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.

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.

By Kenneth Wine, Gregory Lawson, Logan Mueller, John Hebert for Spring 2014 Team Second.
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Aluminum chips spinning in a cylinder. Air was injected tangentially to create the vortex.
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