The Coanda Effect

A simple experiment using (i) running water from a tap, and (ii) air blown through a straw, as it flows over the back of a vertically hanging plastic teaspoon are used to demonstrate the Coanda effect. Here the attachment of the back of the teaspoon to the flowing stream of fluid (air or water in this case) is what is referred to as the Coanda effect.

[@sandyjpatil]

Simple and straight forward way to explain the effect. Beautifully done…Great job, keep it up.

[@thehistoryofchingfordwater8933]

Amazing. Best coanda video I've seen thanks.

[@bluecoin6594]

I m impressed that the author explained Coanda effect through some basic stuffs. As a pilot, I learned the reason why lift generate.

[@Hard_Online]

This is a perfect definition of perfect👍🏽

[@darkstriker00]

Fascinating, the more water he pours the less that falls in the sink.

[@filmefranceze287]

For those who don´t know , Henri Coandă was a Romanian inventor and aerodynamics pioneer.

[@kkrobertson1]

Excellent demonstration! I guess some folks don't understand that both air and water has mass and acts similar in certain situations. Coanda is one of these situations.

[@skytical]

Fantatic display of Bernoulli's priciple & its effects. Coanda's effect is merely a by-product of the lower pressure within a fluid due to it being accelerated as per Bernoulli. The fluid tends to stick to the surface of the convex shape (spoon, aerofoil etc) due to the slightly higher pressure of the fluid adjecent the parcel of fluid being accelerated pushing on it! In this case accelerated fluid is water and adjacent fluid is air. Brilliant experiment shows how 2 fluids work as 1

[@jorgebadad]

Great demo Coanda effect!!

[@tilakvyas2700]

This is actually surface tension. The Coanda effect can be seen if you place a candle behind a bottle and blow on the top of the bottle. the candle will blow out facing towards the bottle. this is the true coanda effect

[@Direkin]

Yes, I thought this was more of a demonstration of surface tension as well.

[@dplop123]

Yeah but he blew on it two.coanda..

[@PointyGorman]

Surface tension of what? Laminar flows?

[@yjlee8209]

I agree ... this is just because of the surface tension

[@StrsAmbrg]

This is another demonstration as you mentioned, candle behind a bottle. kzbin.info/www/bejne/hKfdiX6Qg69qkLc But however, demonstration with the tap shows how the coanda's effect to a lift force as the water flown more and more, until it reach its maximum effect.

[@_HyurGarage]

thank you : ) what a simple and clearly experiment to understand coanda effect!

[@lightbodyification]

Awesome vid, explains such simple effects of Coanda.

[@richardfireone]

exactly. Lift is not pressure related, it is electromagnetic.The speed needed to go in a straight line and the g forces on the electrons shell are in balance with the local gravity however when they are forced to curve the exertion of g forces increases, deforming the electron shell and expanding into a gravity vacuum is composed of oppositely charged particles. This electrical gravity polarity effect occurs on any and all surfaces interacting in this way. "Viktor Schauberger"

[@ThomasGrillo]

Thanks for the Coanda effect demo. This is fascinating stuff.

[@MechTechSimulations]

Superb experiment!

[@krugertiaantk]

GREAT experiment ! Thanks !

[@brunobl2007]

The problem with the tap water experiment of the video is that it is done with two very different fluids (water/air). In true Coanda effect, both the jet and the fluid around it should be the gasses or liquids (air/air, water/water, etc). If the same experiment were done underwater with a submerged hose directing the flow over the teaspoon, it would have properly demonstrated the effect.

[@-Sean_]

That's some nice laminar flow

[@Khether0001]

oh, got it when you blow the spoon from above... its probably the same effect you get in the wing of an airplane, difference in pressure on the more concave surface due to the exrtra time it takes for any "fluid" (water/air) to pass over it makes it pull that way... or something like that... cool video!

[@ferithss]

nicely done experiment! I commend your scientific method!

[@ronesjunior5450]

Due the fact about the velocity of the stream on the out surface of the spoon. For Bernoulli, increases velocity and hence pressure decreases and drawing the spoon.

[@fragglepuppies]

Man, that's great. Thanks for posting.

[@pcdsgh]

when Henri Coandă created the first jet powered airplane, he saw how the flames attatched to the wooden body of the plane. it's essential to take this effect into consideration when building aircraft (+, the effect is used by airplanes' wings). that's why it's called the Coandă effect.

[@redpunk]

@WaroWari it's not attracted to the water. it's being held by surface tension

[@Danny4X]

The reason this happened because when the air/water is pushing downward against the spoon the pressure creates low pressure so the other side of the spoon has high pressure so the high pressure pushes the spoon inward causing this effect.

[@TulipXX]

I always suspected this was an intricate part of the respiration of giraffes.

[@markmalkin5224]

Mr. O'Flynn's class: You have come to the right video.

