Download or read book VAPORISATION ET OXYDATION A HAUTE TEMPERATURE ET HAUTE PRESSION DE GOUTTES DE COMBUSTIBLES LIQUIDES written by CELINE.. MORIN and published by . This book was released on 1999 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA VAPORISATION ET L'OXYDATION DE GOUTTES DE COMBUSTIBLES LIQUIDES SONT DES MECANISMES FONDAMENTAUX DANS LA COMBUSTION DE BROUILLARDS. L'OBJECTIF DE CETTE THESE EST DE CARACTERISER CES DEUX PROCESSUS QUE L'ON RETROUVE DANS DE NOMBREUX SYSTEMES ENERGETIQUES, COMME LES MOTEURS DIESEL, LES TURBOREACTEURS OU LES BRULEURS INDUSTRIELS. L'ACCENT EST MIS SUR L'ETUDE DE L'INFLUENCE DES DEUX PARAMETRES, TEMPERATURE - PRESSION. DEUX TYPES DE COMBUSTIBLES LIQUIDES SONT ETUDIES : DES N-ALCANES, FAMILLE CHIMIQUE COMPOSANT MAJORITAIREMENT LE GAZOLE ET DES ESTERS METHYLIQUES D'HUILES VEGETALES, CARBURANTS DE SUBSTITUTION UTILISES DANS LES MOTEURS DIESEL. NOUS PRESENTONS TOUT D'ABORD L'INFLUENCE DE LA TEMPERATURE SEULE SUR LA VAPORISATION DE GOUTTES DE N-ALCANES (DU N-C 5H 1 2 AU N-C 1 0H 2 2) PUIS CELLE DES PARAMETRES COMBINES, TEMPERATURE - PRESSION SUR LA VAPORISATION DE GOUTTES DE N-HEPTANE ET N-DECANE. A PARTIR D'UN SYSTEME D'ACQUISITION D'IMAGES PAR CAMERA VIDEO, DES CARACTERISTIQUES DE VAPORISATION SONT DETERMINEES, COMME LES TAUX MOYENS ET INSTANTANES DE VAPORISATION, LES TEMPS DE CHAUFFAGE ET DE VAPORISATION. NOUS NOUS ATTACHONS EN PARTICULIER A PRECISER L'INFLUENCE DE LA TEMPERATURE ET DE LA PRESSION AU REGARD DES PARAMETRES CRITIQUES DU COMBUSTIBLE LIQUIDE. LES TAUX MOYENS DE VAPORISATION SONT COMPARES A CEUX CALCULES ANALYTIQUEMENT A PARTIR DE LA THEORIE QUASI-STATIONNAIRE. DES MODIFICATIONS SONT APPORTEES A CE MODELE, AVEC PRISE EN COMPTE DE L'INFLUENCE DE LA CONVECTION NATURELLE ET DE LA PERIODE DE CHAUFFAGE. NOUS COMPARONS LES CARACTERISTIQUES DE VAPORISATION DES GOUTTES DE N-ALCANES AVEC CELLES D'ESTERS METHYLIQUES D'HUILES VEGETALES. ENFIN, NOUS IDENTIFIONS LES ESPECES CHIMIQUES FORMEES LORS DE LA PYROLYSE ET L'OXYDATION DE CES BIOCARBURANTS PAR CHROMATOGRAPHIE EN PHASE GAZEUSE - SPECTROMETRIE DE MASSE. A PARTIR DES EXPERIENCES D'OXYDATION REALISEES EN REACTEUR AUTO-AGITE, NOUS DEGAGEONS LES EFFETS DE TEMPERATURE, PRESSION ET RICHESSE SUR LA FORMATION DE POLLUANTS.

