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We’ll call it Math Wednesday. Marc de Vinck turned me on to these amazing fluid-based polygons and polyhedra:

When a vertical water jet strikes a circular horizontal impactor, the water is deflected into a horizontal sheet. At sufficiently high speeds, the flow results in a circular water sheet, whose radius is set by a balance between inertial and curvature forces. At lower speeds, the sheet sags significantly under the influence of gravity, and may close, giving rise to a water bell. We have conducted a series of experiments in order to investigate the influence of increasing fluid viscosity on fluid sheets and bells.

[Thanks, Marc!]

Fluid polygons and polyhedra

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