Thu May 8th 2014
Seminar The impact of raindrops on sand
SongChuan Zhao, Rianne de Jong


The impact of a liquid droplet on a layer of grains is very common in nature, agriculture and industry. In spite of its ubiquity and relevance, little is known about the physics that governs it. A target consisting of a granular layer, in contrast to a solid or liquid pool, is more complicated, since granular materials can show both liquid-like and solid-like behavior. High speed profiling is our main tool to investigate the dynamics of the crater formation during the impact. After the impact, we scan the crater to obtain a full 3D crater profile.
By varying the experimental parameters, e.g., impact speed and the packing density of the substrate, we observed that the crater dimensions (especially its depth) and the amount of mixing of grains and liquid are dramatically changed. Relevant time scales are studied and used to understand various crater morphologies.
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The 10th Complex Motion in Fluids 2021
Max Planck Gesellschaft
Centre for Scientific Computing