Relevant bibliographies by topics / Liquid film model

Academic literature on the topic 'Liquid film model'

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Published: 10 March 2023

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Journal articles on the topic "Liquid film model"

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Hurlburt, Evan T., and Ty A. Newell. "Prediction of the Circumferential Film Thickness Distribution in Horizontal Annular Gas-Liquid Flow." Journal of Fluids Engineering 122, no. 2 (February 16, 2000): 396–402. http://dx.doi.org/10.1115/1.483269.

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This paper develops a liquid film symmetry correlation and a liquid film thickness distribution model for horizontal annular gas-liquid pipe flows. The symmetry correlation builds on the work of Williams et al. (1996) (Droplet Flux Distributions and Entrainment in Horizontal Gas-Liquid Flows,” Int. J. Multiphase Flow, Vol. 22, pp. 1–18). A new correlating parameter is presented. The liquid film thickness model is based on the work of Laurinat et al. (1985) (Film Thickness Distribution for Gas-Liquid Annular Flow in a Horizontal Pipe,” PhysicoChem. Hydrodynam., Vol. 6, pp. 179–195). The circumferential momentum equation is simplified to a balance between the normal Reynolds stress in the film’s circumferential direction and the circumferential component of the weight of the film. A model for the normal Reynolds stress in the circumferential direction is proposed. The symmetry correlation is used to close the model equations. The model is valid for films with disturbance waves, and is shown to be applicable to air-water flows over a range of conditions from low velocity asymmetric to high velocity symmetric annular flows. [S0098-2202(00)02102-7]
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Radke, C. J. "Film and membrane-model thermodynamics of free thin liquid films." Journal of Colloid and Interface Science 449 (July 2015): 462–79. http://dx.doi.org/10.1016/j.jcis.2014.12.079.

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Khrustalev, D., and A. Faghri. "Thick-Film Phenomenon in High-Heat-Flux Evaporation From Cylindrical Pores." Journal of Heat Transfer 119, no. 2 (May 1, 1997): 272–78. http://dx.doi.org/10.1115/1.2824220.

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A physical and mathematical model of the evaporating thick liquid film, attached to the liquid-vapor meniscus in a circular micropore, has been developed. The liquid flow has been coupled with the vapor flow along the liquid-vapor interface. The model includes quasi-one-dimensional compressible steady-state momentum conservation for the vapor and also a simplified description of the microfilm at the end of the thick film. The numerical results, obtained for water, demonstrate that formation of extended thick liquid films in micropores can take place due to high-velocity vapor flow under high rates of vaporization. The model has also predicted that the available capillary pressure significantly changes with the wall-vapor superheat and other operational conditions.
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Rettenmayr, Markus, Oleg Kashin, and Stephanie Lippmann. "Simulation of Liquid Film Migration during Melting." Materials Science Forum 790-791 (May 2014): 127–32. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.127.

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Melting of a single-phase polycrystalline material is known to start by the formation of liquid films at the surface and at grain boundaries. The internal liquid films are not necessarily quiescent, but can migrate to avoid/reduce supersaturation in the solid phase. The migration is discussed in the literature to be governed by coherency strains of the solid/liquid interface, by concentration gradients in the liquid or by concentration gradients in the solid phase. A phase transformation model for diffusional phase transformations considering interface thermodynamics (possible deviations from local deviations) has been put up to describe the migration of the solid/liquid (trailing) and the liquid/solid (leading) interfaces of the liquid film. New experimental results on melting in a temperature gradient in combination with simulation calculations reveal that concentration fluctuations in the liquid phase trigger the liquid film migration and determine the migration direction, until after a short time in the order of microseconds the process is governed by diffusion in the solid phase.
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Isaenkov, Sergey V., Ivan S. Vozhakov, Mikhail V. Cherdantsev, Dmitry G. Arkhipov, and Andrey V. Cherdantsev. "Effect of Liquid Viscosity and Flow Orientation on Initial Waves in Annular Gas–Liquid Flow." Applied Sciences 10, no. 12 (June 25, 2020): 4366. http://dx.doi.org/10.3390/app10124366.

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The complex wave structure of annular gas–liquid flow with disturbance waves and liquid entrainment is a result of the evolution of high-frequency initial waves, appearing at the very inlet of the flow, prior to the hydrodynamic stabilization of liquid film. This stage of flow evolution is studied experimentally, using a shadow technique, and theoretically, using a linear stability analysis of the Orr–Sommerfeld equation in both phases. The present work is focused on the comparison of earlier results obtained in air–water downward flow with the new results obtained in upward flow and with more viscous liquids. The flow orientation affects the shape of the liquid film prior to stabilization; the initial film area is thicker but shorter in upward flow. Upward flow orientation also leads to a lower frequency and the increment of growth of initial waves. The viscosity effect is found to be weak if flow rates of both phases are the same. The model is mostly able to reproduce the qualitative trends, but the quantitative agreement is not reached. Experimental observations indicate that the liquid flow within the initial area is significantly different from the stabilized flow of gas-sheared liquid film, which is used in the model. This difference could explain the discrepancy; further development of the model should be aimed at taking into account the evolution of the velocity profile inside the liquid film during the stage of hydrodynamic stabilization.
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O'Brien, S. B. G., and M. Hayes. "A model for dip-coating of a two liquid mixture." International Journal of Mathematics and Mathematical Sciences 29, no. 6 (2002): 313–24. http://dx.doi.org/10.1155/s0161171202011614.

