Issue 31, 2024

Drop impact on wet granular beds: effects of water-content on cratering

Abstract

Drop impact events on a wet granular bed show a rich variety by changing the substrate composition. We observe the drop impact onto dry/wet granular substrates with different grain sizes (50–400 μm) and water contents (0–22 vol%). Despite the fixed impactor conditions (impact velocity: 4.0 m s−1, water drop radius: 1.8 mm), the experiment reveals that the post-impact behaviors of both the impactor and target are strongly influenced by the substrate composition. We categorize these behaviors into several phases concerning liquid splashing and crater shapes left after the event. As these phases are relevant to each other, we measure the mechanical characteristics of the substrates and find that the onset of splashing and particle ejection is explained via the fracture of the substrate. Furthermore, we discuss several timescales of the event to understand the phase separations in more detail. Consequently, we find that the splashing phase and the crater shape are determined by competition among the timescales of impact, penetration, and contact.

Graphical abstract: Drop impact on wet granular beds: effects of water-content on cratering

Supplementary files

Article information

Article type
Paper
Submitted
03 Apr 2024
Accepted
16 Jun 2024
First published
27 Jun 2024
This article is Open Access
Creative Commons BY license

Soft Matter, 2024,20, 6120-6130

Drop impact on wet granular beds: effects of water-content on cratering

W. Zhang, H. Katsuragi and K. Yamamoto, Soft Matter, 2024, 20, 6120 DOI: 10.1039/D4SM00386A

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