Pinch-off modes and satellite formation in liquid/liquid jet systems

I. N. Milosevic, E. K. Longmire

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Forced jets of glycerin/water solution flowing into silicone oil were investigated. Forcing amplitudes were sufficient to induce stable or semi-stable pinch-off modes in the jet. The indices of refraction in the two liquids were matched, and planar slices of flow were visualized using laser induced fluorescence. Two-dimensional velocity fields were obtained by particle image velocimetry (PIV). For a viscosity ratio, ηio = 1.6, satellites form at lower Reynolds numbers as well as lower Strouhal numbers. Satellite occurrence depends on the interface shape approaching pinch-off as well as the detailed velocity gradients surrounding the pinch-off region. Satellite formation required a zone of concave curvature downstream of but close to the jet neck as pinch-off approached. This zone was associated with intense vorticity that first deformed the interface into an upstream-facing cone attached to the main drop and then deformed the cone into a satellite shape. Increasing the ambient viscosity suppressed satellite formation for the Reynolds and Strouhal numbers examined.

Original languageEnglish (US)
Pages (from-to)1853-1869
Number of pages17
JournalInternational Journal of Multiphase Flow
Issue number11
StatePublished - Nov 2003

Bibliographical note

Funding Information:
This work was supported by the Engineering Research Program of the Office of Basic Energy Sciences at the Department of Energy (grant DE-FG02-98ER14869).


  • Jet
  • LIF
  • PIV
  • Pinch-off
  • Satellites


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