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We consider a thin film flow where a flat substrate is coated with a mixture of two miscible liquids, of equal viscosity, and develop a model to predict the evolving coating thicknesses. The developed model can, under certain circumstances, be used as an approximation for the dip-coating of a liquid suspension of a viscous volatile liquid and solid solute as occurs in many industrial applications.
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Halpern, D., and J. B. Grotberg. "Surfactant Effects on Fluid-Elastic Instabilities of Liquid-Lined Flexible Tubes: A Model of Airway Closure." Journal of Biomechanical Engineering 115, no. 3 (August 1, 1993): 271–77. http://dx.doi.org/10.1115/1.2895486.

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A theoretical analysis is presented predicting the closure of small airways in the region of the terminal and respiratory bronchioles. The airways are modelled as thin elastic tubes, coated on the inside with a thin viscous liquid lining. This model produces closure by a coupled capillary-elastic instability leading to liquid bridge formation, wall collapse or a combination of both. Nonlinear evolution equations for the film thickness, wall position and surfactant concentration are derived using an extended version of lubrication theory for thin liquid films. The positions of the air-liquid and wall-liquid interfaces and the surfactant concentration are perturbed about uniform states and the stability of these perturbations is examined by solving the governing equations numerically. Solutions show that there is a critical film thickness, dependent on fluid, wall and surfactant properties above which liquid bridges form. The critical film thickness, εc, decreases with increasing mean surface-tension or wall compliance. Surfactant increases εc by as much as 60 percent for physiological conditions, consistent with physiological observations. Airway closure occurs more rapidly with increasing film thickness and wall flexibility. The closure time for a surfactant rich interface can be approximately five times greater than an interface free of surfactant.
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Wittig, S., J. Himmelsbach, B. Noll, H. J. Feld, and W. Samenfink. "Motion and Evaporation of Shear-Driven Liquid Films in Turbulent Gases." Journal of Engineering for Gas Turbines and Power 114, no. 2 (April 1, 1992): 395–400. http://dx.doi.org/10.1115/1.2906604.

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Detailed measurements of wavy liquid films driven by the shear stress of turbulent air flow are obtained for different air temperatures, air velocities, and flow rates of the liquid. The experimental conditions are chosen from characteristic data of liquid film flow in prefilming airblast atomizers and film vaporization employing combustors. For the measurement of the local film thickness and film velocity a new optical instrument—based on the light absorption of the liquid—has been developed, which can be used at high temperatures with evaporation. The measured data of the gas phase and the liquid film are compared with the results of a numerical code using a laminar as well as a turbulent model for the film flow and a standard numerical finite volume code for the gas phase. The results utilizing the two models for the liquid film show that the film exhibits laminar rather than turbulent characteristics under a wide range of flow conditions. This is of considerable interest when heat is transferred across the film by heating or cooling of the wall. With this information the optical instrument can also be used to determine the local shear stress of the gas phase at the phase interface. Using time-averaged values for the thickness, the velocity, and the roughness of the film, the code leads to relatively accurate predictions of the interaction of the liquid film with the gas phase.
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Lapp, Florian Felix, Sebastian Schuster, Simon Hecker, and Dieter Brillert. "Experimental Validation of an Analytical Condensation Model for Application in Steam Turbine Design." International Journal of Turbomachinery, Propulsion and Power 7, no. 1 (March 3, 2022): 9. http://dx.doi.org/10.3390/ijtpp7010009.

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This paper presents experimental data on shear-stress-driven liquid water films on a horizontal plate formed by the condensation of superheated steam. The experimental results were obtained in the Experimental Multi-phase Measurement Application (EMMA) at the University of Duisburg-Essen. The liquid film thickness was spatially and temporally investigated with an optical measurement system. Furthermore, the resulting local heat transfer coefficient in the case of film condensation was determined for a variety of steam velocities and temperatures. Subsequently, the presented data are compared to the results of an analytical condensation model for shear-stress-driven liquid films developed by Cess and Koh. Thus, the model is qualitatively validated, with explicable remaining disparities between the model and experiment that are further discussed. The presented results are an important contribution to the contemporary research into steady-state, single-component multiphase flow considering phase-change phenomena including heat transfer.
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Borodina, Kseniia A. "MODEL OF THE EVOLUTION OF A BINARY HOMOGENEOUS SOLUTION FILM UNDER THERMAL ACTION." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 6, no. 4 (2020): 48–68. http://dx.doi.org/10.21684/2411-7978-2020-6-4-48-68.

