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Contribution A La Simulation Lagrangienne De La Dispersion Et De Levaporation De Gouttelettes
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Book Synopsis Contribution à la simulation lagrangienne de la dispersion et de l'évaporation de gouttelettes by : Abdelkader Chikaoui
Download or read book Contribution à la simulation lagrangienne de la dispersion et de l'évaporation de gouttelettes written by Abdelkader Chikaoui and published by . This book was released on 1999 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail présenté dans cette thèse est consacré à l'étude des écoulements diphasiques dilués où la phase dispersée est constituée de gouttelettes susceptibles de s'évaporer. Une approche dite lagrangienne a été adoptée pour le traitement de la phase dispersée. Elle consiste à simuler la dispersion d'un nombre relativement important d'inclusions afin de réaliser des statistiques par simple moyenne sur leurs caractéristiques. L'idée est de résoudre la loi fondamentale de la dynamique pour chaque inclusion. On simule le mouvement des inclusions dans l'écoulement, on déduit alors des termes d' échange de quantité de mouvement, d'énergie, de chaleur, ... entre les phases que l'on réintroduit dans les équations de la phase continue: c'est un couplage à deux sens (« two way coupling »). Lorsque l'écoulement est suffisamment dilué, le couplage retour (des inclusions vers le fluide) peut être négligé et les équations de la phase continue se ramènent aux équations de Navier-Stockes classiques (« one way coupling »). La fluctuation de vitesse du fluide le long de la trajectoire de chaque particule est simulée à l'aide d'un modèle stochastique. Le phénomène de vaporisation est pris en compte par un modèle à conduction infinie disponible dans la littérature. Cette approche se traduit sur le plan numérique par un couplage à un code existant, destiné à l'origine au calcul d'écoulements dans des géométries complexes, d'un module de calcul lagrangien capable de fournir des termes sources qui modélisent l'action d'inclusions sur le fluide. La validation du code a été effectuée tout d'abord en l'absence d'évaporation sur l'expérience classique de Hishida et Maeda, qui a servi de cas test à pratiquement toutes les simulations lagrangiennes de ce type. Les résultats concernant l'évaporation de gouttes montrent globalement une bonne cohérence avec les prédictions d'un code développé au CORIA.
Book Synopsis Simulation de l'évaporation de goutelettes en écoulement turbulent suivant une approche lagrangienne by : Marie-Sophie Grancher
Download or read book Simulation de l'évaporation de goutelettes en écoulement turbulent suivant une approche lagrangienne written by Marie-Sophie Grancher and published by . This book was released on 1990 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE PORTE SUR L'EVAPORATION DE GOUTTELETTES EN ECOULEMENT TURBULENT. UN MODELE DE VAPORISATION DE GOUTTES EST COUPLE AVEC LE CODE LAGRANGIEN DE DISPERSION PARTICULAIRE PALAS. IL S'AGIT D'UN MODELE QUASI-STATIONNAIRE, A SYMETRIE SPHERIQUE, PERMETTANT DE CALCULER LE CHAUFFAGE DES GOUTTES. LES PHENOMENES DE CONVECTION SONT PRIS EN COMPTE PAR L'INTERMEDIAIRE DE CORRELATIONS. L'INFLUENCE DES FLUCTUATIONS DE VITESSE, DE TEMPERATURE, ET DE FRACTION MASSIQUE DE VAPEUR DU MILIEU AMBIANT SUR L'EVAPORATION DE GOUTTELETTES EST SIMULEE DANS UNE CONFIGURATION DE TURBULENCE DE GRILLE. LE COUPLAGE ENTRE LA PHASE DISPERSEE ET LA TURBULENCE, PRENANT EN COMPTE LE CHANGEMENT DE PHASE, EST ENSUITE ETUDIE. DES RESULTATS SONT PRESENTES DANS LE CAS D'UN JET ROND TURBULENT
Book Synopsis CONTRIBUTION A L'ETUDE DE LA SIMULATION NUMERIQUE DE LA DISPERSION DE PARTICULES DANS UN ECOULEMENT TURBULENT by : SUN.. MOON
Download or read book CONTRIBUTION A L'ETUDE DE LA SIMULATION NUMERIQUE DE LA DISPERSION DE PARTICULES DANS UN ECOULEMENT TURBULENT written by SUN.. MOON and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: UN MODELE DE SIMULATION POUR LA TRAJECTOIRE DES PARTICULES DANS UN ECOULEMENT TURBULENT A ETE ETABLI EN CONSIDERANT LES CORRELATIONS TEMPORELLES ET SPATIALES DU POINT DE VUE LAGRANGIEN. UNE METHODE DE MONTE CARLO A ETE UTILISEE POUR DETERMINER LES VALEURS ALEATOIRES DES PROPRIETES TURBULENTES. AU COURS DE LA CONSTRUCTION DES TRAJECTOIRES, LA VITESSE ET LA POSITION DE PARTICULES INDIVIDUELLES SONT OBTENUES A CHAQUE INSTANT. A PARTIR DE CELLES-CI, NOUS AVONS ETUDIE LES CARACTERISTIQUES DE LA DISPERSION D'UN ENSEMBLE DE PARTICULES DANS UN ECOULEMENT DE TURBULENCE DE GRILLE, PUIS CELLE DE PARTICULES PASSIVES ET REACTIVES DANS UN ECOULEMENT TURBULENT CISAILLE. LES RESULTATS DU CALCUL ONT ETE COMPARES A CEUX MESURES PAR EXPERIENCES CORRESPONDANTES. LA COMPLEXITE DU MECANISME DE LA TURBULENCE ET LE MANQUE DE CONNAISSANCES THEORIQUES ET DE DONNEES EXPERIMENTALES, A CONDUIT A FORMULER UN CERTAIN NOMBRE D'HYPOTHESES POUR PERMETTRE LE CALCUL. NOUS AVONS OBSERVE DE BONNES CONCORDANCES DE RESULTATS SIMULES PAR RAPPORT A CEUX MESURES. EN PARTICULIER, L'APPLICATION DE LA METHODE DE CALCUL MISE AU POINT AUX CAS DE LA CORRELATION LAGRANGIENNE ET DE L'EVAPORATION D'AEROSOL, FOURNIT UNE ALTERNATIVE INTERESSANTE AUX TECHNIQUES DU CALCUL GLOBAL GENERALEMENT UTILISES
