Fusão e solidificação em meio poroso

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

The objective of this work is to study the phase change in a constituted porous layer of metallic and non-metallic materials, in such a way that the proposed numerical model can be used to satisfy both types of materiaIs. The problem was modeled as one dimensional in plan geometry, where the constant temperature and constant heat flux boundary conditions were applied at one of porous layer contours. The transient energy equation of the process was solved considering the effect of heat conduction, neglecting the effects of natural convection due to the presence of porous medium. The concept of effective properties has been used to introduce the influence of the porous medium. Numerical simulation was based on the method of the control volume in finite difference form, using moving grid scheme and the implicit Crank Nicholson formulation. The heat flux boundary condition was analyzed using a constant heat flux, which varies with time. Ambient temperature and solar radiation incidence models were obtained from the literature for the case of variable heat fluxo In the case of the solidification process numerical simulations were used to analyze the effects of the parameters such as porosity, imposed boundary temperature, initial temperature, and the porous layer thickness on the temperature distribution, interface behavior, and the total solidification time of the porous layer. For the fusion process the effects of different constant and variable heat flux conditions upon temperature distribution, interface behavior, total solidification time of the porous layer and the surface temperature exposed to the heat flux were analyzed

ASSUNTO(S)

solidificação materiais porosos

ACESSO AO ARTIGO

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