A 25-mm-diameter, high-tension line has an electrical resistance of 10-4 Ω/m and is transmitting a current of 1000 A.
(a) If ambient air at 10°C and 5 m/s is in cross flow over the line, what is its surface temperature?
(b) If the line may be approximated as a solid copper rod, what is its centerline temperature?
(c) Generate a plot that depicts the variation of the surface temperature with air velocity for 1 ≤ V ≤ 10 m/s.