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- W4366999838 abstract "Direct numerical simulations are used to elucidate the interplay of wettability and fluid viscosities on immiscible fluid displacements in a heterogeneous porous medium.We classify the flow regimes based using qualitative and quantitative analysis into viscous fingering (low $M$), compact displacement (high $M$), and an intermediate transition regime ($M approx 1$). We use stability analysis to obtain theoretical phase boundaries between these regimes, which agree well with our analyses. At the macroscopic (sample) scale, we find that wettability strongly controls the threshold $M$ (at which the regimes change). At the pore scale, wettability alters the dominant pore-filling mechanism. At very small $M$ (viscous fingering regime), smaller pore spaces are preferentially invaded during imbibition, with flow of films of invading fluid along the pore walls. In contrast, during drainage, bursts result in filling of pores irrespective of their size. As $M$ increases, the effect of wettability decreases as cooperative filling becomes the dominant mechanism regardless of wettability. This suggest that for imbibition at a given contact angle, decreasing $M$ is associated with change in effective wetting from neutral-wet (cooperative filling) to strong-wet (film flow)." @default.
- W4366999838 created "2023-04-27" @default.
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- W4366999838 date "2023-04-23" @default.
- W4366999838 modified "2023-09-27" @default.
- W4366999838 title "Interplay of viscosity and wettability controls fluid displacement in porous media" @default.
- W4366999838 doi "https://doi.org/10.48550/arxiv.2304.11704" @default.
- W4366999838 hasPublicationYear "2023" @default.
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