Etude De Latomisation Flash Dun Jet Deau

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Étude expérimentale de l'atomisation assistée de jets diphasiques gaz-liquide

Author : Jean-Christophe Guillard
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (115 download)

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Book Synopsis Étude expérimentale de l'atomisation assistée de jets diphasiques gaz-liquide by : Jean-Christophe Guillard

Download or read book Étude expérimentale de l'atomisation assistée de jets diphasiques gaz-liquide written by Jean-Christophe Guillard and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'atomisation assistée d'une phase liquide lente par un co-courant gazeux rapide est un sujet largement étudié dans la littérature, et des avancées notables sont intervenues notamment sur les mécanismes de brisure, la structure du jet atomisé ainsi que sur les caractéristiques des gouttes formées. En revanche, peu d'études traitent d'une configuration où la phase lente consiste en un jet diphasique gaz-liquide. Cette situation se rencontre par exemple lors du transitoire d'allumage des moteurs cryotechniques de fusée durant lequel la fraction volumique de gaz passe continument de 1 (jet interne purement gazeux) à 0 (jet interne purement liquide), de sorte que pratiquement tous les régimes d'écoulements diphasiques, allant du régime à bulles jusqu'aux écoulements annulaires, peuvent être observés.L'objectif est donc de comprendre comment la fraction volumique de gaz et/ou le régime d'écoulement diphasique du jet interne impactent les modes d'atomisation et in fine les caractéristiques du spray.Pour répondre à ces questions, des expérimentations ont été menées avec comme fluides de substitution de l'air et de l'eau en conditions ambiantes et sous gravité terrestre. Les trois paramètres de contrôle principaux sont la vitesse superficielle du liquide qui a été variée de 0,17 m/s à 2 m/s, la vitesse superficielle du gaz dans le jet interne qui a été fixée de telle sorte que la fraction de débit gaz balaye la plage 0 à 0,99 et enfin la vitesse du gaz externe qui a évolué entre de 20 à 200 m/s. Trois géométries d'injecteurs axisymétriques ont été utilisées pour d'une part accéder à tous les régimes d'écoulements diphasiques souhaités excepté l'écoulement à brouillard, et d'autre part pour varier le diamètre du jet central d'un facteur d'environ deux. Deux types de campagnes expérimentales ont été réalisées : une campagne à rapport des pressions dynamiques gaz-liquide fixé à 16 pour des fractions de débit volumique gaz variables, ainsi que des campagnes à fractions de débit volumique gaz fixe et M variable .Les caractéristiques structurelles du spray, sa longueur de brisure et l'angle du spray formé ont été mesurés par imagerie rapide alors que les caractéristiques de la phase dispersée, c'est-à-dire tailles, vitesses et flux de gouttes ont été mesurés par sonde optique.Les cartographies des régimes d'écoulements dans l'injecteur et des structures du jet diphasique avec et sans assistance par le gaz externe que nous avons établies ont permis de démontrer que ces structures étaient étroitement liées au régime d'écoulement du jet central. Trois modes d'atomisation principaux ont été identifiés et leur frontières établies. A faible fraction de débit gaz, l'atomisation de jets liquides chargés en petites bulles est sujet à l'épluchage de surface et aux battements latéraux à grande échelle comme sur un jet monophasique liquide. A très grande fraction de débit gaz, l'écoulement annulaire donne lieu à l'atomisation d'une nappe annulaire. Pour des valeurs intermédiaires, de nouvelles structures de type "parapluie" se forment à l'arrivée des bouchons de gaz caractérisées par une grande amplitude et un développement orthogonal au jet. L'atomisation des écoulements à régimes « churn » et annulaire donne lieu à des sprays à caractère intermittent du fait de passage de blocs liquides issus de l'écoulement interne.La longueur de brisure est réduite par l'ajout de gaz interne jusqu'à devenir très petite pour les fractions de débit gaz élevées. Le comportement de l'angle du spray est différent selon le diamètre du jet atomisé et le régime d'écoulement interne : il peut augmenter ou réduire selon la configuration.Les pdf centrées sur la taille goutte moyenne sont peu sensibles à la fraction de débit gaz. En revanche les tailles de gouttes moyennes et le flux volumique montrent des évolutions marquées : ils peuvent selon la fraction de débit gaz et donc selon la structure du jet atomisé réduire ou augmenter.