[@ironXnub]

its almost like an aeroplane wing. as the water passes over the spoon surface tension causes the water to curve around the spoon and flow off the end. as the water flows off the end it is flowing at an angle and due to newtons 3rd law ( for every action there is an equal and opposite) it forces the spoon further into the stream.

[@shortclips7052]

This is due to natural viscosity and stickness in the air and water....

[@sachinjade2737]

Thank you.

[@final0915]

nope, this is not coanda effect, instead its caused by the surface tension, when water moves in the direction of the spoon's tip afterwards can be seen as coanda effect

[@RelatedGiraffe]

Surface tension has nothing to do with this, and this is indeed the Coandă effect. You say that the water moving in the direction of the spoon's tip can be seen as the Coandă effect, and that is also exactly what it is. But the force that is pulling the water along the back of the spoon is also giving rise to an equally large but opposed force on the spoon (Newton's third law of motion), therefore it is the Coandă effect that is responsible both for the change in direction of the water and of the pulling of the spoon.

[@Naton]

Bernoulli's Principle! - running fluid in a venturi causes Pressure drops. in this case, the curve side of the spoon generates low pressure. vice versa

[@davidhollfelder9940]

A variation of Bernoulli’s principle .. the same effect of the airplane wing .. and Venturi/carburetor

[@StrsAmbrg]

What about the idea saying that it is not either Bernouli nor Coanda's effect. It is isolated stream of water due to hydrophilic properties. See it in here in 2:33. kzbin.info/www/bejne/bIKbeaapprx3eqc

[@hardware199]

2:40 Venturi effect

[@rudolphdandelion6840]

lmao

[@mrhatman675]

Sorry it s called bernooli effect that s the sheintist that first described the phenomenon and thats the sheintist that the phenomenon is going to be named after thats how it works

[@lucky997]

Thanks,nice work

[@albertogianfranceschi9421]

Hi everyone, I'm Alberto da Massa, I express myself on this interesting video: is a physics experiment already demonstrated by Bernoulli's theorem that explains the lift of an airplane wing for example, or a sail windsurfing, or hang gliding etc. , The effect is generated when a fluid (air or water) hit an object from the wing profile: the difference of speed of water fluid which meets the spoon (in this video) between the external part and the internal causes which generate a pushing the bowl of the spoon attraendolo toward the water jet. Best regards. Salve a tutti, sono Alberto da Massa, mi esprimo su questo video interessante : è un esperimento di fisica già dimostrato dal teorema di Bernoulli che spiega la portanza per esempio dell'ala di un aereo, o di una vela del windsurf , o di un deltaplano ecc. , l'effetto si genera quando un fluido ( aria o acqua ) colpiscono un oggetto dal profilo alare: la differenza di velocità del fluido acqua che incontra il cucchiaio ( in questo video ) tra la parte esterna e quella interna fa si che si generi una spinta nella parte concava del cucchiaio attraendolo verso il getto d'acqua. Cordiali saluti.

[@erikt81a]

loud and clear!

[@anentpsguidetothegalaxy9132]

Nice!

[@jojolafrite90]

It's magnetism. I don't remember why but water is magnetized as it flows out of a tube.

[@Kimariesings]

Correct, though it is "due" not "do".

[@JoeBorg1]

The blowing on the spoon with a straw is just causing a low pressure which is sucking the spoon towards you

[@hugohugo990]

DAMN SCIENCE! YOU SCARY!

[@ya90375]

維基百科上說，第一個吸附湯匙的實驗，其實是表面張力。 by Wikipedia , 1st water test, major force is Surface Tension, not Coanda Effect

[@CountAdrianEJ]

thanks!

[@hasnder]

isn't this like the effect that keeps airplanes in the air? the air/water at the flat side of the spoon has to travel a bigger distance==>higher speed==> lower pressure than at the other side==> the not-flat side presses the spoon against the water? it was something like that but I can't remember exactly :P

[@criscros7]

"surely thats just to do with water surface tension" It's actually quite a bit more complicated. Read Wikipedia's article on the Coanda effect (both the English and German versions are good).

[@FCEdward]

These are moments in which I am proud to be Romanian.

[@FAISALGHASWALA]

How can we define COANDA effect in simplest words??

[@helicepalhares]

Spoon water drain

[@EG-cs3wv]

A fluid that is mooving over a surface in the same direction creates less pressure than that fluid in a static state

[@younglaw929]

Mum: you are wasting water!

[@Lifehouserocks95]

awesome

[@dlwatib]

With the air there is no question that it is the true Coanda effect.

[@therealblackmonolith]

Thanks science people!!

[@life33mahmod]

Thank You :)

[@Faust333]

there is an spoon,this is one of the principles that rule the reality in what YOU probably believe.

[@bopper989]

is this not just bernouilles principle, which is the explanation of lift?

