The ejecta sheet generated by the impact of a drop

S. T. Thoroddsen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

162 Scopus citations


When a drop impacts on a liquid layer it ejects a thin horizontal sheet of liquid, emanating from the neck region connecting the two liquid masses. Dual-frame imaging and pulsed lasers are used to study the origin, speed and evolution of this ejecta sheet for a range of viscosities. The initial ejecta speed can be more than 10 times the impact velocity of the drop. Visualizations using flourescent dye show the sheet originating from the underlying liquid layer, not the drop liquid. The sheet undergoes a characteristics instability, bending out of its plane and hitting the bottom layer. For some impact conditions the sheet folds in on itself.

Original languageEnglish (US)
Pages (from-to)373-381
Number of pages9
JournalJournal of Fluid Mechanics
StatePublished - Jan 25 2002
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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