通过纹理超水表面稳定Leidenfrost蒸气层的稳定
Ivan U Vakarelski1, Neelesh A Patankar, Jeremy O Marston
1Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia. ivanuriev.vakarelski@kaust.edu.sa
Nature
|September 14, 2012
概括
有纹理的超水表面可以防止蒸汽膜在沸时崩. 这种稳定控制热传递和液态气相过渡,避免有害的蒸汽爆炸,并使低阻力应用.
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:
- 莱登弗罗斯特效应描述了蒸汽薄膜在热表面上升起,这对于沸至关重要.
- 蒸汽膜的崩可以引发危险的蒸汽爆炸,特别是在核电中.
- 蒸汽膜可以减少液体-固体的阻力.
研究的目的:
- 研究抑制热表面蒸汽薄膜崩的方法.
- 探索表面纹理在稳定蒸发蒸汽膜中的作用.
- 控制热传递和液态气相转换.
主要方法:
- 使用有纹理的超水表面.
- 将光滑表面的沸行为与有纹理的疏水表面进行比较.
- 在冷却过程中观察蒸汽薄膜的稳定性和崩动态.
主要成果:
- 纹理超疏水表面完全抑制了蒸汽薄膜的崩.
- 光滑的疏水表面仍然表现出蒸汽薄膜崩和核酸沸.
- 纹理表面上的蒸汽层逐渐放松,没有爆炸性相位过渡.
结论:
- 超疏水材料上的拓纹理对于稳定蒸汽层至关重要.
- 这种稳定控制热表面的热传递和液态气相转换.
- 潜在的应用包括控制相位过渡 (冰/) 和设计低阻力表面.
相关概念视频
Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Phase Transitions: Vaporization and Condensation
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
Surface Tension
Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...


