I landed here via Veritassiums great video with Jon Aurnou qualitatively explaining how Earth generates its magnetic field and I must admit I had no idea what was about to happen to me. The explanations and experimental demonstrations in this video have enhanced my understanding of fluid dynamics in our atmosphere immensely. I already felt like Jaffe and Washington's book "The Physics of Energy" gave som really good in-depth explanations of the coriolis effect, but this video is just... mind-blowingly good! Thank you so much for providing such high quality content.
Hello spinlab! Thanks so much for this amazing video. At 17:15, you mention that recent data shows that there is no polar cell or ferrel cell, but rather that the polar easterlies and the mid latitude westerlies are the result of interactions between eddies. Could you please post the references/sources for the same? Thanks! Also, have you explored modeling such eddy interactions in similar table top experiments?
For an exhaustive reference, see Vallis' textbook. Experiments that touch on these topics are those by Peter Read's group in the UK, and Uwe Harlander's in Germany.
The sinking flow diverges near the bottom boundary and converges near the top boundary. Coriolis then deflects the diverging fluid CW and the converging fluid CCW. Stated alternatively, these circulations develop to conserve angular momentum.
What can explain the clockwise vortex at the north hemisphere at 10hpa on earthnullschool? Aren't we supposed to have opposing rotational swirls per hemisphere? In the south it's supposed to be cw. And in the north it's supposed to be ccw/acw. I've watched the ccw swirl be diminished by the cw swirl since the start of this year.
22:00 in the video a uniform rotating flow is discussed. I think the Coriolis effect alone cannot explain this flow pattern. At the top and bottom a boundary layer forms, between the bottom and top perpendicular to the rotation axis, an uniform rotating flow with an vertical velocity component downwards exists. The flow is not smooth and contains an material interface. Are there digital simulations for this flow pattern?
That was awesome! I am going to try to recreate your experiments for my high school physics class. I will need to do it on a smaller scale, so; if anyone has any ideas on how to do that, I would appreciate them.
Record turntable, 20 liter plastic bucket from restaurant supply store (Smart&Final), small camera that can cast to larger screen (GoPros are great, but I have used my phone+zoom in a pinch). higher frame rates and decent resolution help. Tripods, duct tape and other "structures" (used a plate drying rack). I'll post some of these on my channel and make them public. Good luck. Your HS sounds awesome. Feel free to reach out on anything, though I suspect your works will be even better than what I have done so far.
Also helpful: USB fans and external backup batteries with USB charging ports and more duct tape. there is a whole universe of stuff one can power with these.
Lovely! You may also be interested in some of the kits we have been developing at diynamics.github.io, but they probably cant beat your DC motor. Same idea though I expect...
I landed here via Veritassiums great video with Jon Aurnou qualitatively explaining how Earth generates its magnetic field and I must admit I had no idea what was about to happen to me. The explanations and experimental demonstrations in this video have enhanced my understanding of fluid dynamics in our atmosphere immensely. I already felt like Jaffe and Washington's book "The Physics of Energy" gave som really good in-depth explanations of the coriolis effect, but this video is just... mind-blowingly good! Thank you so much for providing such high quality content.
Wow! That makes my day, Mads! So happy to here this. Makes me want to carve out more time to make more vids! --Jon
Gorgeous experiments, well done.
Hello spinlab! Thanks so much for this amazing video. At 17:15, you mention that recent data shows that there is no polar cell or ferrel cell, but rather that the polar easterlies and the mid latitude westerlies are the result of interactions between eddies. Could you please post the references/sources for the same? Thanks! Also, have you explored modeling such eddy interactions in similar table top experiments?
For an exhaustive reference, see Vallis' textbook. Experiments that touch on these topics are those by Peter Read's group in the UK, and Uwe Harlander's in Germany.
The sinking flow diverges near the bottom boundary and converges near the top boundary. Coriolis then deflects the diverging fluid CW and the converging fluid CCW. Stated alternatively, these circulations develop to conserve angular momentum.
Fantastic series of demonstrations! Am I the only one wondering how you got the record player to spin backwards? :-)
This was amazing! Very informative and a good way of looking at how fluid moves =D
Thanks very much. Happy you like it.
What a wonderfull video, will show in my class to mechanical eng students.
It is far better to teach coriolis with experiments than with matrices.
Excellent. You might also be interested in our simple experiments at diynamics.github.io. Even more fun than video...
What can explain the clockwise vortex at the north hemisphere at 10hpa on earthnullschool? Aren't we supposed to have opposing rotational swirls per hemisphere? In the south it's supposed to be cw. And in the north it's supposed to be ccw/acw. I've watched the ccw swirl be diminished by the cw swirl since the start of this year.
22:00 in the video a uniform rotating flow is discussed. I think the Coriolis effect alone cannot explain this flow pattern. At the top and bottom a boundary layer forms, between the bottom and top perpendicular to the rotation axis, an uniform rotating flow with an vertical velocity component downwards exists. The flow is not smooth and contains an material interface. Are there digital simulations for this flow pattern?
Great job!!
Why did you use potassium permangante? Does it enhance swirling? Or could I get by without it?
At 23:10, why do you have CCW flow at the top of the column?
Chaotic advection and unstable manifolds of hyperbolic points forever ;)
Which colors other than the potassium permanganate did you use for the demonstration?
Food coloring for all non-purples. Like 3 dollars at the supermarket.
That was awesome! I am going to try to recreate your experiments for my high school physics class. I will need to do it on a smaller scale, so; if anyone has any ideas on how to do that, I would appreciate them.
Record turntable, 20 liter plastic bucket from restaurant supply store (Smart&Final), small camera that can cast to larger screen (GoPros are great, but I have used my phone+zoom in a pinch). higher frame rates and decent resolution help. Tripods, duct tape and other "structures" (used a plate drying rack). I'll post some of these on my channel and make them public. Good luck. Your HS sounds awesome. Feel free to reach out on anything, though I suspect your works will be even better than what I have done so far.
Also helpful: USB fans and external backup batteries with USB charging ports and more duct tape. there is a whole universe of stuff one can power with these.
Hi Ann, you might be interested in the experimental kits we have developed at diynamics.github.io. Very fun. Very accessible.
Impressive!
Intriguing Effect
Great. I dit mixing/no mixing with my students. Simple DC motor, piece of wood, power supply and we can go. Actually we started with a gramophone ;)
Lovely! You may also be interested in some of the kits we have been developing at diynamics.github.io, but they probably cant beat your DC motor. Same idea though I expect...