Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is 260°C, the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is 38°C. Consider the following fluids:
(a) air,
(b) hydrogen, and
(c) water.