Dissertationen zum Thema „Écoulement diphasique gaz-liquide“
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Suleman, Shittu Omeiza. „Contribution à l'étude d'un écoulement gaz-liquide dans un élargissement brusque“. Vandoeuvre-les-Nancy, INPL, 1990. http://docnum.univ-lorraine.fr/public/INPL_T_1990_SULEMAN_S_O.pdf.
Der volle Inhalt der QuelleFarnaud, Jean-Paul. „Mesure par ultrasons dans un milieu diphasique liquide-gaz“. Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37604962c.
Der volle Inhalt der QuelleTalvy, Samuel. „Airlift et colonne à bulles en écoulement gaz-liquide et gaz-liquide-solide“. Toulouse, INSA, 2003. http://www.theses.fr/2003ISAT0031.
Der volle Inhalt der QuelleThis thesis is in the axe of "hydrodynamic physics and physico-chemical of the multiphase devices of the laboratoire d'ingenieries des procedes et de l' environnement. The prime objective is to extend the existing work of computational fluid dynamics (cfd) by analysing the hydrodynamics and mixing in gas-liquid and gas-liquide-solid flows in airlift then to test the potentialites of cfd modelling to simulate bubble columns. The second objective is to propose simpler models to calculate the airlifts and bubble olumns : 1d model. The results obtained with cfd will provide closure relations for the problems of the 1d model. The results of the numerical simulation and 1d are systematicly compared to the experimental results
Salim, Abdelkader. „Ecoulements diphasiques liquide-gaz et liquide-liquide dans les microcanaux : Apport de l'analyse d'image“. Nancy 1, 2006. http://www.theses.fr/2006NAN10006.
Der volle Inhalt der QuelleThis study is divided in two parts: the first one presents a new technique to quantify contact angle and then the wettability. This technique uses a confocal laser scanning microscope (CSLM) and allows to record series of 2-D images of a fluorescent liquid droplets set on various solids surfaces. The building of 3-D images is done with the summation of several images acquired with a regular step along the CSLM z-axis. The results obtained are similar to those obtained with a conventional goniometric technique for different air-liquid-solid systems. The CSLM images shows that drops are characterized by complex morphologies and that the local contact angles can be modified by chemical heterogeneities in the fluids. The second part is mainly an experimental study which deals with liquid-gas and liquid-liquid flows in horizontal microchannels. For each system, the pressures drops are measured and the flow regime maps are realised and compared with those presented in the literature. In the case of liquid-gas flows, the fluid properties have a great impact on the pressure drops and flow patterns. For liquid-liquid flows, two types of experiments are studied: microchannels initially saturated with oil and microchannels initially saturated with water. In the range of the Reynolds numbers considered, a difference in the pressure drops and the flow patterns are observed. The experimental results are interpreted with the homogeneous model and the Lockhart-Martinelli approach
Barbier, Dominique. „Etude d'un écoulement gaz-liquide dans un tube enroulé en hélice“. Vandoeuvre-les-Nancy, INPL, 1990. http://docnum.univ-lorraine.fr/prive/INPL_T_1990_BARBIER_D.pdf.
Der volle Inhalt der QuelleMonoté, Guy. „Atomisation d'un jet liquide par un jet de gaz coaxial : analyse du mélange“. Poitiers, 1994. http://www.theses.fr/1994POIT2286.
Der volle Inhalt der QuelleGradeck, Michel. „Structure de l'écoulement diphasique gaz-liquide dans les échangeurs à plaques corruguées“. Nancy 1, 1996. http://www.theses.fr/1996NAN10302.
Der volle Inhalt der QuelleThis study has been supported by the LEMTA and the associate lahoratories CEA-CENG GRETh in a national rescarch program on plate beat exchangers. Both the thermohydraulic and the hydrodynamic proper to the flow of newtonian or complex fluids arc now well known and the design of such exchangcrs does not set any difficult problem anymore. Although this kind of ex changer is widely used in two-phase systems, all the published works on this topic only involves plate fin exchangers. The main objectives or this work are firstly to establish a flow pattern map, secondly lo explain the friction mechanism (transfer mechanism) when the gas flux increases and when transition between two patterns occurs. The measurement of the local wall shear stress is made by electrochemical method call polarography and those of the local void fraction by an optical probe. The horizontal co-current gas-liquid flow has been first investigated using two kind of geometry (a bidimensionnal and a tridimensionnal) then the vertical upward one
Lusseyran, François. „Caractéristiques cellulaires du régime à poches en écoulement gaz-liquide co-courant vertical, transition vers le régime déstructuré“. Vandoeuvre-les-Nancy, INPL, 1990. http://docnum.univ-lorraine.fr/public/INPL_T_1990_LUSSEYRAN_F.pdf.
