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Related Concept Videos

Drag01:23

Drag

181
Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number,...
181

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Preparation of a bionic lotus leaf microstructured surface and its drag reduction performance.

Huan Wang1,2, Guihang Luo1, Lei Chen1

  • 1College of Engineering, Shenyang Agricultural University Shenyang 110866 P. R. China wly78528@syau.edu.cn.

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Researchers created a large-scale lotus leaf-inspired surface to reduce drag. This bionic surface achieved a 6.29% drag reduction rate, enhancing energy efficiency for potential underwater vehicle applications.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Engineering

Background:

  • Reducing friction resistance on machinery surfaces is crucial for improving energy utilization efficiency.
  • The lotus leaf exhibits remarkable self-cleaning and hydrophobic properties, serving as inspiration for biomimetic designs.
  • Drag reduction is a key factor in enhancing the performance and efficiency of underwater vehicles.

Purpose of the Study:

  • To prepare a large-area bionic surface inspired by the lotus leaf.
  • To investigate the drag reduction performance of this bionic surface using numerical simulation and experimental analysis.
  • To provide a theoretical foundation for designing bionic drag reduction surfaces for practical applications.

Main Methods:

  • Fabrication of a large-area lotus leaf-like bionic surface.
  • Numerical simulation to analyze fluid-surface interactions.
  • Experimental analysis including drag force measurements and droplet rolling tests.
  • Measurement of surface free energies for both bionic and smooth surfaces.

Main Results:

  • The bionic surface demonstrated a maximum drag reduction rate of 6.29% at a velocity of 3 m/s.
  • The liquid-surface contact state transitioned from Cassie to Wenzel state with increasing water flow velocity.
  • Surface free energy was significantly reduced on the bionic surface (1.09 mJ m⁻²) compared to a smooth surface (14.26 mJ m⁻²).
  • Droplet rolling behavior changed from hemispherical on a smooth surface to ellipsoidal on the bionic surface.

Conclusions:

  • The lotus leaf-inspired bionic surface effectively reduces drag, offering significant potential for energy savings.
  • The observed changes in contact state and droplet morphology correlate with drag reduction performance.
  • This research provides a valuable theoretical basis for the development of advanced bionic drag reduction surfaces for underwater vehicles.