Water enters a centrifugal pump with an absolute velocity \(V_{1}=10 \mathrm{~m} / \mathrm{s}\) in the radial direction and leaves with an absolute velocity \(V_{2}\), which makes an angle of \(\theta_{2}=60^{\circ}\) with the radial direction, as shown in Fig. P12.8. The impeller width (perpendicular to the paper) is \(b=0.125 \mathrm{~m}, R_{1}=0.125 \mathrm{~m}\), and \(R_{2}=0.35 \mathrm{~m}\). Find the input torque \(\mathscr{T}\) required to drive the pump if there are no friction losses.

Figure P12.8

Transcribed Image Text:

V2 02 5,00 R R Impeller