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Literatura científica selecionada sobre o tema "Gouttes et bulles"
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Teses / dissertações sobre o assunto "Gouttes et bulles"
Debrégeas, Georges. "Drainage, eclatement et etalement de bulles et de gouttes visqueuses". Paris 6, 1997. http://www.theses.fr/1997PA066643.
Texto completo da fonteJiang, Xiaofeng. "Phénomènes interfaciaux dans la manipulation des gouttes et des bulles". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0260/document.
Texto completo da fonteThe interfacial phenomena in multiphase flows widely exist in numerous industrial processes. Drops and bubbles are typical models to investigate these interfacial phenomena. Thus this thesis investigates the drop (bubble) involved interface manipulation, including the breakup of interface, drop’s motion on superhydrophobic surface and Dripping-on-Substrate with an acquisition system of electric signals. In the first part, the pinch-off dynamics of homogenous fluids and heterogeneous ferrrofluids, unconfined liquid-liquid (liquid-gas) or confined liquid-liquid systems was investigated by a high-speed camera. The effect of buoyancy, magnetic force, gravity and interface tension between internal and external fluids on the final pinch-off was demonstrated and quantified. The second part focuses on the drop manipulation on superhydrophobic interface through two distinct approaches: superhydrophobic coating on a substrate and superhydrophobic particles enveloping a liquid drop to form “liquid marble”. The hurdling behavior of liquid drops on superhydrophobic obstacles and undressing dynamics of liquid marbles on oil films were discussed and the slope motion of liquid drops and liquid marbles were then compared. The third part concentrates on the Dripping-on- Substrate behavior: initial contact and spreading on a solid surface, final pinch-off of Newtonian fluids and filament thinning of non-Newtonian fluids, through a methodology combining the high-speed camera and ultra-high-speed acquisition device of an electric signal
Bonometti, Thomas Magnaudet Jacques. "Développement d'une méthode de simulation d'écoulements à bulles et à gouttes". Toulouse : INP Toulouse, 2006. http://ethesis.inp-toulouse.fr/archive/00000195.
Texto completo da fonteBonometti, Thomas. "Développement d'une méthode de simulation d'écoulements à bulles et à gouttes". Toulouse, INPT, 2005. https://hal.science/tel-04582704.
Texto completo da fonteThis work deals with the development of an interface-capturing method aimed at computing three-dimensional incompressible two-phase flows that may involve high density and viscosity ratios and capillary effects. The applications we have in mind concerns chemical engineering as well as environmental problems. We use a front-capturing method to advance the interface but do not perform any explicit reconstruction. We show that the base version of this method results in a smearing of the fronts in regions where the flow undergoes a stray stretching. We propose an improved technique in which the local velocity field within the fronts is modified and the above problem is fixed. This algorithm allows the interfaces to deform properly while maintaining the numerical thickness of the transition region within three computational cells. A detailed study of several aspects of the dynamics of two- and three-phase flows, such as drops in microchannels or hydrodynamic interactions in a bubble swarm, is then performed in both axisymmetric and three-dimensional configurations. The results concerning microfluidics are compared with very recent experiments. Finally, a study of the dynamics of a bubbly suspension involving up to 27 bubbles allow us among other things to enlighten the influence of the bubbles Reynolds number on the velocity fluctuations induced in the liquid
Roa, Antunez Ignacio. "Droplet breakup- Analyse de la rupture de gouttes". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR051.
Texto completo da fonteThe atomization process is influenced by the deformation and breakup of droplets, which in turn affects the final distribution of droplet size. Several authors have related the breakup of droplets due to turbulence to their free oscillations and have shown that even, for low turbulence levels, droplets break due to a resonant mechanism. This phenomenon provides the foundation for the present study.As a baseline of this work, the theoretical linear shape oscillations of droplets are first examined from both theoretical and numerical perspectives.The first-order oscillatory motion of an initially deformed droplet, considering the dynamic effects of the surrounding fluid, is described.Subsequently, the oscillations and breakup of a single, initially unperturbed, spherical liquid droplet subjected to a homogeneous and isotropic turbulent medium are investigated.A theoretical framework for droplet oscillations is developed using a spherical harmonic decomposition that tracks the deformation of the surface from its initial state to just before its breakup as an expansion of each mode of deformation.This approach links the small perturbation amplitude deformation of the droplet to the parameters and properties of the turbulent medium, allowing us to observe how turbulence excites the different modes, ultimately leading to breakup.We relate this phenomenon to linear stability theory and analyse how the droplet lifetime is associated with the turbulence statistics for the ensemble of characteristic values.During droplet deformation, perturbations of different origins favour the growth of liquid structures of various sizes and shapes.Notably, regions exhibiting contraction (bottlenecks) and accumulation (swelling) patterns may indicate potential breakup events.To accurately predict breakup events, it is essential to consider the multiscale nature of these systems.The temporal evolution of the scale distribution is used to identify all the dynamics involved in the deformation process at each scale throughout the droplet's lifetimeThe problem is approached by direct numerical simulation of the two-phase Navier-Stokes equations using the in-house code ARCHER.By combining these three analyses, the lifetime of the droplet is studied in two parts: First, the oscillatory motion and frequency of the different modes present in the deformation through the spherical harmonic framework to shed light on the resonance mechanism. Second, the temporal evolution of the scale distribution through a multiscale analysis at the end of the droplet lifetime
Lagubeau, Guillaume. "Interfaces à grains, et autres situations de mouillage nul". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://pastel.archives-ouvertes.fr/pastel-00555816.
