Ground Freezing 2000 - Frost Action in Soils

Ground Freezing 2000 - Frost Action in Soils PDF Author: J.F. Thimus
Publisher: CRC Press
ISBN: 1000151085
Category : Technology & Engineering
Languages : en
Pages : 715

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Book Description
There has been increasing interest in the use of Artificial Ground Freezing (AGF) in forming efficient barriers to prevent pollution penetrating geological deposits. This volume includes papers on heat and mass transfer, frost susceptibility and frost heave, and mechanical properties.

Ground Freezing 2000 - Frost Action in Soils

Ground Freezing 2000 - Frost Action in Soils PDF Author: J.F. Thimus
Publisher: CRC Press
ISBN: 1000151085
Category : Technology & Engineering
Languages : en
Pages : 715

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Book Description
There has been increasing interest in the use of Artificial Ground Freezing (AGF) in forming efficient barriers to prevent pollution penetrating geological deposits. This volume includes papers on heat and mass transfer, frost susceptibility and frost heave, and mechanical properties.

INTERACTIONS PARTICULES/FRONT DE SOLIDIFICATION

INTERACTIONS PARTICULES/FRONT DE SOLIDIFICATION PDF Author: PATRICK.. CASSES
Publisher:
ISBN:
Category :
Languages : fr
Pages : 158

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Book Description
LA COMPREHENSION DU PHENOMENE DE SEGREGATION DE PARTICULES PAR UN FRONT DE SOLIDIFICATION EST D'UNE IMPORTANCE CAPITALE DANS PLUSIEURS DOMAINES D'APPLICATIONS TELS QUE LA METALLURGIE, LA SCIENCE DES MATERIAUX, LA BIOLOGIE APRES UNE PRESENTATION GENERALE DE LA SOLIDIFICATION, LES PROCESSUS DE REPULSION OU D'ATTRACTION DE LA PARTICULE SONT DECRITS A L'AIDE DES FORCES EXERCEES SUR LA PARTICULE. DANS LE CAS IDEAL (FRONT PLAN ET PARTICULE SPHERIQUE LISSE), NOUS CALCULONS LES TROIS FORCES AGISSANT SUR LA PARTICULE (PESANTEUR, VISQUEUSE, DISJONCTION). ENSUITE, NOUS INCLUONS DANS LES DIFFERENTES FORCES LA COURBURE DU FRONT ET QUELQUES PROPRIETES DE SURFACE (RUGOSITE, DEPOT OU ABSORPTION, COUCHE POREUSE). NOUS ANALYSONS LA DEFORMATION DU FRONT PRES DE LA PARTICULE DUE A LA DIFFERENCE DE CONDUCTIVITE THERMIQUE ENTRE LA PARTICULE ET LA PHASE LIQUIDE. DES SIMULATIONS NUMERIQUES SONT EFFECTUEES ET COMPAREES AVEC SUCCES AUX EXPERIENCES PRECEDENTES ENTREPRISES DANS NOTRE EQUIPE POUR LE SYSTEME EAU-GLACE-PARTICULES (EN NYLON ET UN ACIER). A PARTIR DE LA RELATION FONDAMENTALE DE LA DYNAMIQUE, LES VITESSES CRITIQUES (VITESSE DU FRONT AU-DESSOUS DE LAQUELLE LA PARTICULE EST REPOUSSEE ET AU-DESSUS DE LAQUELLE ELLE EST RATTRAPEE) SONT DETERMINEES PAR UNE NOUVELLE APPROCHE THEORIQUE. LES RESULTATS NUMERIQUES OBTENUS CONCORDENT AVEC DE RECENTS TRAVAUX EXPERIMENTAUX. ENFIN, NOUS AVONS ETUDIE EXPERIMENTALEMENT L'INFLUENCE DES PROPRIETES DE SURFACE DANS DES EXPERIENCES DE SOLIDIFICATION VERTICALE. LES TRAITEMENTS QUE L'ON A EFFECTUES SUR LA SURFACE DES PARTICULES EN NYLON SONT LES SUIVANTS: DEPOT D'UNE FINE COUCHE DE CARBONE ET D'OR, ABSORPTION D'ETHANOL ET DEPOLISSAGE. CES RESULTATS EXPERIMENTAUX SONT EN ACCORD AVEC NOTRE APPROCHE THEORIQUE (CALCUL DES DIFFERENTES FORCES)

