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Experimental study on the dynamics of droplet impacting on solid surface

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Abstract

An experimental visualization is undertaken to investigate the impact dynamic behaviors of water, absolute ethanol, and low surface energy droplets with different viscosities impacting on hydrophobic surfaces. Droplets’ impacting behaviors, including spreading, rebounding, and oscillation retraction, are observed and quantitatively characterized by transient spreading factor and maximum spreading diameter. Effects of droplet impact velocity, surface wettability, and droplet viscosity on the impact dynamics are explored and analyzed. As the droplet impact velocity increases, the droplet kinetic energy increases, resulting in an increase in the spreading factor and spreading velocity simultaneously. Hydrophobic surfaces are not easy to be wetted by water droplets due to their low surface energy, leading to the partial rebound of water droplets when impacting on the hydrophobic surfaces. However, this phenomenon does not occur when low surface energy droplets, such as absolute ethanol and simethicone, impact on hydrophobic surfaces at the same velocity. The increasing droplet viscosity enhances the viscous dissipation, slowing down the impact process and inhibiting the droplet spreading, oscillation, and retraction behaviors. Based on the energy conservation method, a universal model for the maximum spreading factor of low surface energy droplets with different viscosities impacting on hydrophobic surface was established. According to the experimental results, a new spreading time model tm = 2D0/U0 was proposed to enhance applicability of the model for low surface energy droplets with high viscosity, reducing the calculation error to less than 10%.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Author notes

  1. Jiangfeng Li and Chen Zhao have equally contributed to this work.

Authors and Affiliations

  1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China

    Jiangfeng Li, Chen Zhao & Chengyao Wang

Authors
  1. Jiangfeng Li
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  2. Chen Zhao
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  3. Chengyao Wang
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Contributions

JiangFeng Li and Chen Zhao designed and performed the experiments, interpreted results, and co-wrote the manuscript. Chengyao Wang supervised the work, reviewed, and edited the manuscript.

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Correspondence to Chengyao Wang.

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Li, J., Zhao, C. & Wang, C. Experimental study on the dynamics of droplet impacting on solid surface. Microfluid Nanofluid 27, 69 (2023). https://doi.org/10.1007/s10404-023-02680-1

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