Micro-splashing by drop impacts

Sigurdur T Thoroddsen, Kohsei Takehara, Takeharugoji Etoh

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We use ultra-high-speed video imaging to observe directly the earliest onset of prompt splashing when a drop impacts onto a smooth solid surface. We capture the start of the ejecta sheet travelling along the solid substrate and show how it breaks up immediately upon emergence from the underneath the drop. The resulting micro-droplets are much smaller and faster than previously reported and may have gone unobserved owing to their very small size and rapid ejection velocities, which approach 100 m s-1, for typical impact conditions of large rain drops. We propose a phenomenological mechanism which predicts the velocity and size distribution of the resulting microdroplets. We also observe azimuthal undulations which may help promote the earliest breakup of the ejecta. This instability occurs in the cusp in the free surface where the drop surface meets the radially ejected liquid sheet. © 2012 Cambridge University Press.
Original languageEnglish (US)
Pages (from-to)560-570
Number of pages11
JournalJournal of Fluid Mechanics
Volume706
DOIs
StatePublished - Jul 18 2012

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Condensed Matter Physics

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