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Author: Arnaud Lizée
Publisher:
ISBN:
Category :
Languages : fr
Pages : 195
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Book Description
ON CONSIDERE UN FLUIDE EN CAVITE CARREE DIFFERENTIELLEMENT CHAUFFEE, SOUMIS A L'ACTION DE LA FORCE DE GRAVITE ET D'UNE FORCE DE VOLUME DUE A UN CHAMP VIBRATOIRE. POUR DE TRES GRANDES FREQUENCES DE VIBRATIONS, ON REALISE UNE ETUDE PARAMETRIQUE DE L'ECOULEMENT CONVECTIF, EN UTILISANT LES EQUATIONS MOYENNEES DE LA CONVECTION VIBRATIONNELLE. ON MET EN EVIDENCE L'EFFET DU NOMBRE DE RAYLEIGH VIBRATIONNEL ET DE LA DIRECTION DE L'AXE DES VIBRATIONS SUR LE CONTROLE DE LA CONVECTION NATURELLE. ON DONNE ALORS LE DOMAINE D'APPLICATION PHYSIQUE DE CES RESULTATS. UNE ETUDE COMPARATIVE DE CES RESULTATS, PAR SIMULATION DIRECTE DES EQUATIONS DE BOUSSINESQ PERMET DE DEGAGER UN CRITERE SUR LA FREQUENCE ADIMENSIONNELLE A PARTIR DE LAQUELLE L'EMPLOI DES EQUATIONS MOYENNEES EST JUSTIFIE. CETTE ETUDE EST REALISEE POUR UN NOMBRE DE PRANDTL DE 0,71 ET UN NOMBRE DE RAYLEIGH DE 10#4. ELLE MONTRE LES DIVERS REGIMES POSSIBLES POUR LA CONVECTION EN CAVITE CARREE EN FONCTION DE LA FREQUENCE DES VIBRATIONS. PAR AILLEURS, ON ETUDIE LA STABILITE LINEAIRE DE LA CONVECTION VIBRATIONNELLE, POUR UNE GEOMETRIE CYLINDRIQUE ; LE FLUIDE ETANT SOUMIS A L'ACTION D'UN FLUX DE CHALEUR INTERNE UNIFORMEMENT REPARTI. POUR CETTE ETUDE, ON EMPLOIE LA METHODE MATRICIELLE COUPLEE A LA METHODE DE GALERKIN. UNE COMPARAISON DE L'EMPLOI DE FONCTIONS DE BESSEL ET DE POLYNOMES EST REALISEE POUR LE CAS AXISYMETRIQUE
Author: Arnaud Lizée
Publisher:
ISBN:
Category :
Languages : fr
Pages : 195
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Book Description
ON CONSIDERE UN FLUIDE EN CAVITE CARREE DIFFERENTIELLEMENT CHAUFFEE, SOUMIS A L'ACTION DE LA FORCE DE GRAVITE ET D'UNE FORCE DE VOLUME DUE A UN CHAMP VIBRATOIRE. POUR DE TRES GRANDES FREQUENCES DE VIBRATIONS, ON REALISE UNE ETUDE PARAMETRIQUE DE L'ECOULEMENT CONVECTIF, EN UTILISANT LES EQUATIONS MOYENNEES DE LA CONVECTION VIBRATIONNELLE. ON MET EN EVIDENCE L'EFFET DU NOMBRE DE RAYLEIGH VIBRATIONNEL ET DE LA DIRECTION DE L'AXE DES VIBRATIONS SUR LE CONTROLE DE LA CONVECTION NATURELLE. ON DONNE ALORS LE DOMAINE D'APPLICATION PHYSIQUE DE CES RESULTATS. UNE ETUDE COMPARATIVE DE CES RESULTATS, PAR SIMULATION DIRECTE DES EQUATIONS DE BOUSSINESQ PERMET DE DEGAGER UN CRITERE SUR LA FREQUENCE ADIMENSIONNELLE A PARTIR DE LAQUELLE L'EMPLOI DES EQUATIONS MOYENNEES EST JUSTIFIE. CETTE ETUDE EST REALISEE POUR UN NOMBRE DE PRANDTL DE 0,71 ET UN NOMBRE DE RAYLEIGH DE 10#4. ELLE MONTRE LES DIVERS REGIMES POSSIBLES POUR LA CONVECTION EN CAVITE CARREE EN FONCTION DE LA FREQUENCE DES VIBRATIONS. PAR AILLEURS, ON ETUDIE LA STABILITE LINEAIRE DE LA CONVECTION VIBRATIONNELLE, POUR UNE GEOMETRIE CYLINDRIQUE ; LE FLUIDE ETANT SOUMIS A L'ACTION D'UN FLUX DE CHALEUR INTERNE UNIFORMEMENT REPARTI. POUR CETTE ETUDE, ON EMPLOIE LA METHODE MATRICIELLE COUPLEE A LA METHODE DE GALERKIN. UNE COMPARAISON DE L'EMPLOI DE FONCTIONS DE BESSEL ET DE POLYNOMES EST REALISEE POUR LE CAS AXISYMETRIQUE
Author: G. Z. Gershuni
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 382
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Book Description
Recent increasing awareness of the ways in which vibrational effects can affect low-gravity experiments have renewed interest in the study of thermal vibrational convection across a wide range of fields. For example, in applications where vibrational effects are used to provide active control of heat and mass transfer, such as in heat exchangers, stirrers, mineral separators and crystal growth, a sound understanding of the fundamental theory is required. In Thermal Vibrational Convection, the authors present the theory of vibrational effects caused by a static gravity field, and of fluid flows which appear under vibration in fluid-filled cavities. The first part of the book discusses fluid-filled cavities where the fluid motion only appears in the presence of temperature non-uniformities, while the second considers those situations where the vibrational effects are caused by a non-uniform field. Throughout, the authors concentrate on consideration of high frequency vibrations, where averaging methods can be successfully applied in the study of the phenomena. Written by two of the pioneers in this field, Thermal Vibrational Convection will be of great interest to scientists and engineers working in the many areas that are concerned with vibration, and its effect on heat and mass transfer. These include hydrodynamics, hydro-mechanics, low gravity physics and mechanics, and geophysics. The rigorous approach adopted in presenting the theory of this fascinating and highly topical area will facilitate a greater understanding of the phenomena involved, and will lead to the development of more and better-designed experiments.
