Título

LATENT HEAT DETERMINATION FROM COOLING CURVES DURING SOLIDIFICATION OF METALS BY AN ALTERNATIVE METHOD CONSIDERING THE METAL AND MOLD COOLING PROCESSES

LATENT HEAT DETERMINATION FROM COOLING CURVES DURING SOLIDIFICATION OF METALS BY AN ALTERNATIVE METHOD CONSIDERING THE METAL AND MOLD COOLING PROCESSES

Autoria

Gonzalez-Rivera, Carlos; Villeda, Adrian Manuel Amaro; Argaez, Marco Aurelio Ramirez

DOI

10.5151/1982-9345-30805

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Resumo

An alternative cooling curve analysis method focused on the experimental determination of the latent heat of phase changes and phase transformation kinetics is proposed in this work. The method analyses the cooling process of a metallic sample, initially liquid that is contained into a cylindrical metallic mold, both of known weight, thermally isolated at its top and bottom. The method is based on an energy balance associated with the experimental measurement of the temperature change of the sample and the mold during their cooling process. From the numerical processing of the cooling curves, are obtained approximate values of the acting global heat transfer coefficient as a function of temperature in order to describe quantitatively the energy exchange of the metal/mold system with its surroundings. These relationships and other experimental data are used to process the cooling curve of the sample and the mold during solidification, in order to obtain the latent heat of solidification.The method was applied experimentally to zinc and tin of commercial purity, initially liquids and contained into stainless steel molds in order to determine its ability to measure the latent heat of solidification. The obtained results suggests that this method shows a good potential to characterize the solidification of metals.

 

Palavras-chave

Solidificacion, Cinetica, Analisis de curvas de enfriamiento

Solidification, Kinetics, Cooling curve analysis