How to Cut a Liquid with a Knife

What happens when you stick a knife into a solid material and drag it through? A cleavage splits the two sides of the material, leaving a visible trace of the knife. And when you do that to a fluid? Of course, the fluid behind the knife will get back to its original state and the two sides w... [ read more >> ]

Three responses as a cylinder slices through a viscoelastic fluid. Increasingly the cylinder “rips” the fluid, which does not so quickly close up in the wake of the cylinder.

Image comment: Three responses as a cylinder slices through a viscoelastic fluid. Increasingly the cylinder “rips” the fluid, which does not so quickly close up in the wake of the cylinder.
Image credits: Gladden and Belmonte

Three responses as a cylinder slices through a viscoelastic fluid. Increasingly the cylinder “rips” the fluid, which does not so quickly close up in the wake of the cylinder.
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