A thin pipe having outside diameter of \( 3 \mathrm{~cm} \) is to be covered with two layers of ...

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A thin pipe having outside diameter of \( 3 \mathrm{~cm} \) is to be covered with two layers of insulation each having thickness of \( 2.5 \mathrm{~cm} \). The thermal conductivity of one material is five times that of the other. Assuming that the inner and outer surface temperatures of the composite wall are fixed, find the percentage reduction in heat transfer when the better insulating material is next to the thin pipe than when it is outside.
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