Sculpting sandcastles grain by grain: self-assembled sand towers.

@article{PachecoVzquez2012SculptingSG,
  title={Sculpting sandcastles grain by grain: self-assembled sand towers.},
  author={F. Pacheco-V{\'a}zquez and Fr{\'e}d{\'e}rique Moreau and N. Vandewalle and St{\'e}phane Dorbolo},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2012},
  volume={86 5 Pt 1},
  pages={051303}
}
We study the spontaneous formation of granular towers produced when dry sand is poured on a wet sand bed. When the liquid content of the bed exceeds a threshold value W*, the impacting grains have a nonzero probability to stick on the wet grains due to instantaneous liquid bridges created during the impact. The trapped grains become wet by the capillary ascension of water and the process continues, giving rise to stable narrow towers. The growth velocity is determined by the surface liquid… CONTINUE READING

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