Correlation of Melting Results for Both Pure Substances and Impure Substances

[+] Author and Article Information
E. M. Sparrow, G. A. Gurtcheff, T. A. Myrum

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

J. Heat Transfer 108(3), 649-653 (Aug 01, 1986) (5 pages) doi:10.1115/1.3246985 History: Received September 10, 1985; Online October 20, 2009


Melting experiments were performed encompassing both pure and impure substances. The pure substances included n -octadecane paraffin and n -eicosane paraffin, while the impure substances were mixtures synthesized from the pure paraffins. The experiments were carried out in a closed vertical tube whose wall was subjected to a step-change increase in temperature to initiate the melting. For each impure substance, supplementary measurements were made of two characteristic temperatures: the temperature T ** at which melting of the solid phase first begins and the lowest temperature T * at which the melting can go to completion. For a pure substance, T ** = T *. The time-dependent melting results for all the investigated substances, both pure and impure, were well correlated as a function of FoSte**(Gr**)1/8 alone, where the ** signifies the presence of T ** in the temperature difference which appears in Ste and Gr. This correlation enables melting rates for impure substances to be determined from melting rates for pure substances. The T ** values needed for the implementation of the correlation can be obtained from simple experiments, obviating the need for the complete equilibrium phase diagram.

Copyright © 1986 by ASME
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