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 M24: Microscale Flows: Phoretic Effects
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B312
Chair: Federico Toschi, Eindhoven University of Technology
Abstract ID: BAPS.2018.DFD.M24.4
Abstract: M24.00004 : Colloidal accumulation in flow junctions induced by fluid flow and dissolved solutes*
8:39 AM–8:52 AM
Presenter:
Sangwoo Shin
(University of Hawaii at Manoa)
Authors:
Sangwoo Shin
(University of Hawaii at Manoa)
Jesse T Ault
(Oak Ridge National Lab)
Patrick B Warren
(Unilever R&D Port Sunlight)
Howard A Stone
(Princeton University)
The flow of solutions containing solutes and colloidal particles in porous media is widely found in systems including underground aquifers, hydraulic fractures, estuarine or coastal habitats, water filtration systems, etc. In such systems, solute gradients occur when there is a local change in the solute concentration. While the effects of solute gradients have been found to be important for many applications, we observe an unexpected colloidal behavior in porous media driven by the combination of solute gradients and the fluid flow. When two flows with different solute concentrations are in contact near a junction, a sharp solute gradient is formed at the interface, which may allow strong diffusiophoresis of the particles directed against the flow. Consequently, the particles accumulate near the pore entrance, rapidly approaching the packing limit. These colloidal dynamics have important implications for the clogging of a porous medium, where particles that are orders of magnitude smaller than the pore width can accumulate and block the pores within a short period of time.
*We acknowledge Unilever Research, Princeton Environmental Institute, and the NSF (CBET–1702693) for support of this research.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M24.4
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