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.

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.

By James Shefchik, Spencer Aguilar and Hans Loewenheath for Spring 2013 Team Second.
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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.
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Edges between soap bubbles in a two-dimensional sheet form arcs.

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