An iron (k= 65 W/m K) billet measuring 20x15x80 cm is exposed to a convective flow resulting in convection coefficient h= 11.5 W/m2 K. Determine the Biot number and the suitability of a lumped analysis to epresent the cooling rate if the billet is initially hotter than the environment.
Answers
Answered by
5
Answer: c
Explanation: Biot number = h l/k = 0.48.
meenaramdyal1:
l=20×15×80/2(20×15+15×80+80×20)
l=0.0423m
Similar questions