What is shown here, is, to my best knowledge, *not* Taylor-Couette flow, but highly laminar flow. The laminae (layers) are exactly what preserve the the three colours. In fact, the same video is shown elsewhere on youtube as a demonstration of laminar flow. Taylor-Couette flow would entail toroidal (doughnut-shaped) micro-flow, and I doubt that this would ever return the three drops of dye to their original positions, because the laminae would now inter-mix. However, I'd gladly stand corrected if you can show me some supporting information. Either way,it's a totally cool video! I just wanted to point out what I think is incorrect terminology.
+Mark Rohwer This is actually Taylor-Couette flow, but importantly: the flow is slow enough that it's below the critical Taylor number, which depends on the square of the Reynolds number and the ratio of the inner to the outer cylinder radius. There is a good discussion here: www.scholarpedia.org/article/Taylor-Couette_flow
+Åsmund Ervik Well, the article you've linked, actually confirms that what is shown here, is not Taylor-Couette flow, but (cylindrical) Couette flow, i.e. laminar flow. In the very first paragraph of the article, we read that Taylor-Couette flow occurs *above* a critical rotational speed, when instability leads to the toroidal vortices. In fact, these vortices are called Taylor vortices. A bit further down, it is confirmed that the laminar flow at low rotational speeds is termed "cylindrical Couette flow". No Taylor. So, to come back to this video: The ink spots are not preserved because of Taylor-Couette flow. To the contrary. If there were any Taylor vortices, I am pretty sure the ink spots would be mixed irreversibly.
This was amazing! I never saw any description of this taylor couette characteristic before. How do you explain what happened? Im trying to found some material to guide me in chemical reactor based on taylor couette flow, could you indicate me a good source? See you.
I would love to see this for myself. Could you please list material used, especially the mixer? is it hand built if so how many parts is it, I dont think just an inner cylinder rotating in a bowl? What could be an alternate if mixer was custom built in lab? Is the dyed corn syrup added to water or is the main fluid some other mixture/viscosity other than water?
What is shown here, is, to my best knowledge, *not* Taylor-Couette flow, but highly laminar flow. The laminae (layers) are exactly what preserve the the three colours. In fact, the same video is shown elsewhere on youtube as a demonstration of laminar flow. Taylor-Couette flow would entail toroidal (doughnut-shaped) micro-flow, and I doubt that this would ever return the three drops of dye to their original positions, because the laminae would now inter-mix. However, I'd gladly stand corrected if you can show me some supporting information.
Either way,it's a totally cool video! I just wanted to point out what I think is incorrect terminology.
+Mark Rohwer This is actually Taylor-Couette flow, but importantly: the flow is slow enough that it's below the critical Taylor number, which depends on the square of the Reynolds number and the ratio of the inner to the outer cylinder radius. There is a good discussion here: www.scholarpedia.org/article/Taylor-Couette_flow
+Åsmund Ervik Well, the article you've linked, actually confirms that what is shown here, is not Taylor-Couette flow, but (cylindrical) Couette flow, i.e. laminar flow.
In the very first paragraph of the article, we read that Taylor-Couette flow occurs *above* a critical rotational speed, when instability leads to the toroidal vortices. In fact, these vortices are called Taylor vortices.
A bit further down, it is confirmed that the laminar flow at low rotational speeds is termed "cylindrical Couette flow". No Taylor.
So, to come back to this video: The ink spots are not preserved because of Taylor-Couette flow. To the contrary. If there were any Taylor vortices, I am pretty sure the ink spots would be mixed irreversibly.
+Mark Rohwer OK, I agree "cylindrical Couette flow" is a better term.
+Åsmund Ervik Thanks for the feedback, I appreciate it!
The most important thing in physics that is understand a motion of matter
This was amazing! I never saw any description of this taylor couette characteristic before. How do you explain what happened? Im trying to found some material to guide me in chemical reactor based on taylor couette flow, could you indicate me a good source?
See you.
Are you serious!? Amazing!
Holly shit i said! It was just like magic
Hi! Where can I get this mechanism ?
what demonic trickery is this??? :-)
AMAZING
I would love to see this for myself. Could you please list material used, especially the mixer? is it hand built if so how many parts is it, I dont think just an inner cylinder rotating in a bowl? What could be an alternate if mixer was custom built in lab? Is the dyed corn syrup added to water or is the main fluid some other mixture/viscosity other than water?
sciencedemonstrations.fas.harvard.edu/presentations/reversible-fluid-mixing
Perfect
OMG AMAZING!!!
Speechless..... :0
En que dirección se mueve el líquido?
wow very cool
Magic
Interesting
time
machine
huh? what kind of sorcery is this?!
hwat...
It's like photoshopping back and forth.
enim :')
mou3anet
ensmr ?
stop