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Contribution A Letude Des Forces Exercees Par Un Liquide Sur Une Bulle De Gaz
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Book Synopsis Contribution à l'étude des forces exercées par un liquide sur une bulle de gaz by : Ahmed Naciri
Download or read book Contribution à l'étude des forces exercées par un liquide sur une bulle de gaz written by Ahmed Naciri and published by . This book was released on 1992 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: La modélisation des écoulements diphasiques à bulles se heurte à un certain nombre de difficultés liées essentiellement à la méconnaissance des mécanismes physiques à l'échelle de la bulle, en particulier la force exercée par un liquide en mouvement non uniforme sur la bulle et les effets d'interaction hydrodynamique entre bulles. De ce fait, nous nous sommes intéressés dans ce travail à trois mécanismes de base : -La quantification de la force de portance, soit expérimentalement dans le cas d'une bulle placée dans un écoulement en rotation ; ceci nous a permis d'évaluer le coefficient de portance et de montrer que sa valeur est comprise entre celle obtenue pour un fluide parfait et celle déduite des simulations numériques pour une sphère solide ; soit théoriquement pour un corps axisymétrique place dans un écoulement faiblement cisaillé de fluide parfait ou on a montre l'égalité entre le coefficient de portance et celui de masse ajoutée. -La détermination expérimentale de la quantité de fluide déplacé par une bulle isolée et la comparaison de ce phénomène à celui de masse ajoutée. II s'est avéré dans cette étude que lorsque l'interface de la bulle demeure approximativement sphérique on a l'égalité entre ces deux quantités. -L'évaluation de la force mutuelle d'interaction entre deux bulles de même diamètre montant dans un liquide au repos. Les résultats sont comparés à la théorie de fluide parfait où on montre que celle-ci décrit correctement l'interaction lorsque la répartition du champ de pression constitue l'effet dominant. Ceci tombe en défaut lorsque les effets du sillage sont ressentis par l'une des deux bulles. L'utilisation du résultat concernant la force de portance dans un code de calcul développé au Laboratoire montre que la démarche suivie dans le cadre de ce travail peut aider à l'amélioration des lois de fermeture utilisées dans les modélisations des écoulements a bulles.
Book Synopsis Fluid Dynamics of Particles, Drops, and Bubbles by : Eric Loth
Download or read book Fluid Dynamics of Particles, Drops, and Bubbles written by Eric Loth and published by Cambridge University Press. This book was released on 2023-06-30 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: A modern presentation of multiphase flow, from basic principles to state-of-the-art research. Explains dispersed fluid dynamics for bubbles, drops, or solid particles, incorporating detailed theory, experiments, simulations, and models while considering applications and recent cutting-edge advances. The book demonstrates the importance of multiphase flow in engineering and natural systems, considering particle size distributions, shapes and trajectories as well as deformation of fluid particles and multiphase flow numerical methods. The scope of the book also includes coupling physics between particles and turbulence through dispersion and modulation, and specific phenomena such as gravitational settling and collisions for solid particles, drops and bubbles. Featuring over eighty homework problems for each of the primary chapters, including theory-based and engineering application questions. The comprehensive coverage will give the reader a solid grounding for multiphase flow research and design, applicable to current and future engineering. This is an ideal resource for graduate students, researchers and professionals.
Book Synopsis Thermo-Fluid Dynamics of Two-Phase Flow by : Mamoru Ishii
Download or read book Thermo-Fluid Dynamics of Two-Phase Flow written by Mamoru Ishii and published by Springer Science & Business Media. This book was released on 2010-11-10 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermo-fluid Dynamics of Two-Phase Flow, Second Edition is focused on the fundamental physics of two-phase flow. The authors present the detailed theoretical foundation of multi-phase flow thermo-fluid dynamics as they apply to: Nuclear reactor transient and accident analysis; Energy systems; Power generation systems; Chemical reactors and process systems; Space propulsion; Transport processes. This edition features updates on two-phase flow formulation and constitutive equations and CFD simulation codes such as FLUENT and CFX, new coverage of the lift force model, which is of particular significance for those working in the field of computational fluid dynamics, new equations and coverage of 1 dimensional drift flux models and a new chapter on porous media formulation.
Book Synopsis In Fascination of Fluid Dynamics by : Arie Biesheuvel
Download or read book In Fascination of Fluid Dynamics written by Arie Biesheuvel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Fascination of Fluid Dynamics contains a collection of papers by international experts in hydrodynamics, based on oral presentations at a symposium held in honour of Professor Leen van Wijngaarden on his 65th birthday. The book begins with a personal sketch of his life and scientific career. It continues with a mixture of papers that address recent developments in various branches of fluid mechanics. Many of the papers cover different aspects of multiphase flows: bubble dynamics, cavitation, bubbles and particles in turbulent flows, suspension flows, and wave phenomena in fluidised beds. Other topics that are addressed include: dynamics of jets, shock waves, MHD turbulence, selforganisation phenomena in 2D turbulence, vortex rings and the thermodynamics of tropical cyclones. This edited volume will be valuable reading for researchers, engineers and students interested in hydrodynamics, and in particular in multiphase flows.
