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Ravelet, Florent. "Etude expérimentale d'écoulements internes turbulents monophasiques et multiphasiques". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00915643.
Pełny tekst źródłaCattieuw, Philippe. "Etude expérimentale des écoulements gaz-particules dans un lit fluidisé circulant". Aix-Marseille 1, 1992. http://www.theses.fr/1992AIX11037.
Pełny tekst źródłaMycek, Paul. "Étude numérique et expérimentale du comportement d'hydroliennes". Phd thesis, Université du Havre, 2013. http://tel.archives-ouvertes.fr/tel-00925229.
Pełny tekst źródłaGoharzadeh, Afshin. "Étude expérimentale des écoulements spiralés dans le système de Couette-Taylor". Le Havre, 2001. http://www.theses.fr/2001LEHA0005.
Pełny tekst źródłaCarrat, Jean-Bastien. "Quantification expérimentale et numérique de l'agressivité de cavitation". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI044/document.
Pełny tekst źródłaCavitation is a major issue in hydraulic machinery, due to its negative consequences: performance drop, vibrations increase and damage.This PhD is dedicated to cavitation erosion and aims to propose tools in order to quantify the erosive potential of a cavitating flow.Experiments were carried out on a symmetrical hydrofoil based on a NACA0015 with a flat area between 27% and 70% of the chord length for an easy instrumentation with pressure sensors.The study is focused on partial cavitation that detaches from the leading edge of the hydrofoil and periodically sheds vapor clouds.All experiments are conducted in the LEGI cavitation tunnel, partly renovated for the new purposes of this PhD.Meanwhile, numerical calculations are performed with the in-house 2D cavitating unsteady code IZ developed at LEGI.Flow analyses are based on high-speed videos and numerical simulations.These analyses give the cavity dynamics, the maximum cavity length and the shedding frequency.The influence of the hydrodynamic parameters (flow velocity, hydrofoil angle of attack, cavitation number) on the cavity behavior is studied.Strong 3D effects observed experimentally make it difficult to predict the cavity dynamics with the two-dimensional code. Nevertheless the maximum cavity length and the shedding frequency are well predicted numerically.A matrix of eight sensors, with an active area of 2x2~mm$^2$, was made and flush mounted on the hydrofoil between 30% and 67% of the chord length.These sensors allow measuring pressure peaks due to the collapse of vapor structures on the hydrofoil surface. Acquisitions are made simultaneously on the eight sensors at a sampling rate of 10 MHz.The flow aggressiveness is estimated experimentally from the peak frequency distribution as a function of the peak amplitude.Numerically an aggressiveness parameter is defined from a model developed previously at LEGI. This parameter allows estimating an instantaneous and mean aggressiveness at the surface of the hydrofoil.The origins of the most aggressive areas are identified from local studies.Comparison between experimental and numerical results shows that the numerical approach overestimates the aggressiveness close to the hydrofoil leading edge.Globally, the experimental and numerical results are in pretty good agreement for low incidence.The most aggressive area is localized at the cavity closure and the flow velocity has a huge influence on the aggressiveness level
Jarre, Sandrine. "Etude expérimentale des instabilités sur disque tournant". Aix-Marseille 2, 1993. http://www.theses.fr/1993AIX22066.
Pełny tekst źródłaLalonde, Pierre. "Etude expérimentale d'écoulements gazeux dans les microsystèmes à fluides". Toulouse, INSA, 2001. http://www.theses.fr/2001ISAT0036.
