User:Cjcampo/ENES 100/Bernoulli (or Coanda) effect

Problem
The goal is to develop a demo of the Bernoulli effect that distinguishes it from the Coanda effect (or vice versa).

The Bernoulli effect is responsible for a remarkable number of counter-intuitive demonstrations. EXAMPLES:
 * Blowing on a curved piece of paper horizontally causes it to lift up
 * A stream of falling water pulls a spoon up
 * Blowing between two soda bottles suspended from the ceiling will cause them to get closer not further apart

The Bernoulli effect is the phenomenon when a current passes over a curved surface. The current will increase in velocity, which causes a lower pressure area. This causes the curved surface to be pulled towards the current

The Coanda effect is the phenomenon when a current passes over a curved surface as well. It is the tendency of the current to follow the curve of the surface beyond the surface.

Bernoulli aircraft look exactly like flying saucers. The effect is used to eliminate the common helicopter tail rotor. The Coanda effect is often confused with the Bernoulli effect. Through vortices, the Bernoulli and Coanda effects provide a majority of the lift used to sustain subsonic flight.


 * Coanda Blowing between soda bottles
 * Coanda Paper Blowing
 * Coanda Water Pulling Spoon
 * Coanda UFO
 * Coanda Helicopter Tail Model Look for an example of a helicopter dragging its tail in water!

Conceive
There were a few ideas that were conceived, and the final two final ideas were a self flowing flask and a wind tunnel. The self flowing flask was chosen as the source of a current.

A few things that the self flowing flask idea would do
 * Create a continuous flow of liquid
 * Have a mechanism to change the demonstration between the two effects
 * Have a spoon to show the demonstration of the two effects

Design
A stand was designed to hold the mechanism and to hold the self flowing flask

Implement
A prototype of the stand was created and a spoon was taped so that it hung down and could swing out in the direction of the arms. The spoon could be switched between demonstrations by letting it hang for the Bernoulli effect and by resting on a band wrapped around the arms for the Coanda effect.

Next Steps

 * Get familiar with existing demo setup
 * Brainstorm alternative configurations