Youtube
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.
Author:psidot
Tags:Weissenberg physics liquid fluid rod-climbing effect experiments demonstrations viscoelastic non-Newtonian
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Komentarze
| Non-newtonian liquids do a lot of bizarre things... | Cesariono |
| You didnt read the whole comment, he said "While being an example of a non-Newtonian fluid, it is not viscoelastic." | Graylord88 |
| ok moving on into the twentieth century and the ELECTRIC DRILL. | bubba062393 |
| the fluids that are being used are either sticky or some other dense material (not pure water). the material sticks to the rotating rod and thus begins to rotate. a vortex is created in which it attracts more of the fluid. within the created vortex the liquids density is greater than that of the fluid surrounding it - thus it has to expand somehow. because there is a current created drawing it inward it has no where else to go except up and down. we cant see the down but the up is visible. boya! | jfb005700 |
| Im sad to say, i think i know understand the answer, but i have no idea how to put it to the word. | Graylord88 |
| Question here, we know that those liquid could climb up while rotating. But this liquid should have other external energy such that it can have enough potential energy. But where is the external energy coming from? All we saw is just a rotating rod. But rotation is not a vertical motion, it should not be the energy source for the potential energy. But if we just consider the energy conservation, rotating rod is the only source. Could any1 know the answer? How could the fluid moving up? | MetalHensen |
| Very Fun!!!!!! | joehwu |
| It seems logical to use mass/density, if so, what density does water have, and what density does, say cornstarch or custard have. And at what density is a fluid referred to as non-newtonian? | Graylord88 |
| Of course it has to do with how you throw it, it's like running on custard(non-newtonian), stand still and you sink. With the right speed/angle/weight/touch-timespan, both are able to get a grip enough to move further, all fluids are non-newtonian in that sense, i am just asking how they calculate the limit and where this limit is. | Graylord88 |
| skipping stones has to do with the way u throw the stone and how flat it is. No non-newtonian fluid stuff involved | mrantis |
| With enough force it does, IE skipping stones. | Graylord88 |
| water doesn't | mrantis |
| yes | mrantis |
| Cool. Thanks. | EVCarolina |
| lawl? | skatman572 |
| what is it??? | 0omikko0 |
| What is the limit to what is defined as non-newtonian fluids? With enough force, even common water has non-newtonian properties. | Graylord88 |
| The white glue-part was a bit frightening :D A liquid and its climbing up... like a horror movie with an alien lifeform | SwhereNthing |
| cornstarch, not corn flour. Cornstarch+Water is a non-newtonian fluid, so it should work. | kirbyfan95 |
| Corn flour with water does not work. While being an example of a non-Newtonian fluid, it is not viscoelastic. That is, the fluid does not have both viscous and elastic properties which are needed if the Weissenberg Effect is to occur. | psidot |
| does this work for cornstarch+water? | LordTeaOfBiscuits |
| brendanbell, spell YOU'RE correctly. You moron! :) | breastimus |
| I once knew a girl called candy, she has a magnificent rod climbing ability. | JetJockey87 |
| Okay. I think I get it now. | Asdam12 |
| Yes, the viscosity depends on the size of the force applied to the fluid. Corn flour mixed with water, while an example of a non-Newtonian fluid, is not viscoelastic and will therefore not exhibit the Weissenberg effect. | psidot |