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相关概念视频

Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

1.8K
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.
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Capillarity in Fluid01:19

Capillarity in Fluid

176
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...
176
Adhesion01:14

Adhesion

39.9K
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
39.9K
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

27.7K
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...
27.7K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

172
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
172
Excess Pressure Inside a Drop and a Bubble01:13

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

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相关实验视频

Updated: Jun 23, 2025

Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry
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Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry

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不平行墙壁之间的毛细血管凝结.

Alexandr Malijevský1, Jiří Janek2

  • 1Research Group of Molecular Modelling, The Czech Academy of Sciences, Institute of Chemical Process Fundamentals, 165 02 Prague, Czech Republic and Department of Physical Chemistry, University of Chemical Technology Prague, 166 28 Prague, Czech Republic.

Physical review. E
|June 22, 2024
PubMed
概括
此摘要是机器生成的。

这项研究揭示了封闭流体中的两种凝结类型:单针和双针. 一个相位图显示了一个回流现象,其中凝结类型随着墙壁倾斜而变化.

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科学领域:

  • 物理 物理学 物理
  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 在有限几何体中,流体的行为对于理解从工业过程到生物系统的现象至关重要.
  • 毛细管凝结,在小孔或空隙中形成液体,受表面几何和流体特性的影响.
  • 非平行封闭引入了在平行系统中没有观察到的独特的接口效应.

研究的目的:

  • 为了研究在高度有限的非平行板之间被限制的流体中的不同类型的毛细血管凝结.
  • 根据边缘接触角度来描述这些凝结现象,称为单和双,基于边缘接触角度.
  • 为了确定每个凝结类型的条件,并探索系统的相位行为.

主要方法:

  • 一个类似凯尔文方程的表述,适用于单针和双针凝结.
  • 构建一个全局相位图来映射凝结模式.
  • 分析非对称性属性和凝结状态之间的过渡的性质.

主要成果:

  • 确定两种凝结模式:单钉和双钉,通过边缘接触角度进行区分.
  • 开发一个相位图,展示一个回流现象,其中凝结类型随着墙壁倾斜而变化.
  • 证明单针和双针状态之间的过渡是连续的,并取决于墙壁的湿性质.

结论:

  • 这项研究提供了对非平行封闭中的毛细血管凝结的全面了解.
  • 这些发现揭示了复杂的相位行为,包括重新进入,受到几何和表面特性的影响.
  • 这项工作为各种科学和工程应用相关的接口现象提供了洞察力.