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The research on the motion of liquid films has recently become increasingly important, which is associated with the expanding field of their practical application. For example, the promising methods of cooling include the technologies based on the evaporation of a thin layer of liquid. Based on the Marangoni effects, optical elements of medical diagnostics systems can be developed, the performance of which can be quickly reconfigured for the necessary tasks in comparison with the currently used movable lenses. Many authors in Russia and abroad are engaged in a comprehensive theoretical study of film flows, which should not lag behind the studies of the possibilities of their application. At the same time, the motion of films of a binary homogeneous solution has not been studied enough, and this is the object of this study. This paper considers the behavior of a liquid film containing a volatile component when it is heated. The importance of taking into account the Laplace pressure jump at the interface is indicated, as well as the effect of surface curvature on the saturated vapor pressure. Formulation of the problem is formalized in a limited volume. The stability of the numerical scheme was investigated by the harmonics method. The results confirm the reliability of the model by testing it on a number of problems with analytical solutions: preservation of a liquid volume when a film in a gravity field touches a vertical wall; determination of the profile of the liquid layer with uneven heating of the substrate; mass balance at uniform heating and cooling.
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Dissertations / Theses on the topic "Liquid film model"

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Hantsch, Andreas. "A lattice Boltzmann equation model for thermal liquid film flow." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-130098.

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Liquid film flow is an important flow type in many applications of process engineering. For supporting experiments, theoretical and numerical investigations are required. The present state of the art is to model the liquid film flow with Navier--Stokes-based methods, whereas the lattice Boltzmann method is employed here. The final model has been developed within this treatise by means of a two-phase flow and a heat transfer model, and boundary and initial conditions. All these sub-models have been applied to simple test cases. It could be found that the two-phase model is capable of solving flow phenomena with a large density ratio which has been shown impressively in conjunction with wall boundary conditions. The heat transfer model was tested against spectral method results with a transient non-uniform flow field. It was possible to find optimal parameters for computation. The final model has been applied to steady-state film flow, and showed very good agreement to OpenFOAM simulations. Tests with transient film flow demonstrated that the model is also able to predict these flow phenomena
Flüssigkeitsfilmströmungen kommen in vielen verfahrenstechnischen Prozessen zum Einsatz. Zur Unterstützung von Experimenten sind theoretische und numerische Untersuchungen nötig. Stand der Technik ist es, Navier--Stokes-basierte Modelle zu verwenden, wohingegen hier die Lattice-Boltzmann-Methode verwendet wird. Das finale Modell wurde unter Verwendung eines Zweiphasen- und eines Wärmeübertragungsmodell entwickelt und geeignete Rand- und Anfangsbedingungen formuliert. Alle Untermodelle wurden anhand einfacher Testfälle überprüft. Es konnte herausgefunden werden, dass das Zweiphasenmodell Strömungen großer Dichteunterschiede rechnen kann, was eindrucksvoll im Zusammenhang mit Wandrandbedingungen gezeigt wurde. Das Wärmeübertragungsmodell wurde gegen eine Spektrallösung anhand eines transienten und nichtuniformen Strömungsproblemes getestet. Stationäre Filmströmungen zeigten sehr gute Übereinstimmungen mit OpenFOAM-Lösungen und instationäre Berechungen bewiesen, dass das Model auch solche Strömungen abbilden kann
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Hantsch, Andreas [Verfasser], Ulrich [Akademischer Betreuer] Groß, Ulrich [Akademischer Betreuer] Groߟ, and Rüdiger [Akademischer Betreuer] Schwarze. "A lattice Boltzmann equation model for thermal liquid film flow / Andreas Hantsch. Gutachter: Ulrich Groß ; Rüdiger Schwarze. Betreuer: Ulrich Groߟ." Freiberg : Technische Universität Bergakademie Freiberg Universitätsbibliothek "Georgius Agricola", 2013. http://d-nb.info/105809503X/34.

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Hu, Chih-Chieh. "Mechanistic modeling of evaporating thin liquid film instability on a bwr fuel rod with parallel and cross vapor flow." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28148.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Abdel-Khalik, Said; Committee Member: Ammar, Mostafa H.; Committee Member: Ghiaasiaan, S. Mostafa; Committee Member: Hertel, Nolan E.; Committee Member: Liu, Yingjie.
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Хоменко, Олексій Віталійович, Алексей Витальевич Хоменко, Oleksii Vitaliiovych Khomenko, B. N. J. Persson, М. А. Khomenko, and S. V. Rudenko. "Synergetic model of frictional softening of ice surface layer." Thesis, Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна Національної академії наук України, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41630.

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Antariksawan, Anhar Riza. "Interaction thermique acier inoxydable fondu-eau sur l'installation SEIZIES : analyse et interprétation." Grenoble INPG, 1993. http://www.theses.fr/1993INPG0038.

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Le contact entre le jet d'eau et l'acier inoxydable fondu observe dans l'installation experimentale seizies provoque une pressurisation et une liberation de l'energie mecanique. On propose dans ce memoire une analyse et une interpretation de cette interaction a l'aide d'un modele thermodynamique et d'un modele parametrique. Les objectifs de ce travail sont: l'evaluation du terme source de l'interaction, a savoir l'energie reellement transmise dans l'interaction et celle transformee en travail mecanique et l'amelioration des connaissances sur l'interaction thermique metal fondu et notamment dans le cas d'une injection de l'eau sur le metal fondu. Les resultats importants sont: le travail mesure experimentalement est representatif du travail maximum liberable dans seizies, la masse d'acier participant a ete determine et certains mecanismes physiques ont ete valides
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Kurz, Günter. "Hydrodynamics of defects in nematic liquid crystal films." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313591.

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Bribesh, Fathi. "Free surface films of binary liquid mixtures." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9810.

