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Research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces

  • Special Column on the 34th NCHD (Guest Editor Zheng Ma)
  • Published:
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Abstract

The biomimetic hydrophobic surface is a potentially efficient underwater drag reduction method and the drag reduction mechanism of this kind of surface comes from the interfacial slippage. For now, it is a hotspot to grasp the slippage characteristic and explore slippage enhancement strategies. This paper not only summarizes our numerical simulation and experimental results of slippage characteristic at the solid-liquid interface (SLI) of hydrophobic surfaces (HS) and the gas-liquid interface (GLI) of superhydrophobic surfaces (SHS) in recent years, but also introduces some innovative methods that can effectively improve the gas film stability and drag reduction effect of SHS. First, we used the molecular dynamics (MD) simulation method to figure out the effect of the solid-liquid interaction strength, the system temperature and the shear rate on the slippage of SLI, and expound their action mechanism from molecular scale. Then, by MD and multibody dissipative particle dynamics (MDPD) method, the slippage behavior at the GLI was studied under the influence of the microstructure size and the flow driving velocity. We proposed a new kind of hybrid slip boundary condition model to describe the slippage characteristic on GLI. In addition, we found through experiment that a three-dimensional backflow will appear on the GLI under the interfacial adsorption of surfactants, and the backflow direction will reverse with the change of GLI morphology. Finally, we put forward the wettability step structure and gas injection method to enhance the stability and drag reduction effect of the gas film on SHS.

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Acknowledgements

This work was supported by the Shenzhen Science and Technology Program (Grant No. JCYJ20210324122201004), the Qinchuangyuan high-level innovative and entrepreneurial talents introduction plan (Grant No. QCYRCXM-2022-125).

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Authors and Affiliations

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, 710072, China

    Meng-zhuo Zhang, Hai-bao Hu, Liu-zhen Ren, Lu-yao Bao, Jun Wen & Luo Xie

  2. Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518063, China

    Hai-bao Hu & Jun Wen

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  1. Meng-zhuo Zhang
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  2. Hai-bao Hu
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  3. Liu-zhen Ren
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Correspondence to Jun Wen.

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Conflict of interest: The authors declare that they have no conflict of interest. Hai-bao Hu, Jun Wen and Luo Xie are editorial board members for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

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Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 52071272, 52201382 and 12102358).

Biography: Meng-zhuo Zhang (1996-), Male, Ph. D. Candidate

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Zhang, Mz., Hu, Hb., Ren, Lz. et al. Research progress of slippage characteristic and gas film stability enhancement methods on biomimetic hydrophobic surfaces. J Hydrodyn 36, 87–101 (2024). https://doi.org/10.1007/s42241-024-0004-z

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  • DOI: https://doi.org/10.1007/s42241-024-0004-z

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