Pełny tekst źródłaThis work deals with the realisation of an experimental set-up specific to the measurement of very small gaseous flows, and an experimental analysis of gaseous flows in microducts. When the gas becomes rarefied, flowrates are underestimated by the classical theory using the Navier-stokes equations with no-slip velocity boundary conditions at the walls. Our aim is to compare experimental results relative to flows through microducts of circular and rectangular cross sections with theoretical results from slip-flow models. The study is introduced by a bibliographic analysis where some fluidic microsystems are presented, as well as different slip-flow models in terms of boundary conditions adopted by different authors, and a non exhaustive review of very small gaseous flowrate measurement techniques. The experimental set-up is then described. It can measure flowrates from 10-7 m3s-1 to 5. 10-13 m3s-1, with upstream and downstream pressures from 2. 104 Pa to 4. 105 Pa, and temperatures between 10 ʿC and 40 ʿC. The microducts have been tested with air, nitrogen or helium flows. The experimental results are compared with no-slip models and slip-flow models containing slip velocity boundary conditions developed to the first order (Maxwell development) and to the second order (Deissler development). The first order accurately predicts the measured flowrates only for outlet Knudsen numbers smaller than 0. 05. The second order model accurately predicts the measured flowrates for outlet Knudsen numbers smaller than 0. 2. The tests realised during this thesis allow a database of experimental results to be started. These show that several questions remain unanswered, the solution to which may be obtained by carrying out complementary tests to show the influence of the nature of the gas, the temperature, the conditions of the material surface or even the aspect ratio of the channels
Rivoalen, Elie. "Étude numérique et expérimentale de tourbillons de sillage proches d'une surface libre". Le Havre, 1994. http://www.theses.fr/1994LEHA0007.
Pełny tekst źródłaLanglet, André. "Écoulement stationnaire en conduite collabable : étude théorique et expérimentale d'un limiteur de débit". Paris 12, 1992. http://www.theses.fr/1992PA120044.
Pełny tekst źródłaBougouin, Alexis. "Etude expérimentale de l'effondrement d'une colonne fluide-grains". Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0113/document.
Pełny tekst źródłaOn the Earth's surface, granular medias are ubiquitous and they are rarely dissociated from a liquid or a gas. The fluid-solid interaction leads to a complex flow dynamics of these coupled systems. This experimental work aims at characterizing the dynamics of the unsteady gravitydrivencollapse of a granular-fluid column within different configurations of the diphasic mixture. First, the flow dynamics of a neutrally buoyant suspension in air are characterized based on a macroscopic description of the flow. In particular, the rheological parameters of the apparent fluid have been extracted using the temporal evolution of the propagating front and self-similar solutions, models of the propagating dynamics at long times. In the considered range of the Reynolds number, the flow dynamics are described as an apparent Newtonian or non-Newtonian (shear-thinning/-thickening, viscoplastic) fluid depending on the various parameters (volume fraction, viscosity of the interstitial fluid, particle diameter, mixing protocol). In order to describe the opposite case of a sedimentary environment where particle-particle interaction becomes dominant, a second part of this work investigates the case of a fluid-saturated granular collapse, i.e. for which particles are heavier than the carrier fluid, in a dense packing configuration. For this purpose, a first part of the study is dedicated to characterize the collapse of an immersed granular column. The dissipative role of the fluid on the granular media is highlighted by an analysis of the collapse dynamics and the characteristics of the final deposit. This characterization allows to classify the regimes of the collapse depending on the viscosity and the density of the surrounding fluid, i.e. the Stokes number and the fluid-grain density ratio. In the triphasic case, i.e. when the granular-fluid column collapses in air, the dynamics may be strongly affected by capillary effects through the Bond number which controls the initial dynamics of the column. When these effects can be neglected (large Bond number) at the column and grain scales, the interstitial fluid can have a driven or a dissipative role on the granular media leading to a runout length more or less extended in comparison to the dry case. The role of the interstitial fluid depends mainly on its viscosity which also modifies the collapse dynamics. Finally, a preliminary study is realized on the flow dynamics of an initially homogeneous negative buoyant suspension column. This case, which makes the transition between the above mentioned configurations, allows to study the coupling between the settling dynamics of particles and this of the current. In particular, we observe that the settling velocity decreases with the increase of the initial volume fraction of particles
Le, Huu Nho Emmanuel. "Etude expérimentale de l'écoulement autour d'une marche descendante en dérapage". Aix-Marseille 2, 1994. http://www.theses.fr/1994AIX22072.
Pełny tekst źródłaHaji, Sotoudeh Mohammad. "Étude expérimentale et modélisation du couplage hydromécanique de joints rocheux". Lille 1, 1995. http://www.theses.fr/1995LIL10198.
