Contribution à l'étude de la structure de la turbulence en présence de forts gradients de température PDF Download

Author: Abdellatif Chakir
Publisher:
ISBN:
Category :
Languages : fr
Pages : 146

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Etude de l'influence de forts gradients de température sur la strucure de la turbulence. Les écoulements étudiés sont des jets annulaires verticaux obtenus à la sortie d'un brûleur. Dans la partie centrale, deux types de flamme, flamme turbulente et flamme laminaire pemettent de chauffer l'écoulement annulaire. On écrit les équations statistiques de continuité, de quantité de mouvement et d'enthalpie. Les mesures sont effectuées par anémothermométrie à fil chaud. déterminations des spectres de température, des tensions de Reynolds et des densités de flux de chaleur turbulent. On en déduit les coefficients de diffusivité cinématique et thermique de la turbulence ainsi que le nombre de Prandtl de la turbulence.

Author: El Mahjoub Bahraoui
Publisher:
ISBN:
Category :
Languages : fr
Pages : 506

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ETUDE DES EFFETS DE FORTS GRADIENTS DE TEMPERATURE SUR LA STRUCTURE DE LA TURBULENCE D'UN JET ANNULAIRE CHAUFFE PAR DEUX FLAMMES DE NATURE DIFFERENTE. CAS OU L'ECOULEMENT EST LEGEREMENT CHAUFFE SANS FLAMME, LA CHALEUR SE COMPORTANT COMME UN CONTAMINANT PASSIF ET CAS OU L'ECOULEMENT EST FORTEMENT CHAUFFE

Author:
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 728

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Author:
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 1290

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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Author: Fabien Anselmet
Publisher: John Wiley & Sons
ISBN: 1119178398
Category : Technology & Engineering
Languages : en
Pages : 529

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This didactic book presents the main elements of acoustics, aeroacoustics and vibrations. Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or environmental problems. Theoretical approaches enable us to analyze the different processes in play. Typical results, mostly from numerical simulations, are used to illustrate the main phenomena (fluid acoustics, radiation, diffraction, vibroacoustics, etc.).

Author: Katja Matthes
Publisher:
ISBN: 9782759818495
Category : Business & Economics
Languages : en
Pages : 0

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For centuries, scientists have been fascinated by the role of the Sun in the Earth's climate system. Recent discoveries, outlined in this book, have gradually unveiled a complex picture, in which our variable Sun affects the climate variability via a number of subtle pathways, the implications of which are only now becoming clear. This handbook provides the scientifically curious, from undergraduate students to policy makers with a complete and accessible panorama of our present understanding of the Sun-climate connection. 61 experts from different communities have contributed to it, which reflects the highly multidisciplinary nature of this topic. The handbook is organised as a mosaic of short chapters, each of which addresses a specific aspect, and can be read independently. The reader will learn about the assumptions, the data, the models, and the unknowns behind each mechanism by which solar variability may impact climate variability. None of these mechanisms can adequately explain global warming observed since the 1950s. However, several of them do impact climate variability, in particular on a regional level. This handbook aims at addressing these issues in a factual way, and thereby challenge the reader to sharpen his/her critical thinking in a debate that is frequently distorted by unfounded claims.

Author:
Publisher:
ISBN:
Category : Astrophysics
Languages : en
Pages : 260

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Author: C. David Andereck
Publisher: Springer Science & Business Media
ISBN: 1461534380
Category : Science
Languages : en
Pages : 351

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Seldom does a physical system, particularly one as apparently simple as the flow of a Newtonian fluid between concentric rotating cylinders, retain the interest of scientists, applied mathematicians and engineers for very long. Yet, as this volume goes to press it has been nearly 70 years since G. I. Taylor's outstanding experimental and theoretical study of the linear stability of this flow was published, and a century since the first experiments were performed on rotating cylinder viscometers. Since then, the study of this system has progressed enormously, but new features of the flow patterns are still being uncovered. Interesting variations on the basic system abound. Connections with open flows are being made. More complex fluids are used in some experiments. The vigor of the research going on in this particular example of nonequilibrium systems was very apparent at the NATO Advanced Research Workshop on "Ordered and Turbulent Patterns in Taylor Couette Flow," held in Columbus, Ohio, USA May 22-24, 1991. A primary goal of this ARW was to bring together those interested in pattern formation in the classic Taylor Couette problem with those looking at variations on the basic system and with those interested in related systems, in order to better define the interesting areas for the future, the open questions, and the features common (and not common) to closed and open systems. This volume contains many of the contributions presented during the workshop.

Author: C. David Whiteman
Publisher: Oxford University Press
ISBN: 0199881065
Category : Science
Languages : en
Pages : 372

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Book Description
Mountain Meteorology: Fundamentals and Applications offers first an introduction to the basic principles and concepts of mountain meteorology, then goes on to discuss their application in natural resources management. It includes over two hundred beautiful, full-color photographs, figures, and diagrams, as well as observable indicators of atmospheric processes--such as winds, temperature, and clouds--to facilitate the recognition of weather systems and events for a variety of readers. It is ideal for those who spend time in or near mountains and whose daily activities are affected by weather. As a comprehensive work filled with diverse examples and colorful illustrations, it is essential for professionals, scholars, and students of meteorology.

Author: Abraham Lerman
Publisher: Springer Science & Business Media
ISBN: 3642851320
Category : Science
Languages : en
Pages : 345

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Book Description
A lake, as a body of water, is in continuous interaction with the rocks and soils in its drainage basin, the atmosphere, and surface and groundwaters. Human industrial and agricultural activities introduce new inputs and processes into lake systems. This volume is a selection of ten contributions dealing with diverse aspects of lake systems, including such subjects as the geological controls of lake basins and their histories, mixing and circulation patterns in lakes, gaseous exchange between the water and atmosphere, and human input to lakes through atmospheric precipitation and surficial runoff. This work was written with a dual goal in mind: to serve as a textbook and to provide professionals with in-depth expositions and discussions of the more important aspects of lake systems.