Der volle Inhalt der QuelleGuillard, Jean-Christophe. „Étude expérimentale de l'atomisation assistée de jets diphasiques gaz-liquide“. Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI037/document.
Der volle Inhalt der QuelleAssisted atomization of a liquid phase slow by a rapid gas co-current is a topic widely studied in the literature, and significant advances have occurred especially on the breakup mechanisms, the structure of the atomized jet as well as the characteristics of formed drops. However, few studies deal with a configuration where the slow phase consists of a two-phase liquid-gas jet. This situation occurs for example during the transitional ignition of cryogenic rocket engines during which the volumic gas fraction decreases continuously from 1 (purely gas) to 0 (purely liquid), so that almost all two-phases flow regimes, from bubbly flow to annular flow can be observed.The goal is to understand how the volumic gas fraction and/or two-phase flow regime of internal jet impact the atomization modes and the characteristics of the spray.To answer these questions, experiments were conducted with as fluid of substitution air and water under ambient conditions and under gravity. The three main control parameters are the superficial velocity of the liquid which was varied from 0.17 m/s to 2 m/s, the superficial gas velocity in the internal jet that has been set so that the gas flow rate fraction sweeps the range 0 to 0.99 and finally the external gas velocity that has evolved between 20 to 200 m/s. Three geometries of axisymmetric injectors were used to firstly access any desired phase flow regimes except mist flow, and also to vary the diameter of the central jet by a factor of about two. Two types of experimental campaigns were carried out: a campaign where the gas-liquid dynamic pressure ratio was set at 16 for varied gas flow rate fraction, as well as campaigns with fixed gas flow rate fraction and variable M.The structural characteristics of the spray, its breakup length and the angle of spray were measured by high speed imaging while the characteristics of the dispersed phase, that is to say, sizes, velocities and flows of the drops were measured by optical probe.Mapping of flow regimes in the injector and two-phase jet structures with and without assistance by external gas that we have established have shown that these structures were closely related to the flow regime of the central jet. Three main atomization modes were identified and its borders established. For small gas flow rate fraction, the atomization of liquid jets laden bubbles is subject to surface peeling and large-scale lateral beats like a single phase liquid jet. For very large gas flow rate fraction, the annular flow results in the atomization of an annular liquid sheet. For intermediate values, new structures type of umbrella form at the arrival of gas slugs characterized by high amplitude and orthogonal development with respect to the jet. Atomization of “churn" flow and annular flow gives rise to intermittent sprays because of passage of "liquid blocks" from the internal flow.The breakup length is reduced by the addition of internal gas and become very small for the high gas flow rate fractions. The behavior of the angle of the spray is different depending on the diameter of the atomized jet and the internal flow regime. It may therefore increase or decrease depending on configuration.Centred pdf on mean drop size are not much sensitive to the gas flow rate fraction. However mean drop sizes and volumic fluxes show marked evolution: they can according to the gas flow rate fraction and therefore the atomized jet structure decrease or increase
Riou, Xavier. „Contribution à la modélisation de l'aire interfaciale en écoulement gaz-liquide en conduite“. Toulouse, INPT, 2002. http://www.theses.fr/2002INPT034H.
Der volle Inhalt der QuelleBonnet, Jean-Philippe. „Phénomènes de transport dans les mousses métalliques : approche expérimentale des écoulements monophasiques et liquide-gaz“. Aix-Marseille 1, 2007. http://www.theses.fr/2007AIX11043.
Der volle Inhalt der QuelleTijani, Niass. „Instabilités d'interfaces dans un écoulement gaz-liquide à contre courant“. Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL111N.
Der volle Inhalt der QuelleBenattalah, Samia. „Contribution expérimentale sur les bilans à l'interface « gaz-liquide »“. Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL128N.
Der volle Inhalt der QuelleBelghoula, Miloud Samir. „Étude de l’évolution spatio-temporelle de l’interface liquide-vapeur lors de l’évaporation en convection forcée laminaire d’un film d’eau ruisselant sur une paroi plane“. Perpignan, 2008. http://www.theses.fr/2008PERP0926.
