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

Experimental evidence of symmetry-breaking supercritical transition in pipe flow of... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Fluids American Physical Society (APS)

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

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

Physical Review Fluids , Volume 2 (3): 8 – Mar 6, 2017

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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Publisher
American Physical Society (APS)
Copyright
Published by the American Physical Society
Subject
RAPID COMMUNICATIONS; Instability, Transition, and Control
ISSN
2469-990X
eISSN
2469-990X
DOI
10.1103/PhysRevFluids.2.031901
Publisher site
See Article on Publisher Site

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.

Journal

Physical Review FluidsAmerican Physical Society (APS)

Published: Mar 6, 2017

There are no references for this article.