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These molecules in turn slow down the flow just above them. The molecules just above those at the surface slow down when they collide with the molecules sticking to the surface. At the same time, viscous forces cause the molecules of the fluid to resist separation. Adhesion is the tendency of dissimilar molecules to cling together due to attractive forces. ­The reason why can be found in two fundamental properties of all fluids: adhesion and viscosity. These two properties work together in the Tesla turbine to transfer energy from the fluid to the rotor or vice versa. The stator also contains one or two inlets, into which nozzles are inserted. Each end of the stator contains a bearing for the shaft. To make the turbine run, a high-pressure fluid enters the nozzles at the stator inlets. Let's take a look at the two basic parts of the turbine -- the rotor and the stator -- in greater detail. Rub or hit these sand blocks together for two distinct percussion sounds. Tesla's original design called for two inlets, which allowed the turbine to run either clockwise or counterclockwise.

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