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Experimental evidence of symmetry-breaking supercritical transition in pipe flow of shear-thinning fluids

Chaofan Wen1, Robert J. Poole1, Ashley P. Willis2, and David J. C. Dennis1,*

  • 1School of Engineering, University of Liverpool, Liverpool, L69 3GH, United Kingdom
  • 2School of Mathematics and Statistics, University of Sheffield, Sheffield, S3 7RH, United Kingdom

  • *djcd@liverpool.ac.uk
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Phys. Rev. Fluids 2, 031901(R) – Published 6 March, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.031901

Abstract

Experimental results reveal that the asymmetric flow of shear-thinning fluid through a cylindrical pipe, which was previously associated with the laminar-turbulent transition process, appears to have the characteristics of a nonhysteretic, supercritical instability of the laminar base state. Contrary to what was previously believed, classical transition is found to be responsible for returning symmetry to the flow. An absence of evidence of the instability in simulations (either linear or nonlinear) suggests that an element of physics is lacking in the commonly used rheological model for inelastic shear-thinning fluids. These unexpected discoveries raise new questions regarding the stability of these practically important fluids and how they can be successfully modeled.

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Phys. Rev. Fluids 2, 031901(R)– Published 6 March, 2017
  • Received 25 May 2016
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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