Blood flows at 0.0065 kg/s through an artery of diameter 8 mm and length 350 mm. it enters the artery at 36.5°c and leaves it at 34.0°c. calculate the rate of heat transfer from the blood, the mean heat flux through the artery wall, and the mean velocity of the blood. (note: the thermophyhsical properties of blood may be approximated by properties of liquid water at 37°c.)

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.