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Mechanical Engineering · Q99

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 99

Q99

The critical thickness of insulation for a sphere is

A.
k/h0
B.
2k/h0
Answer
C.
h0/k
D.
h0/2k

Answer: Option B

Solution

Answer: Option B
Solution:
Critical thickness of insulation means maximum heat loss with min thermal resistance. This concept is useful in the situation when surface area of the base object increases with the insulation.
The critical thickness of insulation for a sphere is 2k/h0.
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