Literatura científica selecionada sobre o tema "Surfondues"
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Artigos de revistas sobre o assunto "Surfondues"
Coquillat, Sylvain, Véronique Pont, Mickaël Pardé, Michaël Kreitz, Dominique Lambert, Ronan Houel, Didier Ricard, Eric Gonneau, Pierre de Guibert e Serge Prieur. "Découverte d'une anomalie électrique dans des orages méditerranéens". La Météorologie, n.º 120 (2023): 046. http://dx.doi.org/10.37053/lameteorologie-2023-0016.
Texto completo da fontePERSONNE, P., e C. DUROURE. "INFLUENCE DE LA RUGOSITE DU GIVRE SUR SA CROISSANCE PAR LA CAPTATION DES GOUTTES D'EAU SURFONDUE : APPLICATION AU GIVRAGE DES CABLES ELECTRIQUES". Le Journal de Physique Colloques 48, n.º C1 (março de 1987): C1–389—C1–395. http://dx.doi.org/10.1051/jphyscol:1987154.
Texto completo da fonteTeses / dissertações sobre o assunto "Surfondues"
Alary, Thomas. "Étude de l'impact de gouttes surfondues sur une paroi". Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0008.
Texto completo da fonteFlight safety is a prerequisite in aeronautics and icing is one of the main sources of incidents. The accretion of ice created by the collision of supercooled water drops in clouds can deteriorate the aerodynamic performance of the aircraft, obstruct sensors or damage engines. It is therefore essential to understand the phenomenon of water droplet impact in icing conditions to be able to predict the amount of ice that can form and to ensure sufficient sizing of ice protection systems. This phenomenon has been extensively studied in the literature but only for low drop impact speeds. ONERA's new icing wind tunnel has allowed access to drop impact regimes more in line with the reality encountered by aircraft. This thesis focuses on the impact of a water drop on a wall for Weber and Reynolds numbers that vary respectively from 15,000 to 170,000 and from 11,000 to 45,000. The study of the impact of the water drops was carried out thanks to a detection and visualization system of those then with a Phase Doppler Analyser to characterize the secondary drops created during the impact. The impact on a dry and horizontal surface was studied but other parameters such as the impact angle, the surface condition, the gas pressure, the temperature were studied to quantify their influence on the splashing. It was shown that for the investigated Reynolds and Weber number ranges, the splashing result depends on the surface properties but also on the air properties. Low air pressure or the presence of ice on the wall promotes the formation of a fluid corona that splashes off after impact. The measurement campaign with the PDA has shown that the secondary drops generated during a corona splash are larger than for a prompt splash. The impact model of Riboux and Gordillo, which attributes the splashing to an aerodynamic force exerted on the fluid that spreads during the impact, allows to describe the splashing well. A second series focusing on the ice forms obtained during the impact of SLD allowed to validate the new constants of the deposition rate model of Trontin and Villedieu determined thanks to new data from the literature
Stiti, Mehdi. "Modélisation et développement de diagnostics optiques pour la caractérisation de gouttes surfondues en écoulement ou en interaction avec un substrat sous-refroidi". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0120.