Book Synopsis Multiphase Flow Dynamics 1 by : Nikolay Ivanov Kolev
Download or read book Multiphase Flow Dynamics 1 written by Nikolay Ivanov Kolev and published by Springer Science & Business Media. This book was released on 2007-06-08 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. In its third extended edition this monograph contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations, providing a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present first volume the fundamentals of multiphase dynamics are provided. This third edition includes various updates, extensions and improvements in all book chapters.
Book Synopsis Multiphase Flow Dynamics 2 by : Nikolay Ivanov Kolev
Download or read book Multiphase Flow Dynamics 2 written by Nikolay Ivanov Kolev and published by Springer Science & Business Media. This book was released on 2007-05-21 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. In its third extended edition this book contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations. This book provides a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present second volume the mechanical and thermal interactions in multiphase dynamics are provided. This third edition includes various updates, extensions, improvements and corrections.
Book Synopsis Multiphase Flow Dynamics 4 by : Nikolay Ivanov Kolev
Download or read book Multiphase Flow Dynamics 4 written by Nikolay Ivanov Kolev and published by Springer Science & Business Media. This book was released on 2011-09-24 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present Volume 4 of the successful monograh package “Multiphase Flow Dynamics”is devoted to selected Chapters of the multiphase fluid dynamics that are important for practical applications but did not find place in the previous volumes. The state of the art of the turbulence modeling in multiphase flows is presented. As introduction, some basics of the single phase boundary layer theory including some important scales and flow oscillation characteristics in pipes and rod bundles are presented. Then the scales characterizing the dispersed flow systems are presented. The description of the turbulence is provided at different level of complexity: simple algebraic models for eddy viscosity, simple algebraic models based on the Boussinesq hypothesis, modification of the boundary layer share due to modification of the bulk turbulence, modification of the boundary layer share due to nucleate boiling. The role of the following forces on the mathematical description of turbulent flows is discussed: the lift force, the lubrication force in the wall boundary layer, and the dispersion force. A pragmatic generalization of the k-eps models for continuous velocity field is proposed containing flows in large volumes and flows in porous structures. A Methods of how to derive source and sinks terms for multiphase k-eps models is presented. A set of 13 single- and two phase benchmarks for verification of k-eps models in system computer codes are provided and reproduced with the IVA computer code as an example of the application of the theory. This methodology is intended to help other engineers and scientists to introduce this technology step-by-step in their own engineering practice. In many practical application gases are solved in liquids under given conditions, released under other conditions and therefore affecting technical processes for good of for bad. Useful information on the solubility of oxygen, nitrogen, hydrogen and carbon dioxide in water under large interval of pressures and temperatures is collected, and appropriate mathematical approximation functions are provided. In addition methods for the computation of the diffusion coefficients are described. With this information solution and dissolution dynamics in multiphase fluid flows can be analyzed. For this purpose the non-equilibrium absorption and release on bubble, droplet and film surfaces under different conditions is mathematically described. A systematic set of internally consistent state equations for diesel fuel gas and liquid valid in broad range of changing pressure and temperature is provided. This new second edition includes various updates, extensions, improvements and corrections. In many practical application gases are solved in liquids under given conditions, released under other conditions and therefore affecting technical processes for good of for bad. Useful information on the solubility of oxygen, nitrogen, hydrogen and carbon dioxide in water under large interval of pressures and temperatures is collected, and appropriate mathematical approximation functions are provided. In addition methods for the computation of the diffusion coefficients are described. With this information solution and dissolution dynamics in multiphase fluid flows can be analyzed. For this purpose the non-equilibrium absorption and release on bubble, droplet and film surfaces under different conditions is mathematically described. A systematic set of internally consistent state equations for diesel fuel gas and liquid valid in broad range of changing pressure and temperature is provided. This new second edition includes various updates, extensions, improvements and corrections.
