The internal and external diameter of the impeller of a centrifugal pump are 200 mm and 400 mm respectively. The pump is running at 1200 rpm. Find the velocity of flow if the vane angle at inlet 20°.
Given tan 20° = 0.363
1
7.42 m/s
2
3.34 m/s
3
4.57 m/s
4
6.67 m/s