Confined drop motion in viscoelastic two-phase systems

Ruobo You, Hossein Haj-Hariri, Ali Borhan

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, we numerically examine the buoyancy-driven, axisymmetric motion of drops through vertical cylindrical capillaries. Combinations of Newtonian and viscoelastic drop and suspending fluid phases are considered. The effects of confinement, material properties, and rheological properties of the two phases on drop mobility and deformation are examined. Four dimensionless parameters (Reynolds number, capillary number, Deborah number, and the drop-to-tube size ratio) play critical roles in determining the drop motion. In general, a Newtonian drop immersed in a viscoelastic fluid experiences an extending trailing edge, while a viscoelastic drop in a Newtonian fluid develops an indentation around the rear stagnation point. Under certain conditions, a cusped drop appears due to fluid viscoelasticity that triggers shape instability.

Original languageEnglish (US)
Article number013102
JournalPhysics of Fluids
Volume21
Issue number1
DOIs
StatePublished - Jan 1 2009

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binary systems (materials)
fluids
stagnation point
Newtonian fluids
trailing edges
viscoelasticity
indentation
buoyancy
Reynolds number
actuators
tubes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

You, Ruobo ; Haj-Hariri, Hossein ; Borhan, Ali. / Confined drop motion in viscoelastic two-phase systems. In: Physics of Fluids. 2009 ; Vol. 21, No. 1.
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Confined drop motion in viscoelastic two-phase systems. / You, Ruobo; Haj-Hariri, Hossein; Borhan, Ali.

In: Physics of Fluids, Vol. 21, No. 1, 013102, 01.01.2009.

Research output: Contribution to journalArticle

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