Numerical Study of Ice Melting Inside a Rectangular Cavity and a Horizontal Cylinder Including Convective Effects


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Abstract


The present work deals with the numerical study of ice melting inside a rectangular cavity with all isothermally heated walls and inside a horizontal cylinder with isothermally heated wall, utilizing a CFD code. Initially the solid material is sub-cooled. The objective is to verify the influence of the heating in the melting process as well as the sub-cooling effect. Some simplifying hypotheses were assumed in the mathematical model. The thermophysical properties of phase change material were considered constants, except for the density where the relation proposed by Gebhart and Mollendorf [1] was used. The problem was solved by using a mathematical formulation based on the enthalpy-porosity method, which allows the use of a fixed spatial grid. The total heat flux in the inner surfaces was obtained for the systems, as well as several temperature profiles, streamlines and melting front positions. Correlations for the total ice melting time as a function of the Stefan number was presented. It was found that the convective effects directly influences the melting front profiles, the heat transfer in the systems and the melting rates.
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Keywords


Horizontal Cylinder; Ice Melting; Natural Convection; PCM; Simulation

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References


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