在一个充满水的毛细血管管中周期性爆发结
Ze Tao1,2, Xiuwei Wan1,2, Shaobao Liu1,2
1State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R. China.
ACS applied materials & interfaces
|December 2, 2024
概括
在多孔结构中起的冰会造成损伤. 这项研究揭示了由表面张力和关键接触角度驱动的毛细管中水凸破的周期性热释放,为微流体设备设计提供了洞察力.
科学领域:
- 物理科学 物理科学
- 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:
- 充满水的多孔结构在科学和工程中很常见.
- 这些结构中的冷水会导致冰升高,导致永久土和伤等损害.
研究的目的:
- 为了研究一个独特的冰冷热释放模式,在毛细管内的水柱中.
- 了解表面张力和接触角度在升现象中的作用.
主要方法:
- 在毛细管的末端观察冷水的周期性膨胀和破裂.
- 对临界接触角及其与表面张力的关系进行分析.
- 根据毛细管尺寸,量化凸起的大小和重复频率.
主要成果:
- 观察到一种独特的周期性热释放模式,其特点是凸起和破裂.
- 确定了大约135°的临界接触角,平衡了表面张力.
- 凸起的大小与毛细血管直径非线性相关;重复频率与直径相反,直接与水柱长度相反.
结论:
- 表面张力在通过定期的水排放调节升方面发挥着至关重要的作用.
- 这些发现提供了关于表面张力和升之间的相互作用的关键见解.
- 这项研究对设计具有增强抗能力的微流体设备有影响.
相关概念视频
01:20Capillary Electrophoresis: Instrumentation
181
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...
181
01:18Rise of Liquid in a Capillary Tube
1.4K
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.
1.4K
01:19Capillarity in Fluid
134
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
134