Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M37: Suspensions: Rheology
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B409
Chair: Harishankar Manikantan, UCSB
Abstract ID: BAPS.2018.DFD.M37.1
Abstract: M37.00001 : Flow Resistance and Structures in Viscoelastic Channel Flows at Low Re*
8:00 AM–8:13 AM
Presenter:
Boyang Qin
(University of Pennsylvania, Princeton University)
Authors:
Boyang Qin
(University of Pennsylvania, Princeton University)
Paul Salipante
(National Institute of Standards and Technology)
Steven Hudson
(National Institute of Standards and Technology)
Paulo E. Arratia
(University of Pennsylvania)
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 $f_{\eta}$ 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 can generate sufficient hoop stresses to sustain the flow instabilities in the parallel shear flow.
*NSF CBET-1336171, NIST on a Chip funding.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M37.1
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