Superhydrophobic drag reduction in turbulent flows: a critical review
Superhydrophobic drag reduction in turbulent flows: a critical review
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DOI：
10.1007/s00348-021-03322-4
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发表时间：
2021-10
影响因子：
2.4
通讯作者：
Hyungmin Park;Chang‐Hwan Choi;C. Kim
中科院分区：
文献类型：
--
作者：
Hyungmin Park;Chang‐Hwan Choi;C. Kim
自2000年左右以来，超疏水（SHPo）表面一直受到大力研究，这在很大程度上是由于它们在没有任何能量或材料输入的情况下具有独特的流体动力学摩擦阻力减小潜力。到2010年左右，对层流的影响SHPo减阻的机制和关键因素已经有了相对较好的了解，正如之前所综述的那样[Lee et al. Exp Fluids 57：176（2016）]，但湍流的进展相当曲折。虽然自2010年左右以来，改进的流动测试使完全湍流中的正SHPo减阻更加规律，但仅在2020年才报道了在自然开放水域环境中的成功[Xu et al. Phys Rev Appl 13：034056（2020 b）]。在这篇文章中，我们回顾了文献中关于SHPo表面湍流流动的研究，重点是实验研究。我们总结了所获得的关键知识，包括湍流状态下的减阻机制，表面粗糙度形态的影响，以及胸甲的命运和作用。本文旨在指导SHPo表面在大尺度湍流场条件下的减阻设计和应用。
Superhydrophobic (SHPo) surfaces have been investigated vigorously since around 2000 due in large part to their unique potential for hydrodynamic frictional drag reduction without any energy or material input. The mechanisms and key factors affecting SHPo drag reduction have become relatively well understood for laminar flows by around 2010, as has been reviewed before [Lee et al. Exp Fluids 57:176 (2016)], but the progress for turbulent flows has been rather tortuous. While improved flow tests made positive SHPo drag reduction in fully turbulent flows more regular since around 2010, such a success in a natural, open water environment was reported only in 2020 [Xu et al. Phys Rev Appl 13:034056 (2020b)]. In this article, we review studies from the literature about turbulent flows over SHPo surfaces, with a focus on experimental studies. We summarize the key knowledge obtained, including the drag-reduction mechanism in the turbulent regime, the effect of the surface roughness morphology, and the fate and role of the plastron. This review is aimed to help guide the design and application of SHPo surfaces for drag reduction in the large-scale turbulent flows of field conditions.Graphic abstract