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A horizontal cylindrical annular space has an outer diameter of 18 cm and an inner diameter of 10 cm. If the external surface is maintained

A horizontal cylindrical annular space has an outer diameter of 18 cm and an inner diameter of 10 cm. If the external surface is maintained at 320 K and the internal at 280 K, determine the effective conductivity of the air at 1 atm that has remained inside the tube and the convective heat transfer per unit length.

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