Author:
Publisher:
ISBN:
Category : Chemical reactions
Languages : en
Pages : 442
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Book Description
Author: Shun-Hsyung Chang
Publisher: Springer Science & Business Media
ISBN: 3319037498
Category : Technology & Engineering
Languages : en
Pages : 378
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Book Description
Advanced materials are the basis of modern science and technology. This proceedings volume presents a broad spectrum of studies of novel materials covering their processing techniques, physics, mechanics, and applications. The book is concentrated on nanostructures, ferroelectric crystals, materials and composites, materials for solar cells and also polymeric composites. Nanotechnology approaches, modern piezoelectric techniques and also latest achievements in materials science, condensed matter physics, mechanics of deformable solids and numerical methods are presented. Great attention is devoted to novel devices with high accuracy, longevity and extended possibilities to work in wide temperature and pressure ranges, aggressive media etc. The characteristics of materials and composites with improved properties opening new possibilities of various physical processes, in particular transmission and receipt of signals under water, are described.
Author: Daniel Henry
Publisher:
ISBN:
Category : Computational methods
Languages : en
Pages : 298
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Book Description
Author: Vyacheslav M Ryaboy
Publisher: World Scientific
ISBN: 9811237352
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
Vibration presents a major challenge to advanced experiments and technological processes in engineering, physics and life sciences that rely on optics and optoelectronics. This compendium discusses ways in which vibration may affect optical performance and describes methods and means of reducing this impact. Principal methods of vibration control, namely, damping and isolation are highlighted using mathematical models and real-life examples.The unique text covers some topics that are important for optomechanical applications but are lacking in general vibration texts, such as dynamics and stability of elastically supported systems with high centers of gravity, physics of pneumatic isolators, and application of dynamic absorbers to vibration-isolated systems.This useful reference book enables the reader to apply the vibration control tools properly and perform basic analytical and experimental tasks of estimating and verifying their performance. It is also a must-have textbook for undergraduate or graduate-level courses in vibration control and optomechanics.Related Link(s)
Author: Joyce Ann Guzik
Publisher: Frontiers Media SA
ISBN: 2889711838
Category : Science
Languages : en
Pages : 269
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Book Description
Author: Eric Le Ru
Publisher: Elsevier
ISBN: 0080931553
Category : Science
Languages : en
Pages : 688
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Book Description
SERS was discovered in the 1970s and has since grown enormously in breadth, depth, and understanding. One of the major characteristics of SERS is its interdisciplinary nature: it lies at the boundary between physics, chemistry, colloid science, plasmonics, nanotechnology, and biology. By their very nature, it is impossible to find a textbook that will summarize the principles needed for SERS of these rather dissimilar and disconnected topics. Although a basic understanding of these topics is necessary for research projects in SERS with all its many aspects and applications, they are seldom touched upon as a coherent unit during most undergraduate studies in physics or chemistry. This book intends to fill this existing gap in the literature. It provides an overview of the underlying principles of SERS, from the fundamental understanding of the effect to its potential applications. It is aimed primarily at newcomers to the field, graduate students, researchers or scientists, attracted by the many applications of SERS and plasmonics or its basic science. The emphasis is on concepts and background material for SERS, such as Raman spectroscopy, the physics of plasmons, or colloid science, all of them introduced within the context of SERS, and from where the more specialized literature can be followed. - Represents one of very few books fully dedicated to the topic of surface-enhanced Raman spectroscopy (SERS) - Gives a comprehensive summary of the underlying physical concepts around SERS - Provides a detailed analysis of plasmons and plasmonics
Author:
Publisher:
ISBN:
Category : Astrophysics
Languages : fr
Pages : 950
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Author: Goddard Space Flight Center. Office of Public Affairs
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 366
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