滴滴对具有奇点的超疏水表面的影响
Xu Chen1,2, Shao-Fei Zheng1,2,3, Shi-Hua Shi1,2
1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Langmuir : the ACS journal of surfaces and colloids
|October 16, 2024
概括
在超疏水表面上优化奇点排列可显著减少滴滴撞击接触时间. 五个奇点实现了61.7%的减少,克服了抗结冰应用中较少奇点的局限性.
科学领域:
- 流体动力学 流体动力学
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
背景情况:
- 减少滴水接触时间对于抗结冰和其他工业应用至关重要.
- 具有奇点的超疏水表面通过环状反弹提供了有限的接触时间缩短.
- 需要进一步优化,以打破现有的联系时间限制.
研究的目的:
- 调查奇点数和排列对滴滴动态和接触时间的影响.
- 探索进一步减少超疏水表面滴滴接触时间的方法.
- 为了优化奇点配置,以提高抗结冰性能.
主要方法:
- 实验研究滴滴对具有不同奇点数和无维间距 (l*) 的超疏水表面的影响.
- 在不同的韦伯数 (We) 下分析动态特征和接触时间.
- 系统地改变奇点配置以确定最佳安排.
主要成果:
- 两个奇点 (l* < 1.0) 创建液体环和子单位,随着We的增加,接触时间减少.
- 液膜穿孔在l* > 1.0.0时是有限的.
- 五个奇点,包括一个中心的奇点,穿透了中央的液体膜,促进环状反弹,与平面相比,减少了61.7%的接触时间.
结论:
- 优化奇点数和排列是显著减少滴水冲击接触时间的关键.
- 五个奇点在最小化接触时间方面取得了突破,超过了单个和双个奇点配置.
- 这种优化的配置为先进的抗结冰技术提供了巨大的潜力.
相关概念视频
Surface Tension, Capillary Action, and Viscosity
27.6K
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...
27.6K
Surface Tension of Fluid
246
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...
Surface tension varies...
246
Colloidal precipitates
521
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
521
Excess Pressure Inside a Drop and a Bubble
1.6K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
1.6K
Cohesion
53.7K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
On a...
53.7K
Solubility
17.3K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
17.3K