Pełny tekst źródłaHabli, Sabra. "Etude numérique et expérimentale de jets libre ou impactant une plaque plane chauffée". Aix-Marseille 2, 2002. http://www.theses.fr/2002AIX22086.
Pełny tekst źródłaNobili, Clément. "Etude expérimentale de l'instabilité de précession dans un sphéroïde". Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0273.
Pełny tekst źródłaThe nature of the flow in the liquid core of the Earth and other telluric planets is a matter of interest for geophysicists since centuries. It plays an important role in the exchanges between the core and the mantle and is also the source of the magnetic field. The precession of the Earth, studied since Hipparque around the 2nd century B.C. is able to drive complex flows in the outer core. Experimental measurements are conducted in the model case of a precessing spheroid. The flow is visualised with flat reflective particles, which allow a study over a broad range of parameters. The flow is then accurately characterised with PIV measurement. Two solutions of solid body rotation well predicted by Busse theorie (1968) show two transitions to turbulence when the Ekman number decreases. Both transitions show instabilities where inertial modes are coupled by a triadic resonance. The first instability is similar to the one described in a precessing sphere and called Conical Shear Instability (CSI) by Lin et al. (2015). The second instability presents the characteristics of the CSI with inertial modes of low azimuthal wave number but also the characteristics of the elliptic instability (Lacaze 2004). Finally, a third region of instability is observed and measured in the case of prograde precession around a characteristic precession frequency
Roches, Pascal. "Étude expérimentale d'un écoulement turbulent non-cisaillé soumis à un gradient thermique". Toulouse, INPT, 2000. http://www.theses.fr/2000INPT050H.
Pełny tekst źródłaBoussafeur, Kaci. "Étude expérimentale de l'écoulement turbulent pariétal produit par l'impact d'un jet frappant normalement un disque coaxial en rotation". Lille 1, 1989. http://www.theses.fr/1989LIL10011.
Pełny tekst źródłaPous, Frédéric. "Etude expérimentale et théorique de l'interaction aérodynamique entre un tourbillon d'extrémité d'aile et une surface portante en oscillation". Aix-Marseille 2, 1989. http://www.theses.fr/1989AIX22031.
Pełny tekst źródłaCaussanel-Laurent, Odile. "Agitation industrielle de fluides visqueux newtoniens et pseudoplastiques : approches expérimentale et numérique". Toulouse, INPT, 1990. http://www.theses.fr/1990INPT008G.
Pełny tekst źródłaAhd, Mohamed. "Etude expérimentale du développement du sillage d'un cylindre circulaire placé en amont d'un corps d'arrêt". Poitiers, 1994. http://www.theses.fr/1994POIT2294.
Pełny tekst źródłaCassar, Cyril. "Etude expérimentale des écoulements granulaires immergés". Phd thesis, Université de Provence - Aix-Marseille I, 2005. http://tel.archives-ouvertes.fr/tel-00012103.
Pełny tekst źródłalaboratoire des avalanches sous-marines. L'étude expérimentale porte sur un
écoulement granulaire stationnaire et uniforme, complètement immergé dans
de l'eau. Les mesures de vitesse et d'épaisseur montrent que la définition
d'un nombre sans dimension dépendant d'un rapport de deux temps caractéristiques permet de comprendre quantitativement de tels écoulements.
L'adaptation de ce nombre sans dimension à un écoulement sec ou immergé
permet de définir de manière universelle une rhéologie de friction. Intégrée
aux équations moyennées dans l'épaisseur, cette rhéologie permet de définir
un critère de stabilité entre les écoulements stationnaires et des écoulements
instables, en accord qualitatif avec les observations expérimentales. Pour
mieux comprendre le rôle du fluide interstitiel, nous avons étudié numériquement
la trajectoire d'un bloc poreux en écoulement le long d'une pente rugueuse.
Outre la dissipation visqueuse, la présence du fluide peut apporter une lubrification modifiant les trajectoires du bloc poreux, et les angles
d'écoulements stationnaires. La dernière partie du manuscrit présente des
perspectives sur les écoulements immergés instationnaires ainsi qu'un ensemble
de conclusions.
