Fluid in a thin layer between plexiglas sheets exhibits a fingering instability when the sheets are separated and air is drawn in. Also known as the Taylor-Saffman instability in a Hele Shaw cell.

Fluid in a thin layer between plexiglas sheets exhibits a fingering instability when the sheets are separated and air is drawn in. Also known as the Taylor-Saffman instability in a Hele Shaw cell.

By Spencer Aguilar, Hans Loewenheath and James Shefchik for Spring 2013 Team Second.
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Food dye injected into olive oil forms the Saffman-Taylor fingering instability in a Hele-Shaw cell, in front of a red background.
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Blue food dye fingers into olive oil in a Hele Shaw cell as the top plate is lifted, creating a pressure gradient towards the center.

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