Question

The thermal conductivity of a wire has a 4 mm diameter with 3 mm thickness is
0.11 W/
mK and the convective heat transfer coefficient between the insulating surface and
air is 25 W/m².K . Calculate the percentage of change in the heat transfer rate if the critical
radius is used.
(A) 0.45%
(B) 0.75%
(C) 0.55%
(D) 0.85%​

Answer 1

Answer:

I dont know ow any thing sorry