Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 381, Issue 2246, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsta.2022.0300
Keywords
elasto-inertial instability; experiments; torque scaling; friction dynamics
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The dynamic properties of elasto-inertial turbulence (EIT) in a Taylor-Couette geometry have been studied. EIT is a chaotic flow state that occurs when both inertia and viscoelasticity are significant. Through direct flow visualization and torque measurement, it has been confirmed that EIT develops earlier than purely inertial instabilities. The scaling of the pseudo-Nusselt number with inertia and elasticity has also been discussed for the first time.
Dynamic properties of elasto-inertial turbulence (EIT) are studied in a Taylor-Couette geometry. EIT is a chaotic flow state that develops upon both non-negligible inertia and viscoelasticity. A combination of direct flow visualization and torque measurement allows to verify the earlier onset of EIT compared with purely inertial instabilities (and inertial turbulence). The scaling of the pseudo-Nusselt number with inertia and elasticity is discussed here for the first time. Variations in the friction coefficient, temporal frequency spectra and spatial power density spectra highlight that EIT undergoes an intermediate behaviour before transitioning to its fully developed chaotic state that requires both high inertia and elasticity. During this transition, the contribution of secondary flows to the overall friction dynamics is limited. This is expected to be of great interest in the aim of achieving efficiency mixing at low drag and low but finite Reynolds number.This article is part of the theme issue Taylor-Couette and related flows on the centennial of Taylor's seminal Philosophical transactions paper (Part 2).
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