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Type: Artigo de periódico
Title: A tridimensional phase-field model with convection for phase change of an alloy
Author: Boldrini, JL
Planas, G
Abstract: We consider a tridimensional phase-field model for a solidification/melting non-stationary process, which incorporates the physics of binary alloys, thermal properties and fluid motion of non-solidified material. The model is a free-boundary value problem consisting of a highly non-linear parabolic system including a phase-field equation, a heat equation, a concentration equation and a variant of the Navier-Stokes equations modified by a penalization term of Carman-Kozeny type to model the flow in mushy regions and a Boussinesq type term to take into account the effects of the differences in temperature and concentration in the flow. A proof of existence of generalized solutions for the system is given. For this, the problem is firstly approximated and a sequence of approximate solutions is obtained by Leray-Schauder's fixed point theorem. A solution of the original problem is then found by using compactness arguments.
Subject: phase-field models
phase change
Country: EUA
Editor: Amer Inst Mathematical Sciences
Rights: aberto
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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