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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

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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

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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...
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Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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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.
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由毛细管上升引起的波动在干燥聚合物溶液薄膜中的球形粒子上.

Gabrielle Di Mauro1, Alice Etienne-Simonetti2, Bertrand Heurtefeu3

  • 1CNRS, Surface du Verre et Interfaces, Saint-Gobain, 93300 Aubervilliers, France.

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概括

干燥聚合物薄膜中的毛细血管升起形成粘性毛细血管,其动态与滑理论相匹配,具有有效时间. 二次波纹与阴囊体积相关,表明流动驱动的聚合物积累.

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科学领域:

  • 流体动力学 流体动力学
  • 材料科学是一种材料科学.
  • 表面科学是一门科学.

背景情况:

  • 毛细血管升起是流体力学的一个基本现象.
  • 在聚合物溶液中的干燥过程涉及复杂的流体流和材料沉积.
  • 了解毛细管力和干燥动力学之间的相互作用对于材料加工至关重要.

研究的目的:

  • 为了研究在干燥聚合物溶液膜中毛细血管升高期间的流体动力学.
  • 描述在这个过程中观察到的波纹的形成和动态.
  • 为了将波纹特征与聚合物薄膜和半径的干燥引起的变化相关联.

主要方法:

  • 一个玻璃球与干燥聚合物溶液薄膜接触的实验设置.
  • 观察和分析粘性毛细血管的形成和传播.
  • 滑理论应用于模拟波纹动态,并纳入有效时间参数.
  • 二次波纹幅度和半阴体体积之间的相关性分析.

主要成果:

  • 一个粘性毛细血管最初形成并传播,直到它凝固.
  • 波纹的动态和最终位置与有效时间使用时的滑理论预测保持一致.
  • 在后期阶段出现了次级波纹,其幅度取决于阴茎体积.
  • 有证据表明,二次波纹形成是由干燥半月体内的流动驱动的.

结论:

  • 这项研究阐明了在干燥聚合物薄膜中毛细血管上升的动态.
  • 滑理论,经过干燥效应的修改,准确地描述了早期的波纹行为.
  • 晚期波纹形成与阴囊驱动的流动有关,并导致聚合物积累.