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Model-H is used to describe structures found in the phase separation in films of binary liquid mixture that have a surface that is free to deform and also may energetically prefer one of the components. The film rests on a solid smooth substrate that has no preference for any component. On the one hand the study focuses on static aspects by investigating steady states that are characterised by their concentration and film height profiles. A large variety of such states are systematically analysed by numerically constructing bifurcation diagrams in dependence of a number of control parameters. The numerical method used is based on minimising the free energy functional at given constraints within a finite element method for a variable domain shape. The structure of the bifurcation diagrams is related to the symmetry properties of the individual solutions on the various branches. On the other hand the full time dependent model-H is linearised about selected steady states, in particular, the laterally invariant, i.e.\ layered states. The resulting dispersion relations are discussed and related to the corresponding bifurcation points of the steady states. In general, the results do well agree and confirm each other. The described analysis is performed for a number of important cases whose comparison allows us to gain an advanced understanding of the system behaviour: We distinguish the critical and off-critical case that correspond to zero and non-zero mean concentration, respectively. In the critical case the investigation focuses on (i) flat films without surface bias, (ii) flat films with surface bias, (iii) height-modulated films without surface bias, and (iv) height-modulated films with surface bias. Each case is analysed for several mean film heights and (if applicable) energetic bias at the free surface using the lateral domain size as main control parameter. Linear stability analyses of layered films and symmetry considerations are used to understand the structures of the determined bifurcation diagrams. For off-critical mixtures our study is more restricted. There we consider height-modulated films without and with surface bias for several mean film heights and (if applicable) energetic bias employing the mean concentration as main control parameter.
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Kitavtsev, Georgy. "Derivation, analysis and numerics of reduced ODE models describing coarsening dynamics of liquid droplets." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2010. http://dx.doi.org/10.18452/16069.

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Die vorliegende Arbeit beschaeftigt sich mit der Herleitung, Analyse und Numerik von reduzierten Systemen gewoehnlicher Differenzialgleichungen (bezeichnet als reduzierte Modelle), die einer Familie von eindimensionalen Schmierfilmgleichungen (lubrication equations) entsprechen. Diese Familie wurde von Muench et al. 06'' hergeleitet und beschreibt den Entnetzungsprozess von nanoskopischen duennen Fluessigkeitsfilmen auf hydrophoben Polymersubstraten als Folge von anziehenden van der Waals und abstossenden Born Intermolekularkraeften. Dabei wurden verschiedene Regime von Schlupf-Laengen auf der Grenzflaeche zwischen Fluessigkeit und Polymersubstrat betrachtet. Die letzte Phase des Entnetzungsprozesses ist durch eine sehr langsame Vergroeberungsdynamik der verbleibenden Tropfen charakterisiert. Reduzierte Modelle, hergeleitet aus den zugrunde liegenden Schmierfilmgleichungen, ermoeglichen die effiziente analytische und numerische Untersuchung des Vergroeberungsprozesses. Im ersten Teil dieser Studie leiten wir unter Verwendung von asymptotischen Methoden reduzierte Modelle fuer verschiedene Schmierfilmgleichungen ab. Der zweite Teil dieser Studie widmet sich einer neuen Methode fuer die Herleitung und die Begruendung solcher reduzierter Modelle. Diese Methode basiert auf der Idee der Reduktion auf eine Zentrumsmannigfaltigkeit. Zuerst beschreiben wir eine formale Reduktion auf eine sogenannte "approximative invariante" Mannigfaltigkeit. Danach betrachten wir die Linearisierung der Schmierfilmgleichung um den stationaeren Tropfen. Hier geben wir eine rigorose Herleitung fuer das asymptotische Verhalten des Spektrums bezuglich des kleinen Parameters epsilon. Fuer das entsprechende Eigenwertproblem belegen wir die Existenz von einer von epsilon abhaengigen Luecke im Spektrum, die eine wichtige Eigenschaft fuer die strenge Begruendung unserer formalen Reduktion auf die "approximative invariante" Mannigfaltigkeit ist.
In this dissertation the topic of reduced ODE models corresponding to a family of one-dimensional lubrication equations derived by Muench et al. 06'' is addressed. This family describes the dewetting process of nanoscopic thin liquid films on hydrophobic polymer substrates due to the presence of several intermolecular forces and takes account of different ranges of slip-lengths at the polymer substrate interface. Reduced ODE models derived from underlying lubrication equations allow for an efficient analytical and numerical investigation of the latest stage of the dewetting process: coarsening dynamics of the remaining droplets. We first give an asymptotical derivation of these models and use them to investigate the influence of slip-length on the coarsening dynamics. In the second part of the talk we present a new geometric approach which can be used for an alternative derivation and justification of above reduced ODE models and is based on a center-manifold reduction recently applied by Mielke and Zelik 08'' to a certain class of semilinear parabolic equations. One of the main problems for a rigorous justification of this approach is investigation of the spectrum of a lubrication equation linearized at the stationary solution, which describes physically a single droplet. The corresponding eigenvalue problem turns out to be a singularly perturbed one with respect to a small parameter epsilon tending to zero. For this problem we show existence of an epsilon-dependent spectral gap between a unique exponentially small eigenvalue and the rest of the spectrum.
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Celle, Pierre. "Couplages fluide / milieu poreux en grandes déformations pour la modélisation des procédés d'élaboration par infusion." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2006. http://tel.archives-ouvertes.fr/tel-00741260.