[@bensonak47]

i like your sink

[@remja89]

The deflection of the spoon does not explain Coanda Effect. However, the behavior of the water flow curving towards the left is a good example of the Coanda Effect. The deflection of the spoon is a result of differential pressure (Bernoulli's Principle - Aerodynamic Lift).

[@zmeura87]

@freytheviking yep, but iti seems that it is not the best example:). Did you know that Herni Coanda was Romanian? ;)

[@archaedemos]

seems like the same effect as when a ping-pong ball is blown in a stasis above ones head.

[@jedus1]

I think my sister had Coanda. She met this guy at a club and took him home and made love. And he left right before she woke up. Two weeks later she was diagnosed with Coanda and now cant have childrens.

[@giorkatso]

@SpeakingSerpent I'm sorry I didn't see the straw experiment.

[@loriziell]

u know Coanda was a romanian

[@anltube35935]

Why this is not surface tension ?

[@Aranx2o]

Lol his sink got all wet after the POWER POUR!

[@hailtheempire]

Could someone try this experiment with two streams of water/fluid and a single object with two concave surfaces( unlike a spoon which has one concave and one convex) in the middle? I wonder what would determine (convexity or something) which way the object will move i.e. to the left stream or the right stream.

[@KoaBosk]

Wiki is not a reputable source for information. Coanda effect "phenomenon in hydrodynamics whereby a fluid in motion may be attracted or held to a wall" (Egan 1346) Egan's Fundamentals of Respiratory Care 10th Edition Robert M Kacmarek, James K Stoller, Albert J. Heuer

[@freytheviking]

Seems like this is what they are doing with the McLaren MP4-27 Formula One racer this year!

[@ZEDUser]

...where can I buy those tiles.

[@54spiritedwill54]

Sweet stuff. I bet your counter was pretty wet afterwards, though

[@dplop123]

Awsome

[@masso172]

Isnt this Bernoulli instead?

[@Prominence64]

el video es bueno pero no valoras la importancia del agua

[@nafshalabi]

how does this differ to the Magnus Effect?

[@TheCuriousSeb]

This reminds me of how aerofoils work.

[@ikarosfrangos3957]

coanda coanda very good very good

[@dw-rh6fb]

Think of air as water and the spoon as an airplane wing, we have flight!

[@737driver]

Exactly what I thought when he blowed through the straw!

[@Flamingpiano]

COOL

[@IbrahimKhan-ll1no]

Wow 14 years😲😳😳😳

[@ollieoniel]

clever

[@peanuts2105]

Welcome to the world of Formula 1 undertray

[@user-jp8zq3zk8b]

Looks like the same effect as how a venture works in a carburettor.

[@VictorDiaz97]

this is not the coanda effect

[@ronesjunior5450]

Yes, this is of 100% sure!!!

[@freshANDhesh]

neat

[@jddh1]

Hope you cleaned up that water spilling out to the kitchen counter. :P

[@Nereus00]

that's the same I thought before reading wiki ahah He should repeat the experiment using something waterproof..

[@alpop850]

it hurts my mind!!

[@stanstuben2961]

Seems like a lot of science just to wash a spoon on one side

[@jarkanciofan]

Is the same thing with air. :D

[@slateflash]

in your materials list u forgot : lotsa water

[@TeraVoltLabs]

i thought this was Bernoulli's principal?

[@DrMattB]

That's the popular misconception.

[@hubu72]

yea, that's exactly what i was thinking...

[@sylvbiologist]

easy nmn e explain toh,,, the greater the speed of the fliud(water or gas) the lesser the pressure! am i ryt?

[@youssefbenmoussa6050]

I came from Lahjomri's course anybody else?

[@AzoreanProud]

Yes, but can't explain everything, but some people believe that explains everything, and create dogmas and reticulated anything that can't be explained...

[@BookProX]

Bernoulli’s principle has to do with liquid flow pressure differential in tubes. Coandă effect is the aerodynamics effect of an object due to its shape. His effect has been applied successfully in aeronautics for quite some time and, everywhere where in need for better aerodynamics design. For example, the wing of airplanes and propellers are designed and built to have some degree of dome like shape for a better lift.

[@FleshyPink]

The coanda effect is the fluid dynamics* not necessarily aerodynamics. Since gas is practically the same as a fluid in flow, it can then be used in the field of aerodynamics however.

[@BookProX]

Fleshy Pink Back then he realized is going to be tough to visualize and prove the effect using compressed air. So, he choose tap water for the audience to see how the jet acts on the surface of the spoon.

[@montruo000000007]

was it a comment on a gag of a glass of milk by any chance? :p

[@Boekoe12]

My school brought me here lol

[@danrees100]

@freytheviking, that exactly how I came here!

[@SmoochieRoo]

do remember that the site is not to be fully trusted... but it does'nt matter really.

[@GQube3]

A nappy pin? O__o

[@rbowen47]

this is surface tension, not the coanda effect

[@templarseries]

@usernameunave0 Well said !