Abstract
The strain-controlled flow of a wormlike micellar solution in cylindrical Couette geometries with smooth and rough glass inner walls is investigated using 2D 1H NMR velocimetry. We find anomalous shear banding in which fluctuating slip dynamics in combination with surfactant properties lead to a non-lever rule behaviour where the interface position remains constant while the high and low shear rates change. Velocities in the flow direction are imaged in the flow-gradient/vorticity plane. The spatiotemporal resolution achieved reveals fluctuations in flow structure along the vorticity axis and instability of the high shear band.
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Acknowledgements
Dr. Suzanne Fielding is thanked for valuable discussions. Funding for this research was provided by the Marsden fund. KWF thanks the Natural Sciences and Engineering Research Council of Canada for a post-doctoral fellowship.
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Feindel, K.W., Callaghan, P.T. Anomalous shear banding: multidimensional dynamics under fluctuating slip conditions. Rheol Acta 49, 1003–1013 (2010). https://doi.org/10.1007/s00397-010-0470-9
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DOI: https://doi.org/10.1007/s00397-010-0470-9