aux limites. Le modèle qui en découle constitue une généralisation de la plupart des modèles existant dans la littérature et montre que la structure ultime de la surface est une compétition entre les effets de la gravité, de la tension superficielle et du frottement interfacial. L’analyse de la solution de base nous a permis de caractériser la transition du film descendant au film ascendant, qui pourrait en résulter par une variation de débit de l'une quelconque des deux phases. L’étude linéaire de la stabilité confirme les travaux effectués sur le film plan et complète ces derniers grâce à l'analyse des instabilités convectives. La dérivation asymptotique de l'équation de l'amplitude montre que cette dernière est une équation de Schrödinger non linéaire avec un potentiel cubique. Une résolution numérique des équations du modèle nous a permis de caractériser l'évolution des amplitudes des modes instables et de leurs harmoniques. Les comparaisons entre les amplitudes des vagues et leurs célérités, avec les prédictions de la théorie linéaire sont très satisfaisantes. La simulation numérique directe par la méthode des éléments finis a permis de conforter les prédictions de la théorie linéaire. L’analyse des spectres montre un comportement plus complexe des amplitudes par rapport aux solutions de la méthode intégrale. La détermination de la forme locale du champ des vitesses pour un nombre de Reynolds inferieur à 500, constitue un résultat remarquable
10

Hommeril, François. "Etude théorique et expérimentale de la coadsorption sur surface homogène : cas du mélange (Kr, CH4) sur Graphite et MgO." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_HOMMERIL_F.pdf.

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Les données thermodynamiques du mouillage tridimensionnel, appliquées à l'adsorption, considéré comme un phénomène de mouillage bidimensionnel, permettent de schématiser simplement le comportement d'une couche mixte adsorbée. Il apparait que la condensation et le déplacements d'un gaz dans un alliage binaire adsorbé dépendent des potentiels chimiques des phases gazeuses à l'équilibre avec les constituants du mélange et des conditions de condensation des mêmes corps mais en phase pure. La résolution d'un modèle thermodynamique statistique s'appuyant sur l'approximation de Bregg-Williams et la simulation numérique de la coadsorption par la méthode de monte Carlo confirment et affinent ce phénomène. On montre notamment que plus l'affinité électrostatique entre les gaz est forte, plus la lacune de miscibilité est étendue. L'etude expérimentale, menée sur les systèmes Krypton-Méthane adsorbés sur graphite exfolié et MgO, a permis, en confirmant les différents résultats des modèles, de mettre en évidence quelques points remarquables. Ainsi, sur le graphite, l'augmentation de la pression partielle en méthane, induit-elle la démission d'une phase liquide dans un alliage solide constitue du melange krypton-methane. C'est la rétro-fusion bidimensionnelle. Sur le MgO, la nature des phases reste mal définie, mais il a été montré que la solution bidimensionnelle formée s'écarte notablement de l'idéalité
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Books on the topic "Interface gaz":

1

Iliuță, Ion. Reactoare multifazice: Gaz, lichid, solid = Multiphase reactors : gas, liquid, solid. Bucureș̦ti: Editura Academiei Române, 2002.

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Nakano, Yukiko I., Cristina Conati, and Thomas Bader, eds. Eye Gaze in Intelligent User Interfaces. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4784-8.

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Lalauze, René. Physico-chemistry of solid-gas interfaces: Concepts and methodology for gas sensors development. Hoboken, NJ: Wiley, 2008.

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Azzopardi, B. J. Gas-liquid flows. New York: Begell House, 2006.

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Azzopardi, B. J. Gas-liquid flows. New York, NY: Begell House, 2005.

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K, Tovbin I͡U. Theory of physical chemistry processes at a gas-solid interface. Moscow: Mir Publishers, 1991.

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Gatignol, Renée. Mechanical and thermodynamical modeling of fluid interfaces. Singapore: World Scientific, 2001.

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Iguchi, Manabu. Modeling multiphase materials processes: Gas-liquid systems. New York: Springer, 2011.

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Tryggvason, Gretar. Direct numerical simulations of gas-liquid multiphase flows. Cambridge: Cambridge University Press, 2011.

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Tsui, Chak M. A computational model for gas-particle flows with distributed phase interfaces. [Toronto]: Dept. of Aerospace Science and Engineering, Unieristy of Toronto, 1997.

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Book chapters on the topic "Interface gaz":

1

Klein, A., and T. Schulmeyer. "Interfaces of Cu-Chalcopyrites." In Wide-Gap Chalcopyrites, 213–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-31293-5_11.

