The Weissenberg Effect

When a rod mounted in a hand drill is dipped into a liquid and rotated, for certain non-Newtonian fluids the liquid will climb the rod - sometimes to quite spectacular heights.

Such rob climbing behaviour is referred to as the Weissenberg Effect. Shearing in the flow of the liquid concentrically around the rotating rod causes the component of the stress normal to the circular flow direction to become greater in magnitude compared to the two other mutually perpendicular components. This causes the fluid around the rotating rod to contract and be squeezed up along the axis of the rod causing it to in turn "climb" the rod.




The three different fluids shown in the video, all of which exhibit the Weissenberg effect, are: (i) a natural polymer formed from a guar gum solution crosslinked with sodium tetraborate in solution, (ii) pancake batter (flour, water and egg white), and (iii) a dyed synthetic polymer consisting of white glue which has again been crosslinked with sodium tetraborate in solution.

Category:

Howto & Style

Tags:

• Weissenberg
• effect
• rod-climbing
• non-Newtonian
• fluid
• viscoelastic
• liquid
• physics
• experiments
• demonstrations

[Tardis1217]

I'll display stunning rod-climbing abilities... if you catch my drift

[andreasfr1]

Yellow is coming to get you!

[jayejayeee]

great video thanks

[CE7M6]

Guess it would be safe enough, if the bowl was was flushed. : |

[CE7M6]

Don't stick that Rod in the Toilet bowl :/

[MrJonkelp]

i enjoyed this vid

[bebeheuy]

I am very happy to see the vidoe after you give this When a rod mounted in a hand drill is dipped into a liquid and rotated, for certain non-Newtonian fluids the liquid will climb the rod - sometimes to quite spectacular heights.

[AntoMelta]

I Really Like The Video From Your When a rod mounted in a hand drill is dipped into a liquid and rotated, for certain non-Newtonian fluids the liquid will climb the rod - sometimes to quite spectacular heights.

[willamricard]

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[imegatrone]

after i watched this video, my insight is very open because the video is very good to give information When a rod mounted in a hand drill is dipped into a liquid and rotated, for certain non-Newtonian fluids the liquid will climb the rod - sometimes to quite spectacular heights.

[akshastry]

hey i want to use a very small part of this video for a competition. can i??

[LavenderSpecs]

It makes fun to watch. I sometimes ask myself, why my teacher in physics never made such experiments.