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Polymer Drop Breakup in Microchannels

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Uploaded on May 27, 2008

P.E. Arratia, J.P. Gollub, D.J. Durian
Chaos 17, 041102 (2007)
http://link.aip.org/link/?CHAOEH/17/0...

The movie presents an experimental study of the thinning and breakup of fluid filaments in a cross-slot microchannel flow. We compare and contrast the behavior of Newtonian and a viscoelastic fluid (polymeric solution) breaking in an oil continuous phase. All fluids (oil, Newtonian, and polymeric) have the same shear viscosity of approximately 0.24 Pa s.

When a viscous solution is stretched by an external immiscible fluid (oil), a low 100 ppm polymer concentration strongly affects the breakup process, compared to the Newtonian case. At late times when viscoelastic stresses become important, polymer filaments show much slower evolution, longer filaments, and morphology featuring multiple connected drops. Measurements of filament thickness show two main temporal regimes: a flow- and capillary-driven. The former is observed through most of the filament thinning process while the latter is observed only near filament breakup.

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