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Inspired by coral, this study introduces an active self-cleaning surface with flexible sweepers. These sweepers effectively remove strong contaminants (>30 kPa) from underwater surfaces using hydrodynamic forces and dynamic buckling for efficient fouling removal.

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filament sweeperfluid-structure couplinghydrodynamic energyself-cleaning

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Biomimetics

Background:

  • Hydrodynamic forces offer a promising fouling-release strategy for underwater surfaces.
  • The no-slip condition in the viscous sublayer significantly reduces hydrodynamic forces, limiting practical applications.
  • Existing self-cleaning surfaces often struggle with strong contaminant adhesion.

Purpose of the Study:

  • To develop an active self-cleaning surface inspired by coral sweeper tentacles.
  • To overcome the limitations of reduced hydrodynamic forces in the viscous sublayer.
  • To investigate the efficiency of flexible filament-like sweepers in removing adhered contaminants.

Main Methods:

  • Fabrication of a novel self-cleaning surface with flexible filament-like sweepers.
  • Utilizing fluid-structure coupling and energy from outer turbulent flows to activate sweepers.
  • Testing contaminant removal efficiency under oscillating flow conditions.
  • Analyzing the dynamic buckling movements of individual sweepers and coordinated array behavior.

Main Results:

  • The flexible sweepers can penetrate the viscous sublayer and remove contaminants with adhesion strength exceeding 30 kPa.
  • A single sweeper achieves a removal rate of up to 99.5% through dynamic buckling under oscillating flow.
  • An array of sweepers can completely clean its coverage area within 10 seconds via coordinated symplectic wave movements.

Conclusions:

  • The developed active self-cleaning surface effectively utilizes hydrodynamic forces for contaminant removal, overcoming viscous sublayer limitations.
  • The biomimetic design, inspired by coral, offers a novel and efficient approach to fouling-release strategies.
  • This fluid-structure coupling mechanism represents a paradigm shift from conventional self-cleaning surface concepts.