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Fluid dynamics

Flattened fingers


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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Figure 1: Interfacial instabilities in Hele–Shaw cells.


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Correspondence to Anne Juel.

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Juel, A. Flattened fingers. Nature Phys 8, 706–707 (2012).

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