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Dans ce manuscrit, un modèle complet pour la simulation de l'écoulement d'un fluide thermor éactif à travers un milieu poreux fortement compressible est présenté. Ce modèle est utilisé pour l'étude des procédés d'élaboration des matériaux composites par infusion à travers leur épaisseur (Liquid Resin Infusion-LRI et Resin Film Infusion-RFI ). Dans ces procédés, le mélange entre les renforts et la résine liquide est réalisé dans la direction transverse aux plans des préformes pendant la phase de mise en forme. Les coˆuts sont ainsi réduits et les problèmes de remplissage éliminés. Ces procédés sont néanmoins peu maîtrisés et les caractéristiques de la pièce finale difficilement prévisibles (principalement les épaisseurs et les porosités). La mise au point d'un modèle numérique constituerait un bon outil pour développer et finaliser de nouvelles solutions composites. D'un point de vue physique, l'infusion de la résine à travers l'épaisseur des préformes est une conséquence de la pression appliquée sur l'empilement résine/préforme. Dans cette analyse multi-physique deux types de problèmes sont rencontrés. Tout d'abord, on connait mal les conditions de couplage entre les zones liquides, gouvernées par les équations de Stokes, et les préformes imprégnées assimilées à des milieux poreux, gouvernées par une loi de Darcy et une loi de comportement mécanique non-linéaire. Par ailleurs, les interactions entre l'écoulement de la résine et la compression des préformes ne sont pas bien maîtrisées. Le modèle développé inclut donc une condition de Beaver-Joseph- Schaffman modifiée pour le couplage entre les zones de Darcy et de Stokes. Une formulation ALE pour l'écoulement de la résine dans un milieu poreux déformable subissant de fortes déformations est utilisée et couplée à une formulation Lagrangienne Réactualisée pour la partie solide. Ces deux mécanismes physiques sont couplés à des modèles thermo-chimiques pour traiter la réticulation de la résine sous l'action du cycle de température. Dans ce travail, un certain nombre d'outils numériques et de nouvelles formulations ont été développés en vue de simuler les procédés LRI et RFI. Chaque outil est étudié et validé analytiquement ou numériquement avant d'être intégré dans les modèles LRI /RFI. Des simulations numériques d'infusion sont ensuite présentées et commentées, puis une première comparaison avec des essais expérimentaux est proposée.
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Hinsberg, Nils Paul van. "Investigation of drop and spray impingement on a thin liquid layer accounting for the wall film topology." Aachen Shaker, 2009. http://d-nb.info/1000840115/04.

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Books on the topic "Liquid film model"

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Sidney, Roberts A., and Langley Research Center, eds. New devices for flow measurements: Hot film and burial wire sensors, infrared imagery, liquid crystal, and piezo-electric model : final report for the period ended May 15, 1990. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1991.

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C, Ruyer-Quil, Scheid B, Velarde M. G, and SpringerLink (Online service), eds. Falling Liquid Films. London: Springer-Verlag London Limited, 2012.

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Sprengel, Horst. Dynamics of thin liquid oxide films covering a solid fuel. Bielefeld: Fakultät für Physik, Universität Bielefeld, 1993.

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Taylor, William J. Comparing the results of an analytical model of the no-vent fill process with no-vent fill test results for a 4.96 m℗đ (175 ft℗đ) tank. [Washington, DC]: National Aeronautics and Space Administration, 1993.

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1953-, Fujimori A., Tokura Y. 1954-, and Taniguchi International Symposium on the Theory of Condensed Matter (17th : 1994 : Kashikojima, Japan), eds. Spectroscopy of mott insulators and correlated metals: Proceedings of the 17th Taniguchi Symposium, Kashikojima, Japan, October 24-28, 1994. Berlin: Springer, 1995.

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ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. Shanghai Shi: Shanghai da xue chu ban she, 2010.

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Kalliadasis, S., C. Ruyer-Quil, and B. Scheid. Falling Liquid Films. Springer, 2011.

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Kalliadasis, S., C. Ruyer-Quil, B. Scheid, and M. G. Velarde. Falling Liquid Films. Springer, 2013.

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Sikdar, Sudipta. A quasimolecular simulation of liquid droplet collision and thin film dynamics. 1994.

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High Quality Liquid Crystal Displays and Smart Devices: Development, Display Applications and Components. Institution of Engineering & Technology, 2019.

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Book chapters on the topic "Liquid film model"

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Wakai, Fumihiro, and Naoki Kondo. "Solution-Precipitation Creep Model for Superplastic Ceramics with Intergranular Liquid Film." In Plastic Deformation of Ceramics, 269–77. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1441-5_23.

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Potyka, Johanna, Johannes Kromer, Muyuan Liu, Kathrin Schulte, and Dieter Bothe. "Modelling and Numerical Simulation of Binary Droplet Collisions Under Extreme Conditions." In Fluid Mechanics and Its Applications, 127–47. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_7.

