As disks commence to rotate and their speed increases, fluid now travels in longer spiral paths because of larger centrifugal force. Fluid used can be steam or a mixed fluid (products of combustion). Through this phenomenon, some of the fluid energy is converted to mechanical work, causing the disks and shaft to rotate. Openings are cut out at the central portion of the discs and these communicate directly with exhaust ports formed in the side of the casing. In a pump, centrifugal force assists in expulsion of fluid. On the contrary, in a turbine centrifugal force opposes fluid flow that moves towards centre