Download or read book Ecoulements de Type Rotor Stator Soumis Un Flux Axial written by Sebastien Poncet and published by Omniscriptum. This book was released on 2010-07 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude expérimentale et numérique porte sur les écoulements rotor-stator soumis à un flux axial. Des mesures par LDA sont comparées à un modèle de transport des tensions de Reynolds, RSM. Pour des écoulements de type Batchelor, des lois analytiques simples permettant de prédire le taux de rotation du fluide à partir des paramètres de l''écoulement ont été obtenues. Lorsqu''un fort flux centrifuge est imposé, la structuration de l''écoulement devient de type Stewartson avec une seule couche limite sur le rotor. La transition entre ces deux structurations est caractérisée par un nombre de Rossby basé sur l''entrefer entre le rotor et la virole. Les prédictions du modèle RSM et les mesures de vitesse sont en bon accord pour les champs moyen et turbulent pour les deux structurations. L''influence d''un flux sur la stabilité de ces écoulements a également été étudiée par visualisations. Tous les motifs observés en cavité fermée subsistent en présence de flux mais avec des seuils d''apparition décalés. De nouvelles instabilités apparaissent également dont une de type crossflow, qui se développe sous la forme de spirales localisées en périphérie de la cavité.
Download or read book coulements de type rotor stator soumis un flux axial written by Sébastien Poncet and published by . This book was released on 2005 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude expérimentale et numérique porte sur la caractérisation des écoulements de type rotor-stator soumis à un flux axial selon deux angles: turbulence et stabilité. De nouvelles mesures par LDA sont comparées aux prévisions d'un modèle avancé de transport des tensions de Reynolds essentiellement pour les écoulements turbulents à couches limites séparées. Cette confrontation a permis d'approfondir les propriétés des écoulements confinés soumis à une forte rotation. Dans le cas d'une cavité fermée ou lorsqu'un flux centripète est imposé, la structuration de l'écoulement est de type Batchelor: la couche limite du rotor et celle du stator sont séparées par noyau central en rotation. La vitesse tangentielle dans le noyau est proportionnelle à la vitesse locale du disque avec un coefficient de proportionnalité K. Ce coefficient peut être déterminé à partir d'un coefficient local de débit selon une loi analytique dont les deux coefficients dépendent uniquement du taux de prérotation du fluide. Cette loi est indépendante de l'espace interdisque et de la géométrie. Pour de forts flux centrifuges, la structuration de l'écoulement devient de type Stewartson avec une couche limite unique sur le rotor. La transition entre ces deux structurations peut être caractérisée par un nombre de Rossby basé sur l'espace radial entre le rotor et le cylindre extérieur. Cette transition est continue et indépendante de l'espace interdisque et de la géométrie. La turbulence est concentrée dans les couches limites et augmente du centre vers la périphérie du disque. Lorsqu'un flux est imposé, la zone relaminarisée proche de l'axe en cas de cavité fermée, disparaît et la turbulence est maximale près des zones d'entrée et de sortie du fluide. L'influence d'un flux sur la stabilité des écoulements de type Couette de torsion à couches limites jointes, de type mixte et de type Batchelor a également été étudiée à partir de visualisations de l'écoulement. Les réseaux de cercles concentriques et de spirales mais aussi les ondes solitaires et les spots turbulents observés en cavité fermée subsistent en présence d'un flux mais les seuils d'apparition sont décalés. De nouvelles instabilités essentiellement sous la forme de spirales apparaissent également. Une instabilité de type " crossflow ", générique de ce type d'écoulement, a été observée. Elle se développe sous la forme de spirales positives localisées en périphérie de la cavité. Elle est due aux points d'inflexion dans les profils axiaux des vitesses moyennes radiale et tangentielle.
Download or read book Flow and Heat Transfer in Rotating disc Systems written by John Michael Owen and published by . This book was released on 1989 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussing fluid mechanics and heat transfer in rotating-disc systems, this text simplifies and extends existing information to provide a basic understanding of the subject. Physical insight, mathematical models and experimental data are used to explain the flow structure and provide theoretical methods and correlations which will be of use to research workers and designers.