Desevaux, Philippe. "Contribution à l'étude expérimentale d'un éjecteur à flux induit". Besançon, 1994. http://www.theses.fr/1994BESA2072.
Pełny tekst źródłaThis work is concerned with the experimental investigation of an induced air ejector. The bibliographic review reveals that the global analysis of the working of ejectors has been widely privileged to the detriment of the local investigation of the flow. Therefore, after a brief study of the working of the ejector, with the aim to evaluate its performance and to verify the establishment of a mixed flow pattern (supersonic-subsonic) under our experimental conditions, we concentrate our attention on the local investigation of the flow. This experimental investigation is carried out by static pressure measurements and flow visualizations. With regard to the pressure measurement, a sliding measuring system for the centreline static pressure is developed for determining continuously the pressure distribution along the centreline of the ejector. Concerning the optical investigation of flow, several flow visualization methods using laser sheet illumination techniques, are developed in order to visualize the primary pseudo-shock system, the turbulent structures of the flow and the non mixing region. The main results obtained by the different experimentations allow the study of the influence of various operating conditions on the recompression and mixing processes in the ejector. In particular, it appears that the recompression is more difficult to achieve at high values of the entrainment ratio, and that the mixing of the two fluids is completely accomplished as soon as the primary pseudo-shock structure is vanished. Issues related to the mixing tube design are also addressed by this experimental investigation. Static pressure measurements and flow visualizations at the primary nozzle exit also permit the detection of the appearance of the mixed flow pattern with separation. Finally, we present a brief confrontation of our experimental results with results given by various numerical simulations
De, Souza Fenella. "Etude expérimentale de l'interaction sillage/paroi dans une couche limite turbulente manipulée par un cylindre circulaire". Poitiers, 1996. http://www.theses.fr/1996POIT2388.
Pełny tekst źródłaNdongo, Fokoua Georges. "Étude expérimentale de la réduction de traînée par injection de bulles". Phd thesis, Université de Bretagne occidentale - Brest, 2013. http://tel.archives-ouvertes.fr/tel-00931382.
Pełny tekst źródłaKurtulus, Dilek Funda. "Etude numérique et expérimentale de la sustentation par vol vibré : application aux micro-drônes". Poitiers, 2005. http://www.theses.fr/2005POIT2281.
Pełny tekst źródłaThe aerodynamics phenomena of flapping motion in hover are considered in view of the future Micro Air Vehicle applications. The aim of this work is to characterize the vortex dynamics generated by the wing in motion using direct numerical simulation and experimental analysis then to propose a simplified analytical model for prediction of the forces in order to optimize the parameters of the motion leading to maximum force. A great number of cases are investigated corresponding to different angles of attack, location of start of change of incidence, location of start of change of velocity, axis of rotation, and Re number. The airfoil used is symmetrical. The flow is assumed to be incompressible and laminar with the Reynolds numbers between 500 and 2000. The experimental results obtained by the laser sheet visualization and the Particle Image Velocimetry (PIV) techniques are used in parallel with the direct numerical simulation results for the phenomenological analysis of the flow. The model developed for the aerodynamic forces is an indicial method based on the use of the Duhamel Integral and the results obtained by this model are compared with the ones of the numerical simulations
Rehimi, Férid. "Caractérisation expérimentale des structures tourbillonnaires derrière un cylindre en milieu confiné par la PIV et la polarographie". Nantes, 2006. http://www.theses.fr/2006NANT2023.