Der volle Inhalt der QuelleThe aim of our doctoral research is to study the instability of the gas-liquid interface when it comes to the phenomenon of a liquid film running off on a tilted plane plate forming an angle of with the horizontal plane. This phenomenon will be analyzed by a digital method for spatio-temporal monitoring entitled PLIC-VOF (Piece Wise Linear Interface Calculation, Volume Of Fluid). Our study in simulation is to observe the possible presence of ripples, according to the Reynolds number of liquid film. The modeling of surface tension forces will be achieved and determined by the CSF (Continuum Surface Force method), the determination of the curvature of the interface by the ALE-like scheme. The resolution of the Navier-Stokes equation is produced by the projection method, the resolution of the system of linear equation is produced by that of Bi-CGStab iterative conjugate gradient. To resolve the heat equation, diffusive and convective flows have been separated. Diffusive flows are estimated by explicit finite differences. It was the method used to restrict the FCT ² Flux Corrected Transport ² flow type to express the convective flow. We carried out several tests to validate our computer code. As for advection, we tried the test of pure translation, rotation solid test, test and test single vortex of the unique whirlpool. It has also tested the resolution of the Navier-Stokes equation by testing of the Poiseuille disphasic disposing and the Rayleigh-Taylor instability. The modeling of surface force tensions is validated through tests of balance and oscillation of a drop. The resolution of the heat equation by evaporation of a drop subjected either to a heat flow or to uniform temperature field was also validated. We came to the following results for ( Re= 24. 41, Fr= , ), ( Re= 72. 506, F r=0. 2588, ), (Re=118. 393, Fr=0. 4226,. ) et ( Re=160. 68, F r=0. 5735, )
Gadoin, Émilie. „Régime intermittent "gaz-liquide" en conduite horizontale : écoulements non établis et transitoires“. Toulouse, INPT, 1993. http://www.theses.fr/1993INPT152H.
Der volle Inhalt der QuelleHebrard, Gilles. „Etude de l'influence du distributeur de gaz sur l'hydrodynamique et le transfert de matière gaz-liquide des colonnes à bulles“. Toulouse, INSA, 1995. http://www.theses.fr/1995ISAT0036.
Der volle Inhalt der QuelleYu, Qinggen. „Etude de l'écoulement gaz-liquide dans un coude à 180° : influence de l'inclinaison du coude et du sens de l'écoulement“. Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10375.
Der volle Inhalt der QuelleFréchou, Didier. „Étude de l'écoulement vertical ascendant à trois fluides en conduite vertical“. Toulouse, INPT, 1986. http://www.theses.fr/1986INPT076H.
Der volle Inhalt der QuelleMagnifotcham, François. „Ecoulements diphasiques gaz-liquide. Dynamique et thermique des réacteurs ouverts en régime stationnaire ou transitoire“. Perpignan, 1994. http://www.theses.fr/1994PERP0174.
Der volle Inhalt der QuelleDuret, Benjamin. „Simulation numérique directe des écoulements liquide-gaz avec évaporation : application à l'atomisation“. Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00971810.
Der volle Inhalt der QuellePorcheron, Emmanuel. „Atomisation d'un jet liquide par un jet de gaz inerte appliquée à la propulsion cryotechnique“. Poitiers, 1998. http://www.theses.fr/1998POIT2300.
Der volle Inhalt der QuelleGrall, Véronique. „Étude expérimentale d'écoulements diphasiques liquide-gaz en mini-canaux et en milieu poreux modèle“. Toulouse, INPT, 2001. http://www.theses.fr/2001INPT033H.
Der volle Inhalt der QuelleOriol, Jean. „Caractérisation d'écoulements gaz-liquide avec et sans changement de phase par détection optique et traçage en vue du diagnostic d'échangeurs de chaleur“. Lyon 1, 2006. http://www.theses.fr/2006LYO10247.
Der volle Inhalt der QuelleThis works presents a diagnostic method based on tracing technique for two-phase flow analysis in the continuation of Albaric's study (2002). Flows are produced in a cylindrical tube for limiting the problematic to the two-phase flows structures. Test section can be placed horizontally or vertically. In this, we designed an original optical sensor for liquid coloured tracer detection. This one is also sensitive to gas-liquid interfaces. This last point permitted to define flow structure and to estimate void fraction by signal analysis. Liquid phase tracing and gas tracing by using 81mKr as radiotracer, also allow calculating void fraction as well as real velocities of phases. In addition, we showed that axial dispersion varies according to flow structures. Tests with evaporation validate our liquid phase tracing method
Colli, Serrano Maria Teresa, und Gabriel Wild. „Hydrodynamique et transfert de chaleur dans un réacteur à lit fixe gaz-liquide-solide“. Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL098N.
