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Related Concept Videos

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...
Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...

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Anisotropic imbibition on surfaces patterned with polygonal posts.

M L Blow1, J M Yeomans

  • 1The Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK. matthewlblow@gmail.com

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

Lattice Boltzmann simulations reveal anisotropic film spreading on patterned surfaces. The direction of film advance influences pinning and depinning, altering spreading behavior.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Understanding fluid behavior on patterned surfaces is crucial for microfluidics and material design.
  • Surface topography significantly influences wetting and spreading dynamics.

Purpose of the Study:

  • To investigate the spreading dynamics of thick films on surfaces patterned with polygonal posts.
  • To elucidate the mechanisms of pinning and depinning during film advance.
  • To determine the conditions leading to anisotropic spreading.

Main Methods:

  • Utilizing lattice Boltzmann simulations to model thick film spreading.
  • Analyzing the influence of surface post geometry on fluid-structure interactions.
  • Quantifying spreading behavior across different directions of advance.

Main Results:

  • The study reveals distinct pinning and depinning mechanisms depending on the direction of film advance.
  • Anisotropic spreading behavior is observed within a specific range of material contact angles.
  • Polygonal post geometry dictates the degree of directional spreading dependence.

Conclusions:

  • Film spreading on patterned surfaces is direction-dependent due to varying pinning/depinning mechanisms.
  • Surface patterning offers a route to control and engineer anisotropic wetting.
  • Lattice Boltzmann simulations provide valuable insights into complex fluid-surface interactions.