Pełny tekst źródłaThis work deals with the experimental characterization of the vortex shedding from a circular cylinder between parallel walls. Two experimental measurement techniques were used for the investigation of the wake downstream the cylinder : the PIV (Images Particles Velocimetry) and the polarographic method, with circular probes mounted flush on one of the two parallel walls of the channel downstream from the obstacle. In parallel to this work, one developed a computational code for the inversion of the convection-diffusion equation, which is based on the sequential Beck algorithm, in order to determine the wall shear stress from the limiting current delivered by the probes. Its validation was carried out beforehand by measurements in a cone-plate rheometer. Thereafter, one studied the vortex shedding behind the circular cylinder by synchronized measurements between PIV and polarography. Measurements of PIV were used to characterize the various flow regimes, and to show the main differences between this case of the confined wake (for a blockage ratio of 1/3) and the case of the non-confined wake. Then, one studied the dynamic of vortex structures downstream the cylinder. The decomposition of the instantaneous velocity fields obtained by PIV in Proper Orthogonal Modes (POD) made it possible to follow their energetic distribution for the studied range of Reynolds numbers ( 50 ≤ Re ≤ 300 ). With this decomposition, it is possible to make an inhomogeneous filtering and to reconstitute filtered fields solved in time. Finally, a comparison between the results of PIV and of electrochemistry was carried out
Berenger, Thierry. "Contribution à l'étude expérimentale et numérique du sillage tourbillonnaire d'un rotor d'hélicoptère en vol d'avancement". Aix-Marseille 2, 1994. http://www.theses.fr/1994AIX22092.
Pełny tekst źródłaMokrani, Omar. "Étude expérimentale des écoulements et des tranferts thermiques dans les microcanaux". Nantes, 2005. http://www.theses.fr/2005NANT2076.
Pełny tekst źródłaThis work presents an experimental study of fluid flow and convective heat transfer in straight microchannels. The latter has a rectangular cross-section presenting a high aspect ratio width over height. The present study was devoted initially to the design and the construction of an experimental device allowing the characterization of the flow and the convective heat transfer in the best conditions. This device makes it possible to vary the hydraulic diameter of the microchannels while keeping the other parameters unchanged. The friction coefficients characterizing the flow were estimated thanks to the measurements of pressure drop carried out directly inside the microchannels in a zone where the flow is hydrodynamically developed. The wall thermal conditions inside the microchannel being inaccessible to direct measurement, their estimate requires the use of an inverse method. The latter was elaborated by using the Gauss-Newton minimization algorithm. The thermal and the hydrodynamic results obtained by varying the hydraulic diameter of the microchannels between 1mm and 100µm did not reveal any deviation from the theory or the empirical correlations for large scale channels. These results allow us to confirm that the laws of continuum mechanics for convection and fluid mechanics remain valid in the microchannels having a hydraulic diameter higher or equal to 100µm. This value of course represents the limiting value of our study and probably not that of validity of the laws of continuum mechanics
Robbe-Saule, Manon. "Modélisation expérimentale de génération de tsunami par effondrement granulaire". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS497/document.
Pełny tekst źródłaVarious past geological events have shown that landslides near coastlines, involving volumes from a few thousand cubic meters to several cubic kilometers, can lead to tsunami waves with significant amplitude. The generated wave and the collapse both represent an important hazard for the population and infrastructure located on or near the coast. Realistic modeling requires considering the granular nature of landslides. Here, we developed a new set of small-scale laboratory experiments to investigate in detail the wave generated by the collapse of an aerial granular column into water. An entire set of parameters are tested: (1) the falling granular mass (height, volume, aspect ratio, grain size and density), (2) the water layer height and (3) the geometrical configuration (horizontal or inclined plane). From quasi-bidimensional experiments in a rectangular channel we record both the time evolution of the granular collapse and of the generated wave. We show that the wave generation process is driven by the collective dynamics of the granular collapse at the water free surface. We identify a clear linear dependence between the relative wave amplitude and a Froude number defined as the ratio of the granular front velocity and the solitary wave velocity. The wave amplitude reaches its maximum value at an intermediate water depth. The total energy transfer shows that only a few percent of the initial potential energy of the column is transferred to the wave, suggesting a considerable energy loss in the granular collapse itself. Finally, we highlight the low influence diameter and density of the falling grain in the generation of the wave. This suggests that the mass of the collapse is of low importance compared to its volume. Another interesting result is the linear dependence of the relative wave amplitude with the relative immersed volume of the final deposit. This allows us to estimate the wave amplitude generated by past or potential events in Nature. Despite the various scales and geometries of these natural events, and the uncertainty of the data, our empirical law, from our small-scale experiment, predicts waves similar to other numerical or experimental models
Faure, Thierry. "Méthodes expérimentales instationnaires et leurs applications en mécanique des fluides". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00911074.
