Hydrodynamic Levitation!

Hydrodynamic Levitation!

Check this out Hahaha, isn’t that awesome? That is hydrodynamic levitation Check it out! This styrofoam ball is levitating on this stream of water And it’s doing so in a very stable way. The set up it’s so stable you can play Frisbee through it Which is weird to me because the water is off to one side of the ball And that doesn’t seem to make any sense, cause you can block the water for a second and the ball will still levitate, have a look Isn’t that cool? How can it be stable like this? How can this be a stable configuration? That is what we’re gonna explain This is my friend Blake He is a toy inventor, and he actually came up with this and he brought it to me And I was like “That is awesome, there’s some really cool physics going on here.” Juggling with water. I can’t believe it will just allow you to switch balls like that. They can even hit each other as they go down It doesn’t take the other one off the stream. So how does this effect work? Well a lot of people might think of the hairdryer ping-pong ball effect. Which works basically based on Bernoulli’s principle That’s actually what we’re showing here We’ve brought this stream down so it’s going at a very low velocity So it’s pretty much laminar flow, and what you can see, if you look at the ball, is it’s entirely enclosed in water, so that water stream comes up, goes around the ball and just as with the ping-pong ball If it moves to one side of the stream it slows down the flow of fluid, and according to Bernoulli’s principle This increases the pressure relative to the faster flowing fluid on the other side So it pushes the ball back into the middle. That is what provides the stability for this ball. But I think what we’re seeing with the bigger balls is something different. This is the largest styrofoam ball I could find, so I don’t expect it to work, but hey we’re gonna give it a shot Should I go higher? Oh! It’s happening! That is incredible! Look at it dance on there man! It’s like got this instability, but it corrects. It’s incredible! You should see the way the water is spiraling off there That is awesome! So I’ve been thinking a lot about the physics that makes this possible What I think is happening is as the stream contacts the ball It pushes it up, but it also pushes the ball out, away from the stream so what I think is remarkable is that the ball actually will stay there. It is in a stable configuration and From looking at the high-speed footage what I really think is going on is this water is getting thrown over and down by the ball and since the ball is putting a force over and down on the water that water is putting a force up and in on the ball which keeps it right in that stream It’s because there’s a bit of adhesion between the water here and the styrofoam. Starts to go a little slower That pulls all that water over the ball And that’s the start of how you get the ball to spin And how you get that sprayed down on the right-hand side which provides more lift and keeps forcing the ball back into the stream Come on once the ball is levitating it remains stable because if it drifts too far into the stream that decreases the flow of water around the Ball reducing the force pushing it into the stream And if it drifts too far out that increases the water flow over the ball increasing the force pushing it back into the stream That’s what makes the equilibrium position so stable. Any slight perturbation creates a restoring force that moves the ball back to equilibrium The rotation I think is also nice because that gives it that angular momentum Providing a little bit of stability side by side, that’s not so important for these balls But it certainly is important for the disc. If you try to levitate a disc you need to keep it in the right orientation Oh, yes! Getting the discs to levitate is significantly harder than the balls because they have to maintain their vertical orientation In order for this to work. Even a slight breeze makes this very difficult HEY! Check that out! Can you come in and get it? Oh my goodness This is a clear demonstration that that is not just about the Bernoulli effect, right? It’s due to the rotation of the disc that actually carries the water over and sprays it down which pushes that back into the stream. That’s amazing Not only is this an awesome experiment it’s also pretty fun to play around with in the summer, and it was invented by my friend Blake So come over my channel Innovinci and I’ll show you how, with a simple Home Depot run, you can build this in your own backyard I’ll put a link to that video right here. So if you want to make this, go check it out

100 thoughts on “Hydrodynamic Levitation!

  1. FAQ:
    1. This is similar to the Magnus effect in that the relative motion of a spinning ball through fluid creates a force that affects its motion. It's different in that here the fluid starts the ball spinning and there is an equilibrium point around which there are restoring forces. In the Magnus effect the ball must be spinning to begin with and since the fluid is everywhere it can continually change speed and direction.
    2. It's not the Coanda effect. The Coanda effect relies on entraining fluid from the surrounding area creating a region of low pressure. Here there is no water surrounding the stream to entrain (since it is a narrow stream).
    3. Adhesion between the water and the ball is important – this is what directs the water flow over the ball.
    4. The sum of the forces I show should not be zero but equal and opposite to the weight of the ball. Hence the forces of up and out from the initial contact with the stream and up and in from the spray add to make an upward force equal to weight (the in part of the second force is much more important than the up part)
    5. It would be interesting to try this with a hydrophobic coating and see if it still works. My hypothesis is it would be much harder.
    6. Apparently there are other fountains and toys that use this principle that I was unaware of. This video uses the design created by my friend Blake.

