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Spectral Universality of Elastoinertial Turbulence
Name
PhysRevLett.127.074501.pdf
Description
Published version
Size
2.91 MB
Format
Adobe PDF
Checksum (MD5)
dec9252b58454962d555235774a1a927
Author(s)
Yamani, Sami
Keshavarz, Bavand
Raj, Yashasvi
Zaki, Tamer A
McKinley, Gareth H
Bischofberger, Irmgard
Date Issued
August 13, 2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Yamani, Sami, Keshavarz, Bavand, Raj, Yashasvi, Zaki, Tamer A, McKinley, Gareth H et al. 2021. "Spectral Universality of Elastoinertial Turbulence." Physical Review Letters, 127 (7).
Version
Final published version
Abstract
Dissolving small amounts of polymer into a Newtonian fluid can dramatically change the dynamics of transitional and turbulent flows. We investigate the spatiotemporal dynamics of a submerged jet of dilute polymer solution entering a quiescent bath of Newtonian fluid. High-speed digital Schlieren imaging is used to quantify the evolution of Lagrangian features in the jet revealing a rich sequence of transitional and turbulent states. At high levels of viscoelasticity, we identify a new distinct transitional pathway to elastoinertial turbulence (EIT) that does not feature the conventional turbulent bursts and instead proceeds via a shear-layer instability that produces elongated filaments of polymer due to the nonlinear effects of viscoelasticity. Even though the pathways to the EIT state can be different, and within EIT the spatial details of the turbulent structures vary systematically with polymer microstructure and concentration, there is a universality in the power-law spectral decay of EIT with frequency, f^{-3}, independent of fluid rheology and flow parameters.
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DOI of Published Version
10.1103/physrevlett.127.074501
