Interfacial instabilities brought on by the penetration of one fluid into another hamper processes such as enhanced oil recovery from porous rock. But these instabilities can be suppressed with a simple gradient in fluid depth — a natural feature of many practical vessel geometries.
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Juel, A. Flattened fingers. Nature Phys 8, 706–707 (2012). https://doi.org/10.1038/nphys2408
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DOI: https://doi.org/10.1038/nphys2408