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Effects of contact angle hysteresis on ice adhesion and growth on superhydrophobic surfaces under dynamic flow conditions

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Abstract

In this paper, the icephobic properties of superhydrophobic surfaces are investigated under dynamic flow conditions using a closed-loop low-temperature wind tunnel. Superhydrophobic surfaces were prepared by coating aluminum and steel substrate plates with nano-structured hydrophobic particles. The superhydrophobic plates, along with uncoated controls, were exposed to a wind tunnel air flow of 12 m/s and −7 °C with deviations of ±1 m/s and ±2.5 °C, respectively, containing micrometer-sized (∼50 μm in diameter) water droplets. The ice formation and accretion were observed by CCD cameras. Results show that the superhydrophobic coatings significantly delay ice formation and accretion even under the dynamic flow condition of highly energetic impingement of accelerated supercooled water droplets. It is found that there is a time scale for this phenomenon (delay in ice formation) which has a clear correlation with contact angle hysteresis and the length scale of the surface roughness of the superhydrophobic surface samples, being the highest for the plate with the lowest contact angle hysteresis and finest surface roughness. The results suggest that the key for designing icephobic surfaces under the hydrodynamic pressure of impinging droplets is to retain a non-wetting superhydrophobic state with low contact angle hysteresis, rather than to only have a high apparent contact angle (conventionally referred to as a “static” contact angle).

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Acknowledgments

This research was sponsored by the U.S. Department of Energy (DOE), Office of Electricity Delivery and Energy Reliability, Advanced Cables and Conductors Program, Contract DE-AC05-00OR22725 and DOE Award No. NFE-08-01911.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, 07050, USA

    Mohammad Amin Sarshar, Christopher Swarctz & Chang-Hwan Choi

  2. Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Scott Hunter & John Simpson

Authors
  1. Mohammad Amin Sarshar
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  2. Christopher Swarctz
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  3. Scott Hunter
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  4. John Simpson
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  5. Chang-Hwan Choi
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Corresponding author

Correspondence to Chang-Hwan Choi.

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This article is part of the Topical Collection on Contact Angle Hysteresis

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Sarshar, M.A., Swarctz, C., Hunter, S. et al. Effects of contact angle hysteresis on ice adhesion and growth on superhydrophobic surfaces under dynamic flow conditions. Colloid Polym Sci 291, 427–435 (2013). https://doi.org/10.1007/s00396-012-2753-4

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  • DOI: https://doi.org/10.1007/s00396-012-2753-4

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