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AbstractThe complexity of binary droplet collisions strongly increases in case of immiscible liquids with the occurrence of triple lines or for high energetic collisions, where strong rim instabilities lead to the spattering of satellite droplets. To cope with such cases, the Volume of Fluid method is extended by an efficient interface reconstruction, also applicable to multi-material cells of arbitrary configuration, as well as an enhanced continuous surface stress model for accurate surface force computations, also applicable to thin films. For collisions of fully wetting liquids, excellent agreement to experimental data is achieved in different collision regimes. High-resolution simulations predict droplet collisions in the spattering regime and provide detailed insights into the evolution of the rim instability. Another challenge is the numerical prediction of the collision outcome in the bouncing or coalescence region, where the rarefied gas dynamics in the thin gas film determines the collision result. To this end, an important step forward became possible by modelling the pressure in the gas film. With the introduction of an interior collision plane within the flow domain, it is now possible to simulate droplet collisions with gas film thickness reaching the physically relevant length scale.
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Thiele, Uwe. "Dewetting and decomposing films of simple and complex liquids." In Multiphase Microfluidics: The Diffuse Interface Model, 93–127. Vienna: Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1227-4_3.

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Prokudina, Ludmila A. "Unstable Flow Modes of the Non-isothermal Liquid Film." In Lecture Notes in Computer Science, 576–82. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57099-0_65.

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Karmakar, Avijit, and Sumanta Acharya. "A Review of Computational Models for Falling Liquid Films." In 50 Years of CFD in Engineering Sciences, 551–606. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2670-1_16.

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Shang, De-Yi. "Complete Mathematical Models of Laminar Free Convection Film Boiling of Liquid." In Heat and Mass Transfer, 215–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28983-5_11.

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Honkonen, Scott C., and David J. Chato. "Comparison of Liquid Hydrogen no-Vent Fill Test Data with Analytic Models." In Advances in Cryogenic Engineering, 153–60. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_18.

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Najim, Monssif, M'barek Feddaoui, Abderrahman Nait Alla, and Adil Charef. "Heat and Mass Transfer Characteristics of Evaporating Falling Films." In Process Analysis, Design, and Intensification in Microfluidics and Chemical Engineering, 251–76. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7138-4.ch009.

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This chapter presents a numerical investigation of heat and mass transfer characteristics during the evaporation of liquid films in vertical geometries. A two-phase model is developed to simulate laminar film evaporation into laminar gas flow. The liquid film evaporation is evaluated under adiabatic and heated wall conditions for both pure and binary liquid film. The model is based on a finite difference method to solve the governing equations of the two phases. The obtained results concerns two industrial processes. The first part of the chapter is devoted to the analysis of the thermal protection of vertical channel wall, while the second part is devoted to the desalination process by falling liquid film. The simulations results allowed the determination of the optimal operating conditions for both processes.
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BRAUN, RICHARD J. "AN INSOLUBLE SURFACTANT MODEL FOR A DRAINING VERTICAL LIQUID FILM." In Interfaces for the 21st Century: New Research Directions in Fluid Mechanics and Materials Science, 246. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949609_0028.

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Abiev, Rufat. "Analysis of Hydrodynamics and Mass Transfer of Gas-Liquid and Liquid-Liquid Taylor Flows in Microchannels." In Process Analysis, Design, and Intensification in Microfluidics and Chemical Engineering, 1–49. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7138-4.ch001.

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Analysis of hydrodynamics and mass transfer Taylor flows in micro channels of both gas-liquid and liquid-liquid systems on the basis of classical theoretical approach with some simplifying assumptions was performed. Results of theoretical analysis for description of hydrodynamic parameters and mass transfer characteristics were confirmed by comparison with the author's own and available in literature experimental data. It was shown that the main parameters of two-phase Taylor flows could be quite precisely described theoretically: mean bubble/droplet velocity, liquid film thickness, real gas holdup (which is always smaller than so-called dynamic holdup), pressure drop. Peculiarities of liquid-liquid flows compared to gas-liquid Taylor flows in capillaries are discussed. Wettability effect on hydrodynamics was examined. Tools of mass transfer intensification of gas-liquid and liquid-liquid Taylor flow in micro channels are analyzed. Three-layer model for heat and mass transfer has been proposed and implemented for the case of solid-liquid mass transfer for gas-liquid Taylor flows; optimal process conditions for this process are found theoretically and discussed from physical point of view.
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Conference papers on the topic "Liquid film model"

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Lamarque, Nicolas, Quentin Lamiel, Jérome Hélie, and Dominique Legendre. "Spreading model for wall films generated by high-pressure sprays." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4999.

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This paper presents a new model developed to predict the area of wall films that may develop in gasoline direct injection engines (GDI). In a always more restrictive legislation on gas emissions the injection process in internal combustion (IC) engines has been highlighted as a domain of great concern in order to satisfy these requirements. Many spray wall interactions models exist in literature and are included in different CFD tools. Most often they are based on the sum of single drop-wall impacts. The specificity of the present model lies in its simplicity and the way the film is treated globally. Here its propagation is predicted using a balance between the momentum given by the spray and the viscous shear stress. Jointly with the theoretical model, an experimental set-up has been built up, an optical measurement technique called Refractive Index Matching method is used to follow the development of the wall film.It has been found that the area of the wall film is proportional to the duration of injection, while the distance betweenthe injector and the wall has not shown many influence on the evolution of area. The influence of the injection pressure has also been identified, when the pressure is doubled the radius of the film is multiplied by 3√2. Eventuallyedicts that film thickness decreases as fuel pressure rises.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4999
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Landjobo Pagou, Arnold, and Xiaodong Wu. "Liquid Film Model for Prediction and Identification of Liquid Loading in Vertical Gas Wells." In International Petroleum Technology Conference. International Petroleum Technology Conference, 2020. http://dx.doi.org/10.2523/19855-abstract.

