de Jong Rianne, Zhao Song-Chuan, Garcia-Gonzalez Diana, Verduijn Gijs, van der Meer Devaraj
Physics of Fluids Group, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
Soft Matter. 2021 Jan 7;17(1):120-125. doi: 10.1039/d0sm01579b. Epub 2020 Nov 6.
How does the impact of a deformable droplet on a granular bed differ from that caused by a solid impactor of similar size and density? Here, we experimentally study this question and focus on the effect of intruder deformability on the crater shape. For comparable impact energies, we show that the crater diameter is larger for droplets than for solid intruders but that the impact of the latter results in deeper craters. Interestingly, for initially dense beds of packing fractions larger than 0.58, we find that the resultant excavated crater volume is independent of the intruder deformability, suggesting an impactor-independent dissipation mechanism within the sand for these dense beds.
可变形液滴对颗粒床的冲击与尺寸和密度相似的固体冲击器所造成的冲击有何不同？在此，我们通过实验研究这个问题，并聚焦于侵入体可变形性对弹坑形状的影响。对于可比的冲击能量，我们发现液滴形成的弹坑直径比固体侵入体形成的更大，但后者的冲击会导致更深的弹坑。有趣的是，对于初始堆积分数大于0.58的致密床，我们发现所形成的挖掘弹坑体积与侵入体可变形性无关，这表明对于这些致密床，沙子内部存在一种与冲击器无关的耗散机制。
