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Related Concept Videos

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...
Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Characteristics of Fluids01:31

Characteristics of Fluids

Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
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.
Couette Flow01:22

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
Capillary Exchange01:28

Capillary Exchange

The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular clefts.

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Related Experiment Video

Updated: Jun 2, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
12:26

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Capillary waves of compressible fluids.

Kerstin Falk1, Klaus Mecke

  • 1Institut für Theoretische Physik, Universität Erlangen-Nürnberg, Erlangen, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 22, 2011
PubMed
Summary

Thermal noise and molecular forces create unique liquid behaviors at the nanoscale. Researchers discovered novel acoustic-capillary waves in compressible fluids, differing from standard capillary waves.

Area of Science:

  • Fluid dynamics
  • Nanoscale science
  • Surface physics

Background:

  • Liquid behavior at sub-micrometer scales exhibits unique phenomena due to thermal noise and molecular forces.
  • Surface tension and capillary wave dispersion relations deviate from macroscopic predictions at the nanoscale.
  • Nanoscopic thin liquid films display faster dewetting than predicted by classical hydrodynamics.

Purpose of the Study:

  • To investigate the coupling between capillary waves and acoustic surface waves in compressible fluids.
  • To understand the nanoscale behavior of liquids, particularly at interfaces.
  • To explore deviations from traditional hydrodynamic predictions at the nanoscale.

Main Methods:

  • Utilizing the stochastic Navier-Stokes equation for analysis.

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Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes
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Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

Published on: January 27, 2017

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
07:08

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

Related Experiment Videos

Last Updated: Jun 2, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
12:26

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes
07:06

Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes

Published on: January 27, 2017

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
07:08

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

  • Studying the interplay of thermal noise and molecular forces.
  • Investigating wave propagation in compressible fluids.

    • Main Results:

    • Identified propagating 'acoustic-capillary waves' at nanometer wavelengths.
    • Demonstrated that this coupling is possible in compressible fluids.
    • Observed that these waves differ from the overdamped capillary waves found in incompressible fluids.

    Conclusions:

    • Acoustic-capillary waves represent a novel phenomenon at the nanoscale in compressible liquids.
    • The findings challenge conventional understanding of capillary waves at small length scales.
    • This research opens new avenues for studying fluid dynamics at the nanoscale.