ETUDE DES INTERACTIONS PARTICULES FRONT DE SOLIDIFICATION

ETUDE DES INTERACTIONS PARTICULES FRONT DE SOLIDIFICATION PDF Author: MOHAMMED.. YEMMOU
Publisher:
ISBN:
Category :
Languages : fr
Pages :

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Book Description
LE SUJET ABORDE CONCERNE L'INTERACTION ENTRE DES BILLES EN NYLON DE PETITS DIAMETRES ET UNE INTERFACE EAU-GLACE SE PROPAGEANT VERTICALEMENT DE BAS EN HAUT. NOTRE OBJECTIF EST D'EVALUER LES PARAMETRES PRINCIPAUX DONT DEPEND L'ENGOUFFREMENT OU NON DE TELLES BILLES DANS LA GLACE (EXEMPLES: TAILLE DE LA BILLE, SA MOUILLABILITE, SA RUGOSITE, IMPURETES, BULLES D'AIR, GRADIENT THERMIQUE A L'INTERFACE) PAR LE BIAIS DE MESURES OPTIQUES. NOUS AVONS OBTENU DE NOUVEAUX RESULTATS RELATIFS AU COMPORTEMENT DE PARTICULES EN NYLON A L'APPROCHE D'UNE INTERFACE EAU-GLACE EN MOUVEMENT, POUR DES TAILLES DE PARTICULES NON ETUDIEES AUPARAVANT (0,1 CM 2R 1 CM) OU R EST LE RAYON DE LA PARTICULE. NOUS AVONS MIS EN EVIDENCE LE ROLE IMPORTANT DE LA FORCE DE GRAVITE, ROLE JUSQU'A PRESENT NEGLIGE. CECI NOUS A PERMIS D'ESTIMER UNE TAILLE CRITIQUE 2R=0,7 CM AU-DELA DE LAQUELLE AUCUNE REPULSION N'EST APPAREMMENT POSSIBLE, TOUT AU MOINS POUR UNE SOLUTION ULTRA DEGAZEE A DE TRES FAIBLES VITESSES DU FRONT INFERIEURES OU EGALES A 10#-#4 CM/SEC. POUR DES DIAMETRES 2R=0,7 CM, ON TROUVE QUE LA VITESSE CRITIQUE (VITESSE DU FRONT POUR LAQUELLE LA CAPTURE OU LA REPULSION EST POSSIBLE) EST INVERSEMENT PROPORTIONNELLE A LA TAILLE DE LA PARTICULE, CE QUI EST EN ACCORD AVEC LES MODELES THEORIQUES RECENTS. LES RESULTATS OBTENUS SOULIGNENT EGALEMENT L'EXTREME IMPORTANCE DE LA SURFACE DE CONTACT DES PARTICULES AVEC L'INTERFACE SOLIDE-LIQUIDE. PLUS CETTE SURFACE EST GRANDE (DISQUES, BATONNETS, GROSSES BILLES, BILLES RUGUEUSES) ET PLUS LA REPULSION EST FAVORISEE. L'ANALYSE DES EFFETS DU DEMOUILLAGE LORS DE L'ENGOUFFREMENT NOUS A INCITE A UTILISER DES BILLES DE CONDUCTIVITE THERMIQUE ELEVEE TEL QUE L'ACIER. NOUS AVONS PROUVE QUE C'EST L'EFFET THERMIQUE QUI AU PREMIER ORDRE DICTE LA DEFORMATION DE L'INTERFACE A L'APPROCHE DE LA PARTICULE ET LA FORME DU MENISQUE AU COURS DE L'ENGOUFFREMENT; QUANT AUX FORCES INTERFACIALES, ELLES N'INTERVIENNENT QU'AU SECOND ORDRE