Texto completo da fonteIcing phenomena that occur on aircraft in flight can be a major hazard in aeronautics. The main resulting safety problems are reduced visibility, pitot tube blockage and reduced aerodynamic performance. In this context, aircraft must be certified for various icing conditions likely to be encountered, particularly in relation to the presence of supercooled droplets with diameters greater than 50 µm in the atmosphere. The certification stages are carried out using standardised icing wind tunnel tests that make it possible to recreate aeronautical icing conditions close to those encountered in flight. The objectives of the work presented in this manuscript concern the implementation of a new optical technique based on Laser-Induced Fluorescence (LIF) for the characterization of supercooled droplets: temperature, detection of their states (i.e. liquid, solid or mixed), characterization of drops in mixed phase and dynamic of the solidification front in a droplet impacting a subcooled substrate. A first LIF technique, using two fluorescent tracers and three spectral bands of detection, allows to measure the temperature of supercooled droplets in flow as well as to estimate the fraction of ice contained in a population of droplets in flow. Measurements carried out in conditions similar to those encountered in aeronautics were performed in an icing wind tunnel of the DGA Essais-Propulseurs and showed the difficulty of reproducing real aeronautical icing conditions (droplets in thermal equilibrium with the carrier phase). A second technique based on Laser Induced Fluorescence Fast Imaging (PLIF) was developed to study the solidification of a droplet impacting a subcooled substrate. This new PLIF method provides, for the first time, access to the dynamics and morphology of the solidification front inside the droplet.The study focused on droplet impacts on a dry substrate and on a substrate covered with an ice layer. The second case allows to get rid of the phenomenon of water supercooling and thus of the random character of the solidification triggering. The measurements showed that the evolution of the solidification front and the characteristics of the tip formed by the droplet at the end of solidification were dependent on the nature of the substrate (thermal conductivity) and the angle of contact between the droplet and the substrate
Dehaoui, Amine. "Viscosité de l'eau surfondue". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10172/document.
Texto completo da fonteWater is an omnipresent liquid, indeed secrets of water are uncountable. In the water case, the behaviour of many thermodynamical and dynamicalquantities is very different from other standard liquids. This difference is more important in the supercooled state. In this thesis we focus on the viscosity of the heavy and light water into the supercooled state at atmospheric pressure. To do this we use the differential dynamic microscopy method. We were able to measure the viscosity to -34 C for light water and -25°C for heavy water. These viscosity measurements correlated to measurements of self-diffusion coefficient allowed us to confirm the existence of a so-called anomaly violation Stokes-Einstein
Maabou, Serge. "Eau surfondue et (bi)polarons dans les nanostructures". Angers, 2006. http://www.theses.fr/2006ANGE0023.
Texto completo da fonteWe investigate the presence of dynamical heterogeneities in supercooled water with molecular dynamics simulation. The new water model TIP5P proposed by Mahoney and Jorgensen which reproduces well water properties is used. We validate our simulation by a compartive study of our results and those obtained in experiments. Thereafter, We show the existence of dynamic heterogeneities in supercooled water. We then studied dynamic aggregations of the molecules of different mobilities and find a string-like dynamics for the most mobile molecules and also dynamical aggregation of the least mobile molecules. The two kinds of dynamical aggregation appear however to be very different. We observes two different times characteristic associated to the two types of heterogeneities. Many sizes of boxes are used for simulations and we show the finite size effect on static and dynamic properties of supercooled water. In the second part of this work, we studied the properties of the charge carriers in mesoscopic structures type OD, 1D, 3D. Using Feynman variational method we carry out theoretical calculations of the characteristics (energy and mass) of the (bi)polaron in nanostructures. We obtain the relation between these characteristics, radius, anisotropy and the Fröhlich electron-phonon coupling constant. By numerical optimization, we obtained that the ground state energy and mass of (bi)polaron increase with the coupling constant and confinement frequency. We developed a theory of photoluminescence assisted by phonons in a spherical nano crystal for various mechanisms of interaction between the electrons and the phonons
Brun, Coralie. "Des liquides surfondus aux verres : étude des corrélations à et hors équilibre". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00664998.
Texto completo da fonteRibeiro, Joao-Paulo. "Contribution à l’étude thermique et dynamique de la cristallisation de l’eau surfondue". Pau, 2007. http://www.theses.fr/2007PAUU3027.
Texto completo da fonteSince the confirmation of the refrigerants contribution to the environmental problems, techniques develop to reduce their impact, in particular by the use of a secondary fluid in refrigeration plants. Among the methods of production of such a fluid, there is that based on the crystallization of water at the supercooling breakdown. In order to control the performances of them, knowledge on the phenomenological aspects of supercooling breakdown are necessary, and more particularly on the dynamic and thermal effects. In this context, the work presents experimental studies on the supercooling breakdown. Initially, visualizations allowed to observe the way in which ice slurry is obtained. In the second time, a study of the crystallization of a mass of water subjected to various degrees of supercooling in a capillary channel permit to analyze the thermal aspect of the phenomenon and the dynamic evolution of the interface liquid-solid. In a last part, the development of a model describing the thermal and dynamic phenomena which appear at the supercooling breakdown is presented
Zouzou, Nichet Alexandre. "Modélisation de la congélation d'un film fluide soumis à une précipitation surfondue /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1996. http://theses.uqac.ca.