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Schneider, A., G. Inden, and H. J. Grabke. "Growth Kinetics of Iron Carbide Layers during Gas Carburization." In Interface Controlled Materials, 30–37. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/352760622x.ch5.

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Lourenço, Mirtha A. O., José R. B. Gomes, and Paula Ferreira. "Gas-Organic and Gas-Inorganic Interfacial Effects in Gas/Adsorbent Interactions: The Case of CO2/CH4Separation." In Hybrid Organic-Inorganic Interfaces, 413–58. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527807130.ch9.

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Madhusudana, C. V. "Gap Conductance at the Interface." In Mechanical Engineering Series, 55–77. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01276-6_4.

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Meyer, Matthias, Jürgen Koglin, and Thomas Fries. "Bridging the Gap between Nanometer and Meter." In The Nano-Micro Interface, 89–105. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604111.ch8.

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Ikeda, Katsuyoshi. "Gap-Mode Raman Spectroscopy." In Compendium of Surface and Interface Analysis, 205–9. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6156-1_35.

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Löwenadler, John. "Complementizer-gap phenomena." In Investigations of the Syntax–Semantics–Pragmatics Interface, 359–79. Amsterdam: John Benjamins Publishing Company, 2008. http://dx.doi.org/10.1075/slcs.105.26low.

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Wark, Michael, and Gerd Grubert. "Molecular Sieves with Encapsulated TiO2 Clusters: Materials for the Optical Sensing of Reductive Gas Atmospheres." In Interface Controlled Materials, 154–59. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/352760622x.ch26.

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Baraton, Marie-Isabelle, and Lhadi Merhari. "Nanoparticles-Based Chemical Gas Sensors for Outdoor Air Quality Monitoring." In The Nano-Micro Interface, 225–38. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604111.ch17.

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Suzuki, Hiroharu, Aya Yamada, and Satoshi Fukumoto. "Gap junctional communication regulates salivary gland morphogenesis." In Interface Oral Health Science 2009, 172–73. Tokyo: Springer Japan, 2010. http://dx.doi.org/10.1007/978-4-431-99644-6_37.

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Conference papers on the topic "Interface gaz":

1

Petrov, E. P. "Analysis of Flutter-Induced Limit Cycle Oscillations in Gas-Turbine Structures With Friction, Gap and Other Nonlinear Contact Interfaces." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46188.

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A frequency-domain method has been developed to predict and comprehensively analyse the limit-cycle flutter-induced vibrations in bladed discs and other structures with nonlinear contact interfaces. The method allows, for the first time, direct calculation of the limit-cycle amplitudes and frequencies as functions of contact interface parameters and aerodynamic characteristics using realistic large-scale finite element models of structures. The effects of the parameters of nonlinear contact interfaces on limit-cycle amplitudes and frequencies have been explored for major types of nonlinearities occurring in gasturbine structures. New mechanisms of limiting the flutter-induced vibrations have been revealed and explained.
2

Wang, J. H., and H. L. Yau. "Design of Shroud Interface-Angle to Minimize the Forced Vibration of Blades." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-247.

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The blades with integral shrouds have been used widely in industry. The blades are brought together via the contact of shroud interfaces. Because the angle of shroud interface can alter the damping of the interfaces and the coupling effect among the blades, knowing how to design the shroud angle is important. In this work, the theoretical shroud model was first verified experimentally, and then used to investigate the effect of shroud angle on the resonant responses excited by wake flow. The results show that a small shroud angle is superior than large shroud angle to minimize the resonant vibration. However, a critical static interface preload should be selected to avoid the weak coupling effect.
3

Singh, Dhruv, Xiaohui Guo, Alina Alexeenko, Jayathi Y. Murthy, and Timothy S. Fisher. "Modeling of Subcontinuum Thermal Transport Across Semiconductor-Gas Interfaces." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56427.

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A physically rigorous computational algorithm is developed and applied to calculate sub-continuum thermal transport in structures containing semiconductor-gas interfaces. The solution is based on a finite volume discretization of the Boltzmann equation for gas molecules (in the gas phase) and phonons (in the semiconductor). A partial equilibrium is assumed between gas molecules and phonons at the interface of the two media, and the degree of this equilibrium is determined by the accommodation coefficients of gas molecules and phonons on either side of the interface. Energy balance is imposed to obtain a value of the interface temperature. The problem of heat transfer between two parallel plates is investigated. A range of transport regimes is studied, varying from ballistic phonon transport and free molecular flow to continuum heat transfer in both gas and solid. In particular, the thermal interface resistance (or temperature slip) at a gas-solid interface is extracted in the mesoscopic regime where a solution of the Boltzmann equation is necessary. This modeling approach is expected to find applications in the study of heat conduction through microparticle beds, gas flows in microchannel heat sinks and in determining gas gap conductance in thermal interface materials.
4

Yoshida, Hiroyuki, and Shinichiro Uesawa. "Numerical Simulation of Microparticles Motion in Two-Phase Bubbly Flow." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16393.

