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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...
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, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Interplay between shape and roughness in early-stage microcapillary imbibition.

Salvatore Girardo1, Silvia Palpacelli, Alessandro De Maio

  • 1National Nanotechnology Laboratory of the Consiglio Nazionale della Ricerche-Istituto Nanoscienze, Università del Salento, via Arnesano, I-73100 Lecce, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 19, 2012
PubMed
Summary

Microchannel capillary flow is affected by nanoscopic roughness, deviating from the Lucas-Washburn law. A two-scale phenomenon involving global shape and wall geometry controls front propagation, impacting microfluidic device design.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Capillary imbibition is crucial in applications like oil recovery, inkjet printing, and biomedical devices.
  • The Lucas-Washburn (LW) law describes spontaneous capillary flow but simplifies real-world conditions.
  • Modern microfluidics challenges LW law assumptions due to small scales and complex geometries.

Purpose of the Study:

  • To investigate the impact of nanoscopic roughness and global shape on microchannel capillary flow.
  • To understand deviations from the Lucas-Washburn law in early-stage front propagation.
  • To identify novel mechanisms governing fluid dynamics in corrugated microchannels.

Main Methods:

  • Advanced experimental techniques.
  • Computational simulations.
  • Combined experimental and simulation approaches.

Main Results:

  • A novel interplay between global shape and nanoscopic roughness was discovered.
  • This interplay significantly influences the early-stage energy budget of capillary flow.
  • A two-scale phenomenon was identified, where small-scale structures probe nanocorrugations, leading to increased friction and slowed front propagation.

Conclusions:

  • The findings challenge the universality of the Lucas-Washburn law in complex microchannels.
  • A two-scale mechanism explains dissipative phenomena in capillary flows with nanocorrugated walls.
  • This research offers insights for designing advanced microfluidic devices.