CONTRIBUTION A L'ETUDE DE L'INFLUENCE DE LA MOLECULE DE CO#2 SUR UN PLASMA DE MELANGE AR-CO#2. ETUDE EXPERIMENTALE DE LA REPARTITION RADIALE DES TEMPERATURES DANS UN PLASMA AR-CO#2 PDF Download
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Author: ESSAADIA.. MAOUHOUB
Publisher:
ISBN:
Category :
Languages : fr
Pages : 152
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CE TRAVAIL COMPREND DEUX PARTIES ESSENTIELLES : UNE PARTIE THEORIQUE ET UNE PARTIE EXPERIMENTALE. LA PARTIE THEORIQUE EST CONSACREE A LA MISE AU POINT D'UN FORMALISME NUMERIQUE (METHODE DE NEWTON-RAPHSON) EN UTILISANT LES LOIS D'EQUILIBRE DE LA THERMODYNAMIQUE POUR LE CALCUL DE LA COMPOSITION ET LES PROPRIETES THERMODYNAMIQUES DES PLASMAS THERMIQUES. CE CALCUL A ETE APPLIQUE POUR DIFFERENTES VALEURS DE POURCENTAGES DE CO#2 AFIN DE METTRE EN EVIDENCE L'INFLUENCE DE CETTE MOLECULE SUR LES PROPRIETES THERMODYNAMIQUES DU PLASMA DU MELANGE AR-CO#2 A LA PRESSION ATMOSPHERIQUE. LA PARTIE EXPERIMENTALE CONSTITUE LA PARTIE PRINCIPALE ET ESSENTIELLE DE CE TRAVAIL. NOUS AVONS MIS AU POINT LA CHAMBRE A ARC STABILISE PAR PAROIS (TYPE MAECKER MODIFIE) AFIN DE DISPOSER D'UN ARC STABLE DANS LE TEMPS. LES METHODES DE DIAGNOSTIC DU PLASMA SONT BASEES SUR LA SPECTROSCOPIE D'EMISSION. DEUX METHODES D'INTERPOLATION (POLYNOME, SPLINE) POUR LE LISSAGE DES POINTS EXPERIMENTAUX SONT COMPAREES. LES PROFILS DE TEMPERATURES D'EXCITATION SONT DETERMINES A PARTIR DES RAIES ATOMIQUES (ARGON, CARBONE, OXYGENE) ET LES PROFILS DE TEMPERATURE DE ROTATION A PARTIR DES SPECTRES MOLECULAIRES OBSERVES, SYSTEME DE SWAN C#2 (0,0) ET SYSTEME VIOLET DE CN (0,0). LES PRINCIPAUX RESULTATS EXPERIMENTAUX OBTENUS MONTRENT QUE : - LA COMPOSITION LOCALE DU PLASMA N'EST PAS CELLE INJECTEE, - LA TEMPERATURE AUGMENTE EN FONCTION DU COURANT, - LE GRADIENT DE TEMPERATURE DIMINUE QUAND LE COURANT AUGMENTE, - LES FORMES DES PROFILS DES TEMPERATURES D'EXCITATION SONT MODIFIEES POUR LE PLASMA DU MELANGE AR-CO#2, - LE GRADIENT DE TEMPERATURE DIMINUE QUAND ON AUGMENTE LE POURCENTAGE DE CO#2, - LA FORMATION D'UN NOYAU A TEMPERATURE ELEVEE SUR L'AXE DE LA DECHARGE ET D'UN DEBUT DE PALIER ENTRE 7 000K ET 8 500K, - LES TEMPERATURES DE ROTATIONS SONT VRAISEMBLABLEMENT CELLES DE LA PERIPHERIE.
