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Equilibrium distances for the capillary interaction between floating objects.

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Floating objects interacting at a water surface exhibit complex attraction and repulsion. Equilibrium distances emerge due to liquid deformations, influenced by wetting conditions and capillary charge.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Soft matter physics

Background:

  • Interactions between floating objects are driven by liquid interface deformations.
  • Existing models often assume only attraction between similarly deforming interfaces.

Purpose of the Study:

  • To investigate the complex attractive and repulsive interactions between floating objects.
  • To determine the factors influencing equilibrium distances at the water-air interface.

Main Methods:

  • Development of a 1D model simulating capillary interactions between vertical plates in water.
  • Analysis of the role of wetting conditions in interaction behavior.
  • Derivation of an equation for equilibrium distance based on capillary charge ratio.

Main Results:

  • Demonstrated coexistence of attraction and repulsion at different ranges for objects with constant height.
  • Identified wetting conditions as a critical factor in interaction dynamics.
  • Established a relationship between equilibrium distance and the logarithm of the capillary charge ratio.

Conclusions:

  • The interaction between floating objects is more complex than previously assumed, featuring both attraction and repulsion.
  • A general equation for equilibrium distance was proposed and experimentally validated.
  • Capillary charge and wetting conditions are key parameters governing these interactions.