A Dynamic Model for Particle-solidification Front Interactions

A Dynamic Model for Particle-solidification Front Interactions PDF Author: Justin Wayne Garvin
Publisher:
ISBN:
Category :
Languages : en
Pages : 212

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Book Description


Solidification Processing of Metal Matrix Composites

Solidification Processing of Metal Matrix Composites PDF Author: Nikhil Gupta
Publisher: Wiley-TMS
ISBN:
Category : Science
Languages : en
Pages : 386

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Book Description
"Solidification Processing of Metal Matrix Composites" (MMCs) focuses primarily on microcomposites but also covers macrocomposites, nanocomposites and foams. There are four main areas detailed: fundamentals of solidification synthesis, which examines issues related to stir mixing, pressure infiltration, transfer of particles or fibers through gas-liquid and liquid-solid interfaces, and particle/fiber interactions with fluids; processing and microstructures, which focuses on microstructure formation during solidification of MMC under different conditions, such as nucleation, growth, heat transfer, microsegregation, macrosegregation and interactions between solidifying interfaces, particles and fibers; and, properties of solidification processing, covering the relationship between the microstructures and properties. Comparisons are made between properties of solidification processed composites and monolithic and composites made by solid and vapor phase processes. It also details the application of solidification processed MMCs, revealing current and future applications especially in automotive, aerospace, railroad, thermal management, electromechanical machinery and recreational equipment sectors.

Interfacial Forces in Aqueous Media

Interfacial Forces in Aqueous Media PDF Author: Carel J. van Oss
Publisher: CRC Press
ISBN: 9780824791681
Category : Science
Languages : en
Pages : 458

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Book Description
"This practical monograph treats, for the first time, the interfacial forces among biopolymers, particles and surfaces, and cells and other polar and apolar polymers encompassing Lifshitz-van der Waals and electrostatic interactions as well as hydrogen-bonding interactions between colloidal entities in polar media, especially water."

Solidification and Gravity

Solidification and Gravity PDF Author:
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 676

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Book Description


Development of Sharp Interface Simulation Techniques for Study of Solidification Front-particle Interactions

Development of Sharp Interface Simulation Techniques for Study of Solidification Front-particle Interactions PDF Author: Yi Yang
Publisher:
ISBN:
Category : Solidification
Languages : en
Pages : 272

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Book Description


Modeling of Casting, Welding, and Advanced Solidification Processes-X

Modeling of Casting, Welding, and Advanced Solidification Processes-X PDF Author: Doru Michael Stefanescu
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 778

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Book Description
The latest in a series of proceedings from conferences sponsored by Engineering Conferences International (formerly the Engineering Foundation), this volume captures the current state of the art in the field of mathematical modeling of casting and welding processes. This edition deals with such traditional issues as microstructure formation, mushy zone rheology, segregation, microporosity, and thermo-mechanical simulation, as well as new themes reflecting industrial needs, including simulation of melting and solid separation in the melt (inclusion removal) and simulation of aggregate and porous materials (mold and core simulation). This book contains 90 papers as well as abstracts of invited talks. The proceedings focus primarily on the continuous development of tools for simulation of microstructure evolution, database and critical experiments, and shaped-casting simulation.

CFD Modeling and Simulation in Materials Processing

CFD Modeling and Simulation in Materials Processing PDF Author: Laurentiu Nastac
Publisher: John Wiley & Sons
ISBN: 1118364643
Category : Technology & Engineering
Languages : en
Pages : 365

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Book Description
Proceedings of a symposium sponsored by Association for Iron and Steel Technology and the Process Technology and Modeling Committee of the Extraction and Processing Division and the Solidification Committee of the Materials Processing and Manufacturing Division of TMS (The Minerals, Metals & Materials Society) Held during the TMS 2012 Annual Meeting & Exhibition Orlando, Florida, USA, March 11-15, 2012