If a similar set of disks and housing with an involute shape (versus circular for the turbine) are used, the device can be used as a pump. The important point of this Tesla turbine invention is that the turbine does not use friction in the conventional sense; rather it avoids it, and uses adhesion (the Coandă effect) and viscosity instead. It utilizes the boundary layer effect on the disc blades. Tesla turbine comprises of a multiple-disk rotor contained in a housing provided with nozzles to supply high-speed moving fluid that is nearly tangential to the rotor. The fluid flows spirally inward and finally exhausts from the rotor through holes or slots in the disks near the shaft as shown in Figure 1.