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Droplet Helical Motion on Twisted Fibers.

J Van Hulle1, C Delforge1, M Leonard1

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Droplet motion on twisted fibers is dictated by fiber helix structure and droplet size. Changing fiber twists manipulates this complex helical and sliding motion for fiber-based devices.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Surface science

Background:

  • Droplet dynamics on structured surfaces are crucial for microfluidics and material applications.
  • Vertically twisted fibers present unique topographical features influencing fluid behavior.

Purpose of the Study:

  • To investigate the effect of helical structures on asymmetrical droplet motion along vertically twisted fibers.
  • To understand how droplet size relative to fiber pitch influences motion dynamics.
  • To develop a model predicting droplet speeds based on fiber twist parameters.

Main Methods:

  • Experimental observation of droplet motion on twisted fibers.
  • Parametric variation of fiber twist and droplet size.
  • Development of a theoretical model correlating speeds with fiber geometry.

Main Results:

  • Droplets exhibit helical motion around fibers, driven by gravity.
  • Droplet motion transitions from predominantly helical to mixed sliding-helical as droplet size increases relative to helix pitch.
  • A model successfully describes rotational and linear speeds based on fiber twist turns.

Conclusions:

  • Fiber substructures, specifically helical twists, significantly impact droplet dynamics.
  • Droplet size relative to helix pitch is a critical factor in determining motion patterns.
  • Findings offer insights for designing advanced fiber-based devices for droplet manipulation.