Der volle Inhalt der QuelleMareuge, Isabelle. „Dispersion d'un scalaire passif dans un écoulement à bulles“. Lyon 1, 1998. http://www.theses.fr/1998LYO10265.
Der volle Inhalt der QuelleHorgue, Pierre. „Modélisation multi-échelle d'un écoulement gaz-liquide dans un lit fixe de particules“. Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0024/document.
Der volle Inhalt der QuelleWe study in this work the modelling of two-phase cocurrent downflows in fixed bed reactors, a process widely used in industry. Due to the flow complexity, i.e., the presence of different interface configurations and, therefore, different phase interactions, most models have been developed using empirical approaches, with the assumption of a homogeneous flow in the reactor. However, several studies showed that local heterogeneities, geometric and hydrodynamic, such as the liquid distribution, could have a great influence on the flow at the reactor-scale and, therefore, on the reactor performance. Consider the microscopic phenomena in a macroscopic model require the use of multi-scale approaches. However, due to the flow complexity, the upscaling cannot be done directly and requires the development of modelling tools suitable for an intermediate scale. In a first step, the direct numerical method \ Volume-Of-Fluid" (VOF) is validated in the case of a two-phase flow in a capillary tube with the presence of a thin film. Then, this method is used, at a microscopic level to propose and validate closure laws for a pore-network model which will be used to simulate the flow at the intermediate scale. This upscaling approach is first tested in a two-dimensional case,i.e., an array of cylinders between two walls. This configuration allows the set up of an experimental approach, coupled with 2D VOF simulations at the intermediate scale, in order to validate the pore-network approach. The pore-network approach is then extended to a real fixed bed, i.e. in three dimensions, whose geometry is obtained by micro-tomography. Local laws of the pore-network model are redefined using direct numerical simulations at a microscopic scale. Pore-network simulations are then compared, for a homogenous phase distribution, with 1D models typically used for two-phase flow in fixed beds. Finally, an experimental campaign was set up to observe, by imaging scanner, the spreading of a liquid jet on a fixed bed pilot. A qualitative comparison is then performed between experimental observations and pore-network simulations in the specific case of the spreading of a liquid jet
Olmos, Eric. „Étude expérimentale et numérique des écoulements gaz-liquide en colonne à bulles“. Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL045N.
Der volle Inhalt der QuelleSergiani, Bruno. „Étude expérimentale des écoulements diphasiques en fractures verticales : ségrégation de phases et perméabilités relatives“. Toulouse, INPT, 1998. http://www.theses.fr/1998INPT018H.
Der volle Inhalt der QuelleTanguy, Sébastien. „Développement d'une méthode de suivi d'interface. Applications aux écoulements diphasiques“. Rouen, 2004. https://tel.archives-ouvertes.fr/tel-00007613.
Der volle Inhalt der QuelleSpray formation mechanisms study from a liquid-gas flow is a fundamental research subject, which industrial applications are large, especially in combustion and propulsion field. Numerical simulation of such flows appear as an essential complement to experimental and theoretical studies, for comprehension and accurate prediction of such physical processes. In this study we developed a numerical interface tracking technique with a Navier-Stokes solver to study accurately the liquid-gas interface dynamics. We describe Level Set method which has been used to track interface motion, and numerical methods for solving Navier-Stokes equations. Different numerical schemes have been tested to improve the computation accuracy. Ghost Fluid Method enables a robust and accurate treatment of discontinuities across the liquid-gas interface. The codes developed (2D, 3D, parallelisation MPI) are then used to study droplets collisions. Comparisons with experimental results show that simulations are realistic and predictive. Next, feasibility studies are done on more complex configurations. Droplets spray formation from primary atomisation of a liquid jet seems to be especially a promising investigation field for such simulations. Finally, reactive interfaces propagation, as liquid vaporisation and premixed combustion have also been studied using Ghost Fluid Method to impose specific jump conditions
Yue, Jun. „Hydrodynamiques et caractéristiques du transfert de matière dans les contacteurs gaz-liquide à microcanaux“. Chambéry, 2008. http://www.theses.fr/2008CHAMS035.
