Nicely done! I've done a "Kaleidoscope of Milk" lab with my chemistry students (add food dyes to a Petri dish of whole milk, then touch the surface with a toothpick that has been dipped in soap) to see this effect. And now, I know what to call this phenomenon! Thanks!
yes it is. actually to the depressing of the coffee ring effect due to the marangoni flow which opposes the capillary flow and hence its effect. capillary flow forces liquid outwards forming a deeper outer parameter. but marangoni flow reverses it to whatever extend and brings back solute to centre, reducing ring effect
4:45 Dividing by scale like this is an underused method I think. In the computational physics crowd it’s more common because there it is standard to “de-dimensionalize” your problem. It’s good to see the overall trend, but it’s also important to see whether there is a dependence on scale
Hi Kieran, this is great! I happen to observe some similar effect of oil film under water droplet during electrowetting, while the oil film forms a cross-section of a cut kiwi fruit. Wondering if you'd like to give a few comments?
fascinating phenomena, I understand that water will flow outward but why in the form of small droplets? Sunflower oil and water also try to minimise the area of contact.
Hello I tried to recreate this experiment but I had some troubles. Could you tell me how you did it? The first problem I had was making the alcohol-water mixture visible (I was using isopropanol). I used basic food coloring you can find at the grocery store but for some reason you couldn't see it very well. What kind of food coloring did you use? Secondly, how did you obtain your measurements of the mother droplet? I wouldn't know how to go about it in a practical way. Thank you in advance.
Interesting you referred to it as the mother droplet and little children. This is the answer to waters above waters below as well as the membrane between mother and child. That drawing you showed looks a lot like a placenta in the uterus 😉
I cried when I hear the botched music.
This is, by far, the best video I've seen about this efect. Although, I have to confess I like the complicated sciency calculus part
Ok
Nice, I just saw Marangoni in the background of a meme.
Didn't know it's the name of this common effect.
the fanfare alone deserves views
Nicely done! I've done a "Kaleidoscope of Milk" lab with my chemistry students (add food dyes to a Petri dish of whole milk, then touch the surface with a toothpick that has been dipped in soap) to see this effect. And now, I know what to call this phenomenon! Thanks!
This video deserves more views
amazing video, i know, come 4 years late, but it really help me
This is just perfect
That was so funny! Great video
Wow, so cool! Good job :) Maybe this is connected to the physics behind the coffee ring effect too.
yes it is. actually to the depressing of the coffee ring effect due to the marangoni flow which opposes the capillary flow and hence its effect. capillary flow forces liquid outwards forming a deeper outer parameter. but marangoni flow reverses it to whatever extend and brings back solute to centre, reducing ring effect
Awesome video bro!!
4:45 Dividing by scale like this is an underused method I think. In the computational physics crowd it’s more common because there it is standard to “de-dimensionalize” your problem. It’s good to see the overall trend, but it’s also important to see whether there is a dependence on scale
That was awesome!
That was beautifully explained
That was an awesome video tnx
Hi Kieran, this is great! I happen to observe some similar effect of oil film under water droplet during electrowetting, while the oil film forms a cross-section of a cut kiwi fruit. Wondering if you'd like to give a few comments?
Nice video, thanks.
awesome!!!
fascinating phenomena, I understand that water will flow outward but why in the form of small droplets? Sunflower oil and water also try to minimise the area of contact.
Is instability related to saffman taylor instability?
nice work
1:20 Frogs!
That's what I was thinking XD
2:02 I noticed that when I take shower(water and soapy water) and now I know why.
Excellent.
The radius of droplet initially increases with time in graph? Why? We saw it decreasing with time in the experiment.
THIS WAS AWESOME
Same thing can be seen on the inside of wine glasses!
This seems like Hawking radiation
Would this also apply to a shart?
. Yeah
The ominous music
niceeeee
Hello I tried to recreate this experiment but I had some troubles. Could you tell me how you did it?
The first problem I had was making the alcohol-water mixture visible (I was using isopropanol). I used basic food coloring you can find at the grocery store but for some reason you couldn't see it very well. What kind of food coloring did you use?
Secondly, how did you obtain your measurements of the mother droplet? I wouldn't know how to go about it in a practical way.
Thank you in advance.
You can use fountain pen ink as a mix water/coloring ;)
For the diameter, I guess you can measure it on the video (measure the frame of interest).
olha onde que F 229 me trouxe...
Interesting you referred to it as the mother droplet and little children. This is the answer to waters above waters below as well as the membrane between mother and child. That drawing you showed looks a lot like a placenta in the uterus 😉
It’s abbreviated as MA(ma) 🤦♀️
The bgm is terrible