Download or read book Analyse des transitions dans l coulement de Taylor couette faible rapport d aspect written by Miloud Douaya and published by . This book was released on 1989 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'écoulement confiné entre deux cylindres coaxiaux avec le cylindre intérieur tournant et le cylindre extérieur fixe et l'un des systèmes dans lequel différentes instabilités apparaissent. La plupart des travaux expérimentaux et théoriques ont porté essentiellement sur les écoulements dans des cylindres infinis. Donc il apparait nécessaire de voir ce qui se passe dans les écoulements à faible rapport d'aspect où les effets de bords sont importants. Pour cela, nous avons fait une étude par visualisation, ensuite nous avons utilisé pour la première fois la technique électronique avec une très faible quantité de kalliroscope AQ 1000, ce qui a facilité la compréhension des différentes transitions grâce à la visualisation des structures simultanément à la mesure de frottement en paroi. Enfin à l'aide d'un faisceau laser et d'une photo-multiplicateur, nous avons déterminé les fréquences caractéristiques de chaque régime étudié. Les résultats obtenus par ces différentes méthodes constituent un ensemble de données intéressantes permettant l'extension des connaissances actuelles sur le sujet
Download or read book S quences transitoires en coulement de Couette Taylor written by Aomar Ait Aider and published by . This book was released on 1983 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Revue bibliographique concernant la stabilité de l'écoulement confiné entre cylindres coaxiaux tournants. Etude expérimentale par visualisation de l'écoulement entre cylindres coaxiaux; influence du rapport d'aspect sur les cellules de Taylor et les ondes circonférentielles. Etude locale de l'écoulement par polarographie. Caractérisation des différents régimes par l'évolution du gradient moyen de vitesse. Modulation des ondes circonférentielles lors de la transition vers la turbulence. Etude en repère fixe par une méthode locale (polarographie)
Download or read book Instabilit s et turbulence dans l coulement de Taylor Couette written by Ahcène Bouabdallah (auteur d'une thèse de sciences.) and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude de la bir fringence d coulement la transition written by Jean-Paul Decruppe and published by . This book was released on 1988 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optical anisotropy gained by numerous solutions as well as by pure liquids when submitted to the action of an orientating field, is capable of bringing valuable pieces of information on the structure of this field as well as on the physical properties of the particles in solutions. The study of the optical properties arising from this anisotropy only requires the use of a lenearly polarized beam of light on which the medium is going to leave this own characteristics by changing the state of polarization of the light. The flow is created in a conventional Couette cell. It is well known that, in this type of geometry, the hydrodynamical flow undergoes several transistions leading at first to more and more complicated periodical flows, and then, to the turbulence as the angular velocity of the inner rotating cylinder is increased. The aim of this work is to study the behaviour of the properties induced by the flow at the first transition, to work out the theoretical laws controlling this properties and to see in which extend, we can deduce the intrinsec characteristics of the particles. The variation of the extinction angle and of the birefringence intensity is studied at the middle point of the annular gap as a function of the shearing gradient and, for different values of the gradient, as function of the position in the gap. The comparison between the experimental and theoretical curves shows a good agreement in the case of flattened particles (bentonite) but less convincing results for rodlike particles (V.M.T.)
Download or read book Numerical Study of Transitions in Taylor Couette Flow written by Eric Magère and published by . This book was released on 1999 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ECOULEMENT DE TAYLOR COUETTE STRATIFIE written by FRANCOIS.. CATON and published by . This book was released on 1998 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE EST CONSACREE A L'ETUDE EXPERIMENTALE ET THEORIQUE DE L'ECOULEMENT DE TAYLOR-COUETTE EN PRESENCE D'UNE STRATIFICATION AXIALE STABLE. UNE ANALYSE DE STABILITE LINEAIRE PREDIT LE CARACTERE OSCILLATOIRE DU SEUIL D'INSTABILITE. LES VISUALISATIONS MONTRENT QUE LE PREMIER REGIME INSTABLE EST UN REGIME D'ONDES STATIONNAIRES AXISYMETRIQUES. UN MODELE THEORIQUE BASE SUR L'EXISTENCE D'ONDES INTERNES CONFINEES EST EN BON ACCORD AVEC LES MESURES DES FLUCTUATIONS TEMPORELLES DE DENSITE DANS CE REGIME. LE SECOND REGIME EST UN REGIME DE VORTEX NON-AXISYMETRIQUES DONT LA TAILLE VERTICALE EST DIMINUEE PAR LA STRATIFICATION, LES VORTEX ETANT PRESENTS PAR PAIRES A UNE MEME HAUTEUR ET TOURNANT A LA VITESSE MOYENNE DANS L'ENTREFER. LA TRANSITION ENTRE LE REGIME DES ONDES ET CELUI DE VORTEX PRESENTE DE L'HYSTERESIS. UN DIAGRAMME DES BIFURCATIONS DU SYSTEME POUR LES DEUX PREMIERS REGIMES EST ALORS PROPOSE. DANS LE REGIME SUIVANT, NOUS AVONS NOTE LA COEXISTENCE DE STRUCTURES STATIONNAIRES ET DE DEFAUTS. ENFIN NOUS NOUS SOMMES INTERESSES A UN REGIME PRESENTANT DES CELLULES RESSEMBLANT A DES VORTEX DE TAYLOR, MAIS COUPLES PAR PAIRES. CES DEUX REGIMES PRESENTENT DES SPECTRES FAIBLEMENT TURBULENTS. ENFIN, UNE ETUDE DU TRANSPORT D'UN TRACEUR PASSIF DANS LES DIFFERENTS REGIMES A ETE REALISEE, METTANT EN EVIDENCE L'EXISTENCE DE REGIMES DE DIFFUSION ANORMALE AU TEMPS COURTS. AU TEMPS LONGS, UNE DIFFUSION NORMALE EST OBTENUE, LE COEFFICIENT DE DIFFUSION EFFECTIF AUGMENTANT DE FACON QUADRATIQUE AVEC LE TAUX DE ROTATION DU CYLINDRE INTERIEUR.
Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Dynamics of Spatio Temporal Cellular Structures written by Innocent Mutabazi and published by Springer Science & Business Media. This book was released on 2005-12-15 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.
Download or read book On the Continuity of the Gaseous and Liquid States written by J. D. Van Der Waals and published by Courier Corporation. This book was released on 2004-01-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.
Download or read book One dimensional Two phase Flow written by Graham B. Wallis and published by . This book was released on 1969 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling and Experimentation in Two Phase Flow written by Volfango Bertola and published by Springer. This book was released on 2014-05-04 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an up-to-date review of recent advances in the study of two-phase flows, with focus on gas-liquid flows, liquid-liquid flows, and particle transport in turbulent flows. The book is divided into several chapters, which after introducing basic concepts lead the reader through a more complex treatment of the subjects. The reader will find an extensive review of both the older and the more recent literature, with abundance of formulas, correlations, graphs and tables. A comprehensive (though non exhaustive) list of bibliographic references is provided at the end of each chapter. The volume is especially indicated for researchers who would like to carry out experimental, theoretical or computational work on two-phase flows, as well as for professionals who wish to learn more about this topic.
Download or read book Gas liquid Flows written by Barry J. Azzopardi and published by Begell House Publishers. This book was released on 2006-01-01 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Structure of Atmospheric Turbulence written by John Leask Lumley and published by . This book was released on 1964 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Principles of Enhanced Heat Transfer written by Ralph L. Webb and published by Wiley-Interscience. This book was released on 1994-03-28 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indeed, today "second generation" enhancement concepts are routing in the automotive and refrigeration industries to obtain lower cost, smaller heat exchanger size, and higher energy efficiency in system operation. And the aerospace, process, and power generation industries are not far behind.
Download or read book Genmix written by D Brian Spalding and published by Elsevier. This book was released on 2014-05-18 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genmix: A General Computer Program for Two-dimensional Parabolic Phenomena explains a computer program called GENMIX. The main intention of the program is to be used as a tool of instructions. The name of the program is a mixture of two considerations: its generality and its concern for mixing processes. The book aims to help the potential user to understand the physical and mathematical basis of the topic computer program. It is also the aim of the book to make the program applicable to practical problems. The book is arranged in such a way as to parallel a course of lectures and associated computer-workshop sessions wherein the student is allowed to do some elementary computations as soon as he has gained some knowledge of the method. The book contains the mathematical, physical, and computer-coding aspects of the program. Concepts such as the boundary layer, two-dimensional, and steady- flow are defined and discussed in depth. The text will be a useful tool for computer instructors and students.
Download or read book Leaping Ahead written by Judith Masters and published by Springer Science & Business Media. This book was released on 2012-10-19 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leaping Ahead: Advances in Prosimian Biology presents a summary of the state of prosimian biology as we move into the second decade of the 21st century. The book covers a wide range of topics, from assessments of diversity and evolutionary scenarios, through ecophysiology, cognition, behavioral and sensory ecology, to the conservation and survival prospects of this extraordinary and diverse group of mammals. The collection was inspired by an international conference in Ithala, KwaZulu-Natal, South Africa in 2007, where prosimian biologists gathered from Canada, Finland, France, Germany, India, Italy, Japan, Madagascar, South Africa, Tanzania, the United Kingdom, and the United States of America. The meeting reverberated with the passion prosimian researchers feel for their study subjects and with their deep concern for the future of prosimians in the face of ongoing habitat destruction and the burgeoning threat of bushmeat hunting. Chapters for this volume were contributed by researchers from across the globe; they attest to the diversity, vibrancy and rapid growth of prosimian biology, and to the intellectual advances that have revolutionized this field in recent years. Since its earliest beginnings, prosimian research and its resultant literature have had a strong francophone component, and researchers in many prosimian habitat countries are more comfortable reading and writing in French rather than English. French summaries of all chapters have been included. The volume is targeted at researchers, both those entering the field and established scientists, who have an interest in the biology of primates and small mammals. It is also aimed at conservation biologists seeking a deeper understanding of the faunas and conservation developments in Africa, Madagascar and Southeast Asia, and anyone who has an interest in discovering the true diversity of our order, the Primates.
