A pump impeller has inner and outer radii of 120 mm and 280 mm, respectively; inner and outer blade widths of 30 mm and 25 mm, respectively; and inner and outer blade angles of 50◦ and 60◦ ,...

A pump impeller has inner and outer radii of 120 mm and 280 mm, respectively; inner and outer blade widths of 30 mm and 25 mm, respectively; and inner and outer blade angles of 50◦ and 60◦ , respectively. The flow rate is 250 L/s. The liquid being pumped is water at 20◦C. (a) Estimate the angular speed required for the entrance velocity to be normal to the inflow surface. (b) Estimate the power added by the pump for the angular speed calculated in part (a).