Weissenberg effect

{{Short description|Scientific phenomenon}}

File:Effet_Weissenberg.jpg

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.{{Cite web|url=http://web.mit.edu/nnf/research/phenomena/rodclimbing.html|title = Research}} 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.{{Cite web|url=https://nnf.mit.edu/home/billboard/topic-5|title = Article on the Weissenberg effect by Non-Newtonian Fluid Dynamics Group at the Massachusetts Institute of Technology}}

The effect is named after Karl Weissenberg who published about it in 1947.{{Cite journal |last=Weissenberg |first=K. |date=1947-03-01 |title=A Continuum Theory of Rhelogical Phenomena |url=https://www.nature.com/articles/159310a0 |journal=Nature |language=en |volume=159 |issue=4035 |pages=310–311 |doi=10.1038/159310a0 |issn=1476-4687}}