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Rheologica Acta

, Volume 58, Issue 9, pp 573–590 | Cite as

Investigating the dynamics of droplet breakup in a microfluidic cross-slot device for characterizing the extensional properties of weakly-viscoelastic fluids

  • Kristin A. Marshall
  • Travis W. WalkerEmail author
Original Contribution
  • 163 Downloads

Abstract

A microfluidic device, deemed the Plateau-Rayleigh microfluidic extensional rheometer (PRIMER), is presented that uses a cross-slot geometry to observe a two-phase droplet-breakup event in which the viscoelastic fluid is in the dispersed (or droplet) phase. For viscoelastic fluids, we report that a cylindrical filament forms between droplet segments with a diameter that decays exponentially in time. In optically tracking this decay, both transient extensional viscosity and extensional relaxation times can be evaluated. For validating and optimizing the device, a range of poly(ethylene oxide) (PEO) solutions and Newtonian solutions were tested. Comparisons of the evolution profiles as a result of the presence of elasticity are made, and these results are compared with the results from dripping-onto-a-substrate (DoS), another emerging extensional technique.

Keywords

Breakup Viscoelasticity Extensional flow Drop deformation 

Notes

Acknowledgments

The authors would like to thank Dr. Skip Rochefort, Dr. Alex Yokochi, and Dr. Adam Higgins for their contributions to this work. The authors would also like to thank Oregon State University’s Johnson Summer Internship program and the Saturday Academy’s Apprenticeships in Science and Engineering (ASE) program for supplying talented interns to participate in this work, specifically the authors would like to thank Shelley Haug, Aleesha Liedtke, Katie Moreno, Anika Todt, and Zach Wallace for their assistance in running preliminary experiments. KAM and TWW would also like to thank Hewlett Packard Inc. and the Diversity Pipeline Fellowship at Oregon State University for financial support.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Chemical, Biological, and Environmental EngineeringOregon State UniversityCorvallisUSA
  2. 2.Department of Chemical and Biological EngineeringSouth Dakota School of Mines and TechnologyRapid CityUSA

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