Contribution à l'étude de l'atomisation assistée d'un liquide

Author : Sylvain Marty
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (95 download)

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Book Synopsis Contribution à l'étude de l'atomisation assistée d'un liquide by : Sylvain Marty

Download or read book Contribution à l'étude de l'atomisation assistée d'un liquide written by Sylvain Marty and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'atomisation assistée est un procédé de formation d'un spray de gouttelettes issu d'une nappe liquide sous l'action d'un courant gazeux à forte vitesse dans un injecteur. Ce procédé est très utilisé dans de nombreuses applications industrielles. Nous étudions la succession d'instabilités hydrodynamiques qui génère les gouttes du spray à l'aide d'une méthode LIF pour mesurer la fréquence des vagues et d'une sonde optique pour la granulométrie des gouttes. Nous validons expérimentalement un nouveau modèle de stabilité linéaire inviscide pour l'instabilité de cisaillement, intégrant un profil de vitesse avec déficit à l'injection. Des simulations numériques et un modèle spatio-temporel de stabilité linéaire sont utilisés pour mettre en avant de nouveaux mécanismes de déstabilisation, de croissance des vagues et de création de gouttes. Les lois d'échelles connues prédictives du diamètre moyen des gouttes en fonction du Weber gaz sont testées pour de nouvelles variables d'étude.

Atomisation assistée par un cisaillement de l'écoulement gazeux. Développement et validation

Author : Geoffroy Vaudor
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (932 download)

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Book Synopsis Atomisation assistée par un cisaillement de l'écoulement gazeux. Développement et validation by : Geoffroy Vaudor

Download or read book Atomisation assistée par un cisaillement de l'écoulement gazeux. Développement et validation written by Geoffroy Vaudor and published by . This book was released on 2015 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'atomisation assistée permet de transformer un jet liquide en gouttes à l'aide d'un jet gazeux co-courant rapide. Ce procédé est mis en œuvre dans certains moteurs cryotechniques et systèmes de propulsion aéronautique. L'étude numérique de ces configurations est cependant difficile à réaliser en raison du fort cisaillement couplé au fort rapport de masse volumique entre les phases liquide et gazeuse qui rendent la plupart des solveurs instables dont le solveur ARCHER développé au CORIA. Des développements numériques sur la modélisation des termes convectifs, à partir des travaux de Rudman, ont été réalisés. L'idée conductrice est de rétablir la consistance entre le transport numérique de la masse et celui de la quantité de mouvement. La discrétisation proposée nécessite le transport de l'interface sur une grille duale. Cette méthode s'est avérée stable mais coûteuse numériquement. Une nouvelle discrétisation, permettant de s'affranchir de la seconde grille est proposée et validée sur différents cas tests. Des études expérimentales sur l'atomisation assistée ont été menées au laboratoire LEGI depuis de nombreuses années et les nouveaux schémas numériques implémentés au cours de ce travail ont permis la simulation numérique d'un film liquide cisaillé 2D et d'un jet coaxial liquide en 3D que l'on a comparés aux résultats expérimentaux.

Fluid Dynamics and Transport of Droplets and Sprays

Author : W. A. Sirignano
Publisher : Cambridge University Press
ISBN 13 : 0521884896
Total Pages : 481 pages
Book Rating : 4.5/5 (218 download)

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Book Synopsis Fluid Dynamics and Transport of Droplets and Sprays by : W. A. Sirignano

Download or read book Fluid Dynamics and Transport of Droplets and Sprays written by W. A. Sirignano and published by Cambridge University Press. This book was released on 2010-01-11 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.

