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Drop on a bent fibre.

Zhao Pan1, Floriane Weyer, William G Pitt

  • 1Splash Lab, Mechanical and Aerospace Engineering, Utah State University, Logan, UT 84322, USA. panzhao0417@gmail.com taddtruscott@gmail.com.

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Summary

Bent fibers can hold over three times more water than horizontal ones, with an optimal angle of ~36° for maximum liquid trapping. This finding aids microfluidic and fog harvesting device design.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Nature-inspired droplet adhesion on plant surfaces.
  • Capillary forces governing liquid behavior on solid substrates.

Purpose of the Study:

  • Investigate liquid retention in bent fibers.
  • Determine the optimal fiber bending angle for maximum water holding.
  • Develop models to explain and predict liquid trapping phenomena.

Main Methods:

  • Experimental measurements of liquid volume on bent fibers.
  • Systematic variation of fiber bending angles and liquid surface tension.
  • Development of analytical and semi-empirical models.

Main Results:

  • Bent fibers retain significantly more liquid (up to 3x) compared to horizontal fibers.
  • Optimal liquid retention occurs at a specific included fiber angle of approximately 36°.
  • Liquid volume is dependent on fiber geometry and liquid surface tension.

Conclusions:

  • Fiber bending dramatically enhances liquid trapping capacity.
  • The identified optimal angle provides a design principle for efficient liquid handling.
  • Findings are applicable to the development of microfluidic devices and fog harvesting technologies.