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Weissenberg effect

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Scientific phenomenon
Illustration of the Weissenberg effect on a 2% solution of high molecular weight polyacrylamide

In fluid dynamics, the Weissenberg effect is a phenomenon that occurs when a spinning rod is inserted into a solution of elastic liquid. Instead of being thrown outward, the solution is drawn towards the rod and rises up around it.[1] This is a direct consequence of the normal stress that acts like a hoop stress around the rod. The effect is a common example of non-Newtonian fluid dynamics, which has been shown to occur for polystyrene.[2] The effect is named after Karl Weissenberg who published about it in 1947.[3]

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