Download or read book tude Num rique de la Convection Naturelle dans une Chemin e Solaire written by Tahar Tayebi and published by Editions Universitaires Europeennes. This book was released on 2014-06-30 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une etude numerique de la convection naturelle laminaire de l'air dans une cheminee solaire a ete abordee. Le fluide vehicule est considere comme un fluide newtonien et incompressible, en utilisant l'approximation de Boussinesq et la formulation vorticite-fonction de courant en coordonnees hyperboliques. Nous avons pris comme conditions de chauffage des parois isothermes pour notre collecteur (Tc pour le sol et Tf pour le toit). La resolution de ces equations est basee sur un schema de discretisation aux volumes finis. Nous avons examine l'effet de la geometrie du systeme sur le phenomene de la convection naturelle dans la cheminee. Finalement, les resultats de la simulation ont ete donnes sous forme, de champs de temperature et de vitesse."
Download or read book Etude num rique de la convection naturelle dans une chaudi re solaire written by Patrick Le Quéré and published by . This book was released on 1980 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: MODELE NUMERIQUE DE LA CHAUDIERE. ETUDE DE LA DISCRETISATION SPATIALE. MISE EN OEUVRE PRATIQUE. RESULTATS: VERIFICATION DE L'HYPOTHESE DE BOUSSINESQ; OBTENTION DE RESULTATS A NOMBRE DE GRASHOF ELEVE; EFFETS DE L'INCLINAISON DE LA CAVITE; PERTES THERMIQUES DE LA CAVITE.
Download or read book SIMULATION NUMERIQUE ET EXPERIMENTALE DU CHAUFFAGE D UN LOCAL PAR ENERGIE SOLAIRE written by MOHAMED JOMAA.. SAFI and published by . This book was released on 1980 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE EXPERIMENTALE SUR UNE MAQUETTE AU 1/10E DU CHAUFFAGE D'UN LOCAL PAR CONVECTION NATURELLE D'AIR PRODUIT PAR UN COLLECTEUR INTEGRE. CONSTRUCTION D'UN MODELE NUMERIQUE DU CHAUFFAGE ET COMPARAISON DES DONNEES EXPERIMENTALES ET DES CALCULS
Download or read book Mod lisation de la convection naturelle haute temp rature application l tude des transferts dans un r acteur solaire written by Boubakar Savadogo and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CE TRAVAIL EST D'ETUDIER LES PHENOMENES DE CONVECTION NATURELLE A HAUTE TEMPERATURE DANS UN REACTEUR SOLAIRE. UNE METHODE NUMERIQUE RECURSIVE A ETE DEVELOPPEE POUR RESOUDRE LE SYSTEME D'EQUATIONS NON-LINEAIRES DECRIVANT LA CONVECTION NATURELLE A HAUTE TEMPERATURE (T3000K). CETTE METHODE NUMERIQUE PERMET DE PRENDRE EN COMPTE AVEC AISANCE LA VARIABILITE DE TOUTES LES PROPRIETES PHYSIQUES DU FLUIDE (AIR, ARGON, AZOTE) EN FONCTION DE LA TEMPERATURE. ELLE PERMET EGALEMENT D'AFFINER LA VALIDITE DES RESULTATS EN CONSIDERANT UN NOMBRE IMPORTANT DES MAILLES SANS AUGMENTER CONSIDERABLEMENT LE TEMPS DE CALCUL PAR RAPPORT AUX METHODES ITERATIVES USUELLES. LES PROFILS DE TEMPERATURE ET DE VITESSES OBTENUS NOUS ONT PERMIS DE DEDUIRE UNE RELATION SIMPLE DONNANT LE NOMBRE DE NUSSELT EN FONCTION DU NOMBRE DE GRASHOF ET/OU DU NOMBRE DE RAYLEIGH. COMME TRES PEU DE DONNEES SONT DISPONIBLES DANS LA BIBLIOGRAPHIE SUR LA CONVECTION NATURELLE A HAUTE TEMPERATURE, NOUS AVONS APPLIQUE NOTRE METHODE RECURSIVE AUX PHENOMENES DE CONVECTION LIBRE A DES TEMPERATURES INFERIEURES (T1500K) AFIN DE LA VALIDITE. DANS CE DOMAINE DE TEMPERATURE, L'APPROXIMATION DE BOUSSINESQ EST GENERALEMENT ADOPTEE PAR DE NOMBREUX AUTEURS. LES RESULTATS OBTENUS SONT EN BON ACCORD. LE COUPLAGE DES RESULTATS DE CE TRAVAIL ET DE CEUX DEJA OBTENUS SONT AU SEIN DE L'IMP/CNRS D'ODEILLO, PERMETTRA DANS UNE PREMIERE PHASE DE CARACTERISER LES PROCESSUS DE VAPORISATION ET DE VAPOCONDENSATION DANS LES REACTEURS SOLAIRES. UN DES DOMAINES D'APPLICATION EST NOTAMMENT LA SIMULATION DES PROCEDES SOLAIRE OU LASER DE TRAITEMENT ET DE SYNTHESE DE MATERIAUX TELS QUE LES NANO-POUDRES OU LES NANO-TUBES.
