Chapter 8, Problem 8.35P

Water flowing at $\text{2 kg}/\text{s}$ through a $\text{4}0-\text{mm}$ diameter tube is to be heated from 25 to $\text{75}°\text{C}$ by maintaining the tube surface temperature at $\text{l}00°\text{C}$ .

(a) What is the required tube length for these conditions?

(b) To design a water healing system. WC Wish to consider using tube diameters in the range from 30 to 50 mm. What are the required tube lengths for water flow rates of 1, 2, and $\text{3 kg}/\text{s}$ ? Represent this design information graphically.

(c) Plot the pressure gradient as a function of tube diameter for the three flow rates. Assume the tube wall is smooth.