Controls on microstructural features during solidification of colloidal suspensions
Controls on microstructural features during solidification of colloidal suspensions
复制标题
胶体悬浮液凝固过程中微观结构特征的控制
DOI:
10.1016/j.actamat.2018.05.049
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发表时间:
2018-09
期刊:
影响因子:
9.4
通讯作者:
M Grae Worster
中科院分区:
文献类型:
--
作者:
Jiaxue You;Zhijun Wang;M Grae Worster
We present a mathematical model of the directional freezing of colloidal suspensions. Key ingredients of the model are the disjoining forces between the colloidal particles and the solidified suspending fluid, flow of the suspending fluid towards the solidification front through an accumulating layer of particles, and flow through microscopic films of unfrozen liquid separating particles from the freezing front. Our model predicts three different modes of solidification leading to different microstructures: dendritic formations; laddered structures of ice spears and lenses; a frozen fringe, from which transverse ice lenses can form. It explains why different researchers have reported the existence of ice lensing with and without the pre-existence of frozen fringes. Our quantitative predictions are encapsulated within a universal, dimensionless phase diagram showing which microstructure is to be expected under which operating conditions, and we show that these predictions are consistent with previous experimental studies as well as new experiments that we present here.
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影响因子:
1.8
作者:
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通讯作者:
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影响因子:
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影响因子:
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