Meandering viscous thread

Meandering viscous thread

This movie is in QuickTime format. Download the QuickTime plugin.

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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 movie is in real time. Its large, 26MB.

Go here for the low resolution YouTube version.

See Meandering instability abstract for a publication about this effect.

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The Experimental Nonlinear Physics Group, Dept. of Physics, University of Toronto,
60 St. George St. Toronto, Ontario, Canada, M5S 1A7. Phone (416) 978 - 6810.