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Ma, Zaiyong, Yue Nina, Suizheng Qiu, Wenxi Tian, and Guanghui Su. "Application of Film Dryout Model in Liquid Metal CHF Prediction." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30214.

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Liquid metals have been used as coolants of several kinds of nuclear reactors, and the prediction of critical heat flux (CHF) is rather important for the design, safety and economy of these reactors. A film dryout model considering the deposition and entrainment of droplets was established to obtain the CHF of liquid metal in annular flow flowing in tubes. The correlations of deposition rate, entrainment rate and so on for conventional fluids were used, and the initial entrainment fraction was determined according to experimental data. Results showed that the correlations for conventional fluids could be used for liquid metals approximately, but relatively large error might occur for large heat flux. The accuracy of this model for sodium and potassium was similar for small heat flux, but had some differences for large heat flux. Special correlations of deposition rate, entrainment rate and so on should be developed to predict the CHF of liquid metals more accurately.
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Habchi, Chaouki, Nicolas Lamarque, Jerome Helie, and Stéphane Jay. "Experimental and Numerical Investigation of Dispersed and Continuous Liquid Film under Boiling conditions." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4632.

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In this work, both experimental and numerical investigations have been carried out in order to improve the modelling of the vaporization of wall liquid-deposits in internal combustion engines. A comprehensive model is suggested for the vaporization of liquid films in the different boiling regimes, including nucleate boiling regime, the Leidenfrost boiling regime, as well as the transition boiling regime occurring between the two latter. This work extends the validity of the Liquid Film Boiling model (Habchi, Oil & Gas Science and Technology – Rev. IFP, Vol. 65, No. 2, 2010) for dispersed liquid films that may be formed when a dilute spray impinges a wall. A sub-grid liquid film is indeed considered when the wetted-area is smaller than the wall cell-face area. A sessile droplet model is used to estimate the wall area wetted by the liquid film and whether it is resolved by the grid or located in the sub-grid scale (SGS). In addition, a novel Leidenfrost vaporization model is proposed for spray droplets located near a hot wall. The above vaporisation/boiling models has been implemented in the Large-Eddy simulation (LES) AVBP code. The validation has been carried out using two different experiments. First, the experimental lifetime curve of a sessile droplet (Stanglmaier et al., SAE paper 2002-01-0838) has been used for a quantitative validation in the different boiling regimes. Second, the wall impingement of a heptane spray from a typical gasoline injector from Continental Automotive, has been simulated. The numerical results obtained under boiling conditions, are compared to the liquid film footprints and lifetime provided by the Refractive Index Matching (RIM) experiment which is described in this article.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4632
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Simon, Amélie, Meryem Marcelet, Jean-Marc Hérard, Jean-Marc Dorey, and Michel Lance. "A Model for Liquid Films in Steam Turbines and Preliminary Validations." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56148.

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Liquid films in steam turbines, present in usual operating conditions, play a large but poorly understood part in the wetness-born troubles (power losses and erosion). More knowledge is needed to estimate their impacts and lessen their effects. The aim of this paper is to propose and verify a model to predict these liquid films. This model is based on modified Shallow-Water equations (integral formulation). It takes into account inertia, mass transfer, gravity, gas and wall frictions, pressure, surface tension, droplet impacts, rotational effects and is unsteady. A 2D code has been developed to implement this model. A part of the model has been verified with analytical solutions (Riemann problems and inclined lake at rest), has been confronted with the linear stability of falling liquid film and has been validated with the experiment of Hammitt et al. [1] which involves a sheared film under low-pressure steam turbine conditions.
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Ingle, Rahul, Ravi Yadav, Hemant Punekar, and Jing Cao. "Modeling of Particle Wall Interaction and Film Transport Using Eulerian Wall Film Model." In ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8230.

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The growing awareness of pollutant emissions from gas turbines has made it very important to study fuel atomization system, the spray wall interaction and hydrodynamic of film formed on engine walls. A precise fuel spray spatial distribution and efficient fuel air mixing plays important role in improving combustion performance. Cross-flow injection and film atomization technique has been studied extensively for gas turbine engines to achieve efficient combustion. Air blast atomizer is one of these kind of systems used in gas turbine engines which involves shear driven prefilmer secondary atomization. In addition to gas turbine combustor shear driven liquid wall film can be seen in IC engines, rocket nozzles, heat exchangers and also on steam turbine blades. In our work we have used Eulerian Wall Film (EWF) [1] model to simulate the experiment performed by Arienti et al. [2]. In the Arienti’s experiment liquid jet is injected from a nozzle from the top of the chamber. Droplets shed from the jet surface due to primary and later secondary atomization in the presence of high shearing cross flowing air. Further liquid fuel particles hit the wall to form film, film moves subjected to shear from the gas phase. Liquid film can reatomizes due to subgrid processes like stripping, splashing and film breakup. In current study we have validated Arienti et al. [2] experimental data by modeling complex & coupled physics of spray, film and continuous phase and by accounting complex subgrid processes.
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Lan, H., M. Friedrich, B. F. Armaly, and J. A. Drallmeier. "Three-Dimensional Shear Driven Thin Liquid Film in a Duct." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15113.

