Coandă effect movies

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Demonstration animation of the

Demo 1

Animation loop: 1) Only water running. 2) The convex object brought close to the waterstream. 3) The "Venturi effect" creating a pressure decrease in the air between and thus bringing the stream towards the object. 4) The "Coanda effect" taking over.

Demo 2

Coanda effect as demonstrated with a spoon and a water stream.

If one holds the back of a spoon in the edge of a stream of water running freely out of a tap (faucet), the stream of water will deflect from the vertical in order to run over the back of the spoon. This is the Coandă effect in action.

This demonstration is the combination of the Venturi effect and the Coandă effect. The Venturi effect would cause a drop in pressure between the spoon and the stream of water, which would then be drawn towards the spoon. Once the surface of the stream hits the spoon, the Coandă effect keeps it running over the convex surface.

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