Author: ESSAADIA.. MAOUHOUB
Publisher:
ISBN:
Category :
Languages : fr
Pages : 152
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Book Description
CE TRAVAIL COMPREND DEUX PARTIES ESSENTIELLES : UNE PARTIE THEORIQUE ET UNE PARTIE EXPERIMENTALE. LA PARTIE THEORIQUE EST CONSACREE A LA MISE AU POINT D'UN FORMALISME NUMERIQUE (METHODE DE NEWTON-RAPHSON) EN UTILISANT LES LOIS D'EQUILIBRE DE LA THERMODYNAMIQUE POUR LE CALCUL DE LA COMPOSITION ET LES PROPRIETES THERMODYNAMIQUES DES PLASMAS THERMIQUES. CE CALCUL A ETE APPLIQUE POUR DIFFERENTES VALEURS DE POURCENTAGES DE CO#2 AFIN DE METTRE EN EVIDENCE L'INFLUENCE DE CETTE MOLECULE SUR LES PROPRIETES THERMODYNAMIQUES DU PLASMA DU MELANGE AR-CO#2 A LA PRESSION ATMOSPHERIQUE. LA PARTIE EXPERIMENTALE CONSTITUE LA PARTIE PRINCIPALE ET ESSENTIELLE DE CE TRAVAIL. NOUS AVONS MIS AU POINT LA CHAMBRE A ARC STABILISE PAR PAROIS (TYPE MAECKER MODIFIE) AFIN DE DISPOSER D'UN ARC STABLE DANS LE TEMPS. LES METHODES DE DIAGNOSTIC DU PLASMA SONT BASEES SUR LA SPECTROSCOPIE D'EMISSION. DEUX METHODES D'INTERPOLATION (POLYNOME, SPLINE) POUR LE LISSAGE DES POINTS EXPERIMENTAUX SONT COMPAREES. LES PROFILS DE TEMPERATURES D'EXCITATION SONT DETERMINES A PARTIR DES RAIES ATOMIQUES (ARGON, CARBONE, OXYGENE) ET LES PROFILS DE TEMPERATURE DE ROTATION A PARTIR DES SPECTRES MOLECULAIRES OBSERVES, SYSTEME DE SWAN C#2 (0,0) ET SYSTEME VIOLET DE CN (0,0). LES PRINCIPAUX RESULTATS EXPERIMENTAUX OBTENUS MONTRENT QUE : - LA COMPOSITION LOCALE DU PLASMA N'EST PAS CELLE INJECTEE, - LA TEMPERATURE AUGMENTE EN FONCTION DU COURANT, - LE GRADIENT DE TEMPERATURE DIMINUE QUAND LE COURANT AUGMENTE, - LES FORMES DES PROFILS DES TEMPERATURES D'EXCITATION SONT MODIFIEES POUR LE PLASMA DU MELANGE AR-CO#2, - LE GRADIENT DE TEMPERATURE DIMINUE QUAND ON AUGMENTE LE POURCENTAGE DE CO#2, - LA FORMATION D'UN NOYAU A TEMPERATURE ELEVEE SUR L'AXE DE LA DECHARGE ET D'UN DEBUT DE PALIER ENTRE 7 000K ET 8 500K, - LES TEMPERATURES DE ROTATIONS SONT VRAISEMBLABLEMENT CELLES DE LA PERIPHERIE.
Author: Hugues Hingana
Publisher:
ISBN:
Category :
Languages : fr
Pages : 166
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Dans le domaine des plasmas thermiques, de nombreux procédés industriels sont caractérisés en supposant l'équilibre thermique. Cependant ces conditions d'équilibre ne sont pas remplies près des bords des plasmas crées par des arcs électriques ou des jets de plasmas. Les écarts à l'équilibre modifient alors considérablement la cinétique chimique du milieu et peuvent affecter le procédé étudié. La compréhension, l'analyse et la prédiction de ces procédés demandent alors une modélisation physique du plasma à deux températures (2T). Cette modélisation s'appuie sur le calcul préalable des propriétés du plasma 2T, calcul qui fait l'objet de cette thèse. La première partie de ce travail est consacrée au calcul de la composition d'un plasma à 2T. Il existe dans la littérature plusieurs théories permettant de calculer les densités des espèces pour un plasma hors équilibre mais l'originalité de ce travail se trouve dans l'établissement d'une loi " pseudo cinétique " régissant le peuplement des espèces. La seconde partie concerne le calcul des propriétés thermodynamiques. Elle s'appuie sur une étude bibliographique des méthodes de calcul déjà existantes et des données indispensables à l'obtention de telles propriétés. Un effort particulier est fait pour séparer les contributions des électrons et celles des particules lourdes dans les échanges d'énergie. La dernière partie de cette thèse est dédiée aux calculs des coefficients de transport. Nous évoquons les grandes lignes de calculs des propriétés intermédiaires avant de présenter les différentes théories existantes dans la littérature. Tous les résultats ont été validés par confrontation du calcul à l'ETL avec la littérature.
Author: Yacine Babou
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Book Description
The prediction of radiative transfers is required in many applications such as the re-entry of space vehicles in the atmosphere. The present work is articulated around three large axes devoted to the study of the radiation emitted from CO2-N2 plasmas for Martian atmospheric entry applications. The first part is dedicated to the construction of spectroscopic databases useful for high resolution radiation prediction of CO2-N2 mixtures for temperatures ranging from 2000 K to 50000 K. The work was especially focused on the construction of exhaustive data related to bound-bound radiative transitions of CO2, CO, CO+ and CN molecules.The second part is dedicated to the presentation and the exploitation of an experimental bench including a microwave plasma torch working at atmospheric pressure. Optical diagnostic benches for emission spectroscopy in the UV, visible and near infrared are used. Measured spectra for CO2 and CO2(97%)-N2(3%) plasmas, were analysed in order to characterise the thermodynamic state. The plasma was found at the equilibrium and the temperature of the CO2 and CO2(97%)-N2(3%) plasmas was found to be at 5400 K and 6500 K respectively. In the third part, a radiative properties model is developed suitable for the prediction of radiative in the framework of multi-temperature description of the thermodynamic state of the atmospheric entry plasma. This approach is combined with the available spectroscopic databases in order to predict radiative transfer for Mars and Earth atmospheric entry.
