论文标题
热通量平衡描述在平移温度梯度阶段的单向冻结和熔化动力学的描述
Heat flux balance description of unidirectional freezing and melting dynamics on a translational temperature gradient stage
论文作者
论文摘要
方向固化发生在工业和自然过程中，例如冻结，金属加工，生物冷冻保存和土壤冻结。平移温度梯度阶段可以控制定向固化的过程，并使用光学显微镜可视化。在此阶段，冻结速度和温度梯度被解耦并独立控制。在这里，我们使用平移温度梯度阶段研究了薄水样品中相变界面的动力学。我们使用光学显微镜遵循冰水界面的位置，并将其与低速限制中的一维Stefan问题进行比较。我们发现实验观测与理论预测之间的一致性是恒定速度和冰锋加速期间的一致性。这项工作为在平移温度梯度阶段分析和设计实验的实用框架。
Directional solidification occurs in industrial and natural processes, such as freeze-casting, metal processing, biological cryopreservation and freezing of soils. Translational temperature gradient stage allows to control the process of directional solidification and to visualise it with optical microscope. In this stage freezing velocity and temperature gradient are decoupled and are independently controlled. Here we study the dynamics of the phase transition interface in thin water samples using translational temperature gradient stage. We follow position of the ice-water interface with optical microscopy and compare it to solution of one dimensional Stefan problem in the low velocity limit. We find an agreement between experimental observations and theoretical predictions for constant velocity and during acceleration of the ice front. This work presents a practical framework for analysis and design of experiments on a translational temperature gradient stage.