Download or read book Sciences de la mati re et microgravit written by Dominique Langevin and published by . This book was released on 2001 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etude de la vaporisation combustion des gouttes d oxyg ne liquide LOX haute pression written by Joe͏̈l Daou and published by . This book was released on 1994 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS ETUDIONS LA VAPORISATION-COMBUSTION DES GOUTTES D'OXYGENE LIQUIDE (LOX) EN REGIME TRANSCRITIQUE ET SUPERCRITIQUE, DANS DES CONDITIONS THERMODYNAMIQUES TYPIQUES DES MOTEURS-FUSEES. APRES UNE BREVE SYNTHESE DE RESULTATS THEORIQUES IMPORTANTS (CHAPITRE I), NOUS PRESENTONS AU CHAPITRE II LE CAS DE LA COMBUSTION SUPERCRITIQUE D'UNE GOUTTE LOX AVEC UN SCHEMA REACTIONNEL DETAILLE. LA FLAMME DE DIFFUSION OBTENUE EST TRES EPAISSE, ESSENTIELLEMENT A CAUSE DE LA REVERSIBILITE DES REACTIONS, ET LE TAUX MAXIMAL DE DEGAGEMENT DE CHALEUR SE PRODUIT DANS LA PROXIMITE DE L'INTERFACE. LE PROBLEME DE L'ALLUMAGE EST ABORDE ET UNE ETUDE PARAMETRIQUE EXHAUSTIVE EST FAITE. EN PARTICULIER, LE TEMPS DE COMBUSTION EST TROUVE INDEPENDANT DE LA PRESSION. DANS LE CHAPITRE III, NOUS ETUDIONS LA NATURE DES FRONTS CHIMIQUES INTERVENANT LOCALEMENT DANS LE PROCESSUS D'ALLUMAGE D'UNE GOUTTE LOX. LES RESULTATS MONTRENT LA POSSIBILITE D'EXISTENCE DE DEFLAGRATIONS RAPIDES, AVEC UNE STRUCTURE ORIGINALE DANS DES MELANGES O#2-H#2 A HAUTE TEMPERATURE (1500 K). DANS LE CHAPITRE IV, NOUS PRESENTONS LA MODELISATION THERMODYNAMIQUE DE L'INTERFACE UTILISE, BASEE SUR L'UTILISATION DES EQUATIONS D'ETAT CUBIQUES. CETTE APPROCHE THERMODYNAMIQUE SUGGERE LA DISPARITION DE L'INTERFACE EN PRESENCE DE TRACES DE H#2O. LE CHAPITRE V EST CONSACRE AU PROBLEME DE VAPORISATION PURE, ET UTILISE LES INGREDIENTS DU CHAPITRE PRECEDENT. LE REGIME DE VAPORISATION SOUS-CRITIQUE SE PROLONGE JUSQU'A ENVIRON DEUX FOIS LA PRESSION CRITIQUE DE O#2. LA TRANSITION VERS LE REGIME DE VAPORISATION SUPERCRITIQUE EST EXPRIMEE COMME UNE RELATION ENTRE LA PRESSION ET LA TEMPERATURE DE CHAMBRE. ENFIN LE CHAPITRE VI PRESENTE LE DEBUT D'UNE ETUDE BIDIMENSIONNELLE. IL DECRIT BRIEVEMENT LE CODE NUMERIQUE AXISYMMETRIQUE MIS AU POINT. IL EST DU TYPE VOLUMES FINIS AVEC GRILLES DECALEES ET UTILISE UNE METHODE MULTIGRILLE POUR LA RESOLUTION DES GRANDS SYSTEMES. DES RESULTATS QUALITATIFS CORRESPONDANT AU PROBLEME DE LA DEFORMATION D'UNE GOUTTE SUPERCRITIQUE INJECTEE DANS UN MILIEU CHAUD SONT PRESENTES

