1. A long, circular aluminum rod is attached at one end to a heated wall and transfers heat by convection to a cold fluid.
(a) If the diameter of the rod is tripled, by how much would the rate of heat removal change?
(b) If a copper rod of the same diameter is used in place of the aluminum, by how much would the rate of heat removal change?
2. A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200°C. The rod temperature.
is in an air environment with Too = 20°C and h = 30
3. Consider an extended surface of rectangular cross sec- tion with heat flow in the longitudinal direction. W/m2 · K. What is the temperature of the rod 25, 50, and 100 mm from the casting?