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Modelling the effect of binary phase composition on inward solidification of a particle

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Yang, Jia, Zhao, Changying and Hutchins, David A. (2012) Modelling the effect of binary phase composition on inward solidification of a particle. International Journal of Heat and Mass Transfer, Vol.55 (No.23-24). pp. 6766-6774. doi:10.1016/j.ijheatmasstransfer.2012.06.084 ISSN 0017-9310.

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Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.201...

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Abstract

In the traditional inward solidification model of a sphere, the interface temperature of liquid–solid is considered as a constant freezing point, but majority of materials have a freezing temperature range and the freezing temperature descends with the change of liquid–solid two phase composition. By taking binary alloy for instance, a new liquid–solid interface model is proposed based on the solid fraction, because the solid fraction plays the bridge between the freezing temperature and the binary phase composition. The new model determines a corresponding relationship between the position of liquid–solid moving interface and the freezing temperature, and it is applied in the solidification analysis of a single encapsulated phase change material (PCM) particle. For different type of PCMs, two rules have been built. A linear rule is designed for the material with the narrow freezing temperature range; to materials with the wide freezing temperature range like Copper (Cu–Al), the solid fraction presents a complicated function relationship with the freezing temperature, so in the numerical calculation, the local linear rule is employed based on the transient interpolation of the solid fraction in the discrete points which represent the freezing temperature against solid fraction in DSC measurements or equilibrium phase diagrams.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Journal or Publication Title: International Journal of Heat and Mass Transfer
Publisher: Pergamon-Elsevier Science Ltd.
ISSN: 0017-9310
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Vol.55
Number: No.23-24
Page Range: pp. 6766-6774
DOI: 10.1016/j.ijheatmasstransfer.2012.06.084
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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