Pełny tekst źródłaFerchichi, Yassine. "Etude expérimentale du mouvement d'une particule sphérique à l'approche d'une interface liquide/fluide". Phd thesis, Ecole Centrale Paris, 2013. http://tel.archives-ouvertes.fr/tel-01001954.
Pełny tekst źródłaSartor, F. "Instationnarités dans les interactions choc/couche-limite en régime transsonique : étude expérimentale et analyse de stabilité". Phd thesis, Aix-Marseille Université, 2014. http://tel.archives-ouvertes.fr/tel-01018720.
Pełny tekst źródłaEl, Ouardighi Adel. "Étude numérique et expérimentale de l'écoulement et du transfert de chaleur pour des fluides non-newtoniens thermodépendants en conduites industrielles". Vandoeuvre-les-Nancy, INPL, 1990. http://www.theses.fr/1990INPL059N.
Pełny tekst źródłaHabchi, Charbel. "Étude expérimentale et numérique des phénomènes de mélange turbulent et de transfert thermique en présence de vorticité". Nantes, 2010. http://www.theses.fr/2010NANT2032.
Pełny tekst źródłaThe aim of the present doctoral thesis is the study of turbulent mixing and heat transfer in multifunctional heat exchangers/reactors (MHER) of vortex generator type. The geometry of the MHER strongly influences its energeticefficiency by controlling the flow structure. Thus, understanding of the mechanisms of turbulent mixing and convective heat transfer is a key issue for improving the energetic efficiency of these devices. This work is composed of two main parts: First, we investigate the chemical probe methods, based on a system of parallel-competitive chemical reactions, which are then used to characterize the micromixing in continuous flows. Here, we propose an adaptive experimental procedure to adapt the kinetics of the chemical reactions to the local turbulence. In addition, based on physical modeling of the interaction between the different turbulent mixing scales, we define a domain of validity for this method depending on the hydrodynamic conditions at the probe measurement point. The second part is devoted to the study of the turbulent mixing and heat transfer phenomena in three different turbulent flows in the presence of artificially generated vorticity in a straight circular tube. The tools used in this investigation are the laser Doppler anemometry (LDA) and CFD simulation. Several physical approaches are used to characterize the different mechanisms of turbulent mixing and heat transfer aimed at determining the best configuration of vorticity generation
Gupta, Sanjeev. "Étude expérimentale du comportement dynamique et des performances de rideaux d'air en vue de la conception de systèmes de confinement cellulaire". Nantes, 2005. http://www.theses.fr/2005NANT2017.
Pełny tekst źródłaThe work presented in this report sets the basis of future studies aimed at designing air-curtain based technical solutions for the partitioning of tunnel-like geometries including road tunnels. The investigated solutions rely on air curtains formed by the confluence of two parallel plane streams. A modular experimental facility was built to investigate the dynamical behaviour and the effectiveness of mainly two types of double-jet curtains depending on whether the jet blown on the confined area side is fed with air draught from this area or not. The experimental facility allowed simulating the bilateral confining of one cell between two curtains whose opening ratio H/e was set to 10 in this study. From PIV measurements, the dynamical characteristics of various air-curtain arrangements were investigated for Reynolds numbers ranging from 2000 to 14000. The presence of a recirculation feeding circuit mounted on the ceiling does not affect significantly the turbulent kinetic energy distribution but improves the stability of the system. The analysis reveals a critical value of the Reynolds number associated with either an odd or asymptotic behaviour of the arrangements tested. The results of measurements of the concentration decay of a tracer gas injected within the enclosure are in perfect agreement with the findings from the dynamical analysis. They enable us to quantify the effectiveness of the investigated devices and to establish a hierarchy of various technical solutions. The results lead us to advocate the use of double-flux air curtains for multicellular confining. However, recirculating simple jets seem to be more appropriate for unicellular confining. Finally, attention is drawn on the risks associated with a too thorough simplification when modelling real configurations physically or numerically
Mouazé, Dominique. "Etude expérimentale de la couche limite générée par la houle autour d'un cylindre". Caen, 2001. http://www.theses.fr/2001CAEN2018.
