We describe and examine theoretically a model of a mushy layer that forms during the solidification of an aqueous colloidal suspension from a cooled boundary. The model accounts for the formation of three regions: a frozen layer containing both pore ice and segregated ice, a mushy layer containing segregated ice but no pore ice, and a boundary layer of particles ahead of the mushy layer. Diffusion of the colloidal particles in the mushy layer is shown to be equivalent to thermal regelation of the particles through ice. The behaviour of the system is sensitive to the size and initial concentration of the colloidal particles. The model is in good qualitative agreement with experimental results on aqueous alumina suspensions.
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[v1] 2016-06-30 10:15:19
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