Download or read book VAPORISATION ET COMBUSTION DE GOUTTES ISOLEES DE COMBUSTIBLES LIQUIDES INFLUENCE DE LA PRESSION written by XAVIER.. CHESNEAU and published by . This book was released on 1994 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PORTE SUR LA COMBUSTION ET LA VAPORISATION DE GOUTTES ISOLEES DE COMBUSTIBLES LIQUIDES. CETTE ETUDE S'EST EFFECTUEE DANS DIVERSES CONDITIONS DYNAMIQUES ET THERMODYNAMIQUES. EN EFFET, LE PREMIER AXE DE CE TRAVAIL CONCERNE L'ETUDE DE LA COMBUSTION DES GOUTTES LORSQUE LA VITESSE RELATIVE ENTRE LA GOUTTE ET L'ECOULEMENT DEVIENT NON NEGLIGEABLE. LE DEUXIEME AXE CONCERNE L'ETUDE DE LA COMBUSTION ET DE LA VAPORISATION DES GOUTTES DANS UN MILIEU STAGNANT A HAUTE PRESSION, TOUT EN MINIMISANT LES EFFETS DE LA GRAVITE. LA RECHERCHE REALISEE TOUT AU LONG DE CE TRAVAIL A ETE ESSENTIELLEMENT EXPERIMENTALE. LES CARACTERISTIQUES DE COMBUSTION, OU DE VAPORISATION D'UNE GOUTTE DE COMBUSTIBLE LIQUIDE PEUVENT ETRE DEDUITES EXPERIMENTALEMENT A PARTIR DE L'EVOLUTION EN FONCTION DU TEMPS DE SON DIAMETRE ET DE CELUI DE LA FLAMME QUI L'ENTOURE. POUR CELA, NOUS AVONS DONC ADOPTE UNE MESURE AUTOMATIQUE DE LA SURFACE PROJETEE DE LA GOUTTE A L'AIDE DE CAMERAS ET D'UNE CHAINE DE DIGITALISATION ET DE TRAITEMENT D'IMAGES. DE PLUS POUR MINIMISER LES EFFETS DE LA CONVECTION NATURELLE SUR LA COMBUSTION D'UNE GOUTTE DE COMBUSTIBLE LIQUIDE, NOUS AVONS UTILISE LA TECHNIQUE DES VOLS PARABOLIQUES D'UN AVION LABORATOIRE. DANS LE CADRE DE L'ETUDE DE L'INFLUENCE DE LA CONVECTION FORCEE, PLUSIEURS REGIMES DE COMBUSTION DE GOUTTES ISOLEE ONT ETE IDENTIFIES. POUR CHAQUE REGIME LA CONSTANTE DE VAPORISATION EN COMBUSTION A ETE DETERMINEE. DE PLUS LES TRANSITIONS ENTRE CES DIFFERENTS REGIMES ONT ETE CARACTERISEES. EN CE QUI CONCERNE L'INFLUENCE DE LA PRESSION SUR LA VAPORISATION ET LA COMBUSTION DES GOUTTES, NOUS AVONS REALISE DES EXPERIENCES JUSQU'A DES PRESSIONS SUPERIEURES AUX PRESSIONS CRITIQUES DES DIFFERENTS COMBUSTIBLES ETUDIES. L'INFLUENCE DE LA PRESSION SUR LE TAUX DE COMBUSTION A ETE MISE EN EVIDENCE. DE NOMBREUSES COMPARAISONS ONT ETE FAITES AVEC LA THEORIE QUASI-STATIONNAIRE, AINSI QU'AVEC D'AUTRES ETUDES EXPERIMENTALES

