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Unmixing Demo
# 4F10.10


Description: The area between coaxial cylinders is filled with a Newtonian fluid, Glycerine, and a suitable tracer, food color mixed with Glycerine. When the inner cylinder is rotated, the tracer appears to be mixed but is distributed in a fine one armed spiral sheet. Reversing the direction of inner cylinder rotation will cause the original tracer pattern to reappear.

Purchased/Built: built

Setup Time: 2 days

Quant. in Demo Room: 1

Demo References
Freier and Anderson Hm-2 Ink seems to be mixed in glycerine but can be unmixed.
The Video Encyclopedia of Physics Demonstrations Disc 13-08 Glycerine between two concentric cylinders. Animation.
The American Journal of Physics AJP 28(4),348 The area between coaxial cylinders is filled with a Newtonian fluid and a suitable tracer. When the inner cylinder is rotated, the tracer appears to be mixed but is distributed in a fine one armed spiral sheet. Reversing the direction of inner cylinder rotation will cause the original tracer pattern to reappear.

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