The Kaye effect - Leaping Shampoo

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In summary, the conversation is discussing a video of a tube of liquid entering a pool of liquid and creating a heap and streamer as it exits. The discussion touches on possible explanations such as surface tension and EM forces, and references a list of top laboratory reactions. The conversation also mentions a related experiment with instant freezing water and a superheating trick. There is a mention of fluid/continuum mechanics not being a traditional part of physics education.
  • #1
What do think is going on here? leaping shampoo ?

The tube of liquid seems to enter the liquid, turn around 180 degrees just below the surface, and stream back out the way it came in.


* A heap is formed

* A streamer ejects

* the ongoing jet rises

* hits the incoming jet

* this ends the kaye effect

total time: 300 ms.

I'm thinking along the lines of surface tension, or EM forces, but i don't know how it would actually work. :confused:

Oh and i found that video from here; Top Ten Laboratory Reactions, which is worth a look aswell.
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  • #2
That's cool. And yet, fluid/continuum mechanics is not part of the tradiational physics canon in school.

Because it's a stable jet, there is definitely competition between viscous and surface forces (Bond number, capillary number, probably some others). But fundamentally it's due to the nonlinear nature of the flow. I should read their referenced paper...
  • #3
I checked out that link at the bottom, and earlier today I did the experiment with the instant freezing water, I just thought I'de let you guys know that:
1) It works
2) Its really cool to watch.

BTW: The superheating trick uses pretty much the same concept as the supercooling, however, I'm not brave enough for that.

1. What is the Kaye effect?

The Kaye effect, also known as the "leaping shampoo" effect, refers to the phenomenon of a liquid, such as shampoo, suddenly jumping out of its container when a certain threshold of agitation is reached.

2. What causes the Kaye effect?

The Kaye effect is caused by a combination of surface tension, density differences, and shear forces acting on the liquid. When these forces are balanced, the liquid remains in its container, but when they are disrupted, the liquid will leap out of the container.

3. How was the Kaye effect discovered?

The Kaye effect was first observed by British physicist Arthur Kaye in the 1960s while conducting experiments on the behavior of fluids under different conditions. He noticed that when a shampoo bottle was shaken vigorously, the liquid would suddenly jump out of the bottle.

4. Are there any practical applications of the Kaye effect?

Yes, the Kaye effect has been studied for its potential applications in various industries, such as packaging and pharmaceuticals. It is also used in educational demonstrations to illustrate principles of fluid dynamics and surface tension.

5. Can the Kaye effect be replicated with other liquids?

Yes, the Kaye effect has been observed in other liquids besides shampoo, such as syrup, honey, and even water. However, the specific conditions required for the effect to occur may vary depending on the properties of the liquid.

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