Question

4K
air at 25°c
- A copper sphere weighing 3 kg is heated in a furnace to a temp of
c
taken out and allowed to cool in ambient
• If it takes 60 min for the copper sphere to cool
down to 35"c. what is the average surface that transfer coefficient
Take density of copper sphere = 8950 kg
!
imy and Sp. heat ep= 0.383
K] / kg'c.
state the aesumption made and derive the relation used.​

Answer 1

Answer:

please follow ☺ ♥ ☺

Answer 2

Answer:45.6834w/m2k

Explanation:

Assumed lumped heat analysis is valid