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The critical thickness of insulation for a sphere is

This question belongs to Mechanical Engineering Heat And Mass Transfer
Heat and Mass Transfer
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The critical thickness of insulation for a sphere is

Answer & Solution
Correct Answer: Option B
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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