Solidificação de ligas binarias : existencia de soluções de modelos do tipo campo de fase

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In this work we present results of existence of solutions for some mathematical models of phase- field type for solidification of binary alloys. Firstly, we consider a model based on a highly non-linear degenerate parabolic system of partial differential equations, with three independent variables: phase-field, solute concentration and temperature. After that, we include convective terms in order to consider the flow in the non-solid regions. We study some models of this sort. All of them have the characteristic of modeling the mushy effect with a Carman- Kozeny penalization term added to the velocity equation. The proofs are based on an approximation technique which includes regularization, Faedo-Galerkin method and Leray-Schauder Fixed Point Theorem

ASSUNTO(S)

equações diferenciais parabolicas equações de solidificação navier-stokes

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