Rheoscopic fluid (Pearl Swirl) shows turbulent boundary layers in shallow channel flow.

Rheoscopic fluid (Pearl Swirl) shows turbulent boundary layers in shallow channel flow.

By Melissa Blackstun and Jason Brownstein for Spring 2014 Team Third.
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As silver bottle wax melts in a crock pot, its optical characteristics change, allowing motion in the wax to be seen, illustrating non-diffusive mixing.
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A von Karman vortex street forms in the wake of a cylinder in shallow channel flow, visualized with a rheoscopic fluid (Pearl Swirl).

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