7. Consider a fully-developed fluid flow of velocity of U=5 m/s through a tube of diameter D=8 cm and of length L=10 m. The tube is subjected to a uniform surface heat flux which heats the fluid in the pipe. The inlet temperature of the incoming fluid is 27 C. At this temperature, the air thermal conductivity= 0.02551 W/m.K, kinematic viscosity= 1.56 x 10-6 m/s and Prandtl number=0.7296. The properties of water are density p=997 kg/m, thermal conductivity k=0.607 W/m K, kinematic viscosity v=8.937 x 10-7 m2 /s, and thermal diffusivity a=0.143 x 10-6 m/s. Neglect natural convection and radiation. Determine the convection heat transfer coefficient, h, for the flow of Air. b. Water. For the case of water, if the surface temperature of the pipe at the entrance is 80 C determine the heat flux. d. Determine the mean temperature of water at the end of the pipe.[Cp of water=4.18 KJ/Kg.K]. a. c