Weissenberg effect

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]

## References

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1. ^ "Research".
2. ^ "Article on the Weissenberg effect by Non-Newtonian Fluid Dynamics Group at the Massachusetts Institute of Technology".
3. ^ Weissenberg, K. (1947-03-01). "A Continuum Theory of Rhelogical Phenomena". Nature. 159 (4035): 310–311. doi:10.1038/159310a0. ISSN 1476-4687.

## External links

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* The Isolation of, and the Initial Measurements of the Weissenberg Effect

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Non-Newtonian fluids

Effects|

* Barus
* Self-siphoning
* Kaye
* Toms
* Weissenberg

Properties|

* Viscoelastic materials
* Kelvin–Voigt
* Maxwell
* Time-dependent viscosity
* Rheopecty
* Thixotropy
* Non-Newtonian viscoelasticity
* Shear thinning
* Shear thickening

Generalized Newtonian fluids|

* Bingham
* Carreau
* Cross
* Herschel–Bulkley
* Newtonian
* Power-law

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