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Abstract The radioactive aerosol removal equipment is used as one of the safety systems of nuclear reactors. In this equipment, microparticles of aerosol are removed through gas-liquid interfaces of two-phase flow. The mechanism related to the removal of microparticles through the gas-liquid interface is not precise; a numerical evaluation method of performance of aerosol removal equipment is not realized. Then, we have started to construct a numerical simulation method to simulate the removal of microparticles through gas-liquid interfaces. In this simulation method, a detailed two-phase flow simulation code TPFIT is used as the basis of this method. TPFIT adopts an advanced interface tracking method and can simulate interface movement and deformation directly. Also, to simulate the movement of particles, the Lagrangian particle tracking method is incorporated. By combining the interface tracking method, and the Lagrangian particle tracking method, the interaction between interfaces and microparticles can be simulated in detail. To solve the Lagrangian equations of particles, fluid properties and fluid velocity surrounding aerosol particles are evaluated by considering the relative position of particles and gas-liquid interface, to simulate particle movement near the interface. In this paper, we show an outline and preliminary results of this simulation method.
5

Patel, Ravi S., and Suresh V. Garimella. "Diagnostic Technique for Quantitative Resolution of Three-Dimensional Liquid-Gas Phase Boundaries in Microchannel Flows." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73057.

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The morphology of liquid-gas interfaces in adiabatic two-phase microchannel flow through a transparent acrylic microchannel of 500 μm × 500 μm square cross section is investigated. Water seeded with 0.5 μm-diameter fluorescent polystyrene particles is pumped through the channel, and the desired adiabatic two-phase flow regime is achieved through controlled air injection. The diagnostic technique relies on obtaining particle position data through epifluorescent imaging of the flow at excitation and emission wavelengths of 532 and 620 nm, respectively. The particle positions are then used to resolve interface locations to within ±2 μm in the viewing plane. This technique was previously demonstrated by the authors for a static meniscus in a capillary tube. The complete interface geometry between liquid and gas phases is obtained for operation in the annular flow regime by mapping the interface within individual focal planes at various depths within the channel. The diagnostic technique is shown to successfully locate and measure interfaces between transparent, immiscible fluids in a dynamic microchannel flow environment.
6

Yang, B. D., and C. H. Menq. "Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading: Part II — Prediction of Forced Response and Experimental Verification." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-020.

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In the second part of this paper, the application of the proposed dual-interface model to the prediction of the forced response of a blade constrained by wedge dampers will be presented. When considering cyclic loading, the induced friction forces and contact normal loads are combined so as to determine the effective stiffness and damping of the friction interfaces over a cycle of motion. The harmonic balance method is then used to impose the approximate stiffness and damping of the friction interfaces to a linear structure model of the blade. This approach results in a set of nonlinear algebraic equations that can be solved to yield the forced response of the blade excited by harmonic external forces. The predicted forced response can then be used to optimize a given damper design, namely to determine the dynamic weight at which the maximum reduction of resonant response is obtained. In order to illustrate the capacity of the proposed method and to examine its accuracy, the forced response of a test beam is examined. The prediction is also compared with the results of lab tests to validate the proposed dual-interface friction force model.
7

Jacquet-Richardet, G., F. Moyroud, and T. H. Fransson. "An Influence of Shroud Design on the Dynamic and Aeroelastic Behavior of Bladed Disc Assemblies." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-191.

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Precise non-linear aeroelastic modeling of shrouded bladed-disc assemblies is generally beyond present capacities and analyses often assume that the behavior of the coupled system remains linear and retains a cyclic symmetrical property. In this paper, several models of shrouded assemblies, in the particular case of fully slipping interfaces, are examined and compared. Considering the cyclic symmetrical property of the structure, only the model where shroud segments can slip and propagation relations are applied in the direction normal to the interface plane, should be used. A reduced model based on a direct discretisation of the whole assembly is presented and validated. The application is based on a first stage shrouded fan. The influence of varying the interface shroud angle is examined in terms of frequency, mode shape and aeroelastic damping.
8

Kuball, Martin, James W. Pomeroy, Julian Anaya Calvo, Huarui Sun, Roland B. Simon, Daniel Francis, Firooz Faili, et al. "Novel Thermal Management of GaN Electronics: Diamond Substrates." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48145.

