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Drag-reducing riblets with fouling-release properties: development and testing.

H O G Benschop1, A J Guerin2, A Brinkmann3

  • 1a Laboratory for Aero and Hydrodynamics , Delft University of Technology , Delft , the Netherlands.

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|May 29, 2018
PubMed
Summary
This summary is machine-generated.

Modified marine coatings with riblet textures offer up to 6% drag reduction. While initial diatom adhesion increased, overall biofilm release remained unaffected, indicating potential for improved ship performance.

Keywords:
Intersleek®Riblet textureantifoulingbiofilm releasedrag reductionmarine coatings

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Area of Science:

  • Marine engineering
  • Surface science
  • Biotechnology

Background:

  • Marine biofouling increases drag and fuel consumption on ships.
  • Fouling-release coatings aim to minimize biofouling adhesion.
  • Riblet textures are known to reduce hydrodynamic drag.

Purpose of the Study:

  • To develop and test a novel riblet-textured coating with fouling-release properties.
  • To evaluate the drag reduction and fouling resistance of the modified coating.
  • To assess the impact of riblets on marine organism settlement and biofilm formation.

Main Methods:

  • Modification of Intersleek® 1100SR fouling-release coating using embossing technology to create riblet textures.
  • Hydrodynamic drag measurements using a Taylor-Couette setup.
  • Barnacle settlement assays (Balanus amphitrite cyprids).
  • Diatom adhesion and flow exposure tests.
  • Biofilm assessment on statically immersed and flow-exposed panels.

Main Results:

  • The riblet-textured coating achieved up to 6% hydrodynamic drag reduction compared to a smooth surface.
  • Barnacle settlement was not significantly affected by the riblet texture.
  • Initial diatom attachment was higher on riblets, but final cell density after flow exposure was similar to smooth surfaces.
  • Biofilm cover increased on statically immersed panels with riblets, but biofilm release was largely unaffected.

Conclusions:

  • The developed riblet-textured coating demonstrates drag reduction potential.
  • The riblet texture had a limited negative impact on fouling-release properties against barnacles and flow-exposed diatoms.
  • Further research is needed to optimize riblet design for enhanced fouling control alongside drag reduction.