PHASES MODEL FOR BINARY-CONSTITUENT SOLID-LIQUID PHASE-TRANSITION, .2. APPLICATIONS

A new solution procedure for binary-constituent solid-liquid phase-tra nsition problems has been applied to several one- and two-dimensional problems. Three one-dimensional applications (a pure material melting problem, a unidirectional Ag-Sn solidification problem, and a Bridgman furnace simulation) illustrate different interface solute redistribut ion and Ste number sensitivity results. In addition, two-dimensional a pplications examine Pb-Sn and NH4Cl-H2O solidification problems within moderate- and low-aspect-ratio enclosures. In these problems, buoyanc y-driven and shear-driven recirculation cells in the liquid regions of the cavity, penetration of bulk fluid across the liquidus interface, and energy and species advection are observed. The model's results agr ee closely with previous analytical and experimental results, and its performance indicates a cost-effective and physically based approach t o solid-liquid phase-transition discrete analysis.