(50 pts) consider a 25-mm-diameter and 15-m-long smooth tube that is used for heating water. the tube wall is heated electrically to provide a constant surface heat flux alone the entire tube. water enters the tube at 50°c and exist at 150°c. if the mass flow rate is maintained at 0.01 kg/s, determine:
a. the surface heat flux
b. the convection heat transfer coefficient at the tube outlet

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?