An inward-flow radial turbine (see Fig. P12.48) involves a nozzle angle, a1, of 60° and an inlet rotor tip speed, U1, of 3 m/s.

The ratio of rotor inlet to outlet diameters is 2.0. The absolute velocity leaving the rotor at section (2) is radial with a magnitude of 6 m/s. Determine the energy transfer per unit mass of fluid flowing through this turbine if the fluid is (a) air, (b) water.



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