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Three-Dimensional Symmetry Breaking and Disturbance Propagation in Viscoelastic Cross Channel Flow

Published

Author(s)

Boyang Qin, Ranjiangshang Ran, Paul Salipante, Steven Hudson, Paulo E. Arratia

Abstract

Using holographic particle tracking, we report the three-dimensional flow structure organizing the viscoelastic instability in cross-channel flow. Beyond a critical Wi, the advective core flow undergoes an out-of-plane instability marked by the emergence of tertiary flow, resembling that of the toroidal vortices in Taylor-Couette geometry. The out-of-plane flow component distorts the separatrix between the impinging inflow streams, triggering symmetry breaking normal to the extension plane. As extensional rate increases, progressively higher order modes of the separatrix are observed, akin to Euler buckling of a rigid column. The disturbances propagate upstream via stress fluctuations despite viscous dissipation. These complex flow structures may be generic to elastic turbulence in mixed flows.
Citation
Soft Matter
Volume
16

Keywords

viscoelastic flow instability, 3D particle tracking flow velocimetry, extensional flow

Citation

Qin, B. , Ran, R. , Salipante, P. , Hudson, S. and Arratia, P. (2020), Three-Dimensional Symmetry Breaking and Disturbance Propagation in Viscoelastic Cross Channel Flow, Soft Matter, [online], https://doi.org/10.1039/d0sm00555j (Accessed February 27, 2024)
Created June 3, 2020, Updated October 12, 2021