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Title: Microconfined equiviscous droplet deformation: Comparison of experimental and numerical results
Authors: Vananroye, Anja ×
Janssen, Pieter J. A
Anderson, Patrick D
Van Puyvelde, Peter
Moldenaers, Paula #
Issue Date: Jan-2008
Publisher: Amer inst physics
Series Title: Physics of fluids vol:20 issue:1
Article number: 012101
Abstract: The dynamics of confined droplets in shear flow is investigated using computational and experimental techniques for a viscosity ratio of unity. Numerical calculations, using a boundary integral method (BIM) in which the Green's functions are modified to include wall effects, are quantitatively compared with the results of confined droplet experiments performed in a counter-rotating parallel plate device. For a viscosity ratio of unity, it is experimentally seen that confinement induces a sigmoidal droplet shape during shear flow. Contrary to other models, this modified BIM model is capable of predicting the correct droplet shape during startup and steady state. The model also predicts an increase in droplet deformation and more orientation toward the flow direction with increasing degree of confinement, which is all experimentally confirmed. For highly confined droplets, oscillatory behavior is seen upon startup of flow, characterized by an overshoot in droplet length followed by droplet retraction. Finally, in the case of a viscosity ratio of unity, a minor effect of confinement on the critical capillary number is observed both numerically and experimentally. (C) 2008 American Institute of Physics.
ISSN: 1070-6631
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
× corresponding author
# (joint) last author

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