Download or read book tude exp rimentale de l vaporation haute temp rature de gouttes de combustible en r gime de fortes interactions l aide de m thodes optiques written by Lionel Perrin and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude des transferts de chaleur et de masse lors de l'évaporation de gouttes en mouvement et en interaction est un domaine complexe à cause des nombreux phénomènes en jeu. Les principaux paramètres influençant l'évaporation ont pu être étudiés indépendamment grâce à l'utilisation de diagnostics optiques de mesure non-intrusifs sur un train de gouttes monodisperse. Une technique basée sur la fluorescence induite par laser (LIF) à deux couleurs a été développée afin d'obtenir la température moyenne de gouttes de combustible mono et multicomposant. Afin de supprimer l'effet optique parasite engendré par des résonances morphologiquement dépendantes, un absorbeur non fluorescent a été ensemencé à faible concentration. L'évolution de la vitesse et de la taille des gouttes ont été investiguées grâce à une technique par ombroscopie quantitative qui permis la mesure très précise des taux d'évaporation. Une enceinte à haute température a été conçue afin de générer des conditions ambiantes maitrisées et propices à la formation d'une forte évaporation. Ainsi, les nombres de Nusselt et Sherwood ont été déterminés expérimentalement pour plusieurs combustibles dans diverses conditions d'injection. L'étude sur différents combustibles et à différentes températures d'injection a confirmé l'influence de la volatilité du combustible sur les transferts. L'influence du nombre de Reynolds a aussi été mise en évidence. L'étude de gouttes multicomposant a permis de montrer différentes phases d'échauffement et d'évaporation lors du temps de transit de la goutte liées aux différences de volatilité des combustibles du mélange. Les effets de différentes compositions ont aussi été investigués.

Download or read book Etude num rique et exp rimentale de l vaporation simultan e de plusieurs gouttes de carburant written by Mohamed Bouaziz and published by . This book was released on 1998 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF DE CE TRAVAIL EST DE POURSUIVRE LA MISE AU POINT D'UN MODELE NUMERIQUE INITIE AU L.M.A.I. POUR SIMULER LE PHENOMENE D'EVAPORATION D'UNE OU PLUSIEURS GOUTTES EN INTERACTION FORMEES DE LIQUIDES PURS OU DE MELANGES. LA THEORIE DU FILM EST UTILISEE POUR LA MODELISATION DES TRANSFERTS AU SEIN DE LA PHASE GAZEUSE ET LES EQUATIONS DE TRANSFERTS DE CHALEUR ET DE MASSE POUR LA MODELISATION DES CHAMPS THERMIQUES ET MASSIQUES DANS LA GOUTTE. LA DETERMINATION NECESSAIRE DES EXPRESSIONS DONNANT LES NOMBRES DE NUSSELT ET DE SHERWOOD QUI TRADUISENT CES TRANSFERTS, SE FAIT GRACE A LA RESOLUTION DES EQUATIONS DE LA COUCHE LIMITE. LE PHENOMENE D'INTERACTION ENTRE GOUTTES EN EVAPORATION PEUT SE TRADUIRE PAR L'AJUSTEMENT DE LA VALEUR DES NOMBRES DE NUSSELT ET DE SHERWOOD MOYENS. LE DISPOSITIF EXPERIMENTAL ELABORE EN PARALLELE, SE COMPOSE ESSENTIELLEMENT D'UNE SOUFFLERIE THERMIQUE CAPABLE DE CREER LES CONDITIONS EXPERIMENTALES (TEMPERATURE ET VITESSE) REQUISES, ET D'UN APPAREILLAGE DE MESURES (CAMERA VIDEO : MESURE DE LA REGRESSION DU RAYON ET CAMERA INFRAROUGE : MESURE DE LA TEMPERATURE DE SURFACE). LA OU LES GOUTTES DE LIQUIDES PURS OU EN MELANGES (HEPTANE, DECANE, HEXANE, OCTANE) SONT SUSPENDUES A DES CAPILLAIRES EN VERRE. LE MODELE NUMERIQUE EST VALIDE PAR RAPPORT AUX RESULTATS DE LA LITTERATURE PUIS PAR RAPPORT AUX PRESENTS RESULTATS EXPERIMENTAUX. LA COMPARAISON EST SATISFAISANTE ET MONTRE LA CAPACITE DU MODELE A PREDIRE L'EVAPORATION D'UNE GOUTTE DE LIQUIDE PUR OU DE MELANGE DE CARBURANTS A BASSES ET A HAUTES PRESSIONS, ISOLEES OU EN INTERACTION. L'ORIGINALITE DU TRAVAIL RESIDE DANS L'ELABORATION D'UNE METHODE SEMI-EXPERIMENTALE POUR LA QUALIFICATION ET LE DEPOUILLEMENT DES MESURES EN CONVECTION FORCEE ET POUR LA DETERMINATION DES VALEURS DE L'EMISSIVITE DES PRODUITS UTILISES.