Texto completo da fonteMaleprade, Hélène de. "Textures fonctionnelles : aérophilie, propulsion et friction spéciale". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX035/document.
Texto completo da fonteThis thesis deals with the influence of textures on wetting and propulsion. Three situations have been considered, depending on the texture size.Aerophilic surfaces can be obtained with hydrophobic nanometric structures. When immerged in a liquid bath, these surfaces remain covered by a thin plastron of air. This oppens a new class of problems where gas – liquid interfaces are exchanged, compared to usual studies. We described the spreading of an air bulle over an aerophilic surface, capillary depression and the dynamics of a bubble on a wire.Millimetric sutructures allow an efficient redirection of the air cushion between a levitating object and its substrate. Because the flux is controlled, a specific direction can appear, and the object is efficiently propelled. Depending on the textures location, viscous entrainement or rocket effect can be the propulsive mechanism.Hydrophobic nanotextures are used to generate non-wetting situation of water. A tiny angle of tilt of the surface is enough to see a drop mouving; its velocity is high because of the low friction. Macrotextures, as millimetric crennels slow down very efficiently the drop: the study optimized the control of the drop (possibly viscous) motion
Melich, Romain. "Préparation et caractérisation de microbulles et microgouttelettes par procédés membranaires pour des applications biomédicales ultrasonores". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1353/document.
Texto completo da fonteThe development of various colloidal forms for therapy and diagnosis in ultrasound medical present a great interest for many years. In particular, microbubbles of perfluorocarbon (PFC) are interesting as contrast agents because the gas is a high ultrasound reflector. More recently, PFC droplets have been proposed for news acoustic applications. Indeed, after an acoustic pulse, the ultrasound waves induce a phase change from the liquid state to the gaseous state. This phenomenon is called the acoustic vaporization of droplets. In parallel with the study of new applications, the development of new process offering a better control during production, remains a key issue.Thus, the preparation using news methods based on membrane devices seem to be particularly interesting. The aim of the thesis is the development of new membrane process for the formulation of microbubbles and droplets with a size controlled for ultrasound applications in imaging and therapy. In this work, the direct membrane emulsification with a cross-flow membrane module was used for the preparation of microbubbles stabilized by soluble surfactants, while a microkit module allowed to obtain microbubbles stabilized by phospholipids. In a second step, the membrane emulsification by premix allowed to formulate monodispersed droplets of PFC. For the various colloidal forms prepared, we observed the influence of the process parameters (pressure, flow rate and shear stress), the formulation parameters (surfactants, type of PFC of the dispersed phase) and the membrane parameters (pore size) on the formation of microbubbles/droplets. Subsequently, the acoustic characterization of microbubbles/droplets has shown that these systems have the properties to be used as ultrasonic contrast agents
Dietrich, Nicolas. "Étude locale et expérimentale des Phénomènes interfaciaux". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2008. http://tel.archives-ouvertes.fr/tel-00357211.
Texto completo da fonteDes bulles et des gouttes ont été étudiées expérimentalement depuis leur formation, en passant par leur déformation jusqu'à leur coalescence. La formation de bulles dans des micro-mélangeurs a été étudiée et caractérisée par l'obtention de champs de vitesses. Différents paramètres, tels que le cisaillement, la géométrie de la zone de formation, les débits ou encore les propriétés physiques ont été testés afin de développer des lois d'échelles.
La traversée d'une interface liquide-liquide par une inclusion a été abordée par des expériences originales, permettant de décrire la dynamique du phénomène, de définir des nombres adimensionnels et de mettre en évidence des instabilités interfaciales. L'effet Weissenberg a également été étudié aux différentes échelles afin de comprendre les phénomènes conduisant à son amplification.
Enfin, en milieu viscoélastique et rhéofluidifiant, nous avons caractérisé l'écoulement autour d'une inclusion isolée solide par l'obtention de champs de vitesses. Ces résultats ont permis de confirmer l'origine viscoélastique du sillage négatif et de prédire ses caractéristiques.
Bonometti, Thomas. "Développement d’une méthode de simulation d’écoulements à bulles et à gouttes". Phd thesis, 2005. http://oatao.univ-toulouse.fr/7282/1/bonometti.pdf.
Texto completo da fonte