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Measurements and predictions of three-dimensional shear driven thin liquid films by turbulent air flow in a duct are reported. FLUENT - CFD code is used to perform the numerical simulations and the Reynolds Averaged Navier-Stokes and continuity equations along with the Volume of Fluid (VOF) model and the realizable k-ε turbulence model are implemented for this task. Film thickness and width are reported as a function of air flow rate, liquid film volume flow rate and surface tension, and a comparison with preliminary measured results is made. The thickness of the shear driven liquid film is measured using an interferometric technique that makes use of the phase shift between the reflection of incident light from the top and bottom surfaces of the thin liquid film. The spatial resolution is determined based on the spot size of the incident light, which for the current configuration of the transmitting optics is approximately 10 microns. The resulting fringe pattern is imaged using a high-speed imaging camera operating at 2000 frames per second. The technique has proved successful in measuring thickness between 100 and 900 microns in these shear driven films. Simulation results reveal that higher gas flow velocity decreases the film thickness but increases its width, while higher liquid film flow rate increases the film thickness and increases its width. Reasonable comparison appears to exist between preliminary measured and simulated results.
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Gambaryan-Roisman, T., and P. Stephan. "Evaporation of Gravity- and Gas Flow-Driven Thin Liquid Films in Micro- and Minigrooves." In ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2380.

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Using microstructured wall surfaces may improve the heat transfer performance of falling film or shear-driven film cooling devices enormously. The advantages of the structured surface include the prevention of the formation of dry patches on hot surfaces, the promotion of ultra-thin film evaporation, and a wavy motion of the film that enhances mixing of the liquid. We develop a model describing the hydrodynamics and heat transfer by evaporation of gravity- and gas flow-driven liquid films on grooved surfaces. For low Reynolds numbers or low liquid mass fluxes the heat transfer is governed by the evaporation of the ultra-thin film at a micro region, in the vicinity of the three-phase contact line. We investigate the hydrodynamic stability of the film flow using the long-wave theory. In addition to the films completely covering the wall structure, we study the stability characteristics of a thin liquid film partly covering the grooved wall, so that the flow region is bounded by contact lines. Two cases are analyzed: fully wetting liquids and liquids which form a small but finite contact angle with the wall material.
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Zahedi, Peyman, Hadi Arabnejad Khanouki, Brenton S. McLaury, and Siamack A. Shirazi. "Liquid Film Thickness Prediction in Elbows for Annular Flows." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69389.

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In many industrial applications such as oil and gas production systems and heat exchangers, annular flow is a frequently observed flow regime. A lot of experiments and analysis have been carried out in the last decades in order to determine the thickness of the liquid film in annular flow and in straight pipes; however, published liquid film thickness models and experimental data in bends are scare. This paper presents a model for predicting average liquid film thickness in bends according to the correlations obtained for calculating dimensionless interfacial friction factor as well as dimensionless liquid film thickness in bends. Correlations were obtained based on analysis carried out using a control volume of gas core and utilizing experimental data available in the literature for liquid film thickness in bends. Furthermore, liquid film thickness distribution at the inner and outer bends of elbows were investigated, and a simple analytical model has been developed for predicting film thickness at the outer and inner radii of a bend. It is shown that, the average film thickness calculations from the current model agree with experimental data and results show that the model can predict the film thickness changes based on the flowrates and properties of liquid and gas phases.
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Lopez, Jose M., Ram Mohan, Ovadia Shoham, Luis Gomez, and Gene Kouba. "Modeling of Falling Film in Vertical Downward Two-Phase Pipe Flow." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72329.

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Falling liquid films in vertical pipes are found in a variety of different industrial applications and industrial equipment, such as downcomers, caisson separators and reactors. The hydrodynamics of the falling film in vertical two-phase pipe flow can affect droplet entrainment, gas entrainment, and pressure drop. Therefore, a mechanistic model for prediction of falling liquid film thickness, falling liquid film velocity and a correlation for liquid droplet entrainment fraction in vertical downward liquid-gas systems has been proposed. The falling film model developed is based on applying momentum balance on the liquid film. The liquid film is assumed to be in steady-state, incompressible and free of entrained gas. The mechanistic model includes both the developing and the developed regions. The shear effect between the gas core and the falling liquid film is considered. The liquid droplet entrainment fraction traveling in the gas core is considered and a new correlation for its prediction is proposed. Detailed uncertainty analysis is performed for liquid film thickness and liquid film velocity model predictions, including Monte Carlo simulation. Predicted liquid film thickness, liquid film velocity and liquid droplet entrainment fraction are validated against experimental data for different liquid fluid properties, such as water, Conosol mineral oil (light oil) and Drake mineral oil (heavy oil).
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Reports on the topic "Liquid film model"

1

Sun, J. G., W. T. Sha, and Y. S. Chen. Development of liquid-film tracking models for analysis of AP-600 passive containment cooling system. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10188828.

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