Download or read book tude exp rimentale d un coulement turbulent non cisaill soumis un gradient thermique written by Pascal Roches and published by . This book was released on 2000 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le pré-traitement statistique utilisé pour simplifier le modèle mathématique complet des écoulements turbulents à masse volumique variable peut être effectué de différentes manières. Des études antérieures, portant sur ce sujet, ont mis en évidence le rôle central des flux turbulents de masse au niveau des différences qui résultent de l'utilisation de la moyenne de Favre ou de la moyenne centrée. Le but de ce travail est donc d'améliorer, par l'observation, la compréhension des mécanismes régissant les écoulements turbulents à masse volumique variable. Nous avons donc défini une configuration expérimentale amplifiant les effets de densité au détriment de ceux de la dynamique. La mesure des flux turbulents de masse nécessite l'acquisition simultanée de la vitesse et de la température à une fréquence élevée. Un examen de la métrologie actuelle nous a aidé à choisir le système de mesure adéquat pour atteindre nos objectifs. Le dépouillement de nos résultats nous a permis de mettre en évidence les mécanismes liant les effets de densité à ceux de la dynamique de l'écoulement. Plus particulièrement, nous avons montré que l'influence des flux turbulents de masse sur le comportement des écoulements compressibles est négligeable.
Download or read book Etude exp rimentale d un coulement turbulent soumis une compression written by Emmanuel HAMELIN and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book tude exp rimentale et num rique d un coulement de paroi d c l r en turbulence pleinement d velopp e written by Laurence Brunet-Lartaud and published by . This book was released on 1997 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PRESENTE ETUDE A ETE ENTREPRISE AFIN DE MIEUX COMPRENDRE LA DEFAILLANCE DES MODELES DE TURBULENCE A EQUATIONS DE TRANSPORT DANS LE CAS D'ECOULEMENT PARIETAUX A FORT GRADIENT DE PRESSION DEFAVORABLE. POUR CELA, UNE EXPERIENCE A ETE IMAGINEE DANS LAQUELLE UN ECOULEMENT DE CANAL PLAN ETABLI EST SOUMIS A UNE FORTE DECELERATION AU TRAVERS D'UN DIFFUSEUR PLAN ASYMETRIQUE. LA DIFFERENCE ESSENTIELLE ENTRE CETTE CONFIGURATION ET LE CAS, PLUS SOUVENT ETUDIE, DE COUCHE LIMITE DECELEREE RESIDE DANS LA STRUCTURE DE LA ZONE EXTERNE QUI EST PLEINEMENT TURBULENTE DANS NOTRE CAS ET INTERMITTENTE POUR UNE COUCHE LIMITE. LA COMPARAISON AVEC LES RESULTATS DE CALCUL ISSUS DU MODELE (, ) EST PRESENTEE, AVEC L'INTENTION DE MONTRER QUE L'HYPOTHESE SELON LAQUELLE LA DEFICIENCE CONNUE DU MODELE EN ZONE EXTERNE POURRAIT-ETRE RELIEE A LA PRESENCE DU PHENOMENE D'INTERMITTENCE. LES RESULTATS OBTENUS SEMBLENT INDIQUER QUE LES PREDICTIONS D'UN ECOULEMENT DE PAROI EN TURBULENCE PLEINEMENT DEVELOPPEE NE PRESENTENT PAS LES DEFAILLANCES OBSERVEES EN COUCHE LIMITE DECELEREE. LE COEFFICIENT DE FROTTEMENT, LES EPAISSEURS CARACTERISTIQUES, LES PROFILS DE VITESSE DEFICITAIRE ET LES PROFILS DES GRANDEURS TURBULENTES SONT EN BON ACCORD AVEC L'EXPERIENCE. EN CONSEQUENCE, EN LES SENSIBILISANT AU PHENOMENE D'INTERMITTENCE, ON EST AMENE A PENSER QUE LA REPONSE DES MODELES POURRAIT-ETRE AMELIOREE.
