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Topic: saw something interesting (fluid dynamics)  (Read 1948 times)

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Offline pcm81

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saw something interesting (fluid dynamics)
« on: January 16, 2023, 07:09:36 PM »
Was cleaning my filter using a pirana solution. Set it to drip into a flask. When looked inside saw drops spread out and rush back in towards the center. You can see it on video here: https://www.youtube.com/shorts/h6cOTa4TSNE
looks like the video is in reverse, but it is not.

EDIT: Most likely the explanation is as simple as: the little droplets are bouncing off the walls of the flask and back to the middle, because the effect stopped once some fluid accumulated near the perimeter, still kinda cool to see.
« Last Edit: January 16, 2023, 07:20:01 PM by pcm81 »

Offline Borek

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Re: saw something interesting (fluid dynamics)
« Reply #1 on: January 17, 2023, 03:07:40 AM »
Cool. Apparently some combination of surface tension and whateverphobicity stops the droplets from sticking to the glass earlier.

Looks a bit like the Leidenfrost effect.
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