Timeline for Problem observing secondary flow in the Tea Leaf Paradox
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Nov 27, 2019 at 9:43 | comment | added | Jostein Trondal | Looking more closely at the video, I can see a small gush of movement upwards in the center moments after stopping the stirring (about the 1:04 mark). | |
| Nov 25, 2019 at 14:59 | history | edited | tpg2114 |
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| Nov 25, 2019 at 14:53 | answer | added | Alex Trounev | timeline score: 2 | |
| Nov 25, 2019 at 14:45 | comment | added | probably_someone | Neutral buoyancy will only help you so much - if the particles are too large, their inertia will make their motion very different than the motion of the fluid. You really need a really fine, neutrally-buoyant powder to have much of a chance, probably - industrial solutions for this almost certainly exist. | |
| Nov 25, 2019 at 14:38 | comment | added | Jostein Trondal | Yes, I'm looking for something that's neutrally buoyant (and easily available), to maybe see the secondary flow better. I can definitely see the primary effect. I exploit it in beer making. | |
| Nov 25, 2019 at 14:34 | comment | added | probably_someone | The motion of objects in a fluid and the motion of the fluid itself aren't necessarily the same. This is especially true if the objects are large, which your tea fragments definitely are, and not neutrally-buoyant, which is also true (you can see that they sink in water). You wouldn't expect a feather to just suspend itself in the air if there's no wind, after all. But you see the primary effect, which is exactly the same one that's shown in the Wikipedia article - the tea ends up piling up in the center. | |
| Nov 25, 2019 at 14:31 | comment | added | Jostein Trondal | From the moment i turn off the stirring, I expect to see some tea leaves spiraling downwards close to the glass, and spiraling upwards close to the center. Instead I see everything slowly spiraling down, and tea leaves in the center rotating faster than tea leaves near the edge. | |
| Nov 25, 2019 at 14:29 | comment | added | probably_someone | What exactly were you expecting to see? | |
| Nov 25, 2019 at 14:07 | history | asked | Jostein Trondal | CC BY-SA 4.0 |