Abstract
The phenomenon of solidification of a binary alloy (water and ammonium chloride) saturating a packed bed of spheres is investigated experimentally. The system is cooled through its top surface. The effect of heating the bottom surface of the system simultaneously with cooling its top surface is also examined. Three distinct regions were observed in the bed of spheres during the freezing process. A solid region adjacent to the cold top surface, a mixed phase region (commonly termed the “mush” or “mushy zone”) consisting of a mixture of solidified alloy and liquid, and a liquid region. The mixed phase region separated the solid and liquid regions and was of significant extent. The temperature distribution in the solid and in the mixed phase regions was practically linear. Increasing the initial concentration of the system or heating the bottom wall had the effect to retard the rate of solidification. Interestingly, remelting was observed at the solid/mush and mush/liquid interfaces.
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© 1991 Springer Science+Business Media Dordrecht
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Cao, WZ., Poulikakos, D. (1991). Solidification of A Binary Mixture Saturating A Bed of Glass Spheres. In: Kakaç, S., Kilkiş, B., Kulacki, F.A., Arinç, F. (eds) Convective Heat and Mass Transfer in Porous Media. NATO ASI Series, vol 196. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3220-6_24
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DOI: https://doi.org/10.1007/978-94-011-3220-6_24
Publisher Name: Springer, Dordrecht
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