Ball in a funnel experiment..Bernoulli's principle and the Coanda effect

The classic Bernoulli's principle demonstration of the ball in the funnel has been a great air pressure experiment for years. The simple version has been blowing into a funnel and a ping pong ball will stay in it as long as there is blowing air. It was time to try it on a larger scale, bigger funnels, bigger balls, more powerful airstreams. The Coanda effect may also be contributing to the behavior seen in this video.

[@majortom4543]

Bruce has the right approach to learning AND Teaching. Such a great Teacher. A treasure within KZbin´s ocean or galaxy of videos.

[@Alan_Hans__]

My mind is blown by these. I am sure we covered Bernoulli's principle and maybe Coanda effect way back in high school and college but you are much better at demonstrations than I ever had. I had a couple of very good physics teachers and 1 absolute shocker. Even after studying physics for years (nearly 4 decades ago) I still get amazed.

[@Chimpster21]

No babies were hurt in the making of this video! 😊 Great video.

[@ancienttechnology7337]

You got a lot of balls doing that experiment.

[@SnarkNSass]

😂

[@thanos879]

I feel like this could be extremely useful for a very specific use case that no one has thought of yet.

[@XSpImmaLion]

en.wikipedia.org/wiki/Coand%C4%83_effect#Applications I also heard of the effect being used for robot grabbers

[@jwm6314]

0:30

[@Wrackey]

Thank you very much for this further exploration! Very interesting to see what did and didn't work. Never guessed the baby would work. Never guessed the pumpkin wouldn't work! Looks like there is more to unpack here! The half-sphere is also fascinating.

[@MatthewCreer]

Thank you very much, for this superlative and simple teaching video about a deeply fascinating topic.

[@amtracktrack4963]

Thank you for whoever is posting this! We MISS you Mr Y. Thank you for all the years of good education.

[@lightdark00]

I’m confused, do you know something I don’t? Hopefully it’s still him posting.

[@bongmuon]

I hope he is still ok! Let us know if he isn't.

[@YeanyScience]

I'm alive, well and working on more science videos to post

[@bongmuon]

@@YeanyScience Phew! Glad to hear it!

[@EfficientEnergyTransformations]

Very good demonstrations! @5:30 cutting out the center of the semi-ball is an absolutely every inventive way of experimenting, congratulation! Noted that though, the Coanda effect is clear (and in the way it is being thought of) but the Bernoulli principle is (historically, and currenlty) absolutely misunderstood ( with huge engineering implications ). Both Coanda and the misunderstood Bernoulli effect are based on the boundary layer dynamics of a moving fluid as with the increasing of the speed the boundary layer becomes more turbulent (and grows in size), and that increases its under-pressure (sucking effect), the swirls, in the turbulent boundary layer create as they try to transfer some energy to the walls of the bounding surfaces. The process generally is even more complex, as it combines Newton's 3-rd law of motions with changing of the impedance of the moving fluid, by changing the cross section it moves though, and the viscus and the inertial forces (the Reynold's number), and that creates the highly complex dynamics in boundary layer. That under-pressure sucking, only in the boundary layer, which increases with the fluid speed, is the true dynamics that creates the so called low pressure, which is misunderstood for so many years as the Bernoulli principle (that is clearly demonstrated @5:30, and this is why the presentation is very innovative!). This explanation is based on the work of Dr. Robert D. Hunt , who in 2017 publish an article on the explanation of the (misunderstood) Bernoulli principle, based on the boundary layer dynamics. Notably there were others before him ( Investigations of the asymptotic suction of the boundary layer, 2001 ) in research publications explaining the sucking effect of the boundary layer.

[@shazam6274]

Thank you for demonstrating that the Bernoulli effect cannot "lift" an airplane, regardless of how it's curved. This was clearly shown with the pumpkin and almost with the bowling ball as well. Also for proving that the Coanda effect significantly contributes to the "lift" Hopefully this proves to the Benronullidiots that it is not what lifts and airplane wing so that it flies. It is the angle of incidence (a.k.a. angle of attack) which provides >90% of the lift of an airplane wing. I put "lift" in quotes, since there is no "lift", or suction, only differential pressure; whereby the ambient air pressure pushes the objects into the funnel. 'Ol Julius Sumner Miller is smiling!

[@rogerwilson6367]

Totally agree regarding the Coanda effect and the angle of attack. I cannot for the life of me understand why people cannot understand this. If the Bernoulli effect was responsible for lift then a wing that was semi circular in cross section would cause lift.

[@shazam6274]

@@rogerwilson6367 And yet, if you search the internet for the reason airplane wings fly, including Chat GPT, you will almost always get: "Bernoulli..."

[@rogerwilson6367]

@ True and schools still teach this.

[@shazam6274]

@ I guess you have to be a perfessional edumacator to teach science.

[@YeanyScience]

Loved JSMiller , "there is no such thing as suction, no such force".

[@MariaJose-ue8rz]

Super! Thanks!

[@SnarkNSass]

Cool 😎

[@Rararawr]

The blower speeding up when holding the bowling ball is interesting. I know vacuums do that when blocked but hadn't considered the same is true for the exhaust side. But from what I just read, the impeller is basically just spinning a mass of air with it rather than pushing it, which is much easier on the motor. But in that case, its surprising it can still hold the ball with reduced airflow. As for the pumpkin, I'm assuming the air finds its way into the grooves which not only slows it down, but also means its flowing over far less surface area

[@YeanyScience]

Actually that surprises me also, when the air is blocked on the inlet, the pressure is reduced in the fan so it can spin faster, not sure what's going on when the exhaust is blocked

[@southernbreeze3278]

pupkin needs smoothing on the sides where the lift's created?

[@shazam6274]

There is no "lift", this is all due to pressure from ambient air.

[@hanfo420]

The way „Eggplant“ is specifically written on screen while apple and orange couldn’t be misinterpreted 👀

[@lothar3073]

Pumpkin grooves might be preventing it, maybe?

[@RJFerret]

This is my guess, tape over on a diagonal/spiral fashion using the pumpkin as framing and it might go.

[@shazam6274]

Its weight and the feeble fake "lift". The bowling ball almost falls for the same reason.

[@Alan_Hans__]

I think it's the mass of the pumpkin versus the fairly small area of low pressure. Having a snug fit between the funnel and pumpkin gives a higher velocity and thus a lower pressure. Once outside of the funnel and high velocity/low pressure zone the shape is fairly irrelevant.

[@realcygnus]

nifty

[@murfburffle]

you could use this to feed eggs into that other thing you made

[@ancienttechnology7337]

@@murfburffle yeah but my kids don't like them raw with the shell on.