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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...
Capillary Beds01:20

Capillary Beds

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,...
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.
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.
Capillaries and Their Types01:20

Capillaries and Their Types

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, with...
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

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Updated: Jul 3, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
10:17

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Capillary filling in patterned channels.

H Kusumaatmaja1, C M Pooley, S Girardo

  • 1Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 23, 2008
PubMed
Summary
This summary is machine-generated.

Microchannel surface patterns significantly impact capillary filling. Perpendicular ridges impede flow, while parallel ridges can enhance it, depending on liquid properties and surface geometry.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Surface science

Background:

  • Capillary filling is crucial for microfluidic devices.
  • Surface topography can influence fluid behavior in microchannels.
  • Understanding these interactions is key for optimizing microfluidic applications.

Purpose of the Study:

  • To investigate the effect of microchannel surface features on capillary filling.
  • To analyze how different post and ridge geometries influence liquid front advancement.
  • To determine the role of equilibrium contact angle in these interactions.

Main Methods:

  • Fabrication of microchannels with varying surface patterns (posts, perpendicular ridges, parallel ridges).
  • Experimental observation of capillary filling dynamics using different liquids.
  • Analysis of liquid front pinning and filling rates in relation to surface topography and contact angles.

Main Results:

  • Ridges perpendicular to flow direction cause contact line pinning, hindering or preventing filling.
  • Ridges parallel to flow offer increased surface area, potentially enhancing filling.
  • Square posts have minimal impact on filling for contact angles below 30 degrees.
  • For contact angles above 60 degrees, even sparse posts can significantly pin the liquid front.

Conclusions:

  • Microchannel surface topography, specifically ridge orientation, plays a critical role in capillary filling.
  • The effectiveness of surface modifications is highly dependent on the liquid's equilibrium contact angle.
  • Strategic patterning of microchannels can be used to control or enhance capillary-driven fluid transport.