Dye dropped onto a drain vortex in a 2 liter bottle forms cylindrical curtains

Dye dropped onto a drain vortex in a 2 liter bottle forms cylindrical curtains

By Carl Marvin for Spring 2014 Team Second.
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A stirrer creates a vortex with a conical water surface, viewed from above. Green laser light is trapped along the surface, and also reflects off the beaker rim and some aluminum flakes in the water.
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A vortex created by a magnetic stirrer pulls down the water surface, viewed here from below and flipped vertically.

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