Speaker
Description
The pore-scale interfacial dynamics including main-meniscus flow and corner flow usually occurs in heterogeneous porous media and significantly affects the macroscopic multiphase flow process. The numerical research on the competition between main-meniscus flow and corner flow remains challenging, particularly its upscaling in porous media due to the large spatial and temporary scale difference. We proposed a critical capillary number (Ca) by considering the interplay of local capillary and viscous forces, which predicts transition from main-meniscus flow into corner flow during the strong imbibition. The critical Ca model was employed to establish a dynamic network model by upscaling the pore-scale interfacial dynamics with the multiphase flow in porous media. The forced imbibition in heterogenous porous media with various depths under different Ca were simulated and compared to microfluidic experimental data. The comparison indicates that the dynamic competition between main-meniscus flow and corner flow vitally affects the displacement behaviors predicted by pore-scale modelling, and our dynamic network model accurately captures the interfacial dynamics observed in the microfluidic experiments. Moreover, the impact of interfacial dynamics on macroscopic multiphase flow pattern and displacement efficiency in heterogeneous porous meida were addressed during strong imbibition under various viscosity ratios and capillary numbers. The phase diagram manifests a monotonic effect of viscosity ratio on displacement efficiency at high Ca due to the dominance of viscous fingering. A non-monotonic effect of viscosity ratio is revealed at low Ca, which is ascribed into competition between corner flow and main-meniscus flow.
| Country | China |
|---|---|
| Water & Porous Media Focused Abstracts | This abstract is related to Water |
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