An inward flow radial turbine (see Fig. P5.55) involves a nozzle angle, a1, of 60° and a...

An inward flow radial turbine (see Fig. P5.55) involves a nozzle angle, a₁, of 60° and an inlet rotor tip speed, U₁, of 6 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 12 m/s. Determine the energy transfer per unit of mass of fluid flowing through this turbine if the fluid is (a) air or (b) water.