Book Synopsis Dispersion et mélange turbulents de particules solides et de gouttelettes par une simulation des grandes échelles et une modélisation stochastique lagrangienne by : Ivana Vinkovic
Download or read book Dispersion et mélange turbulents de particules solides et de gouttelettes par une simulation des grandes échelles et une modélisation stochastique lagrangienne written by Ivana Vinkovic and published by . This book was released on 2005 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une simulation des grandes échelles est utilisée pour étudier la dispersion de scalaires passifs, des particules solides et des gouttelettes dans une couche limite turbulente. Etant donné que de nombreux processus physico-chimiques, comme les réactions chimiques, les collisions, la coalescence, la fragmentation ou l'évaporation des gouttelettes ont lieu à des échelles bien plus petites que la maille, l'équation stochastique de Langevin est utilisée pour déterminer la composante petite échelle de la vitesse des particules suivies. Le modèle stochastique est exprimé uniquement en fonction des grandeurs obtenues par la SGE avec le modèle dynamique de sous-maille Germano et al. (1991). Enfin, la coalescence et la fragmentation sont introduites par un modèle probabiliste de coalescence et de fragmentation inspiré du modèle stochastique de fragmentation de Apte et al. (2003). Les résultats des différents modèles introduits sont confrontés à diverses expériences de laboratoire.
Book Synopsis Fluid Dynamics and Transport of Droplets and Sprays by : W. A. Sirignano
Download or read book Fluid Dynamics and Transport of Droplets and Sprays written by W. A. Sirignano and published by Cambridge University Press. This book was released on 2010-01-11 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
Book Synopsis Fundamentals of Latex Film Formation by : Joseph Keddie
Download or read book Fundamentals of Latex Film Formation written by Joseph Keddie and published by Springer Science & Business Media. This book was released on 2010-02-18 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has emerged out of our long-time research interests on the topic of latex film formation. Over the years we have built up a repertoire of slides used in conference presentations, short courses and tutorials on the topic. The story presented in this book has thereby taken shape as it has been told and re-told to a mix of academic and industrial audiences. The book presents a wide body of work accumulated by the polymer colloids community over the past five decades, but the selection of examples has been flavoured by our particular experimental interests and development of mathematical models. We intend the book to be a starting point for academic and industrial scientists beginning research on latex film formation. The emphasis is on fundam- tal mechanisms, however, and not on applications nor on specific effects of formu- tions. We hope that the book consolidates the understanding that has been achieved to-date in the literature in a more comprehensive way than is possible in a review article. We trust that the reader will appreciate the fascination of the topic.
Book Synopsis Cellular Automata Modeling of Physical Systems by : Bastien Chopard
Download or read book Cellular Automata Modeling of Physical Systems written by Bastien Chopard and published by Cambridge University Press. This book was released on 2005-06-30 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a self-contained introduction to cellular automata and lattice Boltzmann techniques. Beginning with a chapter introducing the basic concepts of this developing field, a second chapter describes methods used in cellular automata modeling. Following chapters discuss the statistical mechanics of lattice gases, diffusion phenomena, reaction-diffusion processes and non-equilibrium phase transitions. A final chapter looks at other models and applications, such as wave propagation and multiparticle fluids. With a pedagogic approach, the volume focuses on the use of cellular automata in the framework of equilibrium and non-equilibrium statistical physics. It also emphasises application-oriented problems such as fluid dynamics and pattern formation. The book contains many examples and problems. A glossary and a detailed bibliography are also included. This will be a valuable book for graduate students and researchers working in statistical physics, solid state physics, chemical physics and computer science.
