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Auswahl der wissenschaftlichen Literatur zum Thema „Dynamiques interfaciales“
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Zeitschriftenartikel zum Thema "Dynamiques interfaciales"
Rabaud, Marc. „Dynamiques interfaciales dans l'instabilité de l'imprimeur“. Annales de Physique 19, Nr. 6 (1994): 659–90. http://dx.doi.org/10.1051/anphys:01994001906065900.
Der volle Inhalt der QuelleAcosta, J. L., A. Linares und M. C. Ojeda. „Influence de la structure interfaciale sur les propriétés thermiques et dynamiques de composites de polypropylène á base de sépiolites superficiellement acetalées“. European Polymer Journal 21, Nr. 9 (Januar 1985): 821–24. http://dx.doi.org/10.1016/0014-3057(85)90158-2.
Der volle Inhalt der QuelleDissertationen zum Thema "Dynamiques interfaciales"
Parau, Emilian. „Ondes interfaciales de flexion-gravité et de capillarité-gravité“. Nice, 2000. http://www.theses.fr/2000NICE5439.
Der volle Inhalt der QuelleDe, Soete Franz. „Ecoulement de gouttes couvertes dans une contraction“. Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLS082.
Der volle Inhalt der QuelleThe flow of oil drops in water through a constricted channel is of interest for many applications such as oil extraction or microfluidics. In the literature, the condition of pore clogging under a pressure gradient has been extensively studied for drops and bubbles. The relation between flowrate and pressure involves the difference in Laplace pressures at the front and back of the drop, and thus the interfacial tensions at the front and the back. The presence of species adsorbed on the surface lowering the interfacial tension, such as surfactants or colloidal particles, therefore modifies not only the clogging threshold but also the value of the flowrate above this threshold. The objective of this thesis is to study the flow, under an imposed pressure gradient, of drops whose surface is initially saturated with surfactants (above the CMC) or with particles, through cylindrical constricted capillaries. We show how measurements of flowrate by image analysis can provide measurements of the interfacial tensions. In the case of surfactant-laden drops, we measure an increase in the interfacial tension at the front which results from a competition between the surface expansion effects and the transport by a Marangoni effect. In the case of particle-laden drops, we show that both the velocity of the drop and the radius of the particles adsorbed on its surface control the flow regime. At low velocities, the wetting of oil on the capillary walls is observed at the front of the drop; at larger velocities, the flow depends on the particle size compared to the thickness of the lubricating film, according to this criterion either the occurence of friction of the particles on the channel walls or a viscous lubrication regime are observed. These regimes are responsible for a greater or lesser accumulation of particles at the back of the drop, decreasing the back interfacial tension and giving rise to various mechanisms of interface destabilization. For both systems, we show that the presence of adsorbed species has little effect on the clogging condition. Nevertheless, we measure an increase in the passage time of the drops covered with surfactants or particles, which results from the coupling of interfacial dynamics and flow through the contraction
Martrou, Guillaume. „Dynamique d'interfaces chargées et application aux matériaux fibreux“. Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0296/document.
Der volle Inhalt der QuelleInterfaces between two fluids can lead to various interfacial shape instabilities if an electrical field is applied. Leading, for instance, to micrometric droplets or jets formation. Controlling those instabilities is much-needed for an optimal fabrication of microspheres or microfibers : size, physicochemical properties, dispersion and macroscopic spatial structuring of aggregates of those kind of objects. This diversity is based in the competition between surface tension and gravity forces with gravity during the electrodynamics of fluids under electric field induced by electrical charges, polarization charges, electrical discharges and ionic wind. The experimental thesis deals with two main topics. The first one is a precise understanding of spatiotemporals phenomena occurring in a configuration made of a metallic injector raised to high voltage placed above a liquid bath. We present the formation of an original instability leading to a macroscopic bell-shaped link between both electrodes and its non linear characterization. The bifurcation is subcritical and imperfect. The second topic, based on the experience gained with the first one, is an original method of fabrication of microfibers modified in only one step by wet electrospinning. The chosen electrospun polymer is PSMA and the one used for modification is PEGDA. This study has been realized with a catalyze application context. To do so, fibers has been functionalized with peroxydase (HRP) as the model protein. The results especially show a better temporal stability and possible reuse compared to catalysis with standard methods
Du, Cluzeau Antoine. „Modélisation physique de la dynamique des écoulements à bulles par remontée d’échelle à partir de simulations fines“. Thesis, Perpignan, 2019. http://www.theses.fr/2019PERP0012/document.