Der volle Inhalt der QuelleGas-liquid microchannel contactors have drawn much research interest in recent years in view of their potential in many mass transfer operations and gas-liquid reactions. The present work aims at an investigation of hydrodynamics and mass transfer characteristics in this type of contactor in great depth. In the first part, co2-water two-phase flow pattern has been investigated in three microchannels with different hydraulic diameters. Five flow patterns have been observed in these microchannels depending on the flow rates of gas and liquid. The fitting performance of the existing correlations for describing flow pattern transition in microchannels was evidenced to deteriorate as the hydraulic diameter of the microchannel decreased. Based on the experimental data, a correlation has been proposed to predict the transition boundary between Taylor flow and unstable slug flow. The second part deals with pressure drop of both n2-water and co2-water two-phase flows in microchannels. It has been shown that pressure drop correlations based on the traditional homogeneous flow model and separated flow model fail to describe the experimental data. Some new correlations have been developed in order to improve the applicability of such models. In the third part, the influence of the operational conditions on gas-liquid mass transfer has been determined in a rectangular microchannel with hydraulic diameter of 667 micrometer by physical and chemical absorption methods. It has been shown that liquid side volumetric mass transfer coefficient and interfacial area in this microchannel contactor are at least one or two orders of magnitude higher than those achieved in traditional gas-liquid contactors. The fourth part is concerned with air-water Taylor flow and mass transfer in two square microchannels with hydraulic diameters of 400 and 200 micrometers. It was observed that lengths of liquid slugs in these microchannels were short (less than 1. 5 times hydraulic diameter). Consequently, the available models developed for capillaries with diameters on the order of millimeters cannot well represent the experimental results. Some new correlations have thus been developed in order to predict pressure drop as well as liquid side volumetric mass transfer coefficient during Taylor flow through the two microchannels. Finally, experiments on co2 absorption into water have been performed in a contactor in which two constructal distributors were integrated with 16 parallel microchannels having hydraulic diameters of 667 micrometer. The results indicated that a nearly uniform two-phase flow distribution could be realized under the ideal flow pattern of slug-annular flow as a result the same mass transfer efficiency as that achieved in a single microchannel can be maintained which offers a relatively easy method for the scale-up of microchannel contactors to even larger scale
Viguier, Françoise. „Ecoulements diphasiques lors de la vidange d'un réservoir de gaz liquéfiés sous pression. Comparaison Eau - CFC11-CFC113“. Paris, ENMP, 1992. http://tel.archives-ouvertes.fr/tel-00844457.
Der volle Inhalt der QuelleMorel, 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.
Der volle Inhalt der QuelleIndarto, Indarto. „Transition contre-courant co-courant d'un écoulement de gaz et d'un film liquide en conduite verticale“. Vandoeuvre-les-Nancy, INPL, 1991. http://www.theses.fr/1991INPL046N.
Der volle Inhalt der QuelleBoucker, Marc. „Modélisation numérique multidimensionnelle d'écoulements diphasiques liquide-gaz en régimes transitoire et permanent : méthodes et applications“. Cachan, Ecole normale supérieure, 1998. http://www.theses.fr/1998DENS0032.
Der volle Inhalt der QuelleMoulai-Mostefa, Nadji. „Hydrodynamique et physico-chimie des écoulements diphasiques dans les conduits capillaires“. Compiègne, 1988. http://www.theses.fr/1988COMPD123.
Der volle Inhalt der QuelleThe effect of surfactants on the hydrodynamics of large drops or bubbles flowing in capillary tubes filled with water is measured. The experimental apparatus consists of a capillary tube inside which drop is injected. The film thickness around the slug is evaluated from conductivity measurements. The set-up is designed so as to operate either with a constant pressure head, in which case the drop velocity is monitored or with a constant flow rate, in which case the pressure drop is monitored. In the case of an air bubble, surface active molecules adsorb at the interface and are swept away towards the rear of the bubble, where they accumulate and rigidify the interface. A steady state is reached where the rate of alimentation of the rigid part of the interface, by adsorption and convection, is balanced by the rate of desorption from this part of surface. The steady state value of the additional pressure drop increases with bubble length until a constant maximum value is reached for sufficiently long slugs. This indicates the coexistence of a rigid region and a free slip interface on the front part of the bubble. The long and short chain surfactants give qualitatively the same behaviour but with different kinetics. The same phenomena are found for liquid/liquid systems when the drop to suspending medium viscosity ratio is moderate (less than 8). For higher values of the viscosity ratio, the hydrodynamics are essentially governed by the viscous effects
Gabillet, Céline. „Étude expérimentale d'un écoulement turbulent en canal horizontal avec injection pariétale de bulles“. Toulouse, INPT, 1998. http://www.theses.fr/1998INPT036H.
