Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X34: Non-Newtonian Flows: General
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 201
Chair: Antony Beris, University of Delaware
Abstract: X34.00002 : Modeling and Simulation of Inhomogeneous Time-Dependent Poiseuille Pipe Flow of Aggregating Concentrated Suspensions*
8:13 AM–8:26 AM
Presenter:
Antony N Beris
(University of Delaware)
Authors:
Antony N Beris
(University of Delaware)
Soham Jariwala
(University of Delaware)
Norman J Wagner
(University of Delaware)
To model the viscoelastic and thixotropic characteristics of the aggregating suspension rheology, we use a multiscale approach, where a reduced (zero-moment-based) model of the aggregation based on a microscopic population balance approach is coupled with a phenomenological macroscopic extended White-Metzner-type viscoelastic model for the stress. We also describe the effect of stress and wall-induced migration through a variant of the Phillips et al. [Phys. Fluids 4 (1992) 30-40] model. We show the development of concentration gradients depending on both the steady and oscillatory pressure gradient characteristics. A potentially important result for applications is that the superposition of oscillatory gradient to the steady one can potentially increase the average fluid throughput.
*Supported by NSF CBET 1804911
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