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Kinetic drop friction

Author

Listed:
  • Xiaomei Li

    (Max Planck Institute for Polymer Research)

  • Francisco Bodziony

    (Technische Universität Darmstadt)

  • Mariana Yin

    (Technische Universität Darmstadt)

  • Holger Marschall

    (Technische Universität Darmstadt)

  • Rüdiger Berger

    (Max Planck Institute for Polymer Research)

  • Hans-Jürgen Butt

    (Max Planck Institute for Polymer Research)

Abstract

Liquid drops sliding on tilted surfaces is an everyday phenomenon and is important for many industrial applications. Still, it is impossible to predict the drop’s sliding velocity. To make a step forward in quantitative understanding, we measured the velocity $$(U)$$ ( U ) , contact width $$(w)$$ ( w ) , contact length $$(L)$$ ( L ) , advancing $$({\theta }_{{{{{{\rm{a}}}}}}})$$ ( θ a ) , and receding contact angle $$({\theta }_{{{{{{\rm{r}}}}}}})$$ ( θ r ) of liquid drops sliding down inclined flat surfaces made of different materials. We find the friction force acting on sliding drops of polar and non-polar liquids with viscosities ( $${\eta }$$ η ) ranging from 10−3 to 1 $${{{{{\rm{Pa}}}}}}\cdot {{{{{\rm{s}}}}}}$$ Pa ⋅ s can empirically be described by $${F}_{{{{{{\rm{f}}}}}}}(U)={F}_{0}+\beta w\eta U$$ F f ( U ) = F 0 + β w η U for a velocity range up to 0.7 ms−1. The dimensionless friction coefficient $$(\beta )$$ ( β ) defined here varies from 20 to 200. It is a material parameter, specific for a liquid/surface combination. While static wetting is fully described by $${\theta }_{{{{{{\rm{a}}}}}}}$$ θ a and $${\theta }_{{{{{{\rm{r}}}}}}}$$ θ r , for dynamic wetting the friction coefficient is additionally necessary.

Suggested Citation

  • Xiaomei Li & Francisco Bodziony & Mariana Yin & Holger Marschall & Rüdiger Berger & Hans-Jürgen Butt, 2023. "Kinetic drop friction," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40289-8
    DOI: 10.1038/s41467-023-40289-8
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    References listed on IDEAS

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    1. Jaakko V. I. Timonen & Mika Latikka & Olli Ikkala & Robin H. A. Ras, 2013. "Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity," Nature Communications, Nature, vol. 4(1), pages 1-9, December.
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    Cited by:

    1. Ze-Qi Lu & Long Zhao & Hai-Ling Fu & Eric Yeatman & Hu Ding & Li-Qun Chen, 2024. "Ocean wave energy harvesting with high energy density and self-powered monitoring system," Nature Communications, Nature, vol. 15(1), pages 1-14, December.

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