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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Lens and dendrite formation during colloidal solidification
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Lens and dendrite formation during colloidal solidification

机译：APS-流体动力学APS分部第70届年会-事件-胶体凝固过程中晶状体和枝晶的形成

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摘要

Colloidal particles in suspension are forced into a variety of morphologies when the suspending fluid medium is frozen: soil is compacted between ice lenses during frost heave; ice templating is a recent and growing technology to produce bio-inspired, micro-porous materials; cells and tissue can be damaged during cryosurgery; and metal-matrix composites with tailored microstructure can be fabricated by controlled casting. Various instabilities that affect the microscopic morphology are controlled by fluid flow through the compacted layer of particles that accumulates ahead of the solidification front. By analysing the flow in connection with equilibrium phase relationships, we develop a theoretical framework that identifies two different mechanisms for ice-lens formation, with and without a frozen fringe, identifies the external parameters that differentiates between them and the possibility of dendritic formations, and unifies a range of apparently disparate conclusions drawn from previous experimental studies.
机译：当悬浮的流体介质被冷冻时，悬浮液中的胶体颗粒被压缩为多种形态：在冻胀期间，土壤在冰晶之间被压实;冰模板是生产生物启发的微孔材料的最新技术。冷冻手术中细胞和组织可能受损;可以通过控制铸造来制造具有特定微观结构的金属基复合材料。影响流体流动形态的各种不稳定性，是由流过堆积在凝固前沿前方的压实颗粒层的流体流控制的。通过分析与平衡相关系有关的流动，我们建立了一个理论框架，该框架确定了有和没有冻结条纹的两种不同的冰透镜形成机制，确定了区分它们和树突形成可能性的外部参数，以及统一了先前实验研究得出的一系列显然不同的结论。

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