Gelatine cavity dynamics of high-speed sphere impact

Akihito Kiyama, Mohammad M. Mansoor, Nathan B. Speirs, Yoshiyuki Tagawa, Tadd T. Truscott

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We investigate the impact and penetration of a solid sphere passing through gelatine at various impact speeds up to. Tests were performed with several concentrations of gelatine. Impacts for low elastic Froude number, a ratio between inertia and gelatine elasticity, resulted in rebound. Higher values resulted in penetration, forming cavities with prominent surface textures. The overall shape of the cavities resembles those observed in water-entry experiments, yet they appear in a different order with respect to increasing inertia: rebound, quasi-seal, deep-seal, shallow-seal and surface-seal. Remarkably, similar to the - phase diagram in water-entry experiments, the elastic Froude number and elastic Grashof number (a ratio between gravity and gelatine elasticity) classify all five different phenomena into distinguishable regimes. We find that can be a good indicator to describe the cavity length, particularly in the shallow-seal regime. Finally, the evolution of cavity shape, pinch-off depth, and lower cavity radius are investigated for different values.
Original languageEnglish (US)
Pages (from-to)707-722
Number of pages16
JournalJournal of Fluid Mechanics
DOIs
StatePublished - Jan 1 2019
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Condensed Matter Physics

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