Download or read book ETUDE DE LA DIFFUSION DE LA CHALEUR EN AVAL D UN CYLINDRE CHAUFFE A FAIBLE NOMBRE DE REYNOLS 40 written by Laurence Hamma and published by . This book was released on 1988 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE EXPERIMENTALE. ON UTILISE LE CHAUFFAGE DU CYLINDRE POUR MODIFIER LES PROPRIETES DU FLUIDE ET CONTROLER AINSI LE PHENOMENE TOURBILLONNAIRE. ANALYSE DU CHAMP THERMIQUE. LA TEMPERATURE EFFECTIVE CONTROLANT LE DEVELOPPEMENT DE LA DOUBLE ALLEE DE VON KARMAN EST TRES INFERIEURE A LA TEMPERATURE DE FILM. ETUDE DU COUPLAGE ENTRE UN ECOULEMENT AMONT TURBULENT ET LE SILLAGE EN AVAL DU CYLINDRE

Download or read book ETUDE EXPERIMENTALE DE LA DIFFUSION DE LA CHALEUR EN AVAL D UNE SOURCE LINEAIRE PLACEE DANS UNE ALLEE DE BENARD VON KARMAN written by FRANCK.. WEISS and published by . This book was released on 1999 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EXPERIMENTAL CONCERNE L'ETUDE DE LA DIFFUSION DE LA CHALEUR EN AVAL D'UNE SOURCE LINEAIRE CONTINUE PLACEE DANS LE PROCHE SILLAGE D'UN CYLINDRE CIRCULAIRE GENERANT UNE ALLEE DE TOURBILLONS DE BENARD-VON KARMAN. CES RESULTATS EXPERIMENTAUX PRESENTENT LES CHAMPS DE VITESSE ET DE TEMPERATURE POUR PLUSIEURS POSITIONS DE SOURCE SUR ET EN DEHORS DE LA LIGNE CENTRALE DU SILLAGE. CES CHAMPS ONT ETE MESURES SIMULTANEMENT OU SUCCESSIVEMENT AU MOYEN DE LA VDL A DEUX COMPOSANTES ET D'UN FIL FROID SUR DES DISTANCES EN AVAL DE LA SOURCE CORRESPONDANT AU CHAMP PROCHE. L'UTILISATION SIMULTANEE DE LA VDL ET D'UN FIL FROID NOUS A CONDUIT A ETUDIER LES EFFETS DE CONTAMINATION DU FIL FROID PAR LA PRESENCE DE PARTICULES SUR SA SURFACE. LA CONTAMINATION EST LE FAIT D'UN NOMBRE CONSTANT DE GOUTTES DONT LE DIAMETRE AUGMENTE AVEC LE TEMPS D'EXPOSITION. LA FONCTION DE TRANSFERT DU FIL FROID DECROIT DANS UNE GAMME DE FREQUENCES CARACTERISTIQUES DE L'INVERSE DE LA CONSTANTE DE TEMPS DES GOUTTES. CE TRAVAIL A PERMIS EGALEMENT DE RESOUDRE LE PROBLEME DU CHOIX DE LA SOURCE AFIN D'EVITER L'APPARITION DE PHENOMENES DE CONTROLE. L'ETUDE A ETE MENEE PRINCIPALEMENT A UN NOMBRE DE REYNOLDS RE = RE C + 15, AVEC UNE SOURCE DE CHALEUR 100 FOIS PLUS PETITE EN DIAMETRE QUE LE CYLINDRE PRINCIPAL, PLACEE A UNE SECTION SITUEE A 5D. SELON LES POSITIONS DE SOURCE Y S, LES PROCESSUS DE DIFFUSION ET DE MELANGE EVOLUENT VERS UNE SITUATION ASYMPTOTIQUE OU LA CHALEUR MARQUE L'ENSEMBLE DU SILLAGE LOINTAIN. LES CARACTERISTIQUES LAGRANGIENNES DE L'ECOULEMENT MONTRENT EN PARTICULIER UNE CROISSANCE INITIALEMENT LINEAIRE DE LA VARIANCE. LA MODELISATION DU MOMENT V' PAR UNE DIFFUSION PAR GRADIENT N'EST PAS PROBANTE MAIS PERMET DE RETROUVER DES DIFFUSIVITES ENVIRON SIX FOIS PLUS ELEVEES QUE LA DIFFUSIVITE MOLECULAIRE. CES VALEURS SONT COMPRISES ENTRE CELLES QUI RESULTERAIENT DES EFFETS D'UN TOURBILLON OU D'UN ETIREMENT PUR. UN NOMBRE DE PRANDTL PROPRE A L'ALLEE DE BVK EST EGALEMENT DEFINI.

