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Modulation of elasto-inertial transitions in Taylor–Couette flow by small particles

Published online by Cambridge University Press:  27 October 2021

Tom Lacassagne*
Affiliation:
FLUME, Department of Mechanical Engineering, University College London (UCL), London WC1E 7JE, UK IMT Nord Europe, Institut Mines-Télécom, Univ. Lille, Centre for Energy en Environment, F-59000 Lille, France
Theofilos Boulafentis
Affiliation:
FLUME, Department of Mechanical Engineering, University College London (UCL), London WC1E 7JE, UK
Neil Cagney
Affiliation:
School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
Stavroula Balabani*
Affiliation:
FLUME, Department of Mechanical Engineering, University College London (UCL), London WC1E 7JE, UK
*
Email addresses for correspondence: [email protected], [email protected]
Email addresses for correspondence: [email protected], [email protected]

Abstract

Particle suspensions in non-Newtonian liquid matrices are frequently encountered in nature and industrial applications. We here study the Taylor–Couette flow (TCF) of semidilute spherical particle suspensions (volume fraction $\leq 0.1$) in viscoelastic, constant-viscosity liquids (Boger fluids). We describe the influence of particle load on various flow transitions encountered in TCF of such fluids, and on the nature of these transitions. Particle addition is found to delay the onset of first- and second-order transitions, thus stabilising laminar flows. It also renders them hysteretic, suggesting an effect on the nature of bifurcations. The transition to elasto-inertial turbulence (EIT) is shown to be delayed by the presence of particles, and the features of EIT altered, with preserved spatio-temporal large scales. These results imply that particle loading and viscoelasticity, which are known to destabilise the flow when considered separately, can on the other hand compete with one another and ultimately stabilise the flow when considered together.

Type
JFM Rapids
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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