Extensional flows of polymer solutions in microfluidic converging/diverging geometries

G.H. McKinley, Lucy E. Rodd, Monica Oliveira, J.J. Cooper-White

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.
Original languageEnglish
Pages (from-to)6
JournalJournal of the Central South University of Technology
Issue number1-Supplement
Publication statusPublished - Feb 2007


  • extensional flow
  • polymer solutions
  • converging flow
  • diverging flow


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