Jung, Michael, Brinkmann, Martin, Seemann, Ralf, Hiller, Thomas, Sanchez de La Lama, Marta and Herminghaus, Stephan (2016) Wettability controls slow immiscible displacement through local interfacial instabilities. Physical Review Fluids, 1 (7). ISSN 2469-990X
Full text not available from this repository.Abstract
Immiscible fluid displacement with average front velocities in the capillary-dominated regime is studied in a transparent Hele-Shaw cell with cylindrical posts. Employing various combinations of fluids and wall materials allows us to cover a range of advancing contact angles 46∘≤θa≤180∘ of the invading fluid in our experiments. In parallel, we study the displacement process in particle-based simulations that account for wall wettability. Considering the same arrangement of posts in experiments and simulation, we find a consistent crossover between stable interfacial displacement at θa≲80∘ and capillary fingering at high contact angles θa≳120∘. The position of the crossover is quantified through the evolution of the interface length and the final saturation of the displaced fluid. A statistical analysis of the local displacement processes demonstrates that the shape evolution of the fluid front is governed by local instabilities as proposed by Cieplak and Robbins for a quasistatic interfacial displacement [Cieplak and Robbins, Phys. Rev. Lett. 60, 2042 (1988)]. The regime of stable front advances coincides with a corresponding region of contact angles where cooperative interfacial instabilities prevail. Capillary fingering, however, is observed only for large θa, where noncooperative instabilities dominate the invasion process.
Item Type: | Article |
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Uncontrolled Keywords: | displacement of immiscible fluids, imbibition and injection, interfacial phenomena, multiphase flows |
Subjects: | F300 Physics |
Department: | Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering |
Depositing User: | Paul Burns |
Date Deposited: | 23 Oct 2019 16:57 |
Last Modified: | 23 Oct 2019 16:57 |
URI: | http://nrl.northumbria.ac.uk/id/eprint/41218 |
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