Der volle Inhalt der QuelleHecht, Nicolas. „Simulation aux grandes échelles des écoulements liquide-gaz : application à l'atomisation“. Thesis, Rouen, INSA, 2016. http://www.theses.fr/2016ISAM0026/document.
Der volle Inhalt der QuelleThis thesis is dedicated to improve atomization models for automobile injectors. The aim is to develop and evaluate numerical models to capture the liquid structure while they are being atomized from large scales to small sub grid scales in complex configurations. Initially, a calculation procedure is introduced for the transition to an Eulerian description of a spray into a Lagrangian description. In order not to lose the smallest fluid structures, they will be transformed into Lagrangian particles. During this process, an analysis is been performed with various physical parameters such as mass, momentum, or turbulent kinetic energy. The other part of this work is dedicated to the development of a LES (Large Eddy Simulation) for multiphase flow. The simulation of the spray requires a specific treatment of the interface. Two limiting cases are treated in the literature: • The interface may be captured by the mesh. At these locations, a conventional method of DNS (Direct Numerical Simulation) should be used, like the VOF method (Volume of Fluid). • When creating pleating smaller than the size of the mesh, the mesh can no longer match the interface. Then, the calculation must reproduce results from a LES method that take into account structures and drops smaller than the mesh size. Thus, the main problem is to define the configuration of the interface. The development of this model allows to obtain results in a configuration close to the Diesel injection's, which are then compared to a reference DNS
Lavalle, Gianluca. „Modélisation d'un film liquide cisaillé par un écoulement de gaz par une approche intégrale“. Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0051/document.
Der volle Inhalt der QuelleIn many aerospace applications one can find liquid films sheared by a gas flow. In example, these liquid sheets can develop on aircraft wings, freeze and then destroy the aerodynamics performances. Waves can develop at the liquid-gas interface, and the correct analysis of such instabilities becomes very important to model this physical phenomenon. Indeed, instabilities mdify liquid-gas exchanges, such as mass and heat transfers. The aim of the present work consists in developing a technique to couple the liquid phase to the gas phase in order to reproduce the interactions at the interface. Since the liquid layer is much thinner then the gas, anintegral approach is used for modeling. Finally, two cases of a two-phase flow developing in a strictly confined channel and in a large channel are studied. Results are then compared to other reference methods which are more expensive in terms of computational cost
Kuwahara, Takuya. „Caractérisation des régimes d'écoulement diphasique gaz-liquide par fluide magnétique : appareillage, mesures, traitement du signal et analyse de données“. Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1064.
Der volle Inhalt der QuelleMay, Laurence. „Ecoulements diphasiques lors de la vidange de gaz liquéfiés initialement sous saturés. Validation par l'eau et le CFC11“. Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1996. http://tel.archives-ouvertes.fr/tel-00842921.
Der volle Inhalt der QuelleDubois, Xavier. „Études de l'hydrodynamique et du transfert de matière en film ruisselant : application aux colonnes de garnissage“. Pau, 2004. http://www.theses.fr/2004PAUU3025.
Der volle Inhalt der QuelleWithin the industrial framework of the gas waste processing, in particular H2S, the optimization of the Clauspol type units requires the substitution of random packing by structured packing. Structured packing are of recent use, and it is necessary to acquire a better knowledge of the hydrodynamics and mass transfer on such structures, which are complex because of their geometries. Gas-liquid mass transfer is studied for thin films trickling down a tilted plane surface or corrugated one. Local gas side and liquid side mass transfer coefficient, kG and kL, as well as the specific interfacial area, a, are estimated by means of experiments of reactive absorption of CO2 in a sodium hydroxide solution. The dependence of these mass transfer characteristic parameters is explored versus the geometrical properties of the streaming surfaces and the local hydrodynamic properties characterized by the flow rate and liquid film thickness. The mean film thickness is measured using an ultrasonic probe method and by the analysis of Residence Time Distribution. It is small, thinner than 1. 10-3m for a liquid film trickling over plane surface inclined at 30ʿ. On a corrugated surface, while working for angles stronger, up to 70ʿ, the thickness is larger inducing a reduction of the liquid flow velocity. Thus, the total increase in the kLa product observed while passing from a flow on a plane surface to a flow on a corrugated one, is primarily related to the effects of the corrugated geometry on the specific interfacial area. Moreover, the liquid side mass transfer coefficient kL is not very disturbed in the studied range of Reynolds numbers. It is also not very sensitive to the film geometry
Ben, Rayana Fares. „Contribution à l'étude des instabilités interfaciales liquide-gaz en atomisation assistée et taille de gouttes“. Grenoble INPG, 2007. http://www.theses.fr/2007INPG0048.