Der volle Inhalt der QuelleThe CEA aspires to create a numerical nuclear reactor which requires a great knowledge of two-phase flows. In order to improve our understanding of accidental scenarios, this thesis focuses on studying the complex dynamics of bubbly flows in order to model them. The main challenges of the thesis are to study and model the interfacial forces responsible for the migration of bubbles as well as to propose a model of turbulence in agreement with the current knowledge of the phenomena. In order to achieve these objectives, a statistical database is produced from numerical experiments (direct numerical simulations) of swarms and bubble channels. In this thesis, a new method for interfacial forces modeling is developed. It reveals a new force coined as laminar dispersion force. This force has an important role in bubble migration. It is then modeled and validated on five simulations of bubble channels. Concerning turbulence in bubbly flows, it is comprised of SPT (Single Phase Turbulence), WIT (Wake Induced Turbulence) and WIF (Wake Induced Fluctuations) which characterize distinct phenomena. The SPT is the turbulence produced by the averaged shear, the WIT represent the temporal and turbulent fluctuations due to destabilizations and collective instabilities of wakes, and the WIF reflect the spatial fluctuations generated by the averaged wake and the potential flow around the bubbles. In this thesis, we propose a tensorial three-equations modeling of turbulence, where each contribution has its own closure. The tensorial three-equation model is complete and can be assessed as of now in an averaged calculation code
Barthelet, Pierre. „Dynamique non linéaire des ondes interfaciales entre deux fluides cisaillés“. Toulouse, INPT, 1995. http://www.theses.fr/1995INPT104H.
Der volle Inhalt der QuelleAbi, Chebel Nicolas. „Dynamique et rhéologie interfaciales à haute fréquence d'une goutte oscillante“. Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT043G/document.
Der volle Inhalt der QuelleWe present an experimental study of oscillating drop interfacial dynamics at a wide frequency range, especially at high frequency. A characterization method of drops oscillation dynamics has been developed. The oscillations are generated by imposing low amplitude periodic variation of volume to a drop which is attached to a capillary tip. The present method is based on the identification of the drop eigenmodes and the determination of their frequencies and damping rates. It has been applied to characterize several liquid-liquid systems. Three types of interface have been identified. For interfaces of type 1 (heptane/water without added surfactant), each eigenmode is modelled by a weakly damped linear oscillator. Eigenfrequencies and damping rates are well predicted by the linear theory. Interfaces of Types 2 and 3 are obtained by adding crude oil to the disperse phase. Oil native surfactants (asphaltenes, resins) adsorb on the drop interface and provide the latter with viscoelastic behaviour. For young interfaces (type 2 with aging time below 20 minutes), eigenfrequencies remain well predicted by the theory, which deals with non contaminated interfaces, whereas the measured damping rates are significantly higher than the theoretical values. On the other hand, aged interfaces (type 3) exhibit different eigenmodes, of which eigenfrequencies are much higher than the resonance frequencies measured for the young interfaces. At high frequency, the dynamics of aged interfaces are governed by the elasticity of the network constituted by the crude oil amphiphilic species, while the dynamics of young interfaces are governed by interfacial tension. Freely decaying oscillations of a rising drop in a liquid at rest without added surfactant were also considered. Measured frequencies for the first four eigenmodes are in good agreement with the linear theory. However, measured damping rates are much higher than the theoretical rates for non contaminated interfaces. In fact, residual adsorbed species at the heptane/water interface induce Marangoni effects and thus gradients of interfacial tension. Therefore, vorticity production within the boundary layers is enhanced, which explains the observed increase of the oscillation damping rates
BONFILLON, COLIN ANNIE. „Contribution a l'etude des mousses et des emulsions : dynamique interfaciale“. Paris 6, 1994. http://www.theses.fr/1994PA066826.
