Qin, B.
, Salipante, P.
, Hudson, S.
and Arratia, P.
(2019),
Flow Resistance & Structures in Viscoelastic Channel Flows at Low Re, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevLett.123.194501, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926221
(Accessed April 10, 2025)
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Flow Resistance & Structures in Viscoelastic Channel Flows at Low Re
Published
Author(s)
Boyang Qin, , , Paulo E. Arratia
Abstract
The flow of viscoelastic fluids in channels and pipes remain poorly understood, particularly at low Reynolds numbers. Here, we investigate the flow of polymeric solutions in straight channels using pressure measurements and particle tracking. The law of flow resistance is established by measuring the flow friction factor f versus flow rate. Two regimes are found: a transitional regime marked by rapid increase in drag, and a turbulent-like regime characterized by a sudden decrease in drag and a weak dependence on flow rate. Lagrangian trajectories show finite transverse modulations not seen in Newtonian fluids. These curvature perturbations far downstream are found to generate sufficient hoop stresses to sustain the flow instabilities in the parallel shear flow.Citation
Physical Review Letters
Volume
123
Pub Type
Journals
Download Paper
Keywords
turbulence, microfluidics, polymer solutions, viscoelastic flow, holographic microscopy, high resolution 3D particle tracking
Citation
Issues
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Created November 4, 2019, Updated October 12, 2021