Viscous fingering pattern formed when water is injected into oil. The upper bar shows a drainage pattern in a hydrophobic channel. The lower bars show the imbibition patterns that occur with increasing flow rate in hydrophilic channels.
From the article:
Revisiting the Saffman-Taylor Experiment: Imbibition Patterns and Liquid-Entrainment TransitionsBertrand Levaché and Denis Bartolo
Phys. Rev. Lett. 113, 044501 (2014)
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