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Tesla Turbine -1,354 revs PER SECOND!!!!

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Published on Jun 12, 2013

http://www.epicphysics.com/model-engi...
A small tesla turbine purchased from epicphysics.com that reached 80,000 rpm, or 1,354 revolutions per second.

Comments • 131

Rex Ford
Rex Ford3 years agoHighlighted comment
I know the answer: This turbine uses the boundary layer effect. That is like friction that the air has with the surfaces inside- you know that part already. This type of friction has two modes: static and kinetic. Just as with a brick sliding on the floor, the coefficient of friction is much higher from stationary than when the brick is already moving. Hence, once the turbine gets to a high enough speed, the coefficient of friction increases and the motor becomes nearly 100% efficient. This is an over celebrated effect though, because the motor cannot be in this efficient zone if it is actually doing something useful. That's why bladed turbines are used in real world situations.
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Tilsons Garage
V-tec kicked in yo
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Jimmy Fox
Something strange at 50k: I think you might be creating an "air bearing" at one of the friction points.
Mnemonic
its going into a Hydrodynamic Coupling at 50k RPM
underverser
Every fast rotating equipment has a critical point to pass, at this critical point, the vibrations of the rotor is very high and beyond the vibrations then disappear, beyond this point machines can suddenly jump into high speeds.... Every fast rotating machine has his own character at which speed the critical barrier lies, passing this point and the vibrations stop... I think this was the case, also because it does this every time at 50K, just like every high speed rotating equipment it has a specific value where this happens...  A Tesla Turbine is allmost 100% efficiënt, this means that it's response is 1 at 1 proportional to the airsupply, unless there is a barrier, like the critical point.... ;)
Tilsons Garage
V-tec kicked in yo
Bob
I don't think it went supersonic. According to my calculations the outside of the turbine was only travelling at about 377 km/h, or Mach 0.307 at 80,000 RPM.
Will S.
So many almost-scientists in the comments section. It's explained in considerable detail somewhere, the jump in RPM is basically because the turbine synchronizes
MazeFrame
I think that the high RPM forms a constant coneform in the turbine that makes that sound
Matt Clark
VTECH just kicked in...
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