Suction of splash after impact on dry quick sand

G.A. Caballero-Robledo, K.P.D. Kelly, T.A.M. Homan, J.H. Weijs, D. van der Meer, D. Lohse

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

It is well known that a splash occurs when an object impacts at high velocity on a liquid's surface. If the impact is fast enough, surface tension and air pressure gradients pull the crown-shape splash all the way towards the axis of symmetry, making it to collapse and seal the surface. In this paper we show that splash and surface sealing are also observed in impacts on soft, dry sand. We observe influence of air pressure and grains size on the shape of the splash. By tracking individual grains using high-speed imaging we calculate their acceleration, which results from gravity and drag forces. Assuming friction drag parallel, and pressure drag perpendicular to the direction of motion of grains we estimate the friction and pressure drag contributions to the drag force. Our results support the idea that pressure drag from Bernoulli effect is at the origin of the surface seal.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalGranular Matter
Volume14
Issue number2
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Fluidized beds
  • Granular systems
  • Porous media

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