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 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 French English Medical Dictionary written by Alfred Gordon and published by . This book was released on 1921 with total page 180 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 Finite Volumes for Complex Applications IX Methods Theoretical Aspects Examples written by Robert Klöfkorn and published by Springer Nature. This book was released on 2020-06-09 with total page 727 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of the 9th conference on "Finite Volumes for Complex Applications" (Bergen, June 2020) are structured in two volumes. The first volume collects the focused invited papers, as well as the reviewed contributions from internationally leading researchers in the field of analysis of finite volume and related methods. Topics covered include convergence and stability analysis, as well as investigations of these methods from the point of view of compatibility with physical principles. Altogether, a rather comprehensive overview is given on the state of the art in the field. The properties of the methods considered in the conference give them distinguished advantages for a number of applications. These include fluid dynamics, magnetohydrodynamics, structural analysis, nuclear physics, semiconductor theory, carbon capture utilization and storage, geothermal energy and further topics. The second volume covers reviewed contributions reporting successful applications of finite volume and related methods in these fields. The finite volume method in its various forms is a space discretization technique for partial differential equations based on the fundamental physical principle of conservation. Many finite volume methods preserve further qualitative or asymptotic properties, including maximum principles, dissipativity, monotone decay of free energy, and asymptotic stability, making the finite volume methods compatible discretization methods, which preserve qualitative properties of continuous problems at the discrete level. This structural approach to the discretization of partial differential equations becomes particularly important for multiphysics and multiscale applications. The book is a valuable resource for researchers, PhD and master’s level students in numerical analysis, scientific computing and related fields such as partial differential equations, as well as engineers working in numerical modeling and simulations.

Download or read book Analytical Methods in the Nuclear Fuel Cycle written by and published by . This book was released on 1972 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A German English Dictionary for Chemists written by Austin M 1876-1956 Patterson and published by Scholar Select. This book was released on 2015-08-08 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Dictionary of Civil Engineering written by Jean-Paul Kurtz and published by Springer Science & Business Media. This book was released on 2004-09-14 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt: I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.

Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.

Download or read book Building an Emergency Plan written by and published by Getty Publications. This book was released on 2000-02-03 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building an Emergency Plan provides a step-by-step guide that a cultural institution can follow to develop its own emergency preparedness and response strategy. This workbook is divided into three parts that address the three groups generally responsible for developing and implementing emergency procedures—institution directors, emergency preparedness managers, and departmental team leaders—and discuss the role each should play in devising and maintaining an effective emergency plan. Several chapters detail the practical aspects of communication, training, and forming teams to handle the safety of staff and visitors, collections, buildings, and records. Emergencies covered include natural events such as earthquakes or floods, as well as human-caused emergencies, such as fires that occur during renovation. Examples from the Barbados Museum and Historical Society, the Museo de Arte Popular Americano in Chile, the Mystic Seaport Museum in Connecticut, and the Seattle Art Museum show how cultural institutions have prepared for emergencies relevant to their sites, collections, and regions.

Download or read book Biodiesel Production written by Biodiesel Production Technologies Challenges and Future Prospects Task Committee and published by . This book was released on 2019 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biodiesel Production: Technologies, Challenges, and Future Prospects provides in-depth information on fundamentals, approaches, technologies, source materials and associated socio-economic and political impacts of biodiesel production.