Question

Consider two long, slender, rods of the same diameter but different materials. One end of each rod is attached to the base surface maintained at 100 ^oC, while the surfaces of the rods are exposed to ambient air at 20 ^oC. By traversing the length of eacg rod with a thermocouple, it was observed that the temperatures of the rods were equal at the positions x_A = 0.15 m and x_B = 0.075 m, where x is measured from the base surface. If the thermal conductivity of rod A is known to be K_A = 70 W/ m*K, determine the value of K_B for rod B. The two rods can be considered as infinite long fins with steady-state heat transfer.

Answer 1