Download or read book Etude numerique et experimentale d un ecoulement turbulent complexe written by Patrick B.. Spitz and published by . This book was released on 1980 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: etude d'une couche limite bidimensionnelle se developpant sur un cylindre dont l'axe est parallele a la direction de la vitesse exterieure. a une position ou l'ecoulement est pleinement developpe une partie du cylindre est mise en rotation, creant ainsi des effets tridimensionnels qui peuvent etre importants. mesures de pression et de vitesse moyenne dans la sous-couche a proximite de la paroi. determination des coefficients de frottement et mesures de turbulence. analyse numerique a l'aide d'un schema de longueur de melange modifie
Download or read book Genmix written by D Brian Spalding and published by Elsevier. This book was released on 2014-05-18 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genmix: A General Computer Program for Two-dimensional Parabolic Phenomena explains a computer program called GENMIX. The main intention of the program is to be used as a tool of instructions. The name of the program is a mixture of two considerations: its generality and its concern for mixing processes. The book aims to help the potential user to understand the physical and mathematical basis of the topic computer program. It is also the aim of the book to make the program applicable to practical problems. The book is arranged in such a way as to parallel a course of lectures and associated computer-workshop sessions wherein the student is allowed to do some elementary computations as soon as he has gained some knowledge of the method. The book contains the mathematical, physical, and computer-coding aspects of the program. Concepts such as the boundary layer, two-dimensional, and steady- flow are defined and discussed in depth. The text will be a useful tool for computer instructors and students.
Download or read book IUTAM Symposium on Variable Density Low Speed Turbulent Flows written by Louis Fulachier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: The General Assembly of the International Union of Theoretical and Applied Mechanics in its meeting on August 28, 1994, selected for 1996 only four Mechanics Symposia, of which ours is the only one related to Fluid Mechanics: Variable Density Low Speed Turbulent Flows. This IUTAM Symposium, organized by the Institut de Recherche sur les Phenomenes Hors Equilibre (Marseille), is the logical continuation of the meetings previously organized or co-organized - on the French or European level, such as Euromech 237, Marseille, 1988 - by the same research group ofMarseille. This meeting focused specifically on the structure of turbulent flows in which density varies strongly : the effect of this variation on the velocity and scalar fields is in no sense negligible. We were mainly concerned with low-speed flows subjected to strong local changes of density as a consequence of heat or mass transfer or of chemical reactions. Compressible turbulent flows - such a!" supersonic ones - were also considered in order to underline their similarities to and their differences from low-speed variable density flows.
Download or read book Heat and Mass Transfer in Boundary Layers written by Suhas V. Patankar and published by . This book was released on 1970 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Mechanics of Porous Media written by Philippe Charlez and published by CRC Press. This book was released on 1995-01-01 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the lecture notes of the 1994 Mechanics of Porous Media Summer School. Chapters cover theoretical basics, methods for measuring poroelastic coefficients, numerical implementation and applications.
Download or read book Convective Mass Transfer written by Dudley Brian Spalding and published by . This book was released on 1963 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat and Mass Transfer in Recirculating Flows written by A. D. Gosman and published by . This book was released on 1969 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculations in Furnace Technology written by Clive Davies and published by Elsevier. This book was released on 2016-05-13 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculations in Furnace Technology presents the theoretical and practical aspects of furnace technology. This book provides information pertinent to the development, application, and efficiency of furnace technology. Organized into eight chapters, this book begins with an overview of the exothermic reactions that occur when carbon, hydrogen, and sulfur are burned to release the energy available in the fuel. This text then evaluates the efficiencies to measure the quantity of fuel used, of flue gases leaving the plant, of air entering, and the heat lost to the surroundings. Other chapters consider that it is important to determine the amount of carbon discharged with the ashes, the quantity and composition of any tar produced, so that a carbon balance can be applied. The final chapter describes the various reactions within the furnace atmosphere and between charges and atmosphere. This book is a valuable resource for fuel technologists, heating and ventilating engineers, and plant operators.
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 Evaluated Kinetic Data for High Temperature Reactions written by and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Emissions from Continuous Combustion Systems written by W. Cornelius and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the proceedings of the Symposium on Emissions from Continuous Combustion Systems that was held at the General Motors Research Laboratories, Warren, Michigan on September 27 and 28, 1971. This symposium was the fifteenth in an annual series presented by the Research Laboratories. Each symposium has covered a different technical discipline. To be selected as the theme of a symposium, the subject must be timely and of vital interest to General Motors as well as to the technical community at large. For each symposium, the practice is to solicit papers at the forefront of research from recognized authorities in the technical discipline of interest. Approximately sixty scientists and engineers from academic, government and industrial circles in this country and abroad are then invited to join about an equal number of General Motors technical personnel to discuss freely the commissioned papers. The technical portion of the meeting is supplemented by social functions at which ample time is afforded for informal exchanges of ideas amongst the participants. By such a direct interaction of a small and select group of informed participants, it is hoped to extend the boundaries of research in the selected technical field.
Download or read book Physical Chemistry of Fast Reactions written by Bryan Philip Levitt and published by Springer Science & Business Media. This book was released on 1973 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combustor Modelling written by and published by . This book was released on 1980 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
