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Related Concept Videos

Capillarity in Fluid01:19

Capillarity in Fluid

1.4K
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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Capillary Exchange01:28

Capillary Exchange

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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...
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Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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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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Capillaries and Their Types01:20

Capillaries and Their Types

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Updated: Mar 13, 2026

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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Geometry-induced capillary emptying.

Carlos Rascón1, Andrew O Parry2, Dirk G A L Aarts3

  • 1Grupo Interdisciplinar de Sistemas Complejos, Departamento de Matemáticas, Universidad Carlos III de Madrid, 28911 Leganes, Spain; carlos.rascon@uc3m.es.

Proceedings of the National Academy of Sciences of the United States of America
|October 30, 2016
PubMed
Summary
This summary is machine-generated.

Liquid behavior in horizontal capillaries is unpredictable. This study introduces a precise mathematical criterion to determine if fluid flows out or remains, revealing counterintuitive outcomes for microfluidic device design.

Keywords:
Young–Laplace equationcapillaritycontact anglesurface tension

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Capillary action governs liquid behavior in narrow tubes.
  • Current criteria for liquid retention in horizontal capillaries are imprecise.
  • Standard assumptions about liquid flow in capillaries are insufficient for complex geometries.

Purpose of the Study:

  • To develop a precise mathematical criterion for liquid behavior in horizontal capillaries.
  • To investigate counterintuitive fluid dynamics in various capillary shapes.
  • To explore applications in sensitive microfluidic device design.

Main Methods:

  • Mathematical modeling of fluid-mechanics.
  • Analysis of capillary pressure and surface tension effects.
  • Simulation of liquid behavior in arbitrary cross-sectional shapes.

Main Results:

  • A novel mathematical criterion accurately predicts liquid retention or outflow.
  • The standard assumption for liquid behavior is shown to be inadequate for certain geometries.
  • Counterintuitive fluid dynamics, including sudden displacement, were observed.

Conclusions:

  • The new criterion offers precise prediction of liquid behavior in capillaries.
  • Findings challenge existing assumptions and reveal complex fluid dynamics.
  • Potential for developing novel, highly sensitive microfluidic devices without external pumps.