Download or read book Contribution l tude du transfert convectif entre un cylindre chauff et un coulement d air puls charg de gouttelettes d eau written by Christian Basilico (auteur d'une thèse de sciences.) and published by . This book was released on 1979 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etude exp rimentale des champs dynamiques et thermiques de l coulement de Benard Von Karman en aval d un obstacle chauff dans l air et dans l eau written by Fabien Dumouchel and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse a pour objet l'étude expérimentale de l'écoulement en aval d'un obstacle chauffé ou non (cylindre circulaire ou ruban) dans une gamme de nombres de Reynolds où le sillage 2D-périodique est caractérisé par l'existence d'une allée de Benard-Von Karman. Cette étude a été entreprise dans l'air et dans l'eau, en utilisant l'ADL pour la mesure des vitesses et la thermométrie à fil froid ou à thermocouple à fil fin pour la mesure des températures. Des études antérieures ont montré que ce type d'écoulement était très sensible au chauffage de l'obstacle, conduisant à une stabilisation dans le cas des gaz et à une déstabilisation dans le cas des liquides. L'objectif principal de cette étude a été de prendre en compte l'influence du chauffage sur le régime de l'écoulement quand ce contrôle thermique est uniquement dû aux modifications des propriétés physiques du fluide. Après une étude du champ de vitesse en aval d'un obstacle non chauffé, la même étude est entreprise dans le cas où l'obstacle est chauffé. Pour appréhender l'effet du chauffage sur le régime d'écoulement, les notions de température effective et de nombre de Reynolds effectif re#e#f#f ont été développées. L'ensemble des résultats obtenus dans l'air et dans l'eau montre que les caractéristiques de l'écoulement sont similaires dans des situations ou les re#e#f#f sont identiques, pour des valeurs différentes des vitesses amonts et du chauffage. L'utilisation de re#e#f#f permet également de comparer les champs thermiques dans l'air et dans l'eau. L'effet du nombre de Prandtl se traduit par des largeurs initiales des sillages thermiques beaucoup plus faibles dans l'eau que dans l'air et des écarts de température moyenne et des intensités des fluctuations de température beaucoup plus élevées dans l'eau que dans l'air. En revanche le nombre de Nusselt de l'obstacle chauffé dépend d'un nombre de Reynolds intermédiaire entre re#f#i#l#m et re#e#f#f

Download or read book Contribution l tude du champ thermique en aval de deux cylindres de diam tres diff rents written by Raphaël Mangouala and published by . This book was released on 1981 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE SPECTRALE EN AVAL D'UN BARREAU CYLINDRIQUE CHAUFFE. COMPARAISON DU CHAMP DE FLUCTUATIONS THERMIQUES AU CHAMP DE FLUCTUATIONS DYNAMIQUES. ETUDE DE LA DIFFUSION D'UN CONTAMINANT PASSIF (TEMPERATURE) AU SEIN D'UN ECOULEMENT TURBULENT CISAILLE DISSYMETRIQUE (MELANGE DE SILLAGES EN AVAL D'UN COUPLE DE BARREAUX DE DIAMETRES DIFFERENTS DONT L'UN EST CHAUFFE). L'ETUDE COMPREND LE TRAITEMENT NUMERIQUE ET L'ANALYSE CONDITIONNELLE DES SIGNAUX REPRESENTANT LES FLUCTUATIONS DES COMPOSANTES LONGITUDINALES ET TRANSVERSALES DE VITESSE AINSI QUE DE TEMPERATURE