Soil Analysis

Author : J. Gautheyrou
Publisher : CRC Press
ISBN 13 : 9789054107163
Total Pages : 514 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Soil Analysis by : J. Gautheyrou

Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.

Ocean of Sound

Author : David Toop
Publisher :
ISBN 13 :
Total Pages : 328 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Ocean of Sound by : David Toop

Download or read book Ocean of Sound written by David Toop and published by . This book was released on 1995 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Ocean of Sound" begins in 1889 at the Paris Exposition when Debussy first heard Javanese music performed. A culture absorbed in perfume, light and ambient sound developed in response to the intangibility of 20th century communications. David Toop traces the evolution of this culture, through Erik Satie to the Velvet Undergound; Miles Davis to Jimi Hendrix. David Toop, who lives in London, is a writer, musician and recording artist. His other books are "Rap Attack 3 "and "Exotica,"

Energy Efficiency in Mobility Systems

Author : Shaharin Anwar Sulaiman
Publisher : Springer Nature
ISBN 13 : 9811501025
Total Pages : 210 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis Energy Efficiency in Mobility Systems by : Shaharin Anwar Sulaiman

Download or read book Energy Efficiency in Mobility Systems written by Shaharin Anwar Sulaiman and published by Springer Nature. This book was released on 2019-10-03 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights a diverse range of initiatives that have been launched to attain sustainable mobility systems, in particular regarding the energy efficiency aspect. It offers a valuable reference for various stakeholders in transportation systems, while also sharing new ideas on how transportation can meet the challenges of tomorrow.

Dictionary of Building and Civil Engineering

Author : Don Montague
Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)

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Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague

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.

EPA 570/9

Author :
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis EPA 570/9 by :

Download or read book EPA 570/9 written by and published by . This book was released on 1982-10 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Turn Down the Heat

Author : A Report for the World Bank by the Potsdam Institute for Climate Impact Research and Analytics.
Publisher : World Bank Publications
ISBN 13 : 1464800553
Total Pages : 253 pages
Book Rating : 4.4/5 (648 download)

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Book Synopsis Turn Down the Heat by : A Report for the World Bank by the Potsdam Institute for Climate Impact Research and Analytics.

Download or read book Turn Down the Heat written by A Report for the World Bank by the Potsdam Institute for Climate Impact Research and Analytics. and published by World Bank Publications. This book was released on 2013-06-19 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report focuses on the risks of climate change to development in Sub-Saharan Africa, South East Asia and South Asia. Building on the 2012 report, Turn Down the Heat: Why a 4°C Warmer World Must be Avoided, this new scientific analysis examines the likely impacts of present day, 2°C and 4°C warming on agricultural production, water resources, and coastal vulnerability. It finds many significant climate and development impacts are already being felt in some regions, and that as warming increases from present day (0.8°C) to 2°C and 4°C, multiple threats of increasing extreme heat waves, sea-level rise, more severe storms, droughts and floods are expected to have further severe negative implications for the poorest and most vulnerable. The report finds that agricultural yields will be affected across the three regions, with repercussions for food security, economic growth, and poverty reduction. In addition, urban areas have been identified as new clusters of vulnerability with urban dwellers, particularly the urban poor, facing significant vulnerability to climate change. In Sub-Saharan Africa, under 3°C global warming, savannas are projected to decrease from their current levels to approximately one-seventh of total land area and threaten pastoral livelihoods. Under 4°C warming, total hyper-arid and arid areas are projected to expand by 10 percent. In South East Asia, under 2°C warming, heat extremes that are virtually absent today would cover nearly 60-70 percent of total land area in northern-hemisphere summer, adversely impacting ecosystems. Under 4°C warming, rural populations would face mounting pressures from sea-level rise, increased tropical cyclone intensity, storm surges, saltwater intrusions, and loss of marine ecosystem services. In South Asia, the potential sudden onset of disturbances to the monsoon system and rising peak temperatures would put water and food resources at severe risk. Well before 2°C warming occurs, substantial reductions in the frequency of low snow years is projected to cause substantial reductions in dry season flow, threatening agriculture. Many of the worst climate impacts could still be avoided by holding warming below 2°C, but the window for action is closing rapidly. Urgent action is also needed to build resilience to a rapidly warming world that will pose significant risks to agriculture, water resources, coastal infrastructure, and human health.