Book Synopsis Droplets and Sprays by : Sergei Sazhin
Download or read book Droplets and Sprays written by Sergei Sazhin and published by Springer. This book was released on 2014-05-19 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a clear and systematic description of droplets and spray dynamic models, this book maximises reader insight into the underlying physics of the processes involved, outlines the development of new physical and mathematical models and broadens understanding of interactions between the complex physical processes which take place in sprays. Complementing approaches based on the direct application of computational fluid dynamics (CFD), Droplets and Sprays treats both theoretical and practical aspects of internal combustion engine process such as the direct injection of liquid fuel, subcritical heating and evaporation. Including case studies that illustrate the approaches relevance to automotive applications, it is also anticipated that the described models can find use in other areas such as in medicine and environmental science.
Book Synopsis Droplets and Sprays by : Saptarshi Basu
Download or read book Droplets and Sprays written by Saptarshi Basu and published by Springer. This book was released on 2017-12-11 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on droplets and sprays relevant to combustion and propulsion applications. The book includes fundamental studies on the heating, evaporation and combustion of individual droplets and basic mechanisms of spray formation. The contents also extend to the latest analytical, numerical and experimental techniques for investigating the behavior of sprays in devices like combustion engines and gas turbines. In addition, the book explores several emerging areas like interactions between sprays and flames and the dynamic characteristics of spray combustion systems on the fundamental side, as well as the development of novel fuel injectors for specific devices on the application side. Given its breadth of coverage, the book will benefit researchers and professionals alike.
Book Synopsis Fundamentals of Heat and Mass Transfer by : Theodore L. Bergman
Download or read book Fundamentals of Heat and Mass Transfer written by Theodore L. Bergman and published by John Wiley & Sons. This book was released on 2020-07-08 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: With Wiley’s Enhanced E-Text, you get all the benefits of a downloadable, reflowable eBook with added resources to make your study time more effective. Fundamentals of Heat and Mass Transfer 8th Edition has been the gold standard of heat transfer pedagogy for many decades, with a commitment to continuous improvement by four authors’ with more than 150 years of combined experience in heat transfer education, research and practice. Applying the rigorous and systematic problem-solving methodology that this text pioneered an abundance of examples and problems reveal the richness and beauty of the discipline. This edition makes heat and mass transfer more approachable by giving additional emphasis to fundamental concepts, while highlighting the relevance of two of today’s most critical issues: energy and the environment.
Book Synopsis Global Solutions of Reaction-Diffusion Systems by : Franz Rothe
Download or read book Global Solutions of Reaction-Diffusion Systems written by Franz Rothe and published by Springer. This book was released on 2006-12-08 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Environmental Engineering by : Thomas H. Kuehn
Download or read book Thermal Environmental Engineering written by Thomas H. Kuehn and published by Pearson. This book was released on 1998 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest edition of the classic book grounded in the fundamentals. It introduces heating, ventilation, and air conditioning starting with basic principles of engineering leading to the latest HVAC design practice. Its engineering approach emphasizes fundamentals and realistic applications. Acknowledging numerous approaches to all engineering problems, the book presents alternate approaches and describes why some approaches work best in specific applications and what compromises are made using each of them. Provides carefully worked examples with step-by-step solutions listing assumptions, reference equations, and supporting material. Incorporates a careful use of easy-to-follow units and conversion factors providing basic mass and energy balances. The third edition of Thermal Environmental Engineering has been updated to reflect current approaches as well as new chapters on energy estimation, air handling system design, and piping system design. Discusses new replacement refrigerants as well as environmental issues. Presents single and multiple zone psychronetric systems; moisture transport in building structures; and the latest topics on indoor air quality and human comfort. An essential reference book for professional mechanical engineers.
Book Synopsis Almost-periodic Functions in Abstract Spaces by : Samuel Zaidman
Download or read book Almost-periodic Functions in Abstract Spaces written by Samuel Zaidman and published by Pitman Advanced Publishing Program. This book was released on 1985 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research not presents recent results in the field of almost-periodicity. The emphasis is on the study of vector-valued almost-periodic functions and related classes, such as asymptotically almost-periodic or almost-automorphic functions. Many examples are given, and applications are indicated. The first three chapters form a self-contained introduction to the study of continuity, derivability and integration in locally convex or Banach spaces. The remainder of the book is devoted to almost-periodicity and related topics. The functions are defined on IR, IR[superscript n] or an abstract group; the range is a Banach or a Hilbert space. Although treatment of the material related to pure mathematics, the theory has many applications in the area of abstract differential equations.
Book Synopsis Parabolic Equations in Biology by : Benoît Perthame
Download or read book Parabolic Equations in Biology written by Benoît Perthame and published by Springer. This book was released on 2015-09-09 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents several fundamental questions in mathematical biology such as Turing instability, pattern formation, reaction-diffusion systems, invasion waves and Fokker-Planck equations. These are classical modeling tools for mathematical biology with applications to ecology and population dynamics, the neurosciences, enzymatic reactions, chemotaxis, invasion waves etc. The book presents these aspects from a mathematical perspective, with the aim of identifying those qualitative properties of the models that are relevant for biological applications. To do so, it uncovers the mechanisms at work behind Turing instability, pattern formation and invasion waves. This involves several mathematical tools, such as stability and instability analysis, blow-up in finite time, asymptotic methods and relative entropy properties. Given the content presented, the book is well suited as a textbook for master-level coursework.
