Abstract
The phenomenon that waterdrop impacts the elastic substrates exists widely in nature and industry. For example, raindrop impacts plant leaves. In this paper, an experimental apparatus is designed to investigate the phenomenon that waterdrop impacts cantilever plate. Both hydrophobic and hydrophilic surfaces are considered. High-speed camera is used to capture the dynamic process of waterdrop impact. We compared the max deformation of waterdrops and beams between results of hydrophobic and hydrophilic surfaces. It shows that the waterdrop morphologies and beam deflections are influenced by the wetting ability of the substrate. In additions, a fluid structure interaction model based on smoothed particle hydrodynamics method is developed for further revealing the highly dynamic impact behaviors. The surface tension effect is taken into account in the model, and the process of waterdrop impact is analyzed from the view of system energy. The research in this paper opens up a new research perspective for the physics of drop impact, and also provides an effective numerical method for the future application.
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