I know that this is not a new idea, but I marvel at it's simplicity. The Tesla turbine is a bladeless centripetal flow turbine patented by Nikola Tesla in 1913. It consists of a series of thin disks attached to a shaft. The shaft spins smoothly when either gas, air or liquid is passed over the surface of the discs. It is unique in being a reversible turbine and a reversible pump, and is becoming more common for use in off-the-grid power systems.
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