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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

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.
Surface Tension of Fluid01:22

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...
Capillarity in Fluid01:19

Capillarity in Fluid

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...
Hydraulic Jump01:29

Hydraulic Jump

A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...

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相关实验视频

Updated: Jul 14, 2026

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
10:09

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

跳跃的纳米液滴可以跳跃.

A Habenicht1, M Olapinski, F Burmeister

  • 1Department of Physics, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.

Science (New York, N.Y.)
|September 24, 2005
PubMed
概括

激光脉冲融化了平面黄金纳米结构,导致它们迅速收缩成球体. 这种快速的湿过程可以以高速速度将纳米颗粒从表面发射出来.

科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 激光物理 激光物理

背景情况:

  • 纳米结构的制造通常涉及基板上的薄膜.
  • 激光诱导的过程可以改变材料的特性和形态.
  • 了解化纳米粒子的动态行为对于应用至关重要.

研究的目的:

  • 研究激光化金纳米结构的动态行为.
  • 分析露水和收缩过程.
  • 确定纳米粒子脱离和速度的潜力.

主要方法:

  • 用单个强烈的激光脉冲照明平面黄金纳米结构.
  • 在惰性基板 (玻璃,石墨) 上观察结构变化.
  • 在纳米秒内分析液体收缩和质量中心运动.

主要成果:

  • 在黄金化值以上的激光流动引发了液态结构.
  • 一个快速的潮湿过程导致在纳米秒内球形收缩.
  • 收缩期间的惯性效应导致质量中心向上运动.
  • 观察到滴滴的分离,100纳米半径的滴滴的速度高达10m/s.

更多相关视频

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
08:39

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

Published on: October 16, 2017

相关实验视频

Last Updated: Jul 14, 2026

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
10:09

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
08:39

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

Published on: October 16, 2017

结论:

  • 激光诱导的融和湿提供了一条通往动态纳米粒子重塑的途径.
  • 该过程可以导致纳米颗粒从基板中能量分离.
  • 实现的高速度表明了纳米粒子操纵和沉积的潜力.