Pełny tekst źródłaLeweke, Thomas. "Etude expérimentale et modélisation du sillage d'un tore à bas nombre de Reynolds". Aix-Marseille 1, 1994. http://www.theses.fr/1994AIX11028.
Pełny tekst źródłaJardin, Thierry. "Analyse numérique et expérimentale de la sustentation par vol battu : application aux micro-drones". Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aéronautique, 2009. http://tel.archives-ouvertes.fr/tel-00445266.
Pełny tekst źródłaBottausci, Frédéric. "Etude expérimentale de la dynamique d'un filament de vorticité isolé". Paris 11, 2002. http://www.theses.fr/2002PA112040.
Pełny tekst źródłaA vorticity filament has been extracted from its turbulent background in order to study its behavior. Two different set-ups have been used. The first amplifies the vorticity of a laminar boundary layer flow, whereas the second amplifies the vorticity contained between two corotating disks. In boths cases, the stretching that strongly enhanced the vorticity is localized. A vortex created in this way modelizes a vorticity filament. In the first experiment, the control parameters give access to two configurations : a configuration where the vortex is permanent and a configuration where it explodes into turbulent spots. In the first configuration, the azimuthal velocity field has been characterized according to the stretching. The diameter and the circulation of the vortex have been analyzed as a function of the stretching. These measurements have led to a proposal for a new stretched vortex model that takes into account the location of the stretching. This model solves the radial velocity divergence problem that appears in Burgers' vortex, for example. We have shown that the location of axial velocity in the vortex core plays an important role in energy dissipation. The dissipation term related to the radial gradient of the axial velocity is dominant in the stretching range studied in our experiment. We have shown that the instability developing around the vortex axis is a centrifugal type instability that produces Taylor rolls. In the configuration in which the vortex explodes, the explosion frequency has been characterized. Turbulent spot measurements have been started. The vortex produced between two rotating disks is more intense than in the channel. We have produced phase diagrams and conducted a systematic study of the circulation with regards to stretching, vortex length and disk rotation speed
Aubrun-Sanches, Sandrine. "Étude expérimentale des structures cohérentes dans un écoulement turbulent décollé et comparaison avec une couche de mélange". Toulouse, INPT, 1998. http://www.theses.fr/1998INPT001H.
Pełny tekst źródłaMartin, Sylvie. "Etude expérimentale et théorique d'un convertisseur hydroélastique de puissance". Ecully, Ecole centrale de Lyon, 1994. http://bibli.ec-lyon.fr/exl-doc/TH_T1568_smartin.pdf.
Pełny tekst źródłaEsquiva-Dano, Isabelle. "Etude expérimentale de la stabilisation d'une flamme non-prémélangée". Ecully, Ecole centrale de Lyon, 2001. http://www.theses.fr/2002ECDL0026.
Pełny tekst źródłaThe influence of the aerodynamic behind a bluff-body on the stabilisation process of a non-premixed flame has been studied on a non-confined experimental set-up consisting of two concentric flows (fuel and air), for disk and tulip shape burners. Direct visualisations were performed and quantitative results have been obtained owing to a two-component laser Doppler Anemometer. Mean temperature and concentration fields were also investigated using a fine wire thermocouple and a gas analyser. The analysis of the flame development and structure has emphasised three main stabilisation regimes (development, ring flame, recirculating flame), two transition regimes and an extinction domain. To complete this analysis, a study of the "ring flame" regime has been developed. It pointed out that the ring is supposed to be a triple flame expanding at the interface between two flows : a premixed on composed of fuel, air and combustion products and the external air flow
Razafiarimanana, Marie-Thérèse. "Etude théorique et expérimentale de l'influence de la convection naturelle sur l'écoulement forcé engendré par une sphère en rotation plongée dans un écoulement vertical ascendant d'un liquide newtonien". Perpignan, 1986. http://www.theses.fr/1986PERP0051.
Pełny tekst źródłaZara, Henri. "Système d'acquisition vidéo rapide : application à la mécanique des fluides". Saint-Etienne, 1997. http://www.theses.fr/1997STET4012.