Texto completo da fonteSimard, Luc. "La production d'eau surfondue dans un évaporateur hélicoïdal exploitant l'ébullition par film mince". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ42015.pdf.
Texto completo da fonteAubry, Clémantyne. "Multiplatform radar-lidar synergistic retrieval for liquid and mixed-phase clouds". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASJ008.
Texto completo da fonteClouds play an important role in the Earth's water cycle and radiation balance, and tend to cool the climate slightly. However, there are still many uncertainties about their feedbacks and their evolution in the context of global warming. In particular, mixed-phase clouds account for a significant proportion of the cloud radiative effect. They are composed of a mixture of ice crystals, supercooled water droplets and water vapor. This coexistence involves complex processes and the fraction of liquid and ice significantly affects their radiative properties. This complexity makes them difficult to represent in numerical models, which introduces significant biases. For this reason, it is crucial to better understand the microphysical processes of these clouds to reduce the uncertainties in climate and weather forecasts.To observe clouds, several instrument types exist, such as in situ probes (in direct contact with the hydrometeors) and remote sensing instruments (remote observations). Radar and lidar allow us to obtain distance-resolved information. They can be deployed onboard aircraft or satellites, providing regional and global coverage. Cloud radars work at frequencies (35 and 95 GHz) at which the reflectivity is sensitive to particle size, implying higher reflectivity for large cloud particles (ice crystals) than for small particles (water droplets). Lidars, on the other hand, usually operate between 355 and 1064 nm and are generally more sensitive to particle concentration. As a result, lidar backscatter is higher for highly concentrated particles, such as water droplets. Their synergy allows us to take advantage of the strengths and weaknesses of each instrument to retrieve cloud properties. However, these properties are not directly accessible from measurements and retrieval algorithms are therefore used to relate measurements to microphysical properties.This thesis proposes a new radar-lidar synergistic method dedicated to retrieve supercooled water, ice and mixed-phase cloud properties. Based on an existing method dedicated solely to ice clouds, a new approach has been developed to include both supercooled water and mixed-phase situations. The first step was to adapt and improve the classification used to identify the nature of the observed particles. Next, numerous adaptations have been applied to the algorithm to retrieve separately ice crystals and supercooled water properties. This approach is based on the different sensitivities of radar and lidar to the two types of hydrometeors: ice crystals dominate the radar signal while supercooled water dominates the lidar signal.To assess this new method, the retrievals are compared to in situ measurements from co-located observations and the literature. The first study compares retrievals from CloudSat-CALIPSO satellite data with collocated in situ airborne measurements. This comparison shows that the radar-lidar retrievals follow the same trend as the in situ measurements and provide promising results with mean percent error of 49 % for liquid water content and 75 % for ice water content, despite the quite different measurement scales and imperfect collocation. Additionally, this has been applied to the French and German airborne platforms RALI and HALO. These first results are promising and the collocated in situ data collected during recent campaigns can be used to further assess the algorithm and improve its parameterization
Dufour, Jacques. "Développement d'un dispositif de viscosimétrie par cisaillement téléscopique : application à l'étude des liquides sous refroidis". Lyon 1, 1996. http://www.theses.fr/1996LYO10003.
Texto completo da fonteLivros sobre o assunto "Surfondues"
(Editor), Andrea J. Liu, e Sidney R. Nagel (Editor), eds. Jamming and Rheology: Constrained Dynamics on Microscopic and Macroscopic Scales. CRC, 2001.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Surfondues"
"A.1. L’alternative cristal – liquide surfondu". In Le verre, 297–318. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0248-7-049.
Texto completo da fonte"A.1. L’alternative cristal – liquide surfondu". In Le verre, 297–318. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0248-7.c049.
Texto completo da fonte