Author: Claude Bonnefoi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 331
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Book Description
METHODE DE CALCUL DE LA COMPOSITION, LES COEFFICIENTS DE TRANSPORT D'UN MELANGE GAZEUX PARTIELLEMENT IONISE, A LA PRESSION ATMOSPHERIQUE, DONC DU TYPE PLASMA HAUTE PRESSION. ON RESOUT LES EQUATIONS DE BOLTZMANN PAR UNE METHODE ANALOGUE A CELLE DE CHAPMAN-ENSKOG, MAIS CETTE FOIS ENTIEREMENT HORS EQUILIBRE. LES PROCESSUS NON ELASTIQUES SONT ETUDIES ENTIEREMENT HORS EQUILIBRE. LA METHODE EST APPLIQUEE A UN MELANGE ARGON-HYDROGENE (POUR T::(E) VARIANT DE 5000 A 15000 K PAR PAS DE 100 K ET T::(E)/T::(B) VARIANT PAR VALEURS ENTIERES DE 1 A 10), ET LES RESULTATS NUMERIQUES SONT DONNES SOUS FORME DE COURBES
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Domenico M. Doronzo
Publisher: Springer
ISBN: 3030015750
Category : Science
Languages : en
Pages : 281
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Book Description
This edited volume is based on the best papers accepted for presentation during the 1st Springer Conference of the Arabian Journal of Geosciences (CAJG-1), Tunisia 2018. The book is of interest to all researchers in the fields of Mineralogy, Geochemistry, Petrology and Volcanology. The Earth's interior is a source of heat, which makes our planet unique. This source regulates the formation and evolution of rocks at larger scales, and of minerals and sediments toward smaller scales. In such context, the exploration of georesources (products) has to be related to petrogenesis (processes). This volume offers an overview of the state-of-the-art petrogenesis and exploration in, but not limited to, the Middle East and Mediterranean regions. It gives new insights into processes and products related to the Earth's interior, and associated georesources by international researchers. Main topics include: 1. Petrogenetic processes: geochemistry, geochronology and geophysical approaches 2. Surficial processes: sedimentation and facies analysis 3. Applied mineralogy and tectonics 4. Geological research applied to mineral deposits
Author: Edmond I Eger II
Publisher: Springer Science & Business Media
ISBN: 1461484413
Category : Medical
Languages : en
Pages : 930
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Book Description
Edited and written by an international "who's who" of more than 100 authors, including anesthesiologists, nurse anesthetists, bench scientists, a surgeon, and representatives of industry, this text provides a comprehensive history of anesthesia, unique in its focus on the people and events that shaped the specialty around the world, particularly during the past 70 years when anesthesia emerged from empiricism and developed into a science-based practice.
Author: J. Messier
Publisher: Springer Science & Business Media
ISBN: 9400922957
Category : Science
Languages : en
Pages : 393
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Book Description
Photonics, the counterpart of electronics, involves the usage of Photons instead of electrons to process information and perform various switching operations. Photonics is projected to be the technology of the future because of the gain in speed, processing and interconnectivity of network. Nonlinear optical processes will play the key role in photonics Where they can be used for frequency conversion, optical switching and modulation. Organic molecules and polymers have emerged as a new class of highly promising nonlinear optical materials Which has captured the attention of scientists world wide. The organic systems offer the advantage of large nonresonant nonlinearities derived from the 1T electrons contribution, femtosecond response time and the flexibility to modify their molecular structures. In addition, organic polymers can easily be fabricated in various device structures compatible with the fiber-optics communication system. The area of nonlinear optics of organic molecules and polymers offers exciting opportunities for both fundamental research and technologic development. It is truly an interdisciplinary area. This proceeding is the outcome of the first NATO Advanced Research WOrkshop in this highly important area. The objective of the workshop was to provide a forum for scientists of varying background from both universities and industries to come together and interface their expertize. The scope of the workshop was multidisciplinary with active participations from Chemists, physicists, engineers and materials scientists from many countries.
Author: Valerio Bozza
Publisher: Springer
ISBN: 3319274589
Category : Science
Languages : en
Pages : 262
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Book Description
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.
Author: D Brian Spalding
Publisher: Elsevier
ISBN: 1483188175
Category : Reference
Languages : en
Pages : 393
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Book Description
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.
