Book ChapterDOI
Convection heat and mass transfer in alloy solidification
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In this paper, internal convection strongly influences alloy-solidification processes and local cooling and solidification rates are affected by convection conditions, which, in turn, have a strong influence on the microstructural features of a casting.Abstract:
Publisher Summary This chapter reviews that internal convection strongly influences alloy-solidification processes. Local cooling and solidification rates are affected by convection conditions, which, in turn, have a strong influence on the microstructural features of a casting. Moreover, advective transport of interdendritic liquid is responsible for macrosegregation. To improve solid/liquid-phase-change processes involving multicomponent materials, it is vital that engineers understand the convection conditions associated with the processes. However, obtaining a reliable knowledge base for guiding process improvements is made difficult by several complicating features associated with alloy solidification. The chapter highlights that single-domain models for binary solid/liquid-phase- change systems have contributed to enhancing the knowledge base, and the results of several computational studies were reviewed to demonstrate the potential of the models to predict convective transport phenomena for a wide variety of process conditions. Possible means of intelligently controlling alloy-solidification processes were discussed and the role of numerical simulation in developing control strategies was reviewed.read more
Citations
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Journal ArticleDOI
The effect of free-floating dendrites and convection on macrosegregation in direct chill cast aluminum alloys. Part I : model development
TL;DR: In this paper, a binary mixture model was developed that accounts for the redistribution of alloying elements through the transport of free-floating dendrites and fluid flow in the melt and mushy zones of a solidifying ingot.
Journal ArticleDOI
Segregation in cast products
TL;DR: In this paper, the authors discuss centreline macrosegregation during continuous casting of steel, methods to avoid it, and the importance of early columnar-to-equiaxed transition (CET) as well as the fundamentals of CET.
Journal ArticleDOI
Thermal Processing of Materials: From Basic Research to Engineering
TL;DR: In this paper, the authors review the active and growing field of thermal processing of materials, with a particular emphasis on the linking of basic research with engineering aspects, and couple research efforts directed at the fundamental mechanisms that govern materials processing with engineering issues that arise in the process, such as system design and optimisation, process feasibility and selection of operating conditions to achieve desired product characteristics.
Journal ArticleDOI
Magnetohydrodynamic flows in porous media
TL;DR: In this article, the tensorial filtration law in rigid porous media for steady-state slow flow of an electrically conducting, incompressible and viscous Newtonian fluid in the presence of a magnetic field is obtained by upscaling the flow at pore scale.
Journal ArticleDOI
Average momentum equation for interdendritic flow in a solidifying columnar mushy zone
TL;DR: In this paper, the authors derived the macroscopic momentum transport equation in a non-homogeneous solidifying columnar dendritic mushy zone using the method of volume averaging.
References
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Book
Numerical heat transfer and fluid flow
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
Journal ArticleDOI
The numerical computation of turbulent flows
Brian Launder,D. B. Spalding +1 more
TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.
Book
Fundamentals of Solidification
W. Kurz,D. J. Fisher +1 more
TL;DR: In this article, Atom Transfer at the Solid/Liquid Interface Morphological Instability of a Solid/ Liquid Interface Solidification Microstructure: Cells and Dendrites SolidificationMicrostructure, Eutectic and Peritectic Solute Redistribution Rapid Solidization Microstructures Summary Appendices Symbols Index
Journal ArticleDOI
A fixed grid numerical modelling methodology for convection-diffusion mushy region phase-change problems
Vaughan R Voller,C. Prakash +1 more
TL;DR: In this article, an enthalpy formulation based fixed grid methodology is developed for the numerical solution of convection-diffusion controlled mushy region phase-change problems, where the basic feature of the proposed method lies in the representation of the latent heat of evolution, and of the flow in the solid-liquid mushy zone, by suitably chosen sources.
Journal ArticleDOI
Mathematical Modeling of Two-Phase Flow
TL;DR: In this paper, a continuum mechanics approach to two-phase flow is reviewed and an averaging procedure is applied to the exact equations of motion, and the nature of the resulting equations is studied.
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