Der volle Inhalt der QuelleThe study of assisted atomisation interest many industrial sectors in particular, the engines manufacturing in aeronautics and in aerospace. Lndeed, the optimization of the liquid fuel pulverization by a fast gas jet is one of the key issues which determine the efficiency of these engines. Experimental results shown that, on a large broad range of parameter, the most amplified axial instability is Kelvin-Helmholtz type with a wavelength controlled by the thickness of the gas vorticity layer. The ligaments which develop at the peaks of the axial waves are stretched and broken into drops. The analysis and measurements on the transverse instability shows it is a Rayleigh-Taylor type. The transverse wavelength depends on the physical parameters of the fluids, the thickness of the gas vorticity layer and the number of Weber. The fog of drops has been characterized using an optical probe with conical head. Finally some techniques are proposed for the improvement of assisted atomization
Naciri, Ahmed. „Contribution à l'étude des forces exercées par un liquide sur une bulle de gaz : portance, masse ajoutée et interactions hydrodynamiques“. Ecully, Ecole centrale de Lyon, 1992. http://bibli.ec-lyon.fr/exl-doc/TH_T1574_anaciri.pdf.
Der volle Inhalt der QuelleMarcandelli, Céline. „Hydrodynamique, transfert de chaleur particule-fluide et distribution des phases dans les réacteurs à lit fixe à écoulement à co-courant descendant de gaz et de liquide“. Vandoeuvre-les-Nancy, INPL, 1999. http://www.theses.fr/1999INPL093N.
Der volle Inhalt der QuelleBenkenida, Adlène. „Développement et validation d'une méthode de simulation d'écoulements diphasiques sans reconstruction d'interfaces : application à la dynamique des bulles de Taylor“. Toulouse, INPT, 1999. http://www.theses.fr/1999INPT016H.
Der volle Inhalt der QuelleZhang, Tong. „Hydrodynamique et étude des transferts de matière gaz-liquide avec réaction dans des microcanaux circulaires“. Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00804363.
Der volle Inhalt der QuelleHaroun, Yacine. „Étude du transfert de masse réactif gaz-liquide le long de plans corrugués par simulation numérique avec suivi d'interface“. Toulouse, INPT, 2008. http://ethesis.inp-toulouse.fr/archive/00000700/.
Der volle Inhalt der QuelleThis work is done within the framework of gas treatment and CO2 capture process development. The main objective of the present work is to fill the gap between classical experiments and industrial conditions by the use of Computational Fluid Dynamics (CFD). The physical problem considered corresponds to the liquid film flow down a corrugate surface under gravity in present of a gas phase. The chemical species in the gas phase absorb in the liquid phase and react. Numerical calculations are carried out in order to determine the impact of physical and geometrical properties on reactive mass transfer in industrial operating conditions
Bonometti, Thomas. „Développement d'une méthode de simulation d'écoulements à bulles et à gouttes“. Toulouse, INPT, 2005. https://hal.science/tel-04582704.
Der volle Inhalt der QuelleThis 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
Damon, Olivier. „Étude de l'entraînement de gouttelettes à partir de films ruisselant sur des parois lisses ou de forme complexe“. Nancy 1, 1996. http://www.theses.fr/1996NAN10040.
Der volle Inhalt der QuelleVergel, Hernandez César A. „Les Réacteurs catalytiques à lit fixe avec écoulement de gaz et de liquide : comparaison sur le plan théorique et expérimental de la performance du réacteur dans différents sens d'écoulement“. Vandoeuvre-les-Nancy, INPL, 1993. http://docnum.univ-lorraine.fr/public/INPL_T_1993_VERGEL_HERNANDEZ_C_A.pdf.
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