Der volle Inhalt der QuelleZANOTTI, JEAN-MARC. „Structure et dynamique de l'eau interfaciale. Role de l'eau d'hydratation dans la dynamique des proteines globulaires“. Paris 11, 1997. http://www.theses.fr/1997PA112063.
Der volle Inhalt der QuelleDeguillard, Estelle. „Simulations de Dynamique Particulaire Dissipative pour le calcul de tension interfaciale dans des systèmes eau/tensioactif/huile“. Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112288/document.
Der volle Inhalt der QuelleThe interfacial tension is a physical-chemical property that numerous industrial areas have an interest of especially the petroleum industry. This property is one of the many which helps to optimize production wells' rate of return. Measuring that property in reservoir's conditions (high pressure and temperature) is highly difficult and led to study water/surfactant/oil systems using molecular modeling. The difficulty to measure that specific physical-chemical property linked to the pressure and temperature conditions in the reservoirs led the scientists to study water/surfactant/oil systems using molecular modeling. This thesis establishes that the Dissipative Particle Dynamics (DPD) is able to study water/surfactant/oil systems. The study of the effect of the variation of the harmonic force's parameters, namely the force constant K and the equilibrium distance r0, demonstrated that their variation can heavily influence the interfacial tension computation. Actually, a subtle balance exists between the intra and inter-molecular interactions, which influences the local structure of the surfactants at the oil-water interface, modifies the interfacial tension and influences the interface stability. It was demonstrated that DPD reproduces the variation of interfacial tension with the bulk surfactant concentration and the effect of the variation of hydrophobicity of models of un-charged surfactants on interfacial tension by mean of their coefficient partition. We established a method to properly study systems containing interfaces where interfacial tension is computed. Prospective work showed that DPD was a good tool to study microscopic phenomenon which can be observed macroscopically like the Ostwald ripening in oil in water emulsions. This is a first step before studying others systems of interest for the petroleum industry such as oil/water emulsion or the adsorption of oil droplets on rock wall
FábIán, Balázs. „Molecular Modeling of Interfacial Phenomena“. Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD041.
Der volle Inhalt der QuelleThe tools of numerical simulation enable the analysis of interfaces at themolecular scale, both in terms of their structure and their dynamic behavior.Thus, in my thesis work, I developed the PYTIM software that includes the mostpopular procedures for interfacial analysis at the molecular level, providing asolid foundation for research work on surfaces and interfaces.Using these methods, I investigated the dynamic behavior of molecules at theinterfaces of different biological and atmospheric systems of interest. Indoing so, I studied the correlation between the dynamics of molecules on thesurface and the corresponding intermolecular interactions. In addition, Iworked on the calculation of pressure profiles in simulated systems. Inparticular, the localization of an inherently non-local quantity, the pressure,represents a considerable technical difficulty. I have shown that the pressureprofiles can be calculated in systems containing point charges via the Harasimacontour with mesh Ewald methods (PME). Moreover, I showed how the rigidconstraints often used in simulations introduce a coupling between thetranslational degrees of freedom and the rotational degrees of freedom. Theconsequence of this coupling is that the kinetic energy tensor is no longerconstant, even in equilibrium systems, which -- if neglected -- can introducesignificant errors in the calculation of the surface tension.The methods developed during my thesis work provided means to study variousproblems, such as the distribution of the surface tension near the interface,the relation between the spinodal pressure and the minimum of the lateralpressure profile. They also enabled the investigation of the possible linksbetween the lateral pressure profiles and the mechanism of action of anestheticmolecules, thus providing a molecular basis for the hypothesis ofCantor.Finally, I also studied gas/solid equilibrium characterizing, by Monte Carlosimulation in the grand canonical ensemble, the trapping of ammonia moleculesin a clathrate under conditions of pressure and temperature representative ofextraterrestrial environments