Download or read book Etude exp rimentale de la diffusion de la chaleur en aval d une source lin aire plac e dans une couche limite turbulente written by Pierre Paranthoën and published by . This book was released on 1978 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Waves and Pattern Dynamics written by Nizar Abcha and published by Springer. This book was released on 2018-04-20 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the fascinating phenomena associated with nonlinear waves and spatio-temporal patterns. These appear almost everywhere in nature from sand bed forms to brain patterns, and yet their understanding still presents fundamental scientific challenges. The reader will learn here, in particular, about the current state-of-the art and new results in: Nonlinear water waves: resonance, solitons, focusing, Bose-Einstein condensation, as well as and their relevance for the sea environment (sea-wind interaction, sand bed forms, fiber clustering) Pattern formation in non-equilibrium media: soap films, chimera patterns in oscillating media, viscoelastic Couette-Taylor flow, flow in the wake behind a heated cylinder, other pattern formation. The editors and authors dedicate this book to the memory of Alexander Ezersky, Professor of Fluid Mechanics at the University of Caen Normandie (France) from September 2007 to July 2016. Before 2007, he had served as a Senior Scientist at the Institute of Applied Physics of the Russian Academy of Sciences in Nizhny Novgorod (Russia). The chapters have been written by leading scientists in Nonlinear Physics, and the topics chosen so as to cover all the fields to which Prof. Ezersky himself contributed, by means of experimental, theoretical and numerical approaches. The volume will appeal to advanced students and researchers studying nonlinear waves and pattern dynamics, as well as other scientists interested in their applications in various natural media.

Download or read book Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.

Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.

Download or read book Methods of Detecting Exoplanets written by Valerio Bozza and published by Springer. This book was released on 2016-04-12 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, renowned scientists describe the various techniques used to detect and characterize extrasolar planets, or exoplanets, with a view to unveiling the “tricks of the trade” of planet detection to a wider community. The radial velocity method, transit method, microlensing method, and direct imaging method are all clearly explained, drawing attention to their advantages and limitations and highlighting the complementary roles that they can play in improving the characterization of exoplanets’ physical and orbital properties. By probing the planetary frequency at different distances and in different conditions, these techniques are helping astrophysicists to reconstruct the scenarios of planetary formation and to give robust scientific answers to questions regarding the frequency of potentially habitable worlds. Twenty years have passed since the discovery of a Jupiter-mass companion to a main sequence star other than the Sun, heralding the birth of extrasolar planetary research; this book fully conveys the exciting progress that has been achieved during the intervening period.

Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Review of Research on Laterites written by Roger Maignien and published by . This book was released on 1966 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background, definition and scope of the problem; Morphological and analytical characteristics of laterites; Global distribution of laterites; Origin of laterites; Classification of laterites.

Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.

Download or read book The Astronomical Revolution written by Alexandre Koyre and published by Routledge. This book was released on 2013-04-15 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in English in 1973. This volume traces the development of the revolution which so drastically altered man’s view of the universe in the sixteenth and seventeenth centuries. The "astronomical revolution" was accomplished in three stages, each linked with the work of one man. With Copernicus, the sun became the centre of the universe. With Kepler, celestial dynamics replaced the kinematics of circles and spheres used by Copernicus. With Borelli the unification of celestial and terrestrial physics was completed by abandonment of the circle in favour the straight line to infinity.

Download or read book Compendium of Sanitation Systems and Technologies written by Elizabeth Tilley and published by . This book was released on 2014 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.