Repeat the External and Internal Tube Flow example (example 14.7) using the Churchill/ Zajic expression for \(\overline{N u_{d}}\). How much does the outlet temperature change compared with the solution in the example?

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Example 14.7 External and Internal Tube Flow Water flows at 0.20 kg/s through a thick-walled tube. The inside diameter of the tube is 25 mm in diameter and the tube is 5 m long. The outside diameter of the tube is 35 mm and the tube mate- rial has a thermal conductivity, k = 2 W/m K. The water enters at a temperature of 25C and hot air flows across the tube at a velocity, v = 150 m/s, and a temperature, T = 250C. What is your estimate of the outlet temperature of the water?