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 Sleepiness and Human Impact Assessment written by Sergio Garbarino and published by Springer Science & Business Media. This book was released on 2014-04-08 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The World Health Organization supports tools and initiatives in Health Impact Assessment to dynamically improve health and well-being across different sectors. Human Impact Assessment (HuIA) is a relatively new concept. It describes an integrated process that encompasses both Health Impact Assessment and Social Impact Assessment and is used to anticipate the effects of programs, projects and decisions on human health and welfare. Sleep occupies approximately one-third of our lives, but its human impact remains largely unrecognized. The prevalence of excessive sleepiness is recognized to be increasing in industrialized societies. Without doubt, sleepiness and fatigue have high costs in terms of both lives lost and socioeconomic impact. For example, the National Highway Traffic Safety Administration estimates that up to 4% of all fatal crashes are caused by drowsy drivers and that as many as 100,000 deaths per year in the United States may be due to fatigue-related medical errors. Sleepiness and Human Impact Assessment provides a uniquely comprehensive exploration of many different facets of sleepiness in our 24-hour society from the new HuIA point of view. Among the covered issues are the physiology and pathophysiology of sleep, its relationship to daytime alertness, fatigue and drugs, the relevance of sleep-related fatigue in various occupational settings and public safety. This book will be of assistance to physicians, occupational health professionals, ergonomists, researchers and decision-makers as they strive to understand the full significance of sleepiness and to create a culture of accountability in everyday life without sleep-related risks.
Download or read book Handbook of Electric Machines written by S. A. Nasar and published by McGraw-Hill Companies. This book was released on 1987 with total page 616 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 Fat Crystal Networks written by Alejandro G. Marangoni and published by CRC Press. This book was released on 2004-12-27 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first authoritative source on the subject, this reference discusses the various levels of structure that influence the macroscopic physical properties of fat crystal networks. Fat Crystal Networks summarizes 50 years of structural research in the field, as well as a wealth of information on fat crystal networks pertinent to real-world challenge
Download or read book Heat Transfer in Gas Turbine Systems written by Richard J. Goldstein and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores recent developments in heat transfer and thermal control applied to modern high-temperature gas turbine systems. It examines experimental results and techniques computational studies and methods and design recommendations. Aspects of heat transfer in rotating machinery are studied as well as thermal aspects of other sections of the turbine (e.g. the compressor). Proceedings of an August 2000 conference.
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Download or read book Fundamentals of Heat and Mass Transfer written by S. C. Bhatia and published by . This book was released on 2002-02-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific Canadian Mechanics Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.
Download or read book Metal Forming written by Taylan Altan and published by ASM International(OH). This book was released on 1983 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Briefly reviews the basic principles of metal forming but major emphasis is on the latest developments in the design of metal-forming operations and tooling. Discusses the position of metal forming in manufacturing and considers a metal-forming process as a system consisting of several interacting variables. Includes an overall review and classification of all metal-forming processes. The fundamentals of plastic deformation - metal flow, flow stress of metals and yield criteria - are discussed, as are significant practical variables of metal- forming processes such as friction, temperatures and forming machines and their characteristics. Examines approximate methods of analyzing simple forming operations, then looks at massive forming processes such as closed-die forging, hot extrusion, cold forging/ extrusion, rolling and drawing (discussion includes the prediction of stresses and load in each process and applications of computer-aided techniques). Recent developments in metal-forming technology, including CAD/CAM for die design and manufacture, are discussed, and a review of the latest trends in metal flow analysis and simulations.
Download or read book Hired Farm Workers written by United States. Employment Standards Administration and published by . This book was released on 1971 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods for Fluid Dynamics written by Joel H Ferziger and published by . This book was released on 1996-02-14 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chaos and Integrability in Nonlinear Dynamics written by Michael Tabor and published by Wiley-Interscience. This book was released on 1989-01-18 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the newer field of chaos in nonlinear dynamics as a natural extension of classical mechanics as treated by differential equations. Employs Hamiltonian systems as the link between classical and nonlinear dynamics, emphasizing the concept of integrability. Also discusses nonintegrable dynamics, the fundamental KAM theorem, integrable partial differential equations, and soliton dynamics.
