Pressure gradients caused by squeezing and pulling the plates of a Hele-Shaw cell cause the Saffman-Taylor fingering instability in honey, air and dyed water.

Pressure gradients caused by squeezing and pulling the plates of a Hele-Shaw cell cause the Saffman-Taylor fingering instability in honey, air and dyed water.

By Eric Fauble, Alex Unger, Scott Hodges, and Zac Rice for Spring 2014 Team First.
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Taylor-Saffman instability in a Hele-Shaw cell. The pressure of rapidly injecting water lifted the top sheet, inducing the instability around the outer edge of the honey as air entered.
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Dyed water injected into dyed corn syrup displays the Saffman-Taylor fingering instability in a Hele-Shaw cell.

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