Water flows at a rate of 7 m^3/s in a circular sewer 1.6 meters in diameter. The slope of the sewer is 0.01.
(a) Calculate the depth of flow and velocity in the sewer, assuming normal flow.
(b) Determine the diameter of pipe required for the discharge to be carried at 3/4 full.

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.