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Numerical investigation of relationship between water contact angle and drag reduction ratio of superhydrophobic surfaces

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Abstract

This paper proposes a novel bubble model to analyze drag reduction. The relationship between the slip length and air bubble height is discussed. The numerical relationship between the surface contact angle and slip length is obtained using the solid-liquid contact ratio in the Cassie equation. The surface drag reduction ratio increases by 40% at low velocities when the solid liquid contact ratio decreases from 90% to 10%. An experimental setup to study liquid/solid friction drag is reported. The drag reduction ratio for the superhydrophobic surface tested experimentally is 30%–35% at low velocities. These results are similar to the simulation results obtained at low velocities.

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Authors and Affiliations

  1. MEMS Center, Harbin Institute of Technology, Harbin, 150001, China

    Liang Yin, Hai-Feng Zhang, Shu-Yuan Shi, Yao Lu, Yang Wang & Xiao-Wei Liu

  2. Key Laboratory of Micro-Systems and Micro-Structures Manufacturing (Ministry of Education), Harbin, 150001, China

    Hai-Feng Zhang & Xiao-Wei Liu

Authors
  1. Liang Yin
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  2. Hai-Feng Zhang
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  3. Shu-Yuan Shi
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  4. Yao Lu
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  5. Yang Wang
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  6. Xiao-Wei Liu
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Correspondence to Hai-Feng Zhang.

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Yin, L., Zhang, HF., Shi, SY. et al. Numerical investigation of relationship between water contact angle and drag reduction ratio of superhydrophobic surfaces. Front. Phys. 11, 114701 (2016). https://doi.org/10.1007/s11467-015-0546-1

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  • DOI: https://doi.org/10.1007/s11467-015-0546-1

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