Abstract
Molecular dynamics simulations (MDS) of single nanodroplet impinging vertically on the curved copper surface are performed to study dynamic performance. The effects of impact velocity, the potential depth between oxygen and copper atom, and substrate curvature play essential roles in the field of nanodroplet impingement. With the increase of impact velocity, different deformation patterns in impingement dynamics behaviors have been observed within specified tests. Here we show that the splash occurs during high-speed impact, and the nanodroplet with lower speed exhibits the advancing and receding processes. The potential depth, varying from partial wetting to non-wetting, affects spreading characteristics directly because the corresponding deformation patterns can be identified in terms of the variation of spreading factor. In addition, the substrate is the boundary of water molecular movement, and its curvature has an important influence on the change of the surface free energy. Moreover, the simulation results indicate that nanodroplet impacting on a substrate with larger curvature will easily emerge detached splash and reduce the static contact angle.
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Acknowledgements
The authors thank LAMMPS developers for the hard work.
This work was supported by the Natural Science Foundation of Anhui Province under Grant KJ2017A793; KJ2018ZD056.
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Yin, Z., Ding, Z., Ma, X. et al. Molecular Dynamics Simulations of Single Water Nanodroplet Impinging Vertically on Curved Copper Substrate. Microgravity Sci. Technol. 31, 749–757 (2019). https://doi.org/10.1007/s12217-019-9696-z
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DOI: https://doi.org/10.1007/s12217-019-9696-z