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Viscous thread falling on a moving belt

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Uploaded on May 19, 2009

A stream of very viscous syrup falls from a nozzle onto a moving belt. Initially, the belt is moving so fast that the thread is just pulled out straight. As the speed of the belt is reduced, the thread first bifurcates to a meandering state, and then to a "figure eight" state. Finally, the thread falls into a coiling motion similar to what it would do on a non-moving surface.

The syrup is Newtonian.

See http://www.physics.utoronto.ca/nonlin...

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