Download or read book Etude de la convection naturelle et de la stratification thermique dans une cavit inclin e et chauff e au milieu written by Marie Swiatek and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La réglementation thermique sur les bâtiments en France impose le recours aux énergies renouvelables. L'énergie solaire, à la fois thermique et photovoltaïque, présente un grand potentiel en termes de disponibilité. Néanmoins, du fait de son caractère intermittent, des systèmes de stockage associés sont nécessaires. Pour ce qui est des systèmes solaires thermiques, les capteurs solaires intégrant le stockage (CSIS) ont pour avantages une grande simplicité ainsi que des coûts réduits comparés à des systèmes plus classiques. Ils permettent également d'éviter la problématique de la mise en place du stockage, les rendant ainsi adaptés à la rénovation énergétique.Le présent travail de thèse étudie les phénomènes de convection naturelle dans une cavité fermée à haut rapport de forme (H/L = 13) représentant le réservoir de stockage d'un CSIS. Dans un premier temps, un état de l'art des systèmes existants ainsi qu'une étude bibliographique de l'étude de ces systèmes et des phénomènes s'y déroulant sont réalisés. Il y est mis en évidence l'importance de la stratification des températures au sein du réservoir pour l'amélioration des performances globales du système. Dans un second temps, une étude expérimentale de la cavité est effectuée pour la compréhension des écoulements liés à la mise en place d'une stratification thermique satisfaisante, ainsi que des paramètres pouvant l'influencer. Dans cette étude, une plaque de stratification est ajoutée à l'intérieur de la cavité pour canaliser le fluide chaud ascendant, limitant ainsi le brassage. La zone de chauffe représentant l'échange entre la boucle solaire et le réservoir est placée au milieu de la face supérieure du système, résultant en une bonne stratification. Un écoulement inverse est observé au niveau de la sortie de ce canal. Ce phénomène est principalement responsable de l'écart de température obtenu entre le haut et le bas du système. Une étude numérique CFD du système a donc été conduite pour étudier l'influence de différents paramètres sur le comportement thermique et de l'écoulement. La diminution de l'écoulement inverse permet une meilleure circulation du fluide dans la globalité du système. Afin de déterminer si la stratification thermique observée dans le système de stockage conduit à une performance énergétique annuelle satisfaisante du capteur auto-stockeur, une modélisation nodale a été effectuée. Différents paramètres tels que la position de la zone d'échange entre le collecteur et le réservoir de stockage, ou encore l'épaisseur de l'isolant ont été étudiés pour quantifier leur influence sur les performances du système complet.
Download or read book Bulletin de l Institut international du froid written by and published by . This book was released on 2002 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Download or read book El Ni o written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Download or read book Dew Water written by Daniel Beysens and published by CRC Press. This book was released on 2022-09-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world’s ever-increasing need for fresh water has led to the use of non-conventional sources such as rain and fog water collection. Although rain water collection is relatively simple, the supply is often erratic. Passive fog water collection has been used in several parts of the world but is only relevant to certain geographical locations. Dew occurrence, however, is far more widespread, can form in most climates and geographic settings, show high frequency and prevalence throughout the year. During the past 20 years, dew collection has therefore been investigated as a serious supplemental source of fresh water. Dew Water offers a thorough review of dew, its formation characteristics and potential for dew collection, for audiences that include policy-makers, non-governmental organizations involved in development aid and sustainable development, engineers, urban planners, researchers and students.After providing a background on atmospheric water, humid air, and sky and materials emissivity, the book deals with dew formation and its estimation with a focus on the use of meteorological data. Dew measurement techniques are reviewed and discussed as well as dew collection by passive means. Computational fluid dynamics technique is described for better design of dew collectors. Dew quality (chemistry, biology) is assessed in view of potable water quality. Costs and economic aspects are also considered.
Download or read book Boundary Layer Theory written by Hermann Schlichting (Deceased) and published by Springer. This book was released on 2016-10-04 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.
Download or read book Long Term Climatic Variations written by Jean-Claude Duplessy and published by Springer. This book was released on 2011-11-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate is the most important component of the Earth's environment and climatic fluctuations have a strong impact on water supplies, vegetation, energy use etc. Thus our understanding of the climatic system is of utmost importance. Leading experts in the field of climate modelling and paleoclimatology present the most recent methods for reconstructing past climatic variations and for modelling the climatic system and its evolution. The first of three parts is devoted to the climatic system and the physical basis for its modelling; the second summarizes the evolution of the global atmosphere, the ocean, the continents, the biosphere, and the ice sheets during recent climatic cycles; the last part focusses on the understanding of past and future climatic changes.
Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Download or read book In Vessel Melt Retention and Ex Vessel Corium Cooling IAEA Tecdoc No 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Download or read book Hydrology of Mediterranean and Semiarid Regions written by Eric Servat and published by . This book was released on 2003 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Download or read book Supplementary volume Edited by I Todhunter written by George Boole and published by . This book was released on 1865 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
