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Abstract <p>Bioinspired superhydrophobic surfaces have been used for drag reduction. However, the secondary structures and the air cushions on these surfaces could be destructed in a flow, losing the effect of drag reduction. Here, a stainless-steel surface with mushroom-like cross-section (SMC) and diamond cavities (SMC<sub>D</sub>) having a drag reduction rate up to 19.37% is developed by 3D printing. The concealed re-entrant structures in SMC<sub>D</sub> prevent the infiltration of water into the chamber and form gas cushions, which converts the sliding friction at liquid-solid interface into rolling friction at liquid-gas interface, realizing the drag reduction. Meanwhile, 98.3% of air can be maintained in the chamber in a flow with Reynolds number (<i>Re</i>) of 9 × 10<sup>5</sup>, ensuring the drag reduction in a high-velocity flow. Moreover, the continuous top stainless-steel surface and the supporting mesh network protect the critical re-entrant structures, ensuring the robustness of SMC. With the bioinspired design and one-step additive manufacturing process, SMC holds great potential for large-area production and applications requiring robust drag reduction.</p>

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Additive Manufactured, Bioinspired Stainless Steel Surface for Robust Drag Reduction

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Zhen Lin,
  • Peng Xu,
  • Junfei Huang,
  • Jinhong Zhang,
  • Xiaolong Zhang,
  • Lijun Li,
  • Yurong Zhang,
  • Ruteng Wang,
  • Xinping Long,
  • Yifeng Lei,
  • Changhui Song,
  • Daobing Chen,
  • Longjian Xue

摘要

Abstract

Bioinspired superhydrophobic surfaces have been used for drag reduction. However, the secondary structures and the air cushions on these surfaces could be destructed in a flow, losing the effect of drag reduction. Here, a stainless-steel surface with mushroom-like cross-section (SMC) and diamond cavities (SMCD) having a drag reduction rate up to 19.37% is developed by 3D printing. The concealed re-entrant structures in SMCD prevent the infiltration of water into the chamber and form gas cushions, which converts the sliding friction at liquid-solid interface into rolling friction at liquid-gas interface, realizing the drag reduction. Meanwhile, 98.3% of air can be maintained in the chamber in a flow with Reynolds number (Re) of 9 × 105, ensuring the drag reduction in a high-velocity flow. Moreover, the continuous top stainless-steel surface and the supporting mesh network protect the critical re-entrant structures, ensuring the robustness of SMC. With the bioinspired design and one-step additive manufacturing process, SMC holds great potential for large-area production and applications requiring robust drag reduction.