Ce travail comporte deux parties. Dans la première, une modélisation des transferts couplés par convection, conduction et rayonnement, au sein d'un milieu poreux semi-transparent confiné dans une cavité inclinable chauffée différentiellement est proposée. Le transfert radiatif est évalué par un modèle gris à deux-flux, les mouvements de convection dans le milieu poreux étant modélisés sur la base de l'hypothèse de BOUSSINESQ et de la loi de DARCY. Les équations sont résolues à partir d'un schéma de différences finies. Des résultats numériques sont présentés pour des laines de verre dont les paramètres radiatifs sont déterminés expérimentalement. La détermination expérimentale des' coefficients d'absorption, de diffusion d'un paramètre caractérisant la forme de la fonction de phase, de laines de verre, constitue la deuxième partie de ce travail. Ces coefficients sont obtenus à partir d'une méthode d'optimisation dans laquelle des mesures de transmittance sont comparées avec les valeurs théoriques correspondantes calculées à partir d'un modèle de transfert radiatif basé sur la méthode des ordonnées discrètes et la fonction de phase d'HENYEY-GREENSTEIN. Ces mesures de transmittance spectrale, bidirectionnelle ou unidirectionnelle, ont été effectuées sur un dispositif mis au point dans le cadre de ce travail. Elles ont permis de déterminer les paramètres radiatifs pour des longueurs d'onde comprises entre 2μm et 10,5μm. Ces valeurs ont été compares aux résultats de la théorie de MIE et l'influence de la température sur ces paramètres étudiée pour une gamme de températures comprises entre 20°C et 400°C

Problems after each chapter

Nuclear engineering has undergone extensive progress over the years. In the past century, colossal developments have been made and with specific reference to the mathematical theory and computational science underlying this discipline, advances in areas such as high-order discretization methods, Krylov Methods and Iteration Acceleration have steadily grown. Nuclear Computational Science: A Century in Review addresses these topics and many more; topics which hold special ties to the first half of the century, and topics focused around the unique combination of nuclear engineering, computational science and mathematical theory. Comprising eight chapters, Nuclear Computational Science: A Century in Review incorporates a number of carefully selected issues representing a variety of problems, providing the reader with a wealth of information in both a clear and concise manner. The comprehensive nature of the coverage and the stature of the contributing authors combine to make this a unique landmark publication. Targeting the medium to advanced level academic, this book will appeal to researchers and students with an interest in the progression of mathematical theory and its application to nuclear computational science.

This comprehensive volume offers readers a progressive and highly detailed introduction to the complex behavior of neutrons in general, and in the context of nuclear power generation. A compendium and handbook for nuclear engineers, a source of teaching material for academic lecturers as well as a graduate text for advanced students and other non-experts wishing to enter this field, it is based on the author’s teaching and research experience and his recognized expertise in nuclear safety. After recapping a number of points in nuclear physics, placing the theoretical notions in their historical context, the book successively reveals the latest quantitative theories concerning: • The slowing-down of neutrons in matter • The charged particles and electromagnetic rays • The calculation scheme, especially the simplification hypothesis • The concept of criticality based on chain reactions • The theory of homogeneous and heterogeneous reactors • The problem of self-shielding • The theory of the nuclear reflector, a subject largely ignored in literature • The computational methods in transport and diffusion theories Complemented by more than 400 bibliographical references, some of which are commented and annotated, and augmented by an appendix on the history of reactor physics at EDF (Electricité De France), this book is the most comprehensive and up-to-date introduction to and reference resource in neutronics and reactor theory.

Proceedings of the 8th ASTM-Euratom Symposium, held in Vail, Colorado, Aug.-Sept. 1993, to provide a forum for experts to discuss their latest results under the broad theme of dosimetry for the correlation of radiation effects. Preceded by a summary of the keynote presentations and followed by summa

Building upon the success of the first edition, the Nuclear Engineering Handbook, Second Edition, provides a comprehensive, up-to-date overview of nuclear power engineering. Consisting of chapters written by leading experts, this volume spans a wide range of topics in the areas of nuclear power reactor design and operation, nuclear fuel cycles, and radiation detection. Plant safety issues are addressed, and the economics of nuclear power generation in the 21st century are presented. The Second Edition also includes full coverage of Generation IV reactor designs, and new information on MRS technologies, small modular reactors, and fast reactors.