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Microwave and power electronics based on GaN enables the performance of systems and their safe operating area to be driven to ‘extremes’. One of the major issues that then arises is thermal management. This includes heat transfer limitations across interfaces, however also the need of incorporating novel high thermal conductivity materials such as diamond. Thermal parameters of these novel device systems and their implications on the near junction temperature in the devices are not well known. The role of interfaces between the GaN transistor and the diamond substrate, and of the diamond thermal properties themselves near this interface are discussed, and novel thermal characterization approaches, such as enabling fast determination of the thermal resistance on the wafer level, as well as of lateral diamond thermal conductivity, are presented.
9

Zampella, Cody, Mustafa Hadj-Nacer, and Miles Greiner. "Temperature Jump Measurement at Stainless Steel and Helium Interface: Application to Used Nuclear Fuel Vacuum Drying Process." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84848.

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Vacuum drying of nuclear fuel canisters may cause the temperature of fuel assemblies to considerably increase due to the effect of gas rarefaction at low pressures. This effect may induce a temperature-jump at the gas-solid interfaces. It is important to predict the temperature-jump at these interfaces to accurately estimate the maximum temperature of the fuel assemblies during vacuum drying. The objective of this work is to setup a concentric cylinders experimental apparatus that can acquire data to benchmark rarefied gas heat transfer simulations, and determine the temperature-jump coefficient at the interface between stainless steel surface and helium gas. The temperature-jump is determined by measuring the temperature difference and heat flux across a 2-mm gap between the concentric cylinders that contains rarefied helium and compare the results to analytical calculations in the slip rarefaction regime.
10

Schwingshackl, C. W., E. P. Petrov, and D. J. Ewins. "Validation of Test Rig Measurements and Prediction Tools for Friction Interface Modelling." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23274.

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The modelling of friction contact interfaces in structural dynamics attracts much interest in the gas turbine industry. In order to obtain reliable predictions of typical friction interfaces, such as encountered in under platform dampers or blade roots, accurate characteristics of friction interfaces must be provided to the analysis. It must be ensured that a sufficient number of parameters are provided, characterising all aspects of the friction contact, that the values are measured accurately, and that the contact parameters are interpreted and used correctly in the numerical modelling of the contact interfaces. This investigation demonstrates that measured friction coefficient and tangential contact stiffness are sufficient to reproduce the experimental friction interface behaviour and that these two parameters can be measured reliably in the available test rig. In combination with fine nonlinear interface meshes and accurate contact pressure representations, the measured interface behaviour of stick, micro- and macroslip is reproduced with good accuracy. The capability of modelling the microslip behaviour for the contact interface by a multitude of friction contact elements is explored and the effect of the normal stress distribution over the contact area on the microslip is studied.

Reports on the topic "Interface gaz":

1

Cannon, N. S. Retained gas sampler interface volume. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/325210.

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Cannon, N. S. ,. Fluor Daniel Hanford. Retained gas sampler interface volume. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/326431.

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Sergi, Brian, Omar Guerra, Michael Craig, Kwabena Pambour, Carlo Brancucci, and Brian Hodge. Natural Gas - Electric Interface Study. Office of Scientific and Technical Information (OSTI), August 2020. http://dx.doi.org/10.2172/1710142.

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Herrera-Gomez, A. X-Ray Standing Wave Study of the Bi/Gas and Bi/Gap Interfaces. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1454113.

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Minton, Timothy K. Dynamics of Etching at the Gas-Surface Interface. Fort Belvoir, VA: Defense Technical Information Center, January 2004. http://dx.doi.org/10.21236/ada419872.

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Segal, Corin. Solid-Gas Interface Analyses for High Energy Density Fuels Combustion. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada368598.

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Ericson, Sean J., Jeffrey S. Logan, and Daniel Kaffine. Managing the Electricity-Gas Interface: Current Environment and Emerging Solutions. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1547264.

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Cavanagh, R., and D. King. Laser studies of chemical dynamics at the gas-solid interface. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6985638.

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Takeda, Fumihide. Selective reflection of light at a solid-gas interface and its application. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.838.

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Hill, Ryan, Mikhail Shashkov, and Andrew Barlow. Interface-aware sub-scale dynamics closure model for multimaterial cells in Lagrangian gas dynamics. Office of Scientific and Technical Information (OSTI), February 2012. http://dx.doi.org/10.2172/1159556.

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