Soap Film Tunnels

This is the small (and portable) soap-film tunnel that is used for demonstrations and small experiments around the department. It has also traveled to Santa Fe Institute. To learn more about soap-film hydrodynamics, click here.
I will be adding the picture of the large soap-film tunnel soon. The large tunnel has the dubious distinction of producing the slowest gravity-driven soap-film flows: about 30 cm/s on a good day (for comparison, the flow in the small tunnel is 2 m/s).