Book Synopsis Two-Fluid Model Stability, Simulation and Chaos by : Martín López de Bertodano
Download or read book Two-Fluid Model Stability, Simulation and Chaos written by Martín López de Bertodano and published by Springer. This book was released on 2016-11-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the linear and nonlinear two-phase stability of the one-dimensional Two-Fluid Model (TFM) material waves and the numerical methods used to solve it. The TFM fluid dynamic stability is a problem that remains open since its inception more than forty years ago. The difficulty is formidable because it involves the combined challenges of two-phase topological structure and turbulence, both nonlinear phenomena. The one dimensional approach permits the separation of the former from the latter.The authors first analyze the kinematic and Kelvin-Helmholtz instabilities with the simplified one-dimensional Fixed-Flux Model (FFM). They then analyze the density wave instability with the well-known Drift-Flux Model. They demonstrate that the Fixed-Flux and Drift-Flux assumptions are two complementary TFM simplifications that address two-phase local and global linear instabilities separately. Furthermore, they demonstrate with a well-posed FFM and a DFM two cases of nonlinear two-phase behavior that are chaotic and Lyapunov stable. On the practical side, they also assess the regularization of an ill-posed one-dimensional TFM industrial code. Furthermore, the one-dimensional stability analyses are applied to obtain well-posed CFD TFMs that are either stable (RANS) or Lyapunov stable (URANS), with the focus on numerical convergence.
Book Synopsis Contribution à l'étude des forces hydrodynamiques agissant sur une bulle en régime faiblement inertiel by : Yann Juaneda
Download or read book Contribution à l'étude des forces hydrodynamiques agissant sur une bulle en régime faiblement inertiel written by Yann Juaneda and published by . This book was released on 2006 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: La dynamique de bulles isolées dans un écoulement de Couette laminaire a étudiée expérimentalement. Les trajectoires des bulles ont été analysées par traitement d'images. A partir des résulats les coefficients dynamiques de portance et de traînée ont pu être obtenus. Les expériences réalisées en laboratoire et en condition de microravité ont permis de couvrir une gamme de nombre de Reynolds de bulles de 0,01 à 1. Le dispositif expérimental composé de deux cylindres horizontaux co-axiaux permet d'obtenir des positions d'équilibre pour les bulles dans certaines conditions. Une étude théorique a permis de déterminer la stabilité de ces positions d'équilibre. A partir de ces positions d'équilibre les coefficients de traînée et de portance ont pu être déterminés expérimentalement avec une grande précision. L'influence de la proximité de la paroi a pu être quantifiée sur la dynamique et comparée à des modèles analytiques.
Book Synopsis Cavitation and Gas-liquid Flow in Fluid Machinery and Devices by :
Download or read book Cavitation and Gas-liquid Flow in Fluid Machinery and Devices written by and published by . This book was released on 1994 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2008 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude des forces intermoléculaires en liaison avec l'équation d'état des gaz et les perturbations des raies spectrales sous haute pression by : René Bergeon
Download or read book Contribution à l'étude des forces intermoléculaires en liaison avec l'équation d'état des gaz et les perturbations des raies spectrales sous haute pression written by René Bergeon and published by . This book was released on 1958 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavitation and Multiphase Flow written by and published by . This book was released on 1994 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude de l'entraînement d'un liquide par un gaz by : El-Madani Bel-Khadir
Download or read book Contribution à l'étude de l'entraînement d'un liquide par un gaz written by El-Madani Bel-Khadir and published by . This book was released on 1973 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude d'un écoulement gaz-liquide dans un élargissement brusque by : Shittu Omeiza Suleman
Download or read book Contribution à l'étude d'un écoulement gaz-liquide dans un élargissement brusque written by Shittu Omeiza Suleman and published by . This book was released on 1990 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une étude théorique et expérimentale d'un écoulement à bulles à travers un élargissement brusque est présentée. La banque de données obtenue nous a permis sur le plan global d'invalider un certain nombre de corrélations existantes concernant le taux de vide, le frottement pariétal et la chute de pression singulière, et de proposer de meilleurs outils pour le calcul de ces paramètres. En particulier, on note que la prise en compte du frottement pariétal dans le modèle semi-empirique élaboré pour le calcul de chute de pression singulière apporte une amélioration non négligeable. Sur le plan local, nos résultats ont permis de donner une tendance générale de l'organisation de l'écoulement au voisinage immédiat de la singularité. En particulier, nous avons pu déterminer les longueurs d'établissement, ainsi que les tailles des deux tourbillons contrarotatifs pour plusieurs situations. Le caractère instationnaire de la position du point de recollement a été mis en évidence par une analyse statistique. Celui-ci semble osciller autour d'une position moyenne sans fréquence privilégiée
Book Synopsis Multiphase Flow Dynamics 2 by : Nikolay Ivanov Kolev
Download or read book Multiphase Flow Dynamics 2 written by Nikolay Ivanov Kolev and published by Springer Science & Business Media. This book was released on 2005-08-15 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. In its third extended edition this book contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations. This book provides a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present second volume the mechanical and thermal interactions in multiphase dynamics are provided. This third edition includes various updates, extensions, improvements and corrections.