Pełny tekst źródłaMusielak, Marion. "Etude numérique et expérimentale des transferts de Composés Organiques Volatils du sol à l'air ambiant, en passant au travers du béton". Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2012. http://tel.archives-ouvertes.fr/tel-00753550.
Pełny tekst źródłaDolléans, Pascal. "Etude expérimentale d'écoulements de fluides viscoélastiques dans une conduite présentant une distribution périodique de brusques variations de section". Poitiers, 1996. http://www.theses.fr/1996POIT2307.
Pełny tekst źródłaBeaudet, Laurent. "Etude expérimentale et numérique du décrochage dynamique sur une éolienne à axe vertical de forte solidité". Phd thesis, Université de Poitiers, 2014. http://tel.archives-ouvertes.fr/tel-01058929.
Pełny tekst źródłaCai, Wei. "Etude expérimentale des cavités latérales en écoulements à surface libre". Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0062/document.
Pełny tekst źródłaLateral cavities are free-surface dead-zones located on the side of a fluvial or coastal main flow. As the typical velocities are much larger in the main flow than in the cavity, a mixing layer appears at the interface between both regions. This mixing layer is able to transfer between the main flow and the cavity momentum which then sets the fluid in the cavity in motion and also passive scalar, such as a pollution coming from upstream. The objective of this work was then to investigate the characteristics of the mixing layer, which specificity comes from the fact that it is constrained between the upstream and downstream geometrical corners. It was possible to observe the origin and alternation of the transversal fluid motions: from the cavity towards the main flow and conversely. Regarding the motion in the cavity, the choice was made to keep a constant main flow and to measure the 2D horizontal velocity field using PIV as the extension of the cavity increases. The flow pattern then passes from a 2-cell patterns aligned in the direction of the main flow to a single-cell pattern, then a 2-cells patterns aligned along the direction perpendicular to the main flow and finally a complex 3D pattern for the widest cavity. Then a modification of the experimental set-up permitted to investigate the passive scalar exchanges from the main stream towards the cavity. It was possible to understand the processes responsible for such transfer and to quantify the transfer capacity. The analysis dimensional revealed that in the present subcritical, smooth simplified geometry cavity, the three parameters possible responsible for the modification of the transfer capacity are the geometrical aspect ratio of the cavity, the Reynolds number of the main flow and finally the normalized water depth. It was then shown that the impact of the cavity geometry remains negligible but that the Reynolds number and the normalized water do impact this passive scalar transfer capacity
Gonidec, Patrick. "Contribution expérimentale et numérique à l'étude de l'aérodynamique des corps fuselés en incidence". Toulouse, ENSAE, 1992. http://www.theses.fr/1992ESAE0003.
Pełny tekst źródłaCreppy, Adama Kpatagnon. "Analyse expérimentale de la dynamique de nage des spermatozoïdes". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14477/1/creppy.pdf.
Pełny tekst źródłaTingaud, Florian. "Etude expérimentale de l'amélioration de la distribution diphasique dans un échangeur thermique à l'aide d'ultrasons". Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENI096/document.
Pełny tekst źródłaConcerns about energy consumption including thermal losses cause a need in greater optimization of the processes. The goal of the maximum efficiency in heat exchangers is even stronger when they do not work at nominal conditions. The study presented in this paper focuses on the two-phase flow distribution problematic. The aim of this work was to demonstrate the feasibility of a device that can improve the distribution of the two phases in a mini-channel heat exchanger. The method chosen was the introduction of ultrasound through generators placed in the distributor where they can produce an ultrasonic fountain. This technology has the advantage of being easily adjustable by changing the input voltage of the devices. This therefore allows the device to adapt to different operating conditions. Experimental tests have been done under different conditions, in particular by changing the flow rate of each phase. The mass flow density was varied from 60 kg.m-2.s-1 to 450 kg.m-2.s-1 and the mass quality of less than 1% to over 23% at the tests section inlet. Comparisons between different tests were made by measuring flow rates of each phase at the outlet of the channels. The introduction of ultrasound was also studied by varying the placement and number of the generators of ultrasound. This technology has been shown as viable two-phase distribution enhancement in a majority of cases tested. Interesting phenomena were even observed, which allows, for a future study, different but complementary approaches