scholarly journals Similarity solution for a two-phase one-dimensional Stefan problem with a convective boundary condition and a mushy zone model

2017 ◽  
Vol 37 (2) ◽  
pp. 2201-2217 ◽  
Author(s):  
Andrea N. Ceretani ◽  
Domingo A. Tarzia
Keyword(s):  
Boundary Condition ◽  
Mushy Zone ◽  
Stefan Problem ◽  
Similarity Solution ◽  
Convective Boundary Condition ◽  
Zone Model ◽  
Two Phase ◽  
Convective Boundary ◽  
One Dimensional

scholarly journals Determination of One Unknown Thermal Coefficient through a Mushy Zone Model with a Convective Overspecified Boundary Condition

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Andrea N. Ceretani ◽  
Domingo A. Tarzia
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Flux ◽  
Mushy Zone ◽  
Phase Change ◽  
Convective Boundary Condition ◽  
Zone Model ◽  
Thermal Coefficient ◽  
Convective Boundary

A semi-infinite material under a solidification process with the Solomon-Wilson-Alexiades mushy zone model with a heat flux condition at the fixed boundary is considered. The associated free boundary problem is overspecified through a convective boundary condition with the aim of the simultaneous determination of the temperature, the two free boundaries of the mushy zone and one thermal coefficient among the latent heat by unit mass, the thermal conductivity, the mass density, the specific heat, and the two coefficients that characterize the mushy zone, when the unknown thermal coefficient is supposed to be constant. Bulk temperature and coefficients which characterize the heat flux and the heat transfer at the boundary are assumed to be determined experimentally. Explicit formulae for the unknowns are given for the resulting six phase-change problems, besides necessary and sufficient conditions on data in order to obtain them. In addition, relationship between the phase-change process solved in this paper and an analogous process overspecified by a temperature boundary condition is presented, and this second problem is solved by considering a large heat transfer coefficient at the boundary in the problem with the convective boundary condition. Formulae for the unknown thermal coefficients corresponding to both problems are summarized in two tables.

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