a) Assuming that the tube is straight, calculate and compare the predictions of the analogies of

Chilton-Colburn and Yu et al. for heat transfer coefficient, and compare them with the predictions

of the empirical correlation of Gnielinski. Discuss the results.

b) Assume that the tube is a vertically-oriented helically coiled with a coil radius of 15 cm and a

pitch of 4 cm. Calculate the heat transfer coefficient using an appropriate correlation.

c) Repeat part (b), this time using the correlation of Gnielinski along with a friction factor that is

found from an appropriate correlation for the helicoidally coiled tube./nPROBLEM 3

Problem 9.12 Water at a mean temperature of 300 K flows in a long heated hydraulically smooth pipe

with a Reynolds number of 2.5 x 104. The tube inner diameter is 4 cm.