Answer Happy

3- Circular cooling fins of diameter D=1 mm and length L-25.4 mm, made of copper (k=400 W/m.K), are used to enhance heat transfer from a surface that is maintained at temperature T-132 "C. Each rod has one end attached to this surface (x=0), while the opposite end (x=L) is joined to a second surface, which is maintained at T₁2-0 °C. The air flowing between the surfaces and the rod is at T-=0 °C, and the convection coefficient is h= 100 W/m².K. (fin with prescribed temperature) A) Express the function e(x)= T(x) - T along the fin, and calculate the temperature at x=L/2. B) Determine the rate of heat transfer from the hot surface through each fin and the fin effectiveness. C) What is the total heat transfer rate from a 10-cm by 10-cm section of the wall, which has 625 uniformly distributed fins? Assume the same convection coefficient for the fin and for the unfinned wall surface. TA RE OBE T..h Ta