Drag Reduction in Turbulent Taylor-Couette Flow by Using Superhydrophobic Porous Patch

초록

Superhydrophobic surfaces have attracted considerable interest as a promising drag reduction strategy by forming an air layer at the interface in an underwater environment. Representatively, designing a 3D structure is advantageous for air capture, but it often suffers from instability and air-layer loss under high-speed turbulent conditions. Herein, we report a superhydrophobic porous patch with entangled pore networks that can effectively retain air bubbles while exhibiting uniform superhydrophobicity. We quantitatively evaluated the effect of reducing frictional drag in turbulent Taylor–Couette flow. Our results demonstrate the correlation between air-layer retention and drag reduction under turbulent flow, indicating potential for application in energy-efficient underwater operation systems.

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