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.