The Role of Green Chemistry in Biomass Processing and Conversion

Author : Haibo Xie
Publisher : John Wiley & Sons
ISBN 13 : 111844941X
Total Pages : 424 pages
Book Rating : 4.1/5 (184 download)

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Book Synopsis The Role of Green Chemistry in Biomass Processing and Conversion by : Haibo Xie

Download or read book The Role of Green Chemistry in Biomass Processing and Conversion written by Haibo Xie and published by John Wiley & Sons. This book was released on 2012-11-21 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sets the stage for the development of sustainable, environmentally friendly fuels, chemicals, and materials Taking millions of years to form, fossil fuels are nonrenewable resources; it is estimated that they will be depleted by the end of this century. Moreover, the production and use of fossil fuels have resulted in considerable environmental harm. The generation of environmentally friendly energy from renewable sources such as biomass is therefore essential. This book focuses on the integration of green chemistry concepts into biomass processes and conversion in order to take full advantage of the potential of biomass to replace nonsustainable resources and meet global needs for fuel as well as other chemicals and materials. The Role of Green Chemistry in Biomass Processing and Conversion features contributions from leading experts from Asia, Europe, and North America. Focusing on lignocellulosic biomass, the most abundant biomass resource, the book begins with a general introduction to biomass and biorefineries and then provides an update on the latest advances in green chemistry that support biomass processing and conversion. Next, the authors describe current and emerging biomass processing and conversion techniques that use green chemistry technologies, including: Green solvents such as ionic liquids, supercritical CO2, and water Sustainable energy sources such as microwave irradiation and sonification Green catalytic technologies Advanced membrane separation technologies The last chapter of the book explores the ecotoxicological and environmental effects of converting and using fuels, chemicals, and materials from biomass. Recommended for professionals and students in chemical engineering, green chemistry, and energy and fuels, The Role of Green Chemistry in Biomass Processing and Conversion sets a strong foundation for the development of a competitive and sustainable bioeconomy. This monograph includes a Foreword by James Clark (University of York, UK).

Antifascisms

Author : David Ward
Publisher : Fairleigh Dickinson Univ Press
ISBN 13 : 9780838636763
Total Pages : 260 pages
Book Rating : 4.6/5 (367 download)

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Book Synopsis Antifascisms by : David Ward

Download or read book Antifascisms written by David Ward and published by Fairleigh Dickinson Univ Press. This book was released on 1996 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an in-depth analysis of three of the most crucial years in twentieth-century Italian history, the years 1943-46. After more than two decades of a Fascist regime and a disastrous war experience during which Italy changed sides, these years saw the laying of the political and cultural foundations for what has since become known as Italy's First Republic. Drawing on texts from the literature, film, journalism, and political debate of the period, Antifascisms offers a thorough survey of the personalities and positions that informed the decisions taken in this crucial phase of modern Italian history.

Corrosion Guide

Author : E. Rabald
Publisher : Elsevier
ISBN 13 : 0444600051
Total Pages : 937 pages
Book Rating : 4.4/5 (446 download)

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Book Synopsis Corrosion Guide by : E. Rabald

Download or read book Corrosion Guide written by E. Rabald and published by Elsevier. This book was released on 2012-12-02 with total page 937 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion Guide presents a list of corrosive agents and the trade names of materials, including metallic and non-metallic materials as well as alloys. The book provides guidance in using the tabulated information. This reference also lists relevant publications that deal with the properties of various materials. This new edition provides more data that are not included in the previous edition. The former edition fails to present enough information as the provided properties of the corrosive agents varies and other data are not available. The release aims to minimize missing information about the subject matter. This compilation of tabulated data provides description of each group of corrosive agents. Elements and compounds under each group are listed, along with their properties such as room temperature, corrosion rate, and composition. The list of trade names of materials also describes the composition of each material. The information contained in this book is intended to help practicing engineers deal with corrosion.

