Abstract
The impact of droplets on moving liquid surfaces is a ubiquitous phenomenon in nature and in industry. In the present study, we experimentally investigated the impinging process of a deionized water droplet on a shear-driven water film. A parameter study of the Weber number of the primary droplet and dimensionless moving water film thickness was carefully carried out. A high-speed camera was used to record the whole impact and splashing processes of the water droplet. The results showed that the shearing air could significantly change the crown morphology, causing the crown to tilt downstream. Besides, the droplet Weber number had a significant effect on the crown evolution. With the increase of the droplet Weber number, the spreading crown length, the maximum crown height, the upstream crown angle, and the number of secondary droplets increased. Besides, under the current experimental conditions, the moving water film thickness had a minor effect on the crown maximum height. Considering the influence of droplet Weber number and moving water film thickness, we proposed empirical correlations for the maximum upstream crown height and maximum downstream crown height. And the present empirical correlations agreed well with the experimental data.
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This study was supported by National Numerical Wind Tunnel Project (Grant No.: NNW2019ZT2-B26).
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Z.Y. contributed to investigation, methodology, experiments, data analysis, writing—original draft; B.Z. contributed to investigation, experimental setup; Z.J. contributed to supervision, methodology, writing, review and editing, project administration, funding acquisition; Z.Y. was involved in supervision, methodology; X.Y. was involved in funding acquisition; Y.D. was involved in project administration.
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Yang, Z., Zhou, B., Jin, Z. et al. Impingement of a water droplet onto a shear-driven water film. Exp Fluids 63, 186 (2022). https://doi.org/10.1007/s00348-022-03533-3
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DOI: https://doi.org/10.1007/s00348-022-03533-3