Drop Penetration through a Constriction: Effect of Surrounding Fluid

Ellen K. Longmire, Ankur D. Bordoloi

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


In this study, we examine the effect of surrounding liquid on the motion of gravity-driven drops through a round-edged circular orifice using high-speed visualization and refractive index matched PIV. The overall motion of the drop is separated into three stages: pre-impact, penetration and release. We show that in liquid/liquid systems, the surrounding fluid influences the drop velocity during both pre-impact and release stages. During the pre-impact stage, the drop approaches the orifice by displacing the surrounding liquid radially across the plate as well as axially through the orifice. During the release stage on the other hand, surrounding fluid is drawn downward into the orifice as the drop exits below the plate. In both cases, the drop decelerates due to added mass and viscous effects, which are negligible in liquid/gas flows. Drop breakup is promotedby a higher viscosity surrounding such that the volume of the satellite drop increases when the drop-to-surrounding-fluid viscosity ratio is decreased.

Original languageEnglish (US)
Pages (from-to)194-200
Number of pages7
JournalProcedia IUTAM
StatePublished - 2015
EventIUTAM Symposium on Multiphase Flows with Phase Change: Challenges and Opportunities, IUTAM 2014 -
Duration: Dec 8 2014Dec 11 2014

Bibliographical note

Publisher Copyright:
© 2015 The Authors. Published by Elsevier B.V.


  • PIV
  • added mass
  • drops
  • impact
  • liquid/liquid system
  • pore


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