在充满液体的毛细管中超快速的轴向结
Ze Tao1,2, Yonggang Liu1,2, Ming Wang3,4
1State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|December 5, 2023
概括
在充满液体的毛细血管管中,轴向结比辐射结要快得多. 这种由潜热释放驱动的快速轴向冰形成,决定了结过程和接口动态.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 流体动力学 流体动力学
背景情况:
- 液体填充的毛细管在生物和工程系统中无处不在.
- 了解这些管道内的冰形成动态对于各种应用至关重要.
- 冰层膨胀的机制 (轴向与辐射) 仍然不太清楚.
研究的目的:
- 为了研究充满水的毛细血管管中冰的形成和膨胀的动态.
- 为了阐明轴向和辐射结速度之间的关系.
- 确定影响冰水界面形状的关键因素.
主要方法:
- 在毛细血管管中冷的实验观察.
- 阶段过渡动态的理论建模.
- 对冰核形成和传播速度的分析.
主要成果:
- 轴向结发生的速度明显快 (3 个数量级),而不是沿着毛细血管内壁的辐射结.
- 在轴向结过程中的快速潜热释放驱动超冷却并影响复苏.
- 冰水界面的形状取决于毛细血管的长度与半径的比率以及超冷的程度.
结论:
- 轴向结主导了毛细血管管中的初始冰传播.
- 该研究提供了古典核化理论和斯蒂芬的相变过渡解决方案之间的桥梁.
- 结果提供了关于有限几何体内的热传递和相变现象的见解.
相关概念视频
01:18Rise of Liquid in a Capillary Tube
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
01:20Capillary Electrophoresis: Instrumentation
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...