The impeller on the radial flow pump has an average inlet radius of 5 cm and outlet radius of 15 cm and an average width of 3 cm. If the blade angles are 20o and 10o at inlet and outlet respectively, determine the flow through the pump, the ideal pump head when the impeller is rotating at 360 rpm. The flow onto the impeller is in the radial direction.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.