  2. Your explanation is not accurate. Look at the explanation in this video:
    This stream has the velocity of leaving the sphere along the normal direction of the sphere, so a low pressure is generated on the surface of the sphere. When the force produced by the low pressure balances the gravity of the sphere, the sphere will float in the air. This has nothing to do with Bernoulli's theorem.

  3. I know it works with a ball being held over a tread.
    That means:
    We can modulate an magnetic flow into a stream, the module itself will float.
    But for this, it should spin freely over the horizontal axis like ufos.
    If we spin a magnetic field it goes horizontally.
    If the weight of some structure is spherical right on side of such spinning magnetic high voltage, it will loose its weight.
    The high voltage can be generated into the disk itself using a build in vinil tape on the center of the donut ring of the structure under a fixed cooper brush on each side.
    All hold by a spherical weight on outside. that holds the disk in center spinning by a light weight structure or wire.

  4. Fascinating video thanks!!
    For those that are interested in real levitation or flight without mechanical moving parts, if you click on my purple channel icon to the left, you can see an ion propelled craft lifting its power supply against gravity! It is the only one that can pick up its onboard power supply so far…

  5. Watching that large disk spinning it doesn't seem that the reaction of the water thrown away by spinning has much of an effect. This is more like a reversed Magnus effect .

  6. Wait? Can't this visualize how atoms reflect light and keep electrons from crashing into the nucleus?

  7. what is the term used when lights affect the way we see how water moves like when lights are strobing or flickering very fast that it makes the water seem to flow backward or upwards when its actually moving in the other direction, can you explain that?

  8. It's a simple form if kinetic energy transferred

    Spinning arms is what gives it the momentum for spin what you create a centrifugal force that's been balanced by the pressure of the water

    Interesting observation that now you can look at the universe completely different

  9. this dudes smart but hes also forgetting that gravity is also part of this. the ball is constantly being pulled downward by gravity, it not just cuz the ball is exerting force from the opposite side

  10. Legends say that If you say Laminar's Flow 3 times in a row in your YouTube video Destin from SmarterEveryDay will appear.

  11. I thought It was caused by the ball creating a gyroscope effect that made the forces in other directions cancel out and making it more stable while spinning allowing the water stream to counteract the only force that could stop it, gravity. i dont have any fancy degrees in physics or anything so I'm sure Derek's is more accurate than my hypothesis but that's what I thought first. The disc doesnt even appear to be sending enough water away to keep the disc in the stream according to Derek's reasoning.

  12. I think it is more related to the inertia of the water for going up, then meeting with the ball, and "sticking to it" (porous surface) then pulling it up from the top side via de surface tension of the water

    It would be nice to see if this works with things that have higher surface tension (I don't know.. goo ?) and maybe lower ones (ethyl alcohol maybe?)

  13. Fake, there's no way this could happen…. think of it as a round clock, the water hitting between the 4:30–5:30 area….the ball would be pushed to the side, there's no flow of water circulating around the ball to keep it in place before the water actually hits it

  14. I think the adhesion isn’t a good enough explanation, since most of the water is thrown off the ball before it is directed downwards and towards the stream.

    I think that since where the ball and stream meet there is lower than atmospheric pressure, the air around the stream and ball push on them.

    As a result, the stream sticks to the ball, and the ball moves towards the stream. It is this atmospheric pressure which balances the the force exerted on the ball by the stream.

  15. Dude…why are you wasting water? For explaining something which doesn't have any significant practical application. You could've simply animated it.

  16. I suspect that Coanda effect is the best explanation. Put a finger under a running stream from a kitchen faucet. Start from one side and move toward the center of the stream. Your finger will be pulled into the stream.

  17. This is how gravity work

    1 – think of space as a fluid

    The mass of the earth dispersed space….

    Space compresses on earth…

    That's how gravity works, it is a push

  18. If you had water falling down on the other side of the ball at the same time, would the ball stay in the middle, rise or fall?

  19. I think it's doing that because it is constantly in a backspin and then the jet of water is pushing it away but providing momentum and then the backspin is pulling it in towards the water but the water is providing forward spin and pushing it away. Do its basically a constant flow of up and over AND down and under all at the same time

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