PMID: 22587098May 17, 2012Paper

Stagnation point flow of wormlike micellar solutions in a microfluidic cross-slot device: effects of surfactant concentration and ionic environment

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Simon J Haward, G H McKinley

Abstract

We employ the techniques of microparticle image velocimetry and full-field birefringence microscopy combined with mechanical measurements of the pressure drop to perform a detailed characterization of the extensional rheology and elastic flow instabilities observed for a range of wormlike micellar solutions flowing through a microfluidic cross-slot device. As the flow rate through the device is increased, the flow first bifurcates from a steady symmetric to a steady asymmetric configuration characterized by a birefringent strand of highly aligned micellar chains oriented along the shear-free centerline of the flow field. At higher flow rates the flow becomes three dimensional and time dependent and is characterized by aperiodic spatiotemporal fluctuations of the birefringent strand. The extensional properties and critical conditions for the onset of flow instabilities in the fluids are highly dependent on the fluid formulation (surfactant concentration and ionic strength) and the resulting changes in the linear viscoelasticity and nonlinear shear rheology of the fluids. By combining the measurements of critical conditions for the flow transitions with the viscometric material properties and the degree of shear-thinning characte...Continue Reading

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Citations

Jun 25, 2014·Advances in Colloid and Interface Science·Ya ZhaoAmy Q Shen
Feb 10, 2016·Biomicrofluidics·Chen-Li Sun, Hung-Yen Huang
Apr 22, 2016·Biomicrofluidics·S J Haward
Sep 13, 2016·Scientific Reports·Simon J HawardAmy Q Shen
Oct 10, 2014·Soft Matter·Marc-Antoine Fardin, Sandra Lerouge
Sep 24, 2015·Soft Matter·P C SousaM A Alves
Jan 15, 2016·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Setareh Shahsavari, Gareth H McKinley
Aug 18, 2017·Soft Matter·Junghee KimJu Min Kim
Mar 22, 2014·Soft Matter·Christophe PergeSébastien Manneville
Sep 26, 2012·Physical Review Letters·Simon J HawardGareth H McKinley
Oct 15, 2021·Lab on a Chip·Simon J HawardAmy Q Shen

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