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Related Experiment Video

Updated: Mar 9, 2026

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Separation control over a grooved surface inspired by dolphin skin.

Amy W Lang1, Emily M Jones, Farhana Afroz

  • 1Department of Aerospace Engineering and Mechanics, University of Alabama, 255 H M Comer, 245 7th Avenue, Box 870280, Tuscaloosa, AL 35487, United States of America.

Bioinspiration & Biomimetics
|January 7, 2017
PubMed
Summary
This summary is machine-generated.

Transverse grooves, inspired by dolphin skin, were tested for drag reduction. These grooves effectively controlled flow separation in turbulent boundary layers, offering potential for hydrodynamic drag reduction.

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Area of Science:

  • Fluid dynamics
  • Hydrodynamics
  • Bio-inspired engineering

Background:

  • Aquatic swimmer surfaces are studied for drag reduction.
  • Riblets (parallel grooves) are known for hydrodynamic benefits.
  • Dolphin skin features transverse grooves, unlike parallel riblets.

Purpose of the Study:

  • Investigate the hydrodynamic effects of transverse grooves, mimicking dolphin skin.
  • Test the hypothesis that transverse grooves reduce flow separation and pressure drag.
  • Analyze the impact of groove shape (rectangular, sinusoidal) on boundary layer flow.

Main Methods:

  • Induced an adverse pressure gradient on a flat plate to create flow separation.
  • 3D printed and mounted transverse grooves (rectangular and sinusoidal).
  • Used digital particle image velocimetry (DPIV) to measure boundary layer flow.
  • Varied the adverse pressure gradient strength.

Main Results:

  • Transverse grooves demonstrated control over flow separation.
  • Observed effects on the turbulent boundary layer were analyzed.
  • Comparison made between grooved surfaces and a smooth flat plate.

Conclusions:

  • Transverse grooves show potential for managing flow separation.
  • The findings support the hypothesis of turbulence augmentation and drag reduction.
  • Bio-inspired transverse grooves offer a novel approach to hydrodynamic drag reduction.