The Nimonic Alloys, and Other Nickel-base High-temperature Alloys

Author : J. Heslop
Publisher :
ISBN 13 :
Total Pages : 518 pages
Book Rating : 4.:/5 (41 download)

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Book Synopsis The Nimonic Alloys, and Other Nickel-base High-temperature Alloys by : J. Heslop

Download or read book The Nimonic Alloys, and Other Nickel-base High-temperature Alloys written by J. Heslop and published by . This book was released on 1974 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Liquid Biofuels

Author : Krushna Prasad Shadangi
Publisher : John Wiley & Sons
ISBN 13 : 1119791987
Total Pages : 754 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Liquid Biofuels by : Krushna Prasad Shadangi

Download or read book Liquid Biofuels written by Krushna Prasad Shadangi and published by John Wiley & Sons. This book was released on 2021-06-29 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiled by a well-known expert in the field, Liquid Biofuels provides a profound knowledge to researchers about biofuel technologies, selection of raw materials, conversion of various biomass to biofuel pathways, selection of suitable methods of conversion, design of equipment, selection of operating parameters, determination of chemical kinetics, reaction mechanism, preparation of bio-catalyst: its application in bio-fuel industry and characterization techniques, use of nanotechnology in the production of biofuels from the root level to its application and many other exclusive topics for conducting research in this area. Written with the objective of offering both theoretical concepts and practical applications of those concepts, Liquid Biofuels can be both a first-time learning experience for the student facing these issues in a classroom and a valuable reference work for the veteran engineer or scientist. The description of the detailed characterization methodologies along with the precautions required during analysis are extremely important, as are the detailed description about the ultrasound assisted biodiesel production techniques, aviation biofuels and its characterization techniques, advance in algal biofuel techniques, pre-treatment of biomass for biofuel production, preparation and characterization of bio-catalyst, and various methods of optimization. The book offers a comparative study between the various liquid biofuels obtained from different methods of production and its engine performance and emission analysis so that one can get the utmost idea to find the better biofuel as an alternative fuel. Since the book covers almost all the field of liquid biofuel production techniques, it will provide advanced knowledge to the researcher for practical applications across the energy sector. A valuable reference for engineers, scientists, chemists, and students, this volume is applicable to many different fields, across many different industries, at all levels. It is a must-have for any library.

The Flagellants

Author : Carlene Hatcher Polite
Publisher : Macmillan
ISBN 13 : 0374526567
Total Pages : 226 pages
Book Rating : 4.3/5 (745 download)

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Book Synopsis The Flagellants by : Carlene Hatcher Polite

Download or read book The Flagellants written by Carlene Hatcher Polite and published by Macmillan. This book was released on 1967 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Flagellants is the story of the romantic relationship between Ideal and Jimson. After a brief prologue establishing Ideal's childhood connection to a black community called "the Bottom," the novel unfolds as a series of arguments between the couple, representing the historical gender conflicts between black men and women."--eNotes.

Experimental Aerodynamics

Author : Stefano Discetti
Publisher : CRC Press
ISBN 13 : 1498704026
Total Pages : 454 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis Experimental Aerodynamics by : Stefano Discetti

Download or read book Experimental Aerodynamics written by Stefano Discetti and published by CRC Press. This book was released on 2017-03-16 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Aerodynamics provides an up to date study of this key area of aeronautical engineering. The field has undergone significant evolution with the development of 3D techniques, data processing methods, and the conjugation of simultaneous measurements of multiple quantities. Written for undergraduate and graduate students in Aerospace Engineering, the text features chapters by leading experts, with a consistent structure, level, and pedagogical approach. Fundamentals of measurements and recent research developments are introduced, supported by numerous examples